CAMRT Radiography Practice Exam

What is the minimum filtration requirement for x-ray equipment operating above 70 kVp?

1. 1.5 mm Al equivalent

2. 2.0 mm Al equivalent

3. 2.5 mm Al equivalent

4. 3.0 mm Al equivalent

The correct answer is: 2.5 mm Al equivalent

The minimum filtration requirement for x-ray equipment operating above 70 kVp is set to ensure patient safety and reduce unnecessary radiation exposure. The establishment of these guidelines is primarily to filter out low-energy photons that contribute to the patient's dose without improving image quality. For x-ray equipment operating above 70 kVp, a minimum of 2.5 mm of aluminum equivalent filtration is required. This level of filtration is designed to effectively attenuate the low-energy radiation while allowing high-energy photons to pass through, which are necessary for imaging. This requirement helps in improving the quality of the diagnostic image while minimizing the potential for adverse effects from radiation exposure. In practice, the filtration assists in protecting patients from added radiation and is a standard that radiology departments adhere to for equipment compliance. Having adequate filtration not only meets regulatory guidelines but also plays a vital role in enhancing patient safety during radiographic procedures.