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The early dynamic 18 F?FDG PET/CT can reflect perfusion, bio?distribution, uptake and excretion of 18 F?FDG in certain organs ( or lesions) in the early phase post injection. This imaging technique could be used to evaluate the organ ( or lesion) perfusion and to serve as a supplement for conventional 18 F?FDG PET/CT in the evaluation of glucose metabolism. This review summarizes the basic principle, imaging methods and clinical application of early dynamic 18 F?FDG PET/CT.
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Objective To investigate the value of high-resolution magnetic resonance imaging (HRMRI)in diagnosis of extramural vascular invasion (EMVI)of rectal cancer.Methods 33 patients with rectal cancer were reviewed preoperatively.The MRI findings of EMVI of all cases were scored and compared with the postoperative pathological results.Results The MRI EMVI scores were consistent with histopathology findings (k=0.324,P=0.039).The accuracy rate of MRI in diagnosis of EMVI was 66.7% (22/33).The MRI EMVI scores rose up with increased pT stage,meanwhile there was a high correlation between both (r=0.546).The percentage of MRI EMVI positive number was increased with elevated pT stage,and there was also a high correlation between both (r=0.469). ROC curve showed that MRI EMVI scoring was an effective method in diagnosis of rectal cancer EMVI (AUC=0.757).Conclusion HRMRI is a valuable method in diagnosis of EMVI of rectal cancer.
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Purpose Synchronous multiple primary esophageal carcinomas may be undetected by gastroscopy. This study aims to assess the role of 18F-fluorodeoxyglucose (18F-FDG) PET/CT in detecting synchronous multiple primary esophageal carcinomas. Materials and Methods Thirteen patients with synchronous multiple primary esophageal carcinoma who underwent gastroscopy and 18F-FDG PET/CT within two weeks before treatment were retrospectively analyzed. Results Gastroscopy and 18F-FDG PET/CT detected 22 and 29 esophageal carcinomatous foci respectively, and the difference was statistically significant (Z=-2.333, P<0.05). All the 29 esophageal carcinomatous foci showed high 18F-FDG uptake with a SUVmax ranging from 3.1 to 20.1 (mean, 10.7±5.7). 18F-FDG PET/CT also detected surrounding organ invasion in 3 patients, lymphatic metastasis in 10 patients and distant metastasis in 3 patients. Conclusion 18F-FDG PET/CT detects more esophageal carcinomatous foci compared with gastroscopy in patients with synchronous multiple primary esophageal carcinomas and also performs the staging diagnosis, which may help in improving clinical management and prognosis.