front 1 The overall ability of the image intensifier to make the image brighter is the | back 1 brightness gain |
front 2 The __________ is bonded directly to the input phospher. | back 2 photocathode |
front 3 The conversion factor is a(n) ________ term for brightness gain and is typically approximately ______ of the brightness gain value. | back 3 newer; 1% |
front 4 When the camera tube's electron stream travels across the target, if there is light present | back 4 electrons are transmitted |
front 5 Typical fluroscopic systems have spatial resolution capabilities in the range of | back 5 4-6 Lp/mm |
front 6 If a 30/23/15 cm image intensifier is operated in the 23-cm mode, the fluroscopic image will be magnified by a factor of | back 6 1.3 |
front 7 This part of the image intensifier is made of cesium iodide | back 7 input phosphor |
front 8 A face plate, signal plate, and target are all components of the | back 8 camera tube |
front 9 Which of the following accurately shows the energy sequence during fluroscopy? | back 9 x-rays to light to electrons to light |
front 10 The potential difference across the image intensifier is approximately | back 10 25kv |
front 11 Distortion of the fluroscopic image that appears as unequal magnification is | back 11 pincushion appearance |
front 12 The diameter of the output phosphor is approximately | back 12 2.5 cm |
front 13 A disadvantage of using magnification mode during fluoroscopy is | back 13 the patient receives additional dose |
front 14 ________ imaging is accomplished with fluoroscopy as opposed to radiography | back 14 Dynamic |
front 15 The conventional method for viewing the fluroscopic image is by | back 15 using a television monitor |
front 16 The electrostic focusing lenses have a _______ charge | back 16 negative |
front 17 A loss of brightness around the edge of the fluroscopic image caused by the curve of the photocathode is | back 17 vignetting |
front 18 In reference to image intensification, the function that adjusts and maintains the overall image density and contrast during the fluroscopic procedure is | back 18 ABC |
front 19 Increasing the mA is the way to correct a fluroscopic image that has | back 19 noise |
front 20 The formula for minification gain is | back 20 minification gain=input phosphor diameter2/output phosphor diameter2 |
front 21 The input phosphor is ________ than the output phosphor | back 21 larger |
front 22 Magnification of the fluorosopic image results in improved | back 22 spatial resolution |
front 23 The commercial fluroscope was developed by | back 23 Edison |
front 24 The ________ absorbs x-rays and emits light | back 24 input phosphor |
front 25 ________ is measured in cd/m2/mR/s | back 25 Conversion Factor |
front 26 This part of the image intensifier is made of zinc cadmium sulfide | back 26 output phosphor |
front 27 If the input phosphor measures 30 cm and the output phosphor measures 2.5 cm, what is the minification gain? | back 27 144 |
front 28 Before the image intensifier, the fluoroscopist may have worn ______ goggles to make it easier to see the dim fluroscopic image | back 28 red |
front 29 The formula for brightness gain is | back 29 brightness gain= minification gain x flux gain |
front 30 This part of the image intensifier absorbs light and produces electrons | back 30 photocathode |
front 31 The image intensifier improved fluroscopy by | back 31 A and C (making the image brighter and indirect viewing of the image) |
front 32 In fluoroscopy, shape distortion is caused by | back 32 the curved shape of the photocathode |
front 33 Each capacitor in a CCD represents a(n) | back 33 pixel |
front 34 The gain related to the decrease in size from the input to the output phosphor is the | back 34 minification gain |
front 35 The original fluoroscopic image was very | back 35 dim |
front 36 The _______ is located very close to the output phosphor. | back 36 accelerating anode |
front 37 When operated in magnification mode, the electrostatic lenses have ______ of a negative charge. | back 37 more |
front 38 The ratio of the number of light photons at the output phosphor as compared with the input phosphor is the | back 38 flux gain |
front 39 The image intensifier was introduced in the | back 39 1950s |
front 40 This part of the image intensifier is made of cesium and antimony compounds | back 40 photocathode |
front 41 The formula to determine the amount of magnification created when in magnification mode, the formula is | back 41 MF= full size input phosphor/selected input phosphor |
front 42 The image intensifier is located | back 42 inside the fluoro tower |
front 43 When the electron beam in the camera travels back and forth across, from top to bottom, it is moving in a ______ pattern. | back 43 raster |
front 44 The CCDs electric charge from the capacitors is sent to the | back 44 television monitor |
front 45 Photoemission occurs at the | back 45 photocathode |
front 46 The ________ is (are) found along the entire length of the image intensifier | back 46 electrostatic focusing lenses |
front 47 Vidicon refers to a type of | back 47 camera tube |
front 48 Semiconductor capacitors are components of the | back 48 CCD |
front 49 The _______ absorbs electrons and emits light | back 49 output phosphor |
front 50 The diameter of the input phosphor typically measures between | back 50 15-30 cm |