CAMRT Radiography Practice Exam

Dynamic range in a CT detector represents what?

1. Amount of patient exposure

2. Ratio of the largest to smallest signal measured

3. Brightness level of the images

4. Differences in tissue density

The correct answer is: Ratio of the largest to smallest signal measured

The dynamic range in a CT detector refers to the ratio of the largest to smallest signal that can be accurately measured by the detector. This is important because it indicates the detector's ability to capture and differentiate between varying levels of x-ray intensity that result from different tissues in the body. A wide dynamic range allows for better contrast and detail in imaging, enabling the detection of subtle differences in anatomical structures. The other choices refer to different aspects of radiography. The amount of patient exposure relates to the radiation dose a patient receives during imaging but does not define dynamic range. Brightness level of images pertains to the display and interpretation of the CT images rather than the measurement capabilities of the detector itself. Lastly, differences in tissue density refer to how differing types of tissues absorb x-rays but is not a direct measure of the dynamic range of the detector.