18F-FDG PET显像在胰腺癌诊断中的临床应用

目的：探讨^18F-FDG PET显像在胰腺癌诊断中的应用价值。方法：54例临床怀疑为胰腺癌的患者均行^18F-FDG PET显像,对显像结果进行目测法及半定量分析,并与CT、手术、腹腔镜取病理等进行对比研究。结果：^18F-FDG PET显像对胰腺癌诊断的敏感度为93％(38／41),特异度为85g(11／13)。CT对胰腺癌诊断的敏感度为76N(31／41),特异度为69％(9／13)。^18F-FDG PET显像发现7例CT检查未能确定的肝、肺及淋巴结转移,同时PET诊断结果使15例(28％)患者的临床治疗方案得到修正。结论：^18F-FDG PET显像对胰腺癌的诊断及临床分期具有较好的临床应用价值。     

SPECT/CT骨显像骶椎“H”征及其变异对衰竭骨折的诊断价值

目的 :探讨SPECT/CT骨显像的骶椎"H"征及其变异对衰竭骨折的诊断价值,提高对其影像学特征的认识和鉴别诊断水平。方法:选择45例临床怀疑骶椎衰竭骨折行SPECT全身骨显像及骨盆SPECT/CT融合显像患者,分析骶椎"H"征及其变异对衰竭骨折的诊断价值。结果:45例中衰竭骨折41例,其中32例累及骶椎;余4例为恶性骨肿瘤。14例骶椎表现为"H"征,23例为"H"征变异。"H"征对骶椎衰竭骨折的诊断敏感度、特异度、阳性预测值及阴性预测值分别是43.75%(14/32)、100.00%(13/13)、100.00%(14/14)、41.94%(13/31)。"H"征及其变异对骶椎衰竭骨折的诊断敏感度、特异度、阳性预测值及阴性预测值分别是100.00%(32/32)、61.54%(8/13)、86.49%(32/37)、100.00%(8/8)。32例骶椎衰竭骨折合并其他部位的骨折依次是耻骨53.12%(17/32)、椎体28.12%(9/32)、肋骨15.62%(5/32)。结论:全身骨显像的骶椎"H"征及其变异对骶椎衰竭骨折的诊断具有一定提示作用,结合SPECT/CT断层图像融合可准确诊断。     

~(18)F-脱氧葡萄糖PET/CT与增强CT在胰腺癌鉴别诊断中应用价值

目的探讨~(18)F-脱氧葡萄糖(~(18)F-FDG)正电子发射计算机断层显像(PET)、增强CT在胰腺癌鉴别诊断中的应用价值。方法选取自2011年5月至2016年8月沈阳军区总医院收治的经B超、CT、核磁共振成像(MRI)以及临床综合资料证实为胰腺占位性病变的56例患者为研究对象。对所有56例患者行~(18)F-FDG PET/CT全身检查及增强CT检查。比较单纯~(18)F-FDG PET/CT、增强CT显像及两种显像方法联合应用对胰腺良恶性肿瘤诊断的灵敏度、特异度、阳性预测值、阴性预测值及准确率等,以及与最终诊断的一致性。结果本组56例胰腺病变患者中,胰腺癌38例,良性病变18例。~(18)F-FDG PET/CT对胰腺癌诊断的灵敏度、特异度、阳性预测值、阴性预测值及准确率分别为88.3%、80.2%、93.0%、82.7%及85.6%;增强CT诊断的灵敏度、特异度、阳性预测值、阴性预测值及准确率分别为74.1%、68.6%、80.9%、63.2%、72.6%,~(18)F-FDG PET/CT的诊断效能均高于增强CT。PET/CT联合增强CT对胰腺病变诊断的灵敏度为100.0%,特异度为90.9%,准确率为95.2%。~(18)F-FDG PET/CT与最终诊断具有较高的一致性(k=0.705),增强CT的诊断结果与最终诊断结果中度一致(k=0.409),两者联合具有极好的一致性(k=0.816)。结论~(18)F-FDG PET/CT对胰腺癌的诊断具有较高的灵敏度及特异性,~(18)F-FDG PET/CT联合增强CT可以明显提高诊断的灵敏度、特异性及准确率。     

18F-FDG PET显像在肝细胞癌介入治疗后残留病灶检出中的应用

目的　探讨1 8F 脱氧葡萄糖 (FDG)PET显像对肝细胞癌介入治疗后残留病灶的诊断价值。方法　经穿刺活组织检查或手术病理检查证实的肝细胞癌患者 35例 ,回顾性分析经导管动脉化疗栓塞术 (TACE)后 1 5～ 2个月1 8F FDGPET显像对肝内肿瘤残留病灶的检出结果 ,并与同期平扫和增强碘油CT对比 ,以动脉造影和临床随访 6个月以上及部分病理检查结果为标准。结果　 35例患者共 5 2个病灶 ,经动脉造影和临床随访 6个月以上及部分病理检查结果证实 ,有肿瘤残留病灶 31个 ,1 8F FDGPET显像检出 2 8个 ,碘油CT检出 19个 ;无肿瘤残留病灶 2 1个 ,1 8F FDGPET显像检出 2 0个 ,碘油CT检出 2 0个。1 8F FDGPET显像诊断肝癌介入治疗后肿瘤残留病灶的灵敏度和准确性 (分别为 90 3%、92 3% )明显高于碘油CT(分别为 6 1 3%、75 0 % ) ,差异有显著性 (P <0 0 1)。结论　1 8F FDGPET显像对检出肝细胞癌介入治疗后肿瘤残余病灶有优势 ,特别对碘油CT难以检出的残留病灶有临床价值 ,可为确定临床治疗方案提供依据。     

~(18)F-FDG-PET/CT显像在胰腺炎和胰腺癌鉴别诊断中的应用

目的探讨~(18)F-FDG-PET/CT显像在鉴别诊断胰腺癌良恶性病变中的价值。方法选取我院2014年1月～2017年1月确诊的胰腺癌患者53例(恶性组)、慢性胰腺炎患者22(良性组),两组患者均接受了~(18)F-FDG-PET/CT显像检测,对比两组患者病灶早期、延迟期的最大标准摄取值(SUV),滞留指数(RI),并绘制受试者工作曲线(ROC)求取早期SUV、RI鉴别诊断胰腺癌的最佳临界值及对应的诊断学指标。结果恶性组的~(18)F-FDG-PET/CT显像早期SUV测定值、延迟期SUV测定值、RI值均显著的高于良性组患者,差异具有统计学意义(P 0. 05);当选取早期SUV的临界值为3. 07时,~(18)F-FDG-PET/CT显像诊断灵敏度为78. 82%、特异度为86. 14%、漏诊率为21. 18%、误诊率为13. 86%、AUC值为0. 846;当选取RI的临界值为14. 46时,~(18)F-FDG-PET/CT显像诊断灵敏度为87. 64%、特异度为95. 20%、漏诊率为12. 36%、误诊率为4. 80%、AUC值为0. 911。结论~(18)F-FDG-PET/CT显像在鉴别诊断胰腺癌良恶性病变中具有较高的临床实用价值。     

18F-FDG PET显像诊断原发性鼻咽癌的价值

目的　探讨18F 脱氧葡萄糖 (FDG)PET显像对原发性鼻咽癌的诊断价值。方法　对 51例受检者行18F FDGPET显像 ,其中 3 1例行病理组织学检查 ,最后诊断根据病理组织学检查结果和临床随访。结果　18F FDGPET显像诊断原发性鼻咽癌的灵敏度为 96.0 0 % ,特异性为 76 92 % ,阳性预测值为 80 .0 0 % ,阴性预测值为 95 2 4% ,准确性为 86 2 7%。鼻咽癌、鼻咽炎症和无鼻咽病变组标准摄取值 (SUV)均值比较 ,3组间差异有显著性 (F =2 1 3 0 ,P <0 0 1)。结论　18F FDGPET显像诊断原发性鼻咽癌具有高灵敏度和高阴性预测值     

18F-FDG PET与99Tcm- MDP显像诊断肿瘤骨转移的比较

目的　研究1 8F 脱氧葡萄糖 (FDG)PET显像对肿瘤骨转移的诊断价值 ,并与99Tcm 亚甲基二膦酸盐 (MDP)骨显像比较。方法　 4 3例确诊的肿瘤患者在 1个月内先后行1 8F FDGPET及99Tcm MDP骨显像 ,其中 2 4例经其他检查及随访证实为骨转移。对比分析 2种显像结果。结果　 2 4例骨转移患者FDGPET显像均为阳性 ,骨显像阳性 2 2例 ,灵敏度分别为 10 0 %和 91.7% ,差异无显著性 (P >0 0 5 )。19例无骨转移患者中FDGPET显像阴性 18例 ,骨显像阴性 11例 ,特异性分别为 94 .7%和5 7 9% ,差异有显著性 (P <0 0 5 )。 2种方法检测骨转移的准确性分别为 97.7%和 76 .7% ,差异有显著性 (P <0 0 5 )。结论　1 8F FDGPET显像诊断肿瘤骨转移的灵敏度与99Tcm MDP骨显像无明显差别 ,但有更高的特异性和准确性。     

18F-FDG PET显像在健康查体中的意义

目的 :探讨18F FDGPET在健康查体中的应用价值。材料和方法 :回顾性分析以健康查体为目的行18F FDGPET检查者 3 67人的资料 ,定性与半定量法 (SUV值 )分析PET图像 ,并与随访结果比较。结果 :PET显像阴性者 2 60例 (70 .8% ) ;阳性者 10 7例 (2 9.2 % ) ,其中良性病变 99例 (2 7.0 % ) ,恶性病变 8例 (2 .2 % )。结论 :18F FDGPET显像在正常健康查体中可以发挥重要的临床意义。     

18F-FLTPET／CT显像在鼻咽癌诊断及分期中的应用

目的探讨18F—FLTPET／CT显像在鼻咽癌诊断、分期和预后中的临床价值。方法13例鼻咽癌患者行18F—FLTPET／CT显像,其中1例患者也行18F-FDGPET／CT显像。通过软件自动获得病灶ROI的SUVmax和SUVmean。分析18F—FLTPET／CT显像病灶SUV与病理类型、分期及预后的关系,并进行1例患者的18F—FLT和“F—FDGPET／CT显像对比。结果13例鼻咽癌患者鼻咽部位高摄取18F—FLt灶22处,SUVmax为6．04±3．61,SUVmean。为5．09±2．89;淋巴结转移灶26处,SUVmax。为5．56±3．11,SUVmean。为4．65±2．79。18F＋Fu显像中鼻咽癌原发灶及淋巴结转移灶均能清晰显影。行2种显像的1例患者所有病灶18F—FLT显像的SUV较18F—FDG显像低：1处原发灶SUVmax分别为8．32和4．38,2处淋巴结转移灶SUVmax为3．30±0．07和1．48±0．06。13例鼻咽癌患者的TNM分期在进行18F—FLTPET／CT显像后有3例发生了改变。结论”F—FLTPET／CT显像能清晰显示鼻咽癌原发病灶及转移病灶,对确定患者TNM分期有临床应用价值。     

^18F-FDG PET／CT在胰腺癌诊断中的价值

目的评价^18F-脱氧葡萄糖（FDG）PET／CT鉴别诊断胰腺良恶性病变及检测淋巴结和（或）远处转移的价值。方法回顾性分析上海交通大学医学院附属仁济医院行^18F—FDGPET／CT检查的46例临床疑胰腺肿瘤患者的影像学检查资料和临床资料,其中胰腺癌患者26例,良性病变者20例,比较分析PET和CT的特征。结果当选择最大标准摄取值（SUVmax）=2．95为判断良恶性的界值时,对胰腺癌诊断的灵敏度是88．5％（23／26）,特异性是85．0％（17／20）。^18F—FDGPET／CT显像假阳性3例,假阴性3例。同时发现16例检查前未确定的肝、肺、骨及淋巴结转移患者。根据显像结果,11例患者治疗方案得以修正。结论根据现有资料分析,^18F—FDGPET／CT是鉴别诊断胰腺良恶性病变及检测胰腺癌患者淋巴结和（或）远处转移一种较好的方法。     

Evaluation of head and neck cancer with 18F-FDG PET: a comparison with conventional methods

The aim of this study was to evaluate the usefulness of 18F-FDG PET in the diagnosis and staging of primary and recurrent malignant head and neck tumours in comparison with conventional imaging methods [including ultrasonography, radiography, computed tomography (CT) and magnetic resonance imaging (MRI)], physical examination, panendoscopy and biopsies in clinical routine. A total of 54 patients (13 female, 41 male, age 61.3+/-12 years) were investigated retrospectively. Three groups were formed. In group I, 18F-FDG PET was performed in 15 patients to detect unknown primary cancers. In group II, 24 studies were obtained for preoperative staging of proven head and neck cancer. In group III, 18F-FDG PET was used in 15 patients to monitor tumour recurrence after radiotherapy and/or chemotherapy. In all patients, imaging was obtained at 70 min after the intravenous administration of 180 MBq 18F-FDG. In 11 of the 15 patients in group I, the primary cancer could be found with 18F-FDG, yielding a detection rate of 73.3%. In 4 of the 15 patients, CT findings were also suggestive of the primary cancer but were nonetheless equivocal. In these patients, 18F-FDG showed increased 18F-FDG uptake by the primary tumour, which was confirmed by histology. One patient had recurrence of breast carcinoma that could not be detected with 18F-FDG PET, but was detected by CT. In three cases, the primary cancer could not be found with any imaging method. Among the 24 patients in group II investigated for staging purposes, 18F-FDG PET detected a total of 13 local and three distant lymph node metastases, whereas the conventional imaging methods detected only nine local and one distant lymph node metastases. The results of 18F-FDG PET led to an upstaging in 5/24 (20.8%) patients. The conventional imaging methods were false positive in 5/24 (20.8%). There was one false positive result using 18F-FDG PET. Among the 15 patients of group III with suspected recurrence after radiotherapy and/or chemotherapy, 18F-FDG was true positive in 7/15 (46.6%) and true negative in 4/15 (26.6%). The conventional imaging methods were true positive in 5/15 (33.3%) and true negative in 4/15 (26.6%). One false negative (6.6%) and three false positive findings (20%) on 18F-FDG PET were due to inflamed tissue. The conventional imaging methods were false positive in three (20%) and false negative in three cases (20%). It is concluded that in comparison to conventional diagnostic methods, 18F-FDG PET provides additional and clinically relevant information in the detection of primary and metastatic carcinomas as well as in the early detection of recurrent or persistent head and neck cancer after radiotherapy and/or chemotherapy. 18F-FDG PET should therefore be performed early in clinical routine, usually before CT or MRI.     

18F-氟乙基胆碱对前列腺癌PET/CT诊断的价值及其非前列腺癌相关摄取的研究

目的 探讨18F-氟乙基胆碱(FECH) PET/CT在前列腺癌诊断中的价值,并分析前列腺癌患者的18F-FECH生理性摄取和其他非前列腺癌相关的摄取.方法 回顾性分析2009年10月至2011年12月共30例行18F-FECH和18F-FDG PET/CT的前列腺癌患者[年龄56～83(平均61)岁],比较两者对前列腺癌原发灶诊断的灵敏度及准确性.测量并分析器官18F-FECH生理性摄取及非前列腺癌病灶摄取的SUVmax.对数据行x2检验和t检验.结果 30例患者中PET/CT共发现41个前列腺异常摄取灶.18F-FECH和18F-FDG显像对前列腺癌原发灶诊断灵敏度分别为87.9％(29/33)和36.4％(12/33;x2=8.1,P＜0.05),准确性分别为82.9％(34/41)和36.6％(15/41;x2=11.1,P＜0.05).肝脏、胰腺、脾脏、唾液腺可见18F-FECH生理性摄取,其中肝脏、胰腺生理性摄取最高,SUVmax分别为10.1±1.6和6.1±1.1.18F-FECH主要经肾脏排泄,泌尿系统可见放射性分布.18F-FECH PET/CT显像前列腺癌与前列腺良性病灶的SUVmax分别为6.0±2.2和2.6±1.3,差异有统计学意义(t=2.9,P＜0.05).30例患者中,发现10例有前列腺以外组织器官的非前列腺癌相关的PET异常表现,占33.3％,其中6例为炎性反应,1例为淋巴瘤,1例为结核,1例为肺癌,1例为松果体生殖细胞瘤.结论 18F-FECH显像在前列腺癌的诊断中有较高价值.准确分析患者生理性摄取及非前列腺癌相关病灶的摄取对前列腺癌的诊断至关重要,造成18F-FECH假阳性的良性病变主要是炎性反应.     

Is 18F-FDG PET/CT useful for imaging and management of patients with suspected occult recurrence of cancer?

Rising serum tumor markers may be associated with negative imaging in the presence of cancer. CT and (18)F-FDG PET may yield incongruent results in the assessment of tumor recurrence. The present study evaluates the incremental role of (18)F-FDG PET/CT for the diagnosis and management of cancer patients with increasing levels of tumor markers as the sole indicator of potential recurrence after initial successful treatment. METHODS: Thirty-six cancer patients with increasing levels of tumor markers during follow-up and negative CT underwent (18)F-FDG PET/CT, which showed 111 sites of increased tracer uptake. PET/CT was compared with PET results on a site-based analysis for characterization of (18)F-FDG foci and on a patient-based analysis for diagnosis of recurrence. The clinical impact of PET/CT on further patient management was evaluated. RESULTS: Thirty patients (83%) had recurrence in 85 malignant sites (77%). For the site-based analysis, PET had a sensitivity, specificity, accuracy, positive predictive value, and negative predictive value of 96%, 50%, 85%, 85%, and 82%, respectively, as compared with the performance indices of PET/CT of 100%, 89%, 97%, 97%, and 100%, respectively. There was a statistically significant difference between the specificity (P < 0.05) and accuracy (P < 0.001) of PET and PET/CT for precise characterization of suspected lesions. For the patient-based analysis, PET had a sensitivity, specificity, and accuracy of 93%, 50%, and 86%, respectively, as compared with PET/CT with values of 93%, 67%, and 89%, respectively (P = not significant). PET/CT was the single modality that directed further management and treatment planning in 12 patients (33%). CONCLUSION: The results of this study indicate that PET/CT may improve the accuracy of occult cancer detection and further lead to management changes in patients with increasing levels of tumor markers as the sole suspicion of recurrent malignancy.     

18F-FDG PET/CT in patients with suspected recurrent or metastatic well-differentiated thyroid cancer.

PET using 18F-FDG has been shown to effectively detect various types of cancer by their increased glucose metabolism. The aim of this study was to evaluate the use of coregistered PET and CT (PET/CT) in patients with suspected thyroid cancer recurrence. METHODS: After total thyroidectomy followed by radioiodine ablation, 61 consecutive patients with elevated thyroglobulin levels or a clinical suspicion of recurrent disease underwent 18F-FDG PET/CT. Of these, 59 patients had negative findings on radioiodine (131I) whole-body scintigraphy (WBS). Fifty-three of the 61 patients had both negative 131I WBS findings and elevated thyroglobulin levels. PET/CT images were acquired 60 min after intravenous injection of 400-610 MBq of 18F-FDG using a combined PET/CT scanner. Any increased 18F-FDG uptake was compared with the coregistered CT image to differentiate physiologic from pathologic tracer uptake. 18F-FDG PET/CT findings were correlated with the findings of histology, postradioiodine WBS, ultrasound, or clinical follow-up serving as a reference. The diagnostic accuracy of 18F-FDG PET/CT was evaluated for the entire patient group and for those patients with serum thyroglobulin levels of less than 5, 5-10, and more than 10 ng/mL. RESULTS: Thirty patients had positive findings on 18F-FDG PET/CT; 26 were true-positive and 4 were false-positive. In 2 patients, increased 18F-FDG uptake identified a second primary malignancy. 18F-FDG PET/CT results were true-negative in 19 patients and false-negative in 12 patients. The overall sensitivity, specificity, and accuracy of 18F-FDG PET/CT were 68.4%, 82.4%, and 73.8%, respectively. The sensitivities of 18F-FDG PET/CT at serum thyroglobulin levels of less than 5, 5-10, and more than 10 ng/mL were 60%, 63%, and 72%, respectively. Clinical management changed for 27 (44%) of 61 patients, including surgery, radiation therapy, or chemotherapy. CONCLUSION: Coregistered 18F-FDG PET/CT can provide precise anatomic localization of recurrent or metastatic thyroid carcinoma, leading to improved diagnostic accuracy, and can guide therapeutic management. In addition, the findings of this study suggest that further assessment of 131I WBS-negative, thyroglobulin-positive patients by 18F-FDG PET/CT may aid in the clinical management of selected cases regardless of the thyroglobulin level.     

Detection of Richter's transformation of chronic lymphocytic leukemia by PET/CT.

Our objective was to evaluate the accuracy of PET/CT for the diagnosis of Richter's transformation of chronic lymphocytic leukemia (CLL) to diffuse large cell lymphoma. METHODS: A retrospective study was performed of 37 patients with CLL who underwent 18F-FDG PET/CT at our institution between March 2003 and July 2005. All PET/CT scans were reviewed in consensus by 2 diagnostic radiologists. Sites of abnormal 18F-FDG uptake with a maximum standardized uptake value (SUVmax) of greater than 5 were considered highly suggestive of Richter's transformation. The PET/CT findings were correlated with histologic findings from bone marrow or lymph node biopsy performed within 6 wk of PET/CT and with clinical follow-up. RESULTS: The 37 patients (26 men and 11 women; mean age, 61 y, range, 40-82 y) underwent 57 PET/CT scans. In 10 (91%) of 11 patients with Richter's transformation, PET/CT detected sites of abnormal 18F-FDG uptake having an SUVmax of greater than 5. Richter's transformation was missed in 1 patient who had only low-grade 18F-FDG uptake (SUVmax < 5). Nine patients had false-positive PET/CT findings; in 3 of these patients, alternative malignancies were diagnosed (Hodgkin's disease; metastatic neuroendocrine carcinoma; non-small cell lung cancer). In all remaining patients, PET/CT correctly excluded Richter's transformation. For the specific diagnosis of Richter's transformation of CLL to diffuse large B-cell lymphoma, PET/CT had overall sensitivity, specificity, and positive and negative predictive values of 91%, 80%, and 53% and 97%, respectively. CONCLUSION: PET/CT can detect Richter's transformation of CLL to diffuse large B-cell lymphoma with a high sensitivity and a high negative predictive value.     

Diagnostic accuracy of 18F-FDG PET/CT in characterizing ovarian lesions and staging ovarian cancer: correlation with transvaginal ultrasonography, computed tomography, and histology

AIMS: To (a) assess the accuracy of 18F-FDG PET/CT in distinguishing malignant from benign pelvic lesions, compared to transvaginal ultrasonography (TVUS) and (b) to establish the role of whole-body 18F-FDG PET/CT, compared to contrast enhanced computed tomography (CT), in staging patients with ovarian cancer. PATIENTS: Fifty consecutive patients with a pelvic lesion, already scheduled for surgery on the basis of physical examination, TVUS, and serum Ca125 levels, were enrolled in the study. Patients' age ranged between 23 and 89 years (mean 64). All patients underwent TVUS including a colour Doppler study followed by a thorax and abdominal CT scan, and whole-body 18F-FDG PET/CT within 2 weeks prior to surgery. Histological findings obtained at surgery were taken as the 'gold standard' to compare 18F-FDG PET/CT and TVUS, and 18F-FDG PET/CT vs. CT. When tissue analysis showed ovarian cancer, the accuracy of 18F-FDG PET/CT and CT were compared for the purpose of obtaining a precise staging. RESULTS: At surgery, the ovarian lesions were malignant in 32/50 patients (64%) and benign in the remaining 18/50 patients (36%). The sensitivity, specificity, NPV, PPV and accuracy of 18F-FDG PET/CT were 87%, 100%, 81%, 100% and 92%, respectively, compared with 90%, 61%, 78%, 80% and 80%, respectively, for TVUS. In staging ovarian cancer, 18F-FDG PET/CT results were concordant with final pathological staging in 22/32 (69%) patients while CT results were concordant in 17/32 (53%) patients. CT incorrectly down-staged four out of six stage IV patients by missing distant metastasis in the liver, pleura, mediastinum, and in left supraclavicular lymph nodes, which were correctly detected by 18F-FDG PET/CT. CONCLUSION: PET/CT with 18F-FDG provides additional value to TVUS for the differential diagnosis of benign from malignant pelvic lesions, and to CT for the staging of ovarian cancer patients.     

Clinical performance of PET/CT in evaluation of cancer: additional value for diagnostic imaging and patient management.

This study assessed the clinical performance of a combined PET/CT system using (18)F-FDG in oncologic patients. METHODS: (18)F-FDG PET/CT was used to evaluate 204 patients with 586 suspicious lesions. All patients had available follow-up data, enabling assessment of the clinical significance of hybrid PET/CT findings. Differences in interpretation between PET, CT, and fused PET/CT data were prospectively documented for detection, localization, and characterization of each evaluated site. The additional value of PET/CT for data interpretation over that of separate PET and CT was classified into several criteria, including change in lesion characterization to either definitely benign or definitely malignant, precise anatomic localization of malignant (18)F-FDG uptake, and retrospective lesion detection on PET and CT. The clinical impact of information provided by PET/CT on patient management was assessed on the basis of follow-up data concerning further diagnostic or therapeutic approach. Analysis of data was performed for the whole study population, for different types of cancer, and for different anatomic sites. RESULTS: PET/CT provided additional information over the separate interpretation of PET and CT in 99 patients (49%) with 178 sites (30%). PET/CT improved characterization of equivocal lesions as definitely benign in 10% of sites and as definitely malignant in 5% of sites. It precisely defined the anatomic location of malignant (18)F-FDG uptake in 6%, and it led to retrospective lesion detection on PET or CT in 8%. The results of PET/CT had an impact on the management of 28 patients (14%). Hybrid PET/CT data obviated the need for further evaluation in 5 patients, guided further diagnostic procedures in 7 patients, and assisted in planning therapy for 16 patients. CONCLUSION: Hybrid PET/CT improves the diagnostic interpretation of (18)F-FDG PET and CT in cancer patients and has an impact on both diagnostic and therapeutic aspects of patient management.     

18F-FDG PET/CT在不明原发灶肿瘤中的临床应用价值

目的探讨18F-FDG PET/CT全身显像在不明原发灶肿瘤（CUP）诊断中的临床应用价值。方法回顾分析46例于2015年2月至2016年6月在我院行常规检查未能发现肿瘤原发灶而进一步行18F-FDG PET/CT全身显像查找肿瘤原发灶的转移性肿瘤患者的资料。PET/CT图像分析采用视觉及半定量分析方法。通过病理活检和（或）临床综合诊断、临床随访对结果进行评价。结果46例患者中,18F-FDG PET/CT显像找到原发肿瘤33例,均经过病理活检及临床随访证实;13例未发现原发病灶。18F-FDG PET/CT对不明肿瘤原发灶的检出率为71.7%（33/46）,其中阳性患者中淋巴瘤3例、胃癌2例、食管癌4例、卵巢癌3例、肺癌14例、肝癌2例、尿路上皮癌1例、鼻咽癌2例、多发性骨髓瘤1例、降结肠癌1例。转移方式主要有淋巴结转移32例、骨转移20例、肝转移13例、肺转移9例、胸膜腹膜转移5例、肾上腺转移3例、脑转移4例、皮下转移3例、心包膜转移1例。结论18F-FDG PET/CT全身显像对CUP的检出率显著优于一般常规检查,对临床指导治疗有着重要意义。     

18F-FDG PET/CT全身显像在原发灶不明转移癌中的临床应用

目的 探讨18F-脱氧葡萄糖(FDG)PET/CT全身显像在原发灶不明转移癌(CUP)诊断中的临床应用价值.方法 回顾性分析2006年1月至2007年6月2589例18F-FDG PET/CT显像患者中169例CUP患者的显像结果,通过分析病历记录、病理检查结果及临床随访确定最终原发灶诊断结果.结果 169例CUP患者中19例失访,150例有完整资料.70例成功探测到原发灶,总检出率为46.7%(70/150),其中52例得到病理检查证实,18例为临床诊断;肺癌38例,占54.3%,鼻咽癌8例,占11.4%,消化系统肿瘤13例,占18.6%,其他肿瘤11例,占15.7%.3例临床怀疑转移瘤,18F-FDG PET/CT未见明显恶性征象,经随访证实为良性病变.6例PET/CT诊断错误.15例患者没有确诊.56例未探测到原发灶,其中3例在随访过程中得到确诊,分别为鼻咽癌、膀胱癌、食管癌各1例.结论 18F-FDG PET/CT全身显像对诊断CUP具有重要临床价值.