What method measures the response from every CT detector?

The correct answer is the method that measures the response from every CT detector is the Air Scan. In this process, the scanner collects data from all detectors with no object in the field of view, allowing for the assessment of the response of each individual detector. This is essential for identifying any discrepancies in detector performance, such as variations in sensitivity or noise levels, which can affect the quality of the images produced during a CT scan.

Conducting an Air Scan helps establish a baseline for the detector responses, ensuring that any subsequent imaging reflects true anatomical structures rather than artifacts introduced by malfunctioning detectors. This method is crucial for maintaining image quality and accuracy in diagnostic imaging.

Calibration checks, while important for ensuring overall system reliability, focus on confirming the proper functioning of the entire system rather than assessing each detector's performance individually. Image reconstruction is a process that occurs after data acquisition, where algorithms create a usable image from the data collected; it does not involve measuring detector responses directly. Ring artifacts relate to specific types of imaging errors, often a result of detector malfunction or miscalibration, but they do not measure detector responses either.