Which statement about SPECT is false?

• A. SPECT provides 3D images
• B. SPECT images are produced by detecting gamma photons
• C. SPECT is a nuclear medicine imaging modality
• D. SPECT uses ultrasound to form images

Answer: (D)

SPECT images are created by tomographic reconstruction from gamma photons emitted by a radiotracer inside the body. Detectors around the patient pick up these photons as the radiotracer distributes, and the data from many angles are assembled into 3D volumes that show functional information. This is a nuclear medicine technique, relying on radiopharmaceuticals that emit gamma rays, not on sound or mechanical waves.

The statement about using ultrasound to form SPECT images is not correct because ultrasound uses high-frequency sound waves with transducers to create images, while SPECT depends on detecting gamma photons from radioactive decay. The other statements align with how SPECT works: it produces 3D images through rotation and reconstruction, and it is indeed a nuclear medicine imaging modality.