American Registry of Radiologic Technologists (ARRT) Practice Exam

Question: 1 / 400

What impact does increasing the Source-to-Image Distance (SID) have on recorded detail?

It decreases recorded detail

It has no effect on recorded detail

It increases recorded detail

Increasing the Source-to-Image Distance (SID) positively impacts recorded detail in radiographic imaging. When the SID is increased, the x-ray beam diverges less by the time it reaches the imaging receptor, which results in a sharper image. This reduced divergence helps to minimize the geometric blur or penumbra around the edges of structures in the image.

Greater SID decreases the size of the x-ray focal spot's shadow on the image receptor, thereby enhancing spatial resolution and increasing the clarity of fine details. Additionally, a larger SID reduces the amount of scatter radiation reaching the film or detector, which can further contribute to improved image quality and detail. Therefore, increasing SID is a critical technique for optimizing image sharpness and achieving high-quality radiographs.

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It randomly affects recorded detail

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