What is the typical Source-to-Image Distance (SID) used in these radiographic procedures?

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Multiple Choice

What is the typical Source-to-Image Distance (SID) used in these radiographic procedures?

In mammography, the imaging geometry uses a relatively short Source-to-Image Distance to keep the breast close to the detector, which helps preserve sharp detail while keeping the dose reasonable. The typical SID is about 65 to 66 cm. This distance minimizes magnification and blurring, so tiny structures such as microcalcifications can be seen clearly, and it also fits the breast field coverage effectively with the compression applied. Using a longer distance, like 100 cm or more, would increase magnification and blur fine details, making it harder to detect small abnormalities, while a much shorter distance would create impractical geometry and coverage issues. So the standard SID for these procedures is around 65–66 cm.

In mammography, the imaging geometry uses a relatively short Source-to-Image Distance to keep the breast close to the detector, which helps preserve sharp detail while keeping the dose reasonable. The typical SID is about 65 to 66 cm. This distance minimizes magnification and blurring, so tiny structures such as microcalcifications can be seen clearly, and it also fits the breast field coverage effectively with the compression applied. Using a longer distance, like 100 cm or more, would increase magnification and blur fine details, making it harder to detect small abnormalities, while a much shorter distance would create impractical geometry and coverage issues. So the standard SID for these procedures is around 65–66 cm.

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