What is the shape of the collimator in CBCT?

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Multiple Choice

What is the shape of the collimator in CBCT?

Explanation:
In CBCT, the collimator opening is rectangular. The x‑ray beam itself is cone-shaped, but the collimator defines the window through which radiation exits the tube, and that opening is made rectangular to match the flat-panel detector and the commonly used rectangular field-of-view. This rectangular shaping lets you tailor the dose to the exact region of interest and align precisely with the detector, avoiding unnecessary exposure outside the area being imaged. A circular or other shapes would not align as efficiently with the detector and FOV options, so rectangular collimation is preferred for CBCT.

In CBCT, the collimator opening is rectangular. The x‑ray beam itself is cone-shaped, but the collimator defines the window through which radiation exits the tube, and that opening is made rectangular to match the flat-panel detector and the commonly used rectangular field-of-view. This rectangular shaping lets you tailor the dose to the exact region of interest and align precisely with the detector, avoiding unnecessary exposure outside the area being imaged. A circular or other shapes would not align as efficiently with the detector and FOV options, so rectangular collimation is preferred for CBCT.

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