[en] Objective: To study the prognostic value of myocardial perfusion tomographic imaging in patients underwent percutaneous coronary angioplasty (PTCA) plus stent. Methods: 75 patients underwent 99Tcm-MIBI stress-rest myocardial perfusion tomographic imaging 6.91±2.99 months after PTCA. They were followed-up for 41.71±20.00 months, and we recorded unstable angina pectoris, acute myocardial infarction, cardiac death and revascularization for cardiac events. Results: 25 patients had cardiac events during follow-up. And the cardiac event rate in patients with normal and fixed defects (5.9%, 16.7%) was significantly lower than those with reversible defects (52.5%)(χ²=10.94, P<0.017; χ²=6.57, P<0.017). Survival analysis showed that the time free of cardiac event in patients with normal and fixed defects was significantly shorter than those with reversible defects (χ²=7.37, P=0.0066, χ²=6.28, P=0.012), and the mean time free of carciac event in the latter was 33.8±5.0 months. Conclusions: The presence of reversible defects in post PTCA cardiac imaging predicts a higher cardiac event rate, the myocardial perfusion tomography imaging after PTCA is valuable in predicting the prognosis of patients after PTCA plus stent. (authors)

[en] Objective: To analyze the cause of radionuclide imaging waste films and its prevention. Methods: According to the criteria of waste X-film in radiology, 9533 imaging films of nuclear medicine produced by Codonics 1600N 'dry' laser printer were analyzed. The total waste film rate and individual rate among different items were also calculated. Results: The total waste film rate was 2.6% (248/9533). And among the 248 waste films, 60(24.2%) waste films were due to machine malfunction, 148(59.7%) were due to irresponsibility work and 40(16.1%) were due to technical problem. Individual waste film rate for different items were in order of: 9.3%(15/161) for ¹⁸F-fluorodeoxyglucose (FDG) metabolic imaging, 4.6% (40/871) for renal dynamic imaging, 3.0% (11/362) for perfusion and ventilation lung imaging, 2.6% (9/352) for parotid dynamic imaging and 2.5% (61/2450) for bone imaging. Conclusions: The main reason for the production of waste films was the irresponsibility of the operators, and then the technical problem and the machine malfunction. The more energetic and precise the operators are, the less likely the waste films will be encountered. (authors)

[en] Objective: To study the prognostic value of myocardial perfusion tomographic imaging in patients after percutaneous transluminal coronary angioplasty (PTCA) plus stent. Methods: Seventy-five patients underwent ⁹⁹Tc^m-methoxyisobutylisonitrile (MIBI) stress-rest myocardial perfusion tomographic imaging (6.91 ± 2.99) months after PTCA. They were then followed-up for (41.71 ± 20.00) months, and unstable angina pectoris, acute myocardial infarction, cardiac death and revascularization for cardiac events were recorded during follow-up. Results: Twenty-five patients had cardiac events during follow-up. And the cardiac event rate in patients with normal and fixed defects(5.9%, 16.7%) was significantly lower than that in those with reversible defects (52.5%, χ²=10.94, P<0.017; χ²=6.57, P<0.017). Survival analysis showed that the time free of cardiac event in patients with reversible defects was significantly shorter than in those with normal and fixed defects (χ²=7.37, P=0.0066; χ²=6.28, P=0.012), and the mean time free of cardiac event after PTCA was (33.8 ± 5.0) months. Conclusion: The presence of reversible defects on post-PTCA cardiac imaging predicts a higher cardiac event rate, the myocardial perfusion tomography imaging after PTCA is valuable for predicting the prognosis of patients after PTCA plus stent. (authors)

[en] Objective: The purpose of this study was to obtain the ¹⁸F-fluorodeoxyglucose (FDG) uptake characteristics in normal adrenal gland as the criteria to diagnose abnormal glucose metabolism in ad- renal gland by ¹⁸F-FDG PET or PET/CT imaging. Methods: One hundred healthy persons underwent ¹⁸F- FDG PET/CT imaging in this study. The images were reviewed by visual judgement and measured by stand-ardized uptake value (SUV). With reference to normal liver, the uptake of adrenal gland was scored from 0 to 3, namely, 0=no uptake, 1=less than the uptake of normal liver, 2=equal to the uptake of normal liver, 3=more than the uptake of normal liver. SUV was measured on the trans-axial images. The regions of interest (ROIs) of adrenal glands and livers were manually drawn based on the CT images. Both average SUV (SUV_avg) and maximum SUV(SUV_max) were calculated. Results: (1) By visual judgment, 94% and 91% of left and right normal adrenal glands had uptake intensity less than that of livers. (2) The SUV_avg of left and right adrenal glands were 1.39 and 1.65, and the SUV_max 1.98 and 2.19, respectively with the up- per limit of 95% confidence interval (Cf). (3)The ratios of left and right adrenal glands SUV_avg to livers SUV_avg were 0.65 and 0.75 and left and right adrenal glands SUV_max to livers SUV_max were 0.76 and 0.83 respectively with the upper limit of 95% CI. (4)The uptake of right adrenal gland was higher than that of the left. (5)There was no significant difference of the SUVs between men and women, except that right ad- renal gland SUV_max of men was higher than that of women. (6) There was no significant difference in ¹⁸F- FDG uptake between persons younger and elder than 60 years old. Conclusion: The physiological FDG uptake of the adrenal gland in normal healthy individuals is generally lower than that of liver. (authors)