Which of the following radiologic procedures requires that a contrast medium be injected into the renal pelvis via a catheter placed within the ureter?

Retrograde urography

Nephrotomography

IVU

Which of the following statements is (are) correct regarding the parietoacanthial projection (Waters' method) of the skull?

1. The head is rested on the extended chin.

2. The orbitomeatal line (OML) is perpendicular to the (IR).

3. The maxillary antra should be projected above the petrosa.

In the RPO position of the cervical spine, which anatomy is demonstrated:

(1) Left intervertebral foramina

(2) Right pedicles

(3) Right intervertebral foramina

(4) Left pedicles