The useful image acquisition area of an image receptor is which?

• A. Detector Element
• B. Detector Size
• C. TFT Size
• D. Dynamic Range

Answer: (B)

The usable image area is defined by the detector’s active size. This represents the physical field of view that the image receptor can capture and that will appear in the digital image. The detector element describes a single sensing unit, and the TFT size relates to how each pixel is read out, not the overall area. Dynamic range deals with how many gray levels can be recorded, not how large the imaging area is. So the detector size best matches the concept of the useful image acquisition area.