ARRT Spine and Pelvis Procedures 2

Question 1

Which projection best demonstrates the zygapophyseal joints of the lumbar spine on the side closest to the image receptor?

Accepted Answer

45-degree oblique projection

Answer

A 45-degree oblique projection of the lumbar spine demonstrates the zygapophyseal joints on the side closest to the IR (downside joints on RPO/LPO).

Question 2

For a lateral projection of the sacrum, the central ray is directed:

Accepted Answer

Perpendicular to the IR

Answer

For a lateral sacrum projection, the central ray is directed perpendicular to the IR, centered to the sacrum at the level of the ASIS.

Question 3

The 'Scottie dog' appearance seen on oblique lumbar spine images represents which anatomical structures?

Accepted Answer

Pedicles, transverse processes, and articular processes

Answer

The 'Scottie dog' silhouette on oblique lumbar images is formed by the pedicle (eye), transverse process (nose), superior articular process (ear), inferior articular process (front leg), and pars interarticularis (neck).

Question 4

Which centering point is used for the AP projection of the sacroiliac joints?

Accepted Answer

2 inches superior to the pubic symphysis and 2 inches lateral to midline

Answer

For AP oblique projections of the sacroiliac joints, the CR is directed to a point 1 inch medial to the elevated ASIS, approximately 2 inches superior to the symphysis pubis.

Question 5

When performing a lateral projection of the cervical spine, what is the minimum SID recommended to reduce magnification?

Accepted Answer

72 inches (183 cm)

Answer

A 72-inch (183 cm) SID is recommended for lateral cervical spine projections to reduce magnification caused by the large OID between the neck and the IR.

ARRT - American Registry of Radiologic Technologists Practice Test

ARRT - American Registry of Radiologic Technologists Practice Test

ARRT Spine and Pelvis Procedures 2