RESUMO
Although [18]F-fluorodeoxyglucose positron emission tomography [PET]/computed tomography [CT] has largely replaced the use of gallium-67 [[67]Ga] scintigraphy in the evaluation and follow-up of lymphoma patients, [67]Ga scans are still of value, particularly in countries where no PET/CT service is available. The current study presents the experience of a tertiary care centre using [67]Ga scintigraphy for the evaluation of lymphomas and infections. A retrospective review was conducted of all [67]Ga scans performed between 2007 and 2011 at the Royal Hospital in Muscat, Oman. Images and reports of [67]Ga scans were compared to clinical and radiological follow-up data including CT and PET/CT scans and biopsies when available. A total of 74 patients were referred for [67]Ga scintigraphy during this period with 12 patients excluded due to lack of follow-up data, resulting in 62 patients. Among these patients, 90 [67]Ga scans were performed, including 59 for lymphoma, 29 for infection and two for sarcoidosis assessment. Of the infection assessment scans, 22 were performed to assess pyrexia of unknown origin and seven for follow-up after known infections. Sensitivity and specificity were found to be 80% and 88%, respectively, for the lymphoma assessment scans. For the infection assessment scans, sensitivity and specificity were reported to be 80% and 100%, respectively. Results from this study were consistent with other reported rates of [67]Ga scan sensitivity and specificity in the evaluation of lymphomas and infections. This indicates that [67]Ga scintigraphy is a useful tool for these types of evaluations when PET/CT services are not available
RESUMO
One of the major limitations of myocardial scintigraphy is soft tissue attenuation, which could be interpreted as a true perfusion defects, particularly diaphragmatic and bowel attenuation of the inferior wall. The aim of this study was to evaluate the role of adding prone scan to the stress myocardial scintigraphy. Department of Radiology, Nuclear Medicine Section, King Faisal Specialist Hospital and Research Center. Retrospective study. Eighty-eight patients with coronary artery disease had myocardial perfusion scan and were reported with and without a prone scan during stress study. All patients in this study had a diagnostic coronary angiogram. Patients who had coronary angiogram within one month after the diagnostic cardiac scan were included. Patients who have been admitted to the hospital between the two procedures were excluded. Prone scan had improved the sensitivity [SN], specificity [SP], positive and negative predictive value [PPV, NPV] of the myocardial perfusion scintigraphy studies. Prone scan showed that SN, SP, PPV and NPV were, 91.7%, 70%, 78.6% and 87.5% compared to supine scan, which were 76.6%, 53.6%, 65.4% and 66.7%. In this study, we have found that the sensitivity and specificity had improved after the addition of prone stress scan in myocardial perfusion studies. Prone scan had helped in differentiating perfusion defects from attenuation artifacts, leading to improvement of detecting the true perfusion defects