title: [Application of 18F-FDG PET/CT scan in following-up of nasopharyngeal carcinoma after radiotherapy].
abstract: OBJECTIVE
  Local relapse,tumor residue, and whole body metastases of nasopharyngeal carcinoma (NPC) after radiotherapy were mainly confirmed by CT, MRI, SPE/CT, and PET examinations. This study was to discuss the value of F-18-fluoro-2-deoxy-d-glucose positron emission tomography/computed tomography (PET/CT) in detecting suspected recurrence or tumor residue, and whole body metastases of NPC after radiotherapy.
  
  
  METHODS
  PET/CT were performed on 38 NPC patients 3-36 months after radiotherapy. The images of PET/CT, CT, and PET were observed. PET standardized uptake value (SUV) was calculated, and SUV of > 2.5 was considered as positive. The Patients were divided into 4 groups by diagnosis: (1) no recurrence/residue, and no whole body metastases; (2) with recurrence/residue, but no whole body metastases; (3) no recurrence/residue, but with whole body metastases; (4) with both recurrence/residue and whole body metastases. Diagnoses of all patients were referred to the proved follow-up clinical information. The following-up time was 6-10 months.
  
  
  RESULTS
  The sensitivity, and specificity of PET/CT (100%,and 89.5%) were better than that of CT alone (77.8%, and 84.2%), a litter better than that of PET alone (100%, and 80.0%).
  
  
  CONCLUSIONS
  FDG-PET scan is a better tool than CT alone for the detection of recurrene or residue, and whole body metastases of NPC, a litter better than PET alone. PET/CT may provide valuable information for judging whether the focus is metastasis.
authors.affiliation: Department of Radiology, Zhejiang provincial corps hospital, Chinese people's armed police force, Jiaxing, Zhejiang, 314000, P.R.China.
authors.forename: Dang-Fan
authors.initials: DF
authors.lastname: Yu
authors.forename: Chuan-Tao
authors.initials: CT
authors.lastname: Zuo
authors.forename: Jia-Zhong
authors.initials: JZ
authors.lastname: Dai
authors.forename: Meng-Jie
authors.initials: MJ
authors.lastname: Dong
authors.forename: Jun
authors.initials: J
authors.lastname: Zhao
authors.forename: Xiang-Tong
authors.initials: XT
authors.lastname: Lin
authors.forename: Yi-Hui
authors.initials: YH
authors.lastname: Guan
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D019788:Fluorodeoxyglucose F18; D005500:Follow-Up Studies; D006801:Humans; D008113:Liver Neoplasms / Q000000981:diagnostic imaging / Q000556:secondary; D008175:Lung Neoplasms / Q000000981:diagnostic imaging / Q000556:secondary; D008297:Male; D008875:Middle Aged; D009303:Nasopharyngeal Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology / Q000532:radiotherapy*; D009364:Neoplasm Recurrence, Local / Q000000981:diagnostic imaging*; D018365:Neoplasm, Residual; D049268:Positron-Emission Tomography; D019275:Radiopharmaceuticals; D014057:Tomography, X-Ray Computed
chemical_list: D019275:Radiopharmaceuticals; D019788:Fluorodeoxyglucose F18