MEDICINE
RADIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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SID
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DAF
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ATF
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None of the above
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Detailed explanation-1: -Source to film distance (SFD) is a measurement of the variation to the film to be viewed from the X-ray tube [3]. The effect of source to film distance would also cause the film density and exposure time to change accordingly.
Detailed explanation-2: -Change in Source to Object Distance When the source to object distance increases, the intensity of the x-ray beam decreases following the inverse square law, this will result in a decrease in the intensity of the beam reaching the object, and this results in a decrease in image density (Figure 4).
Detailed explanation-3: -The standard SID (ref) utilized is set to be 100 cm. OID is the distance between the object (e.g., femur, abdomen) and the image receptor, which is directly proportional to magnification. The greater the OID, the greater the magnification.