The procedure is simple and accurate. A perfusion lung scan may show the flow of blood as far distal as the capillaries. This shows what parts of the lung are, and what parts are not, functioning. Before the perfusion scan is performed, a ventilation scan is done. Once the 4mCi of Technetium—MAA is injected, the distribution of the radioactive isotope will coincide with the pulmonary blood flow.
MAA better known as macroaggregated serum albumin is important to all nuclear medicine departments. MAA is commercially supplied in a sterile solution that is precalibrated for emergency situations. Six views of the lungs are taken as follows:.
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a. LPO—left posterior oblique
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b. Posterior
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c. RPO—right posterior oblique
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d. Right lateral
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e. Anterior
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f. Left lateral
