Which type of detector is primarily used for imaging slow or still objects?

The correct choice highlights single scanning detectors as the preferred type for imaging slow or still objects. These detectors are designed to capture images by accumulating data over a longer period, which is especially beneficial for scenarios where objects are stationary or moving very slowly. The ability to integrate signals over time enhances the clarity and quality of the resultant image, making it suitable for detailed examination of stationary subjects.

In contrast, the other types of detectors mentioned serve different purposes. High-speed rotating detectors, for example, are optimized for fast-moving imaging and are typically used in dynamic environments where rapid changes occur, such as in the case of moving patients in medical imaging. Real-time motion detectors, on the other hand, are designed for capturing moving objects, focusing on detecting and responding to motion rather than providing detailed imaging of still objects. Multiple scanning detectors can involve various configurations and may not offer the same level of image clarity for slow or stationary objects as single scanning detectors do. Thus, single scanning detectors are specifically advantageous for their capabilities in rendering clear images of slow or still objects.