Which option is not considered part of beam geometry angles in radiography?

Which option is not considered part of beam geometry angles in radiography?

• A. x-ray tube angle
• B. object angle
• C. rotor angle
• D. image receptor angle

Answer: (C)

Beam geometry angles describe how the X-ray beam, the object being imaged, and the image receptor are oriented relative to one another. The tube angle tilts the beam direction, the object angle changes the part’s orientation to the beam, and the image receptor angle tilts the detector to align with the beam’s projection. These angles directly influence projection geometry, distortion, and magnification. Rotor angle, however, relates to the X-ray tube’s internal mechanism—the rotor that spins the anode to produce X-rays and control exposure timing and heat. It does not define the spatial relationship of the beam to the object or to the detector, so it is not considered part of beam geometry angles.

Beam geometry angles describe how the X-ray beam, the object being imaged, and the image receptor are oriented relative to one another. The tube angle tilts the beam direction, the object angle changes the part’s orientation to the beam, and the image receptor angle tilts the detector to align with the beam’s projection. These angles directly influence projection geometry, distortion, and magnification.

Rotor angle, however, relates to the X-ray tube’s internal mechanism—the rotor that spins the anode to produce X-rays and control exposure timing and heat. It does not define the spatial relationship of the beam to the object or to the detector, so it is not considered part of beam geometry angles.