Which of the following PET quality control checks is performed weekly?

The chosen answer refers to Energy Window Calibration, which is a critical quality control check performed weekly in PET imaging. This calibration ensures that the system's energy discrimination is accurate, which is essential for proper image formation. If the energy windows are not calibrated correctly, it can lead to inaccurate readings and compromised image quality. By routinely calibrating the energy windows, the system can effectively differentiate between gamma photons that are relevant for imaging and those that are not, thereby enhancing the precision of the PET scans.

Performing this check weekly helps maintain the integrity of the imaging system and ensures that patient scans are reliable. In contrast, other checks, although important, may not require as frequent attention. For instance, preventative maintenance is typically scheduled on a less frequent basis, focusing on overall system upkeep rather than daily operational checks.