SPECT imaging provides 3D images of what?

• A. Time-lapse
• B. Color contrast
• C. Function
• D. Anatomy

Answer: (D)

SPECT imaging provides 3D maps of physiological function. It uses a radiotracer that distributes according to metabolic activity or blood flow, and the scanner detects the emitted gamma photons to reconstruct a three-dimensional image of tracer uptake. This uptake reflects how tissues are working rather than their exact structure, giving functional information about organs like the brain or heart. Pure anatomy is better represented by CT or MRI, while time-lapse and color contrast are more about how the data are displayed or how activity changes over time, rather than the fundamental output of the modality.