American Society of Radiologic Technologist (ASRT) Practice Exam

For an AP projection of the scapula, where should the central ray pass through?

1. Medial border of the scapula

2. Midscapular area

3. Acromion process

4. Inferior angle of the scapula

The correct answer is: Midscapular area

For an AP projection of the scapula, positioning the central ray to pass through the midscapular area is essential for obtaining a clear and accurate image. This location is typically centered approximately 2 inches inferior to the coracoid process and 2 inches medial to the lateral border of the scapula. By targeting the midscapular area, the image can effectively demonstrate both the body and the borders of the scapula without excessive distortion or superimposition of surrounding anatomy. This ensures that the diagnostic features of the scapula, such as its shape and articulations, can be properly evaluated. Other options involve different points of interest on the scapula, which may not encompass the entire structure adequately or could result in distortion of certain anatomical details. Focusing on the midscapular area provides a comprehensive view necessary for assessment in clinical practice.