American Society of Radiologic Technologist (ASRT) Practice Exam

What is the benefit of obtaining an image of the acromioclavicular joints with weights?

1. Shows separation of the sternoclavicular joint space

2. Shows separation of the acromioclavicular joint space

3. Enhances the appearance of metastatic disease

4. Increases the spatial resolution of the image

The correct answer is: Shows separation of the acromioclavicular joint space

Obtaining an image of the acromioclavicular joints with weights is primarily beneficial because it allows for a clearer assessment of any separation in the acromioclavicular joint space. When weights are added during the imaging process, they create a functional stress on the joint, which helps differentiate between normal variation and pathological conditions, such as joint instability or ligamentous injuries. This technique enhances the visualization of the joint's alignment and any potential displacement that may indicate injury, particularly relevant in cases of trauma or chronic shoulder instability. The other options do not accurately relate to the specific purpose of imaging the acromioclavicular joints with weights. For instance, while examining the sternoclavicular joint or conditions like metastatic disease are important, they are not the direct focus when assessing the acromioclavicular joint through the implementation of weight-bearing imaging techniques. Additionally, the primary goal is not to enhance the spatial resolution of the image; the intent of using weights is more about evaluating functional joint separation than purely improving image quality.