CAMRT Radiography Practice Exam

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What should be the minimum distance between the focal spot and the tabletop in fluoroscopy equipment?

20 cm
25 cm
30 cm
35 cm

The correct answer is: 30 cm

The minimum distance between the focal spot and the tabletop in fluoroscopy equipment is critical for patient safety and image quality. A distance of 30 cm is established as a standard to reduce the risk of excessive radiation exposure to the patient and to enhance the resolution of the images. This distance allows for adequate beam divergence and minimizes the chances of scatter radiation reaching the patient, thus optimizing the imaging process. Following this guideline aligns with the principles of radiation physics, ensuring that while diagnostic imaging is performed, the dose to the patient is kept as low as reasonably achievable (ALARA principle). By maintaining a distance of 30 cm, the system can effectively balance the need for clear imaging and patient safety.