21. Positron emission tomography ( PET ) scanning deals with positrons instead of gamma rays detected by gamma cameras . 22. Is this even possible with modern gamma cameras ? talk ) 17 : 00, 5 February 2011 ( UTC) 23. However, it is possible to acquire PET images using a conventional dual-head gamma camera fitted with a coincidence detector. 24. It is very similar to conventional nuclear medicine planar imaging using a gamma camera ( that is, scintigraphy ). 25. The Tc-99m then further decays, while inside a patient, releasing a gamma photon which is detected by the gamma camera . 26. The isotopes are injected into the patient, and a special camera, called a gamma camera , takes pictures of the area. 27. It is also possible to perform the scan with positron emission tomography ( PET ) rather than conventional gamma camera scintigraphy. 28. Technetium-99m is used as a radioactive tracer and can be detected in the body by medical equipment ( gamma cameras ). 29. The patient is placed under a gamma camera , which detects the low-level 140 keV gamma radiation being given off by technetium-99m. 30. SPECT ( single photon emission computed tomography ) imaging, as used in nuclear cardiac stress testing, is performed using gamma cameras .
