Which imaging modality provides a two-dimensional picture of a body radiation source using radioisotopes?

Which imaging modality provides a two-dimensional picture of a body radiation source using radioisotopes?

• A. Scintigraphy
• B. Videofluoroscopy
• C. FEES
• D. Ultrasonography

Answer: (A)

Scintigraphy uses a radioactive tracer that distributes in the body according to physiology, and a gamma camera captures the emitted radiation to form a two-dimensional image of where the tracer concentrates. This directly provides a planar picture of a body radiation source using radioisotopes. The other modalities do not rely on radiotracers: videofluoroscopy uses X-ray with contrast to show swallowing motion in real time; FEES visualizes the swallow with a fiberoptic endoscope; ultrasonography uses sound waves and does not involve radioisotopes.

Scintigraphy uses a radioactive tracer that distributes in the body according to physiology, and a gamma camera captures the emitted radiation to form a two-dimensional image of where the tracer concentrates. This directly provides a planar picture of a body radiation source using radioisotopes. The other modalities do not rely on radiotracers: videofluoroscopy uses X-ray with contrast to show swallowing motion in real time; FEES visualizes the swallow with a fiberoptic endoscope; ultrasonography uses sound waves and does not involve radioisotopes.