A PA large intestine projection demonstrates a right iliac ala that is narrower than the left one. Such a projection
1)also demonstrates a shorter distance from the left pedicle to the spinous process than from the right pedicle to the spinous process.
2)also demonstrates an increase in ascending and descending left colic limb superimposition.
3)was obtained with the patient rotated toward the right side.
4)was obtained with the patient's left ASIS positioned at a greater OID than the right ASIS.
A) 1 only
B) 2 and 4 only
C) 3 and 4 only
D) 2, 3, and 4 only

Question

Quizplus · Accepted Answer

In a PA large intestine projection, if the right iliac ala appears narrower than the left, it indicates that the patient was rotated toward their right side. This rotation causes the left anterior superior iliac spine (ASIS) to be positioned at a greater object-to-image distance (OID) than the right ASIS, leading to an increase in the superimposition of the ascending and descending left colic limbs due to the angle of view. Additionally, the rotation affects the appearance of the pedicles in relation to the spinous processes, but this specific detail is not directly related to the choices provided.

A PA Large Intestine Projection Demonstrates a Right Iliac Ala