Radiology Practice Test

What primarily determines the effectiveness of a CT scan?

1. The patient's anatomy and size

2. The selection of appropriate imaging protocols and parameters

3. The type of contrast material used

4. The experience of the technician

The correct answer is: The selection of appropriate imaging protocols and parameters

The effectiveness of a CT scan is primarily determined by the selection of appropriate imaging protocols and parameters. This includes choices related to the scanning technique, such as the slice thickness, radiation dose, timing of the scan, and use of contrast material. Proper protocol selection ensures that the images produced are of high quality and diagnostic value, allowing for accurate interpretation and detection of abnormalities. While factors such as the patient's anatomy and size, the type of contrast material used, and the experience of the technician can influence the quality of the scan, they do not have the same direct impact on the overall effectiveness as the choice of imaging parameters. For instance, a skilled technician and the right contrast material are important, but without an appropriate protocol tailored to the specific clinical question, even the best of those elements might not result in an effective diagnostic image. Thus, careful consideration of imaging protocols and parameters is essential for optimizing CT scan outcomes.