Rad T 275 Lab
Today we are going to review the effects of collimation on contrast and dose. We will use the pelvis phantom for the
images along with the radiation detector.
You will acquire a series of images using the CR or DR (I will pick which groups
use which) system. The first image will be
a full pelvis image. Next you will center for a hip without changing the collimation. Third you will collimate to the hip.
For the last three images you will position the phantom in a lateral position and obtain l
ateral images of the sacrum. The
first image will be with the collimation set at 10 x 12 in the vertical direction (no lead). Second, collimate for a proper
lateral sacrum, approximately 7 x 12, no lead. Lastly, same collimation as image 2 with a lead blo
cker behind the