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Radreview technical factors 281
front 1 Focal-spot blur is greatest
| back 1 B.
|
front 2 Accurate operation of the AEC device depends on
| back 2 D.
|
front 3 An x-ray exposure of a particular part is made and restricted to a 14 x 17 in. field size. The same exposure is repeated, but the x-ray beam is restricted to a 4 x 4 in. field. Compared with the first image, the second image will demonstrate
| back 3 B.
|
front 4 If a particular grid has lead strips 0.40 mm thick, 4.0 mm high, and 0.25 mm apart, what is its grid ratio?
| back 4 D.
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front 5 An exposure was made at 40-in. SID using 5 mAs and 105 kVp with an 8:1 grid. In an effort to improve radiographic contrast, the image is repeated using a 12:1 grid and 90 kVp. Which of the following exposure times will be most appropriate, using 400 mA, to maintain the original density?
| back 5 B.
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front 6 Compared with slow-speed screens, high-speed screens are often used to
| back 6 B.
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front 7 Which of the following technical changes would best serve to remedy the effect of very dissimilar tissue densities?
| back 7 C.
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front 8 Tree-like branching black marks on a radiograph are usually the result of
| back 8 D.
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front 9 Recorded detail depends on all the following except
| back 9 A.
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front 10 The exposure factors of 300 mA, 0.017 second, and 72 kVp produce an mAs value of
| back 10 A.
|
front 11 In which of the following examinations would a cassette front with
very low absorption properties be especially desirable? | back 11 C. |
front 12 An exposure was made at a 36-in. SID using 300 mA, a 30-ms exposure, and 80 kV with a 400-speed film–screen combination and an 8:1 grid. It is desired to repeat the radiograph and, in order to improve recorded detail, to use a 40-in. SID and a 200-speed film–screen combination. With all other factors remaining constant, what exposure time will be required to maintain the original radiographic density?
| back 12 B.
|
front 13 Involuntary motion can be caused by
| back 13 D.
|
front 14 A satisfactory radiograph was made using a 36-in. SID, 12 mAs, and a 12:1 grid. If the examination will be repeated at a distance of 42 in. and using a 5:1 grid, what should be the new milliampere-seconds value to maintain the original density?
| back 14 B.
|
front 15 A satisfactory radiograph was made using a 40-inch SID, 10 mAs, and a 12:1 grid. If the examination will be repeated at a distance of 48 inches and using an 8:1 grid, what should be the new mAs to maintain the original density?
| back 15 C.
|
front 16 If a 6-in. OID is introduced during a particular radiographic examination, what change in SID will be necessary to overcome objectionable magnification?
| back 16 D.
|
front 17 Angulation of the central ray may be required
| back 17 D.
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front 18 Types of moving grid mechanisms include
| back 18 B.
|
front 19 What is the best way to reduce magnification distortion?
| back 19 C.
|
front 20 The factors that control recorded detail include
| back 20 B.
|
front 21 Which of the following groups of exposure factors will produce the shortest scale of contrast?
| back 21 B.
|
front 22 Characteristics of high-ratio focused grids, compared with lower-ratio grids, include which of the following?
| back 22 C.
|
front 23 A part whose width is 6 inches will be imaged at 44 inches SID. The part to be imaged lies 9 inches from the IR. What will be the projected image width of the part?
| back 23 A.
|
front 24 Geometric unsharpness is influenced by which of the following?
| back 24 D.
|
front 25 Which of the following will influence recorded detail?
| back 25 D.
|
front 26 All the following are related to recorded detail except
| back 26 A.
|
front 27 The exposure factors of 400 mA, 70 ms, and 78 kV were used to produce a particular radiographic density and contrast. A similar radiograph can be produced using 500 mA, 90 kV, and
| back 27 B.
|
front 28 Which of the following terms is used to express resolution/recorded detail?
| back 28 B.
|
front 29 A radiograph exposed using a 12:1 ratio grid may exhibit a loss of density at its lateral edges because the
| back 29 A.
|
front 30 Characteristics of low ratio focused grids include the following:
| back 30 B.
|
front 31 Which of the following terms refers to light being reflected from one intensifying screen, through the film, to the opposite emulsion and intensifying screen?
| back 31 B.
|
front 32 Shape distortion is influenced by the relationship between the
| back 32 D.
|
front 33 The sensitometric curve may be used to
| back 33 B.
|
front 34 Which of the following units is (are) used to express resolution?
| back 34 B.
|
front 35 The fact that x-ray intensity across the primary beam can vary as much as 45% describes the
| back 35 C.
|
front 36 An exposure was made using 300 mA, 40 ms exposure, and 85 kV. Each of the following changes will decrease the radiographic density by one half except a change to
| back 36 C.
|
front 37 Which of the following is the factor of choice for the regulation of radiographic (optical) density?
| back 37 B.
|
front 38 Exposure factors of 90 kVp and 4 mAs are used for a particular nongrid exposure. What should be the new mAs if an 8:1 grid is added?
| back 38 C.
|
front 39  The interaction between x-ray photons and matter illustrated in Figure 4–22 is most likely to be associated with
| back 39 A.
|
front 40 A decrease in kilovoltage will result in
| back 40 A.
|
front 41 Using a short (25–30 in.) SID with a large (14 x 17 in.) IR is likely to
| back 41 B.
|
front 42 When blue-emitting rare earth screens are matched properly with the correct film emulsion, what type of safelight should be used in the darkroom?
| back 42 B.
|
front 43 The reduction in x-ray photon intensity as the photon passes through material is termed
| back 43 C.
|
front 44 A radiograph made using 300 mA, 0.1 second, and 75 kVp exhibits motion unsharpness, but otherwise satisfactory technical quality. The radiograph will be repeated using a shorter exposure time. Using 86 kV and 500 mA, what should be the new exposure time?
| back 44 C.
|
front 45 With milliamperage adjusted to produce equal exposures, all the following statements are true except
| back 45 B.
|
front 46 Which of the following terms is used to describe unsharp edges of tiny radiographic details?
| back 46 C.
|
front 47 Focusing distance is associated with which of the following?
| back 47 D.
|
front 48 Phosphors classified as rare earth include
| back 48 B.
|
front 49 Greater latitude is available to the radiographer when using
| back 49 B.
|
front 50 The relationship between the height of a grid's lead strips and the distance between them is referred to as grid
| back 50 A.
|
front 51 Exposure factors of 400 mA, 20 ms, 68 kVp, 400-speed system, at 40-in. SID were used to produce a satisfactory radiographic image. A change to 4 mAs can be best compensated for by which of the following?
| back 51 D.
|
front 52 Exposure rate increases with an increase in
| back 52 B.
|
front 53 Of the following groups of technical factors, which will produce the greatest radiographic density?
| back 53 B.
|
front 54 Radiographic contrast is the result of
| back 54 B.
|
front 55 X-ray photon energy is inversely related to
| back 55 A.
|
front 56 A lateral radiograph of the lumbar spine was made using 200 mA, 1-second exposure, and 90 kV. If the exposure factors were changed to 200 mA, 0.5 second, and 104 kV, there would be an obvious change in which of the following?
| back 56 B.
|
front 57 If the center photocell were selected for a lateral projection of the lumbar spine that was positioned with the spinous processes instead of the vertebral bodies centered to the grid, how would the resulting radiograph look?
| back 57 A.
|
front 58 Conditions contributing to poor radiographic film archival quality include
| back 58 D.
|
front 59 Geometric unsharpness is most likely to be greater
| back 59 D.
|
front 60 A 5-in. object to be radiographed at a 44-in. SID lies 6 in. from the IR. What will be the image width?
| back 60 B.
|
front 61 Disadvantages of using low-kilovoltage technical factors include
| back 61 D.
|
front 62 What pixel size has a 1024 x 1024 matrix with a 35-cm FOV?
| back 62 B.
|
front 63 Which combination of exposure factors most likely will contribute to producing the shortest-scale contrast?
| back 63 D.
|
front 64 Which of the following will produce the greatest distortion?
| back 64 C.
|
front 65 Terms that refer to size distortion include
| back 65 A.
|
front 66 The exposure factors used for a particular nongrid x-ray image were 300 mA, 4 ms, and 90 kV. Another image, using an 8:1 grid, is requested. Which of the following groups of factors is most appropriate?
| back 66 B.
|
front 67  Figure 4–19 is representative of
| back 67 A.
|
front 68 Which of the following is (are) characteristic(s) of a 16:1 grid?
| back 68 B.
|
front 69 In which of the following ways can higher radiographic contrast be obtained in abdominal radiography?
| back 69 D.
|
front 70 The line-focus principle expresses the relationship between
| back 70 A.
|
front 71 An increase from 78 to 92 kVp will result in an increase in which of the following?
| back 71 D.
|
front 72 Using fixed milliampere-seconds and variable kilovoltage technical factors, each centimeter increase in patient thickness requires what adjustment in kilovoltage?
| back 72 A.
|
front 73 An exposure was made using 600 mA and 18 ms. If the mA is changed to 400, which of the following exposure times would most closely approximate the original radiographic density?
| back 73 C.
|
front 74 What pixel size has a 2048 x 2048 matrix with an 80-cm FOV?
| back 74 D.
|
front 75 In electronic imaging, as digital image matrix size increases
| back 75 A.
|
front 76 Which of the following would be appropriate cassette front material(s)?
| back 76 C.
|
front 77 OID is related to recorded detail in which of the following ways?
| back 77 B.
|
front 78 In an AP abdomen radiograph taken at 105-cm SID during an IVU series, one renal shadow measures 9 cm in width. If the OID is 18 cm, what is the actual width of the kidney?
| back 78 B.
|
front 79 If 32 mAs and 50-speed screens were used to produce a particular radiographic density, what new mAs value would be required to produce the same density if the screen speed were changed to 400?
| back 79 A.
|
front 80 Which of the following pathologic conditions would require an increase in exposure factors?
| back 80 D.
|
front 81 Which of the following is (are) associated with subject contrast?
| back 81 D.
|
front 82 If 300 mA has been selected for a particular exposure, what exposure time would be required to produce 60 mAs?
| back 82 D.
|
front 83 According to the line-focus principle, an anode with a small angle provides
| back 83 A.
|
front 84 Low-kilovoltage exposure factors usually are indicated for radiographic examinations using
| back 84 B.
|
front 85  What grid ratio is represented in Figure 4–8?
| back 85 C.
|
front 86 A part whose width is 6 inches will be imaged at 44 inches SID. The part to be imaged lies 9 inches from the IR. What will be the magnification factor?
| back 86 A.
|
front 87 Which of the following is (are) characteristic(s) of a 5:1 grid?
| back 87 A.
|
front 88 The microswitch for controlling the amount of replenishment used in an automatic processor is located at the
| back 88 C.
|
front 89 A 15% increase in kVp accompanied by a 50% decrease in mAs will result in a(n)
| back 89 B.
|
front 90 A dry laser printer is generally used when it is necessary to print digital images on film. This laser film is loaded under the following conditions
| back 90 A.
|
front 91 Which of the following pathologic conditions would require an increase in exposure factors?
| back 91 D.
|
front 92 What should be done to correct for magnification when using air-gap technique?
| back 92 D.
|
front 93 In amorphous selenium flat-panel detectors, the term amorphous refers to a
| back 93 B.
|
front 94 What pixel size has a 2,048 x 2,048 matrix with a 60-cm FOV?
| back 94 A.
|
front 95 An x-ray image of the ankle was made at 40-SID, 200 mA, 50 ms, 70 kV,
0.6 mm focal spot, and minimal OID. Which of the following
modifications would result in the greatest increase in magnification?
| back 95 D. |
front 96 Which of the following adult radiographic examinations usually require(s) use of a grid?
| back 96 D.
|
front 97 A particular radiograph was produced using 6 mAs and 110 kVp with an 8:1 ratio grid. The radiograph is to be repeated using a 16:1 ratio grid. What should be the new mAs?
| back 97 C.
|
front 98 If 92 kV and 12 mAs were used for a particular abdominal exposure with single-phase equipment, what mAs would be required to produce a similar radiograph with three-phase, six-pulse equipment?
| back 98 C.
|
front 99 Which of the following factors impact(s) recorded detail?
| back 99 D.
|
front 100 Recommended method(s) of minimizing motion unsharpness include
| back 100 D.
|
front 101 Recommended method(s) of minimizing motion unsharpness include
| back 101 D.
|
front 102 Geometric unsharpness will be least obvious
| back 102 D.
|
front 103 If a radiograph were made of an average-size knee using automatic exposure control (AEC) and all three photocells were selected, the resulting radiograph would demonstrate
| back 103 B.
|
front 104 Which of the following groups of exposure factors would be most appropriate to control involuntary motion?
| back 104 C.
|
front 105 An exposure was made using 300 mA and 50 ms. If the exposure time is changed to 22 ms, which of the following milliamperage selections would most closely approximate the original radiographic density?
| back 105 D.
|
front 106 If a 4-inch collimated field is changed to a 14-inch collimated field, with no other changes, the radiographic image will possess
| back 106 A.
|
front 107 Which of the following absorbers has the highest attenuation coefficient?
| back 107 A.
|
front 108 An exposure was made using 600 mA, 0.04-s exposure, and 85 kVp. Each of the following changes will serve to decrease the radiographic density by one-half except change to
| back 108 C.
|
front 109 Which of the following examinations might require the use of 120 kVp?
| back 109 D.
|
front 110  The radiograph of the pelvis shown in Figure 6–7 is unacceptable because of
| back 110 C.
|
front 111 Which of the following is most likely to produce a radiograph with a long scale of contrast?
| back 111 A.
|
front 112 As grid ratio is decreased,
| back 112 A.
|
front 113 Which of the following will contribute to the production of longer-scale radiographic contrast?
| back 113 C.
|
front 114 A decrease from 90 to 77 kVp will result in a decrease in which of the following?
| back 114 C.
|
front 115 Shape distortion is influenced by the relationship between the
| back 115 D.
|
front 116 Which of the following groups of technical factors will produce the least radiographic density?
| back 116 D.
|
front 117  Which of the lines indicated in Figure 4–2 represents the dynamic range offered by computed radiography/digital radiography (CR/DR)?
| back 117 A.
|
front 118 The variation in photon distribution between the anode and cathode ends of the x-ray tube is known as
| back 118 B.
|
front 119 The exposure factors of 300 mA, 0.07 second, and 95 kVp were used to produce a particular radiographic density and contrast. A similar radiograph can be produced using 500 mA, 80 kVp, and
| back 119 C.
|
front 120 The term differential absorption is related to
| back 120 C.
|
front 121 All the following have an impact on radiographic contrast except
| back 121 D.
|
front 122 Exposures less than the minimum response time of an AEC may be required when
| back 122 B.
|
front 123 If a radiograph exhibits insufficient density, this might be attributed to
| back 123 C.
|
front 124 Which of the following is (are) characteristic(s) of a 16:1 grid?
| back 124 D.
|
front 125 A 3-inch object to be radiographed at a 36-inch SID lies 4 inches from the image recorder. What will be the image width?
| back 125 B.
|
front 126 An overall image density arising from factors other than the light or radiation used to expose the image is called
| back 126 A.
|
front 127 How would the introduction of a 6-in. OID affect image contrast?
| back 127 A.
|
front 128 A grid is usually employed
| back 128 C.
|
front 129  The interaction between x-ray photons and matter illustrated in the figure below is most likely to occur
| back 129 C.
|
front 130 Why is a very short exposure time essential in chest radiography?
| back 130 C.
|
front 131 Recorded detail is directly related to
| back 131 A.
|
front 132 If a radiograph exposed using a 12:1 ratio grid exhibits a loss of density at its lateral edges, it is probably because the
| back 132 A.
|
front 133 Which of the following groups of exposure factors will produce the shortest scale of contrast?
| back 133 A.
|
front 134 Changes in milliampere-seconds can affect all the following except
| back 134 D.
|
front 135 Which of the following combinations is most likely to be associated with quantum mottle?
| back 135 C.
|
front 136 An increase in kilovoltage will serve to
| back 136 A.
|
front 137 Which of the following conditions would require an increase in exposure factors?
| back 137 B.
|
front 138 Compared to a low ratio grid, a high ratio grid will
| back 138 B.
|
front 139 The quantity of scattered radiation reaching the IR can be reduced through the use of
| back 139 C.
|
front 140 How are mAs and radiographic density related in the process of image formation?
| back 140 B.
|
front 141 During film–screen imaging, the manifest image is formed
| back 141 B.
|
front 142 Which of the following groups of exposure factors will produce the most radiographic density?
| back 142 C.
|
front 143 The absorption of useful radiation by a grid is called
| back 143 C.
|
front 144 Geometric unsharpness is directly influenced by
| back 144 A.
|
front 145 The appearance of underexposure on an image created using a high-speed film–screen system can be caused by all the following except
| back 145 C.
|
front 146 To be suitable for use in intensifying screens, a phosphor should have which of the following characteristics?
| back 146 D.
|
front 147 Which of the following pathologic conditions are considered additive conditions with respect to selection of exposure factors?
| back 147 D.
|
front 148 Using a 48-in. SID, how much OID must be introduced to magnify an object two times?
| back 148 D.
|
front 149 Exposure rate will decrease with an increase in
| back 149 A.
|
front 150 An increase in kilovoltage will have which of the following effects?
| back 150 B.
|
front 151 For which of the following examinations might the use of a grid not be necessary in an adult patient?
| back 151 B.
|
front 152  Which of the following groups of technical factors would be most appropriate for the radiographic examination shown in Figure 4–30?
| back 152 A.
|
front 153 The primary source of scattered radiation is the
| back 153 A.
|
front 154 The best way to control voluntary motion is
| back 154 B.
|
front 155 A particular milliampere-seconds value, regardless of the combination of milliamperes and time, will reproduce the same radiographic density. This is a statement of the
| back 155 C.
|
front 156 The radiographic accessory used to measure the thickness of body parts in order to determine optimal selection of exposure factors is the
| back 156 B.
|
front 157 An exposure was made at a 36-in. SID using 12 mAs and 75 kVp with a 400-speed imaging system and an 8:1 grid. A second radiograph is requested with improved recorded detail. Which of the following groups of technical factors will best accomplish this task?
| back 157 C.
|
front 158 Which of the following has the greatest effect on radiographic density?
| back 158 C.
|
front 159 To produce a just perceptible increase in radiographic density, the radiographer must increase the
| back 159 A.
|
front 160 How is SID related to exposure rate and radiographic density?
| back 160 D.
|
front 161 All the following are related to recorded detail except
| back 161 D.
|
front 162 The radiographic accessory used to measure the thickness of body parts in order to determine optimum selection of exposure factors is the
| back 162 B.
|
front 163 Which of the following will result if developer replenishment is inadequate?
| back 163 B.
|
front 164 A focal-spot size of 0.3 mm or smaller is essential for
| back 164 B.
|
front 165 Exposure factors of 80 kVp and 8 mAs are used for a particular nongrid exposure. What should be the new milliampere-seconds value if an 8:1 grid is added?
| back 165 C.
|
front 166 All the following affect the exposure rate of the primary beam except
| back 166 D.
|
front 167 Decreasing field size from 14 x 17 in. to 8 x 10 in., with no other changes, will
| back 167 A.
|
front 168 Which of the following contribute to the radiographic contrast present in the finished radiograph?
| back 168 D.
|
front 169 Compared with a low-ratio grid, a high-ratio grid will
| back 169 C.
|
front 170 A grid usually is employed in which of the following circumstances?
| back 170 C.
|
front 171 A graphic diagram of signal values representing various densities within the part being imaged is called a
| back 171 C.
|
front 172 Which of the following is (are) directly related to photon energy?
| back 172 A.
|
front 173 The CR should be directed to the center of the part of greatest interest to avoid
| back 173 A.
|
front 174 Which of the following matrix sizes is most likely to produce the best image resolution?
| back 174 D.
|
front 175 A shoulder was imaged using 300 mA, 7 ms, 70 kVp, 40-inch SID, 1.2-mm focal spot, and 100 speed screen/film combination. Which of the following changes, made to compensate for changes in optical density, would result in decreased production/visualization of blur?
| back 175 B.
|
front 176 If 84 kV and 8 mAs were used for a particular abdominal exposure with single-phase equipment, what milliampere-seconds value would be required to produce a similar radiograph with three-phase, 12-pulse equipment?
| back 176 D.
|
front 177 Of the following groups of exposure factors, which will produce the most radiographic density?
| back 177 C.
|
front 178 Which of the following conditions will require an increase in x-ray photon energy/penetration?
| back 178 D.
|
front 179 A compensating filter is used to
| back 179 B.
|
front 180 High-kilovoltage exposure factors are usually required for radiographic examinations using
| back 180 C.
|
front 181 If 400 mA, 10 ms, and 90 kV were used for a particular exposure using three-phase, 12-pulse equipment, which of the following exposure changes would be most appropriate for use on single-phase equipment to produce a similar image?
| back 181 D.
|
front 182 Underexposure of a radiograph can be caused by all the following except insufficient
| back 182 D.
|
front 183 Recorded detail can be improved by decreasing
| back 183 C.
|
front 184 If 85 kV and 20 mAs were used for a particular abdominal exposure with single-phase equipment, what mAs would be required to produce a similar radiograph with 3-phase, 12-pulse equipment.
| back 184 D.
|
front 185 If 82 kVp, 300 mA, and 0.05 second were used for a particular exposure using 3-phase, 12-pulse equipment, what mAs would be required, using single-phase equipment, to produce a similar radiograph?
| back 185 C.
|
front 186 Which of the following affect(s) both the quantity and the quality of the primary beam?
| back 186 C.
|
front 187 Methods that help to reduce the production of scattered radiation include using
| back 187 A.
|
front 188 If a duration of 0.05 second was selected for a particular exposure, what milliamperage would be necessary to produce 30 mAs?
| back 188 B.
|
front 189 Which of the following is (are) classified as rare earth phosphors?
| back 189 B.
|
front 190 In comparison with 60 kV, 80 kV will
| back 190 C.
|
front 191 A satisfactory radiograph was made without a grid using a 72-in. SID and 8 mAs. If the distance is changed to 40 in. and an 12:1 ratio grid is added, what should be the new milliampere-seconds value?
| back 191 B.
|
front 192 Which of the following examinations might require the use of 70 kV?
| back 192 A.
|
front 193 Recorded detail is directly related to
| back 193 A.
|
front 194 Several types of exposure timers may be found on x-ray equipment. Which of the following types of timers functions to accurately duplicate radiographic densities?
| back 194 D.
|
front 195 When involuntary motion must be considered, the exposure time may be cut in half if the kilovoltage is
| back 195 B.
|
front 196 Greater latitude is available to the radiographer in which of the following circumstances?
| back 196 B.
|
front 197 A positive contrast agent
| back 197 A.
|
front 198 Which of the following quantities of filtration is most likely to be used in mammography?
| back 198 A.
|
front 199 An exposure was made of a part using 300 mA and 0.06 second with a 200-speed film–screen combination. An additional radiograph is requested using a 400-speed system to reduce motion unsharpness. Using 400 mA, all other factors remaining constant, what should be the new exposure time?
| back 199 C.
|
front 200 Because of the anode heel effect, the intensity of the x-ray beam is greatest along the
| back 200 C.
|
front 201 Which of the following groups of exposure factors will produce the longest scale of contrast?
| back 201 B.
|
front 202 In which of the following examinations should 70 kV not be exceeded?
| back 202 C.
|
front 203 The squeegee assembly in an automatic processor
| back 203 C.
|
front 204 How is source-to-image distance (SID) related to exposure rate and radiographic density?
| back 204 D.
|
front 205 If 300 mA has been selected for a particular exposure, what exposure time should be selected to produce 18 mAs?
| back 205 B.
|
front 206 The direction of electron travel in the x-ray tube is
| back 206 B. cathode to anode |
front 207 Exposure factors of 90 kV and 3 mAs are used for a particular nongrid exposure. What should be the new milliampere-seconds (mAs) value if a 12:1 grid is added?
| back 207 D. 15 |
front 208 The attenuation of x-ray photons is not influenced by
| back 208 B. 3 only |
front 209 The functions of automatic beam limitation devices include
| back 209 A. 1 only |
front 210 An anteroposterior (AP) radiograph of the femur was made using 300 mA, 0.03 second, 76 kV, 40-in. SID, 1.2-mm focal spot, and a 400-speed film–screen system. With all other factors remaining constant, which of the following exposure times would be required to maintain radiographic density at a 44-in. SID using 500 mA?
| back 210 B. 22 ms |
front 211 If 85 kVp, 400 mA, and ? s were used for a particular exposure using single-phase equipment, which of the following milliamperage or time values would be required, all other factors being constant, to produce a similar density using three-phase, 12-pulse equipment?
| back 211 A. 200 mA |
front 212 Factor(s) that can be used to regulate radiographic density is (are)
| back 212 D. 1, 2, and 3 |
front 213 Which of the following groups of exposure factors would be most appropriate for a sthenic adult IVU?
| back 213 A. 300 mA, 0.02 s, 72 kVp |
front 214 The use of which of the following is (are) essential in magnification radiography?
| back 214 B. 2 only |
front 215 Which of the following are methods of limiting the production of scattered radiation?
| back 215 C. 2 and 3 only |
front 216 In a PA projection of the chest being used for cardiac evaluation, the heart measures 15.2 cm between its widest points. If the magnification factor is known to be 1.3, what is the actual diameter of the heart?
| back 216 B. 11.7 cm |
front 217 Which of the following can affect histogram appearance?
| back 217 D. 1, 2, and 3 |
front 218 In digital imaging, as the size of the image matrix increases,
| back 218 C. 2 and 3 only |
front 219 Which combination of exposure factors will most likely contribute to producing the longest-scale contrast?
| back 219 B. Group B |
front 220 A satisfactory radiograph of the abdomen was made at a 38-in. SID using 400 mA, 60-ms exposure, and 80 kV. If the distance is changed to 42 in., what new exposure time would be required?
| back 220 C. 73 ms |
front 221 A particular radiograph was produced using 12 mAs and 85 kV with a 16:1 ratio grid. The radiograph is to be repeated using an 8:1 ratio grid. What should be the new milliampere-seconds value?
| back 221 C. 8 |
front 222 When the collimated field must extend past the edge of the body, allowing primary radiation to strike the tabletop, as in a lateral lumbar spine radiograph, what may be done to prevent excessive radiographic density owing to undercutting?
| back 222 D. Use lead rubber to absorb tabletop primary radiation. |
front 223 A lateral radiograph of the cervical spine was made at 40 in. using 300 mA and 0.03 second exposure. If it is desired to increase the distance to 72 in., what should be the new milliampere (mA) setting, all other factors remaining constant?
| back 223 C. 1000 mA |
front 224 Which of the following focal-spot sizes should be employed for magnification radiography?
| back 224 A. 0.2 mm |
front 225 An AP radiograph of the femur was made using 300 mA, 0.03 second, 76 kV, 40-in. SID, 1.2-mm focal spot, and a 400-speed film–screen system. With all other factors remaining constant, which of the following exposure times would be required to maintain radiographic density using 87 kV, a 200-speed film–screen system, and the addition of a 12:1 grid?
| back 225 A. 0.15 second |
front 226 Which of the following is performed to check the correctness of the developing parameters?
| back 226 D.
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front 227 An increase in kilovoltage with appropriate compensation of milliampere-seconds will result in
| back 227 A.
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front 228 Which of the following groups of exposure factors would be most effective in eliminating prominent pulmonary vascular markings in the RAO position of the sternum?
| back 228 D.
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front 229 Which of the following factors is/are related to grid efficiency?
| back 229 D.
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front 230 Which one of the following is (are) used to control the production of scattered radiation?
| back 230 B.
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front 231 Types of shape distortion include
| back 231 C.
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front 232 If 300 mA has been selected for a particular exposure, what exposure time would be required to produce 6 mAs?
| back 232 D.
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front 233 Central ray angulation may be required for
| back 233 C.
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front 234 An automatic exposure control (AEC) device can operate on which of the following principles?
| back 234 C.
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front 235 Exposure factors of 110 kVp and 12 mAs are used with an 8:1 grid for a particular exposure. What should be the new mAs if a 12:1 grid is substituted?
| back 235 C.
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front 236  Which of the following statements is (are) true regarding Figure 7–10?
| back 236 C.
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front 237 Radiographic contrast is a result of
| back 237 B.
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front 238 Practice(s) that enable the radiographer to reduce the exposure time required for a particular image include
| back 238 D.
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front 239 Decreasing field size from 14 x 17 into 8 x 10 inches will
| back 239 A.
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front 240 Which of the following may be used to reduce the effect of scattered radiation on a finished radiograph?
| back 240 D.
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front 241 Cassette-front material can be made of which of the following?
| back 241 B.
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front 242 A technique chart should include which of the following information?
| back 242 D.
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front 243 If 40 mAs and a 200-speed screen–film system were used for a particular exposure, what new milliampere-seconds value would be required to produce the same density if the screen–film system were changed to 800 speed?
| back 243 A.
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front 244 The exposure factors of 400 mA, 17 ms, and 82 kV produce a milliampere-seconds value of
| back 244 B.
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front 245 The advantage(s) of high-kilovoltage chest radiography is (are) that
| back 245 D.
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front 246 A radiograph made using 300 mA, 0.1 second, and 75 kV exhibits motion unsharpness but otherwise satisfactory technical quality. The radiograph will be repeated using a shorter exposure time. Using 86 kV and 400 mA, what should be the new exposure time?
| back 246 B.
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front 247 The term latitude describes
| back 247 B.
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front 248 Of the following groups of exposure factors, which will produce the shortest scale of radiographic contrast?
| back 248 A.
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front 249 What type of x-ray imaging uses an area beam and a photostimulable phosphor as the IR?
| back 249 B.
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front 250 A technique chart should be prepared for each AEC x-ray unit and should contain which of the following information for each type of examination?
| back 250 D.
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front 251 X-ray photon beam attenuation is influenced by
| back 251 D.
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front 252 A satisfactory radiograph of the abdomen was made at a 42-inch SID using 300 mA, 0.06-second exposure, and 80 kVp. If the distance is changed to 38 inches, what new exposure time would be required?
| back 252 B.
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front 253 Better resolution is obtained with
| back 253 A.
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front 254 In radiography of a large abdomen, which of the following is (are) effective way(s) to minimize the amount of scattered radiation reaching the image receptor (IR)?
| back 254 A.
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front 255 With all other factors constant, as digital image matrix size increases,
| back 255 C.
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front 256 Compression of the breast during mammographic imaging improves the technical quality of the image because
| back 256 D.
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front 257 An exposure was made using 8 mAs and 60 kV. If the kilovoltage was changed to 70 to obtain longer-scale contrast, what new milliampere-seconds value is required to maintain density?
| back 257 B.
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front 258 Which of the following devices is used to overcome severe variation in patient anatomy or tissue density, providing more uniform radiographic density?
| back 258 A.
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front 259 If 0.05 second was selected for a particular exposure, what mA would be necessary to produce 15 mAs?
| back 259 D.
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front 260 Which of the following is likely to contribute to the radiographic contrast present on the finished radiograph?
| back 260 D.
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front 261 The effect described as differential absorption is
| back 261 D.
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front 262 A decrease from 200 to 100 mA will result in a decrease in which of the following?
| back 262 C.
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front 263 The steeper the straight-line portion of a characteristic curve for a particular film, the
| back 263 B.
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front 264 Which of the following terms/units is used to express the resolution of a diagnostic image?
| back 264 A.
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front 265 A satisfactory radiograph was made without a grid, using a 72-inch SID and 8 mAs. If the distance is changed to 40 inches and an 8:1 ratio grid is added, what should be the new mAs?
| back 265 A.
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front 266 Which of the following chemicals is used in the production of radiographic film emulsion?
| back 266 C.
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front 267 An increase in the kilovoltage applied to the x-ray tube increases the
| back 267 B.
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front 268 What is the single most important factor controlling size distortion?
| back 268 D.
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front 269 Combinations of milliamperage and exposure time that produce a particular milliampere-seconds value will produce identical radiographic density. This statement is an expression of the
| back 269 C.
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front 270 An increase in the kilovoltage applied to the x-ray tube increases the
| back 270 B.
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front 271 The major function of filtration is to reduce
| back 271 D.
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front 272 Which of the following methods can be used effectively to decrease differential absorption, providing a longer scale of contrast in the diagnostic range?
| back 272 B.
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front 273 Which of the following could be used to improve recorded detail?
| back 273 B.
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front 274 Which of the following is most likely to occur as a result of using a 30-in. SID with a 14 x 17 in. IR to radiograph a fairly homogeneous structure?
| back 274 B.
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front 275 Which of the following combinations will result in the most scattered radiation reaching the image receptor?
| back 275 C.
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front 276 Which of the following is most likely to produce a high-quality image?
| back 276 B.
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front 277 Distortion can be caused by
| back 277 D.
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front 278 Which of the following is most likely to result from the introduction of a grid to a particular radiographic examination?
| back 278 A.
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front 279 Which of the following can affect radiographic contrast?
| back 279 D.
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front 280 All other factors remaining the same, if a 14 x 17 in. field is collimated to a 4-in.-square field, the radiographic image will demonstrate
| back 280 B.
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front 281  http://radrevieweasy.com/loadBinary.aspx?name=saia8&filename=saia8_c007f133b.jpg
| back 281 C.
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front 282 Exposure factors of 100 kVp and 6 mAs are used with a 6:1 grid for a particular exposure. What should be the new milliampere-seconds value if a 12:1 grid is substituted?
| back 282 B.
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