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Physicians responsible for the daily operations of nuclear medicine clinics often find the regulations concerning the safe handling and administration of radiopharmaceuticals daunting. Even experienced authorized users have concerns about handling many new therapeutic agents. Those studying for certifying and subspecialty examinations or for maintenance of certification for the American Board of Nuclear Medicine and the American Board of Radiology must clearly understand the overall process for becoming an authorized user.

Abnormal perfusion is seen in a small percentage of patients at 30 to 60 minutes and in none at 90 to 120 minutes after a brief transient balloon occlusion. These results might have important implications in patient care.

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