title: [A comparison between CT and SPECT in detecting mandibular invasion by lower gingival squamous cell carcinoma].
abstract: OBJECTIVE
  The purpose of this study is to compare the value of CT and SPECT in diagnosis of lower gingival carcinoma invading the mandible.
  
  
  METHODS
  From February 2002 to October 2006, twenty-one patients with lower gingival squamous cell carcinoma were enrolled.The data of CT and SPECT were studied,and compared with histopathological findings.
  
  
  RESULTS
  Among the 21 patients,the sensitivity, accuracy, negative predictive value and Youden's index of SPECT were 100.00%, 95.24%, 100.00% and 1.00,respectively. While the sensitivity, accuracy, negative predictive value and Youden's index of CT were 80.00%, 80.95%, 20.00% and 0.80, respectively. There were four false negatives assessments of bone invasion(80.00%) by CT scan, while no false negatives by SPECT.
  
  
  CONCLUSIONS
  SPECT is superior to CT, and can be used as a routine screening method to assess lower gingival carcinoma invading the mandible.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Hangzhou First People's Hospital, Hangzhou 310006, Zhejiang Province, China. dqybd@163.com
authors.forename: Qing-Yun
authors.initials: QY
authors.lastname: Duan
authors.forename: Mu-Yun
authors.initials: MY
authors.lastname: Jia
authors.forename: Xiong
authors.initials: X
authors.lastname: Zhang
authors.forename: Rong-Tao
authors.initials: RT
authors.lastname: Yuan
authors.forename: Ling-Xue
authors.initials: LX
authors.lastname: Bu
authors.forename: Wei
authors.initials: W
authors.lastname: Shang
authors.forename: Jie
authors.initials: J
authors.lastname: Zhao
authors.forename: Shu-Yao
authors.initials: SY
authors.lastname: Zuo
authors.forename: Xiao-Ming
authors.initials: XM
authors.lastname: Jin
authors.forename: Ning-Yi
authors.initials: NY
authors.lastname: Li
mesh_terms: D002294:Carcinoma, Squamous Cell / Q000473:pathology*; D005887:Gingival Neoplasms / Q000473:pathology*; D006801:Humans; D008334:Mandible; D009361:Neoplasm Invasiveness; D012680:Sensitivity and Specificity; D015899:Tomography, Emission-Computed, Single-Photon; D014057:Tomography, X-Ray Computed