Where does collimation of the x-ray beam occur?

Collimation of the x-ray beam primarily occurs at the x-ray tube, which is essential for controlling the radiation exposure to the patient and ensuring optimal image quality. The function of collimation is to narrow the x-ray beam to the desired area, which not only helps in reducing unnecessary radiation dose to surrounding tissues but also enhances contrast and resolution in the resulting images.

By regulating slice thickness, collimation contributes to the detail and clarity of the CT images, allowing for better visualization of anatomical structures. Properly collimated beams help minimize the volume of tissue irradiated, thereby reducing the risk of radiation-induced effects and ensuring that the diagnostic information can be obtained with minimal patient exposure.

This aspect of CT imaging is vital for ensuring the safety and efficacy of the procedure, allowing for high-quality diagnostic outputs while maintaining patient care standards. The other options do not address the primary location and purpose of collimation in the context of CT imaging.