Patient dose is affected by1. inherent filtration2. added filtration3. source-image distance(A) 1 only(B) 1 and 2 only(C) 1 and 3 only(D) 1,2, and 3
D
The correct answer is (B) 1 and 2 only.
1. Inherent filtration: It refers to the filtration that is present in the X-ray tube and housing. It includes the glass envelope, oil, and other materials that are between the X-ray tube and the patient. Inherent filtration helps to reduce the amount of low energy X-ray photons that are emitted from the tube, which can lead to higher patient doses.
2. Added filtration: It refers to the filtration that is added to the X-ray beam before it reaches the patient. It includes metal foils, such as aluminum, that are placed in the path of the X-ray beam. Added filtration helps to reduce the amount of low energy X-ray photons that are emitted from the tube, which can lead to higher patient doses.
3. Source-image distance: It refers to the distance between the X-ray tube and the patient. As the source-image distance increases, the X-ray beam is more spread out and less concentrated on the patient. This results in lower patient doses. However, it is important to note that source-image distance may not be as effective in reducing patient dose as inherent and added filtration.
Therefore, patient dose is affected by inherent filtration and added filtration, but not exclusively by source-image distance.
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