American Society of Radiologic Technologist (ASRT) Practice Exam

A ________ can be used to create even exposure across an image receptor when imaging anatomy with uneven thickness.

1. Collimator

2. Compensating filter

3. Shadow shield

4. Positioning sponge

The correct answer is: Compensating filter

The use of a compensating filter is essential for achieving uniform radiographic exposure when imaging anatomy that has variable thickness. These filters are specifically designed to accommodate areas of different density and attenuation, such as the curvature of the abdomen or the asymmetry of certain body parts. By placing a compensating filter in the path of the X-ray beam, radiologic technologists can minimize the differences in exposure across the image receptor, leading to a more consistent and diagnostically useful image. Compensating filters can be made of materials that vary in thickness or density and are tailored to the specific examination being performed. This allows for compensation of thicker areas of anatomy, ensuring that the radiograph maintains an overall uniform brightness and contrast, which is particularly critical in assessments and diagnoses.