What is a main disadvantage of using thick detector rows in computed tomography?

The main disadvantage of using thick detector rows in computed tomography relates to the impact on spatial resolution. Spatial resolution refers to the ability of a CT system to distinguish small details in the image. Thicker detector rows capture more radiation over a wider area, which can result in a loss of fine detail. This occurs because the larger volume of tissue being imaged can combine or "blur" the boundaries of adjacent structures, leading to a decrease in the clarity of the image.

When spatial resolution is reduced, it becomes more challenging to visualize small lesions or structural details, which can be critical in diagnostic imaging. Therefore, while thicker detector rows can sometimes help in terms of speed or signal strength, they compromise the system’s ability to capture high-resolution images, which is essential for accurate interpretation and diagnosis.

The other options may have implications for various aspects of CT imaging, such as patient exposure or scanning efficiency, but the relationship between thick detector rows and diminished spatial resolution is the primary concern in this context.