CAMRT Radiography Practice Exam

What projection is used to image the distal humerus laterally without limb rotation?

1. Cross table lateral projection

2. Transthoracic projection

3. Anteroposterior projection

4. Oblique projection

The correct answer is: Cross table lateral projection

The cross table lateral projection is the method used to image the distal humerus laterally without causing rotation of the limb. This technique involves positioning the patient so that the beam is directed horizontally to the area of interest, which allows for a clear view of the distal humerus while keeping the arm in its natural position. This projection is particularly useful in trauma cases where mobility might be compromised, as it minimizes discomfort and the risk of further injury during positioning. By utilizing this method, radiographers can achieve an optimal lateral view of the humerus, providing essential information for diagnosis and treatment planning. Other imaging techniques listed would not maintain the desired lateral position or could potentially induce rotation of the limb. For instance, the transthoracic projection typically involves positioning that could inadvertently rotate the shoulder and humerus, which is not ideal for lateral imaging. The anteroposterior projection produces a frontal view that does not adequately represent the lateral aspect of the humerus, and the oblique projection does not provide a pure lateral view, which is necessary in this context.