What component restricts the size of the x-ray beam before it leaves the tubehead?

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Multiple Choice

What component restricts the size of the x-ray beam before it leaves the tubehead?

Restricting the X-ray field inside the tubehead to limit how large the beam becomes as it exits is essential for reducing patient dose and improving image quality. That role is filled by the lead collimator, which contains adjustable shutters to define the exposure field. The unleaded glass window mainly provides a passage for the X-rays and adds a small amount of filtration, but it does not shape the beam. The PID helps direct the beam and influences geometry, yet it does not set the field size. The tubehead seal maintains the internal environment and does not restrict the beam. So the lead collimator is the component that controls the beam size.

Restricting the X-ray field inside the tubehead to limit how large the beam becomes as it exits is essential for reducing patient dose and improving image quality. That role is filled by the lead collimator, which contains adjustable shutters to define the exposure field. The unleaded glass window mainly provides a passage for the X-rays and adds a small amount of filtration, but it does not shape the beam. The PID helps direct the beam and influences geometry, yet it does not set the field size. The tubehead seal maintains the internal environment and does not restrict the beam. So the lead collimator is the component that controls the beam size.

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