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Objective:To investigate the correlation between lumbar bone mineral density (BMD), musculoskeletal perfusion andmuscle mass.Methods:From May 2019 to August 2020, totally 91 patients who applied for CT perfusion (CTP) examination of abdomen (the scan range included the vertebral body of L1－L3) in Shanghai Tenth People′s Hospital of Tongji University were retrospectively analyzed. The mean BMD of L1－L3 vertebral body was measured by quantitative CT (QCT) at the same time of CT plain scan. According to BMD, the subjects were divided into normal BMD group ( n=33), osteopenia group ( n=41) and osteoporosis (OP) group ( n=17). The L3 level perivertebral muscle mass index and fat fraction were calculated based on QCT examination. The lumbar vertebral and perivertebral muscle perfusion parameters were measured based on CTP images. The parameters of QCT and CTP among three groups were analyzed by Kruskal-Wallis H test or one-way ANOVA. The correlation analysis was conducted between these parameters using Pearson or Spearman analysis. Results:The differences of the perivertebral muscle mass index and fat fraction among three groups were statistically significant ( P<0.05). The differences of the lumbar vertebral perfusion parameters including blood flow (BF), blood volume (BV) and flow extraction product (FE) among three groups were statistically significant ( P<0.05), and BF, BV and FE were positively correlated with BMD ( r=0.444, 0.312 and 0.266 respectively, all P<0.05; adjusted for age and gender r=0.437, 0.340 and 0.337 respectively, all P<0.05). There was no statistically significant difference in perivertebral muscle perfusion parameters among three groups ( P>0.05). Perivertebral muscle mass index was negatively correlated with fat fraction ( r=-0.599, P<0.001; adjusted for age and gender r=-0.404, P<0.001), and there was no correlation between perivertebral muscle mass index and muscle perfusion parameters, as well as perivertebral muscle fat fraction and muscle perfusion parameters. Conclusions:With the changes of BMD, bone mass and perivertebral muscle mass at L3 level are synchronous. Decreased vertebral bone mass is accompanied with reduced perivertebral muscle mass, increased muscle fat and decreased bone perfusion. The changes of vertebral perfusion and perivertebral muscle perfusion at L3 level are asynchronous, which implies that reduced perfusion in OP patients may be confined to the bone.
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Objective To evaluate the category of the variations on bilateral renal artery and clinical significance with 64-slice spiral CT angiography. Methods CT angiography of 250 patients were retrospectively analyzed. The variations on bilateral renal artery were observed and classified. Results According to the number of the main renal artery, the anatomy of renal artery was classified and typed in details. The incidence of the variations on renal artery in the patients and kidneys was 39.20% (98/250) and 22.80% (114/500), respectively. The incidence of early branch of the main renal artery and accessory renal artery was 9.60% (48/500) and 11.80% (59/500), respectively. No statistical difference of variation incidence was found between male and female, nor between left and right kidneys. The incidence of unilateral and bilateral variations on renal artery was 32.80% (82/250) and 6.40% (16/250), respectively, and the combinations of the latter were multiform. Conclusion Anatomical variations on renal artery can be showed clearly with 64-slice spiral CT angiography. Variations on bilateral renal artery are important to select the donor in case of renal transplantation.
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Objective To evaluate the value of multislice spiral CT in preoperative staging of bladder carcinoma.Methods Eighty-two patients(78 males and 4 females)with pathologically proved bladder carcinoma and the radiology materials were retrospectively analyzed.All the diagnosis results were compared with the results of surgical pathology.Results The location accuracy and qualitation accuracy in the diagnosis of bladder carcinoma with spiral CT WaS 78.0%(64/82)and 93.9%(77/82)respectively.Compared with the results of surgical pathology,the accuracy of judgement in bladder surrounding involvement,lymph node metastasis and surrounding organ involvement with CT was 90.2%(74/82),96.3%(79/82)and 89.0%(73/82),respectively.The CT staging of bladder carcinoma was positively correlated to that of surgical pathology.Conclusions Spiral CT has high value in the diagnosis of bladder carcinoma.It could be adopted as a conventional and main examination of bladder carcinoma before operation.