RADIOISOTOPE SCINTIPHOTOGRAPHY WITH TECHNETIUM 99m AND THE GAMMA SCINTILLATION CAMERA

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Abstract
The physical properties of technetium 99m allow millicurie quantities to be administered to a patient without radiation hazard. Its clean 140 kev. gamma ray makes it an ideal agent for use with the scintillation camera. Count rates as high as 700,000 per minute are achieved and consequently, multiple views can easily be obtained, thus enhancing diagnostic accuracy. It is now possible to use exposures so short that they can be made while the patient holds his breath. This eliminates the resolution loss caused by respiration in scanning moving organs such as liver and spleen. Several chemical forms of technetium are now available for radioisotope imaging. These include pertechnetate for thyroid and brain; sulfur colloid for liver, spleen and marrow; iron complex for kidney; albumin for blood pool; and aggregated albumin for lung. Examples of the clinical use of these agents with the gamma scintillation camera are described.

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