![]() ![]() The lung volumes calculated in 5 patients by SPECT (threshold level 20%) using 99m Tc-macroaggregated albumin (MAA), related very closely to the actually measured lung volumes. Measurement of lung volume by lung perfusion scanning using single photon emission computed tomography (SPECT) and its usefulness for the prediction of respiratory function after lung resection were investigated. Measurement of lung volume by lung perfusion scanning using SPECT and prediction of postoperative respiratory functionĪndou, Akio Shimizu, Nobuyosi Maruyama, Shuichiro Usefulness of emergency perfusion lung scan in Japan should be stressed. Using Kr-81m ventilation lung scan, V/Q mismatch was found in all of 10 cases. However, the remaining 2 cases were equivocal because of underlying chronic lung disease. In 33 emergency cases who were highly suspected to have PE, we could diagnose 12 cases of PE, and 19 cases of non-PE. However, we have experienced 12 acute PE, and 2 chronic PE in 5 years 2 months. ![]() Pulmonary embolism (PE) has been reported to be quite rare in Japan, and there have been few clinical studies on the nuclear diagnosis of PE with the exception of several case reports. Ueno, Kyoichi Kabuto, Hiroko Rikimaru, Shigeho The perfusion lung scan is a valuable, noninvasive study in the evaluation of the patient with pulmonary hypertension of undetermined cause and in the exclusion of occult large-vessel pulmonary thromboembolismĮmergency perfusion lung scan of pulmonary embolism The lung scan in primary pulmonary hypertension was associated with nonsegmental, patchy defects of perfusion, while in thromboembolic hypertensives it was characterized by segmental and/or lobar defects of perfusion with or without subsegmental defects. The perfusion lung scan was distinctly different in the two groups. Of eight patients with pulmonary arterial hypertension, final diagnosis established by autopsy or angiography, four had primary hypertension and four hypertension from thromboembolism. Perfusion lung scanning: differentiation of primary from thromboembolic pulmonary hypertension This report presents a case with artifactual hot spots due to microsphere clumping on Tc-99m MAA perfusion lung scan Although these artifactual hot spots have been well-known, we rarely encounter them. Artifactual hot spots due to microsphere clumping usually appear to be round and in peripheral location, and the lesions due to a loss of hypoxic vasoconstriction usually appear to be hot uptakes having linear borders. Focal hot spots can signify zones of atelectasis, where the hot spots probably represent a failure of hypoxic vasoconstriction. Hot spots on perfusion lung scan can be caused by microsphere clumping due to faulty injection technique by radioactive embolization from upper extremity thrombophlebitis after injection. A repeated perfusion lung scan taken 24 hours later demonstrated no abnormalities. ![]() Tc-99m DTPA aerosol inhalation lung scan and chest radiography taken at the same time showed normal findings. Tc-99m MAA perfusion lung scan showed multiple round hot spots in both lung fields. International Nuclear Information System (INIS)Ī 61 year-old woman underwent perfusion and inhalation lung scan for the evaluation of pulmonary thromboembolism. Hot spots on Tc-99m MAA perfusion lung scan ![]()
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