WHAT IS OCTREOTIDE SCAN (SOMATOSTATIN-RECEPTOR SCINTIGRAPHY) TEST?
An octreotide scan is a nuclear medicine scan of the whole body after injection of a radioactive tracer, [111In-DTPA-D- Phe]octreotide or [123I-Thy3]octreotide, for the purpose of detecting areas of increased uptake by somatostatin-receptor tumours. The octreotide tracer is a somatostatin analogue. Various organs and tumours uptake the tracer at varying degrees. The tracer radiation is emitted as gamma rays and is detected by gamma cameras. A series of images are taken from various angles around the client and compiled by single-photon emission computed tomography (SPECT). Cross-sectional and three-dimensional imaging can be accomplished. A series of scans are conducted at 4- and 24-hours following injection of the radioisotope. Additional scans may be done.