title: Three-dimensional computed tomographic volumetry precisely predicts the postoperative pulmonary function.
abstract: OBJECTIVE
  It is important to accurately predict the patient's postoperative pulmonary function. The aim of this study was to compare the accuracy of predictions of the postoperative residual pulmonary function obtained with three-dimensional computed tomographic (3D-CT) volumetry with that of predictions obtained with the conventional segment-counting method.
  
  
  METHODS
  Fifty-three patients scheduled to undergo lung cancer resection, pulmonary function tests, and computed tomography were enrolled in this study. The postoperative residual pulmonary function was predicted based on the segment-counting and 3D-CT volumetry methods. The predicted postoperative values were compared with the results of postoperative pulmonary function tests.
  
  
  RESULTS
  Regarding the linear correlation coefficients between the predicted postoperative values and the measured values, those obtained using the 3D-CT volumetry method tended to be higher than those acquired using the segment-counting method. In addition, the variations between the predicted and measured values were smaller with the 3D-CT volumetry method than with the segment-counting method. These results were more obvious in COPD patients than in non-COPD patients.
  
  
  CONCLUSIONS
  Our findings suggested that the 3D-CT volumetry was able to predict the residual pulmonary function more accurately than the segment-counting method, especially in patients with COPD. This method might lead to the selection of appropriate candidates for surgery among patients with a marginal pulmonary function.
authors.affiliation: Department of Thoracic Surgery, Division of Clinical Medicine, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8575, Japan.
authors.forename: Keisuke
authors.initials: K
authors.lastname: Kobayashi
authors.affiliation: Department of Thoracic Surgery, Division of Clinical Medicine, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8575, Japan.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Saeki
authors.affiliation: Department of Thoracic Surgery, Division of Clinical Medicine, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8575, Japan.
authors.forename: Shinsuke
authors.initials: S
authors.lastname: Kitazawa
authors.affiliation: Department of Thoracic Surgery, Division of Clinical Medicine, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8575, Japan.
authors.forename: Naohiro
authors.initials: N
authors.lastname: Kobayashi
authors.affiliation: Department of Thoracic Surgery, Division of Clinical Medicine, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8575, Japan.
authors.forename: Shinji
authors.initials: S
authors.lastname: Kikuchi
authors.affiliation: Department of Thoracic Surgery, Division of Clinical Medicine, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8575, Japan.
authors.forename: Yukinobu
authors.initials: Y
authors.lastname: Goto
authors.affiliation: Department of Thoracic Surgery, Division of Clinical Medicine, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8575, Japan.
authors.forename: Mitsuaki
authors.initials: M
authors.lastname: Sakai
authors.affiliation: Department of Thoracic Surgery, Division of Clinical Medicine, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8575, Japan. ysato@md.tsukuba.ac.jp.
authors.forename: Yukio
authors.initials: Y
authors.lastname: Sato
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008168:Lung / Q000000981:diagnostic imaging* / Q000473:pathology / Q000503:physiopathology*; D008175:Lung Neoplasms / Q000150:complications / Q000000981:diagnostic imaging* / Q000473:pathology / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D009929:Organ Size; D011184:Postoperative Period; D011237:Predictive Value of Tests; D029424:Pulmonary Disease, Chronic Obstructive / Q000150:complications / Q000000981:diagnostic imaging / Q000503:physiopathology; D012129:Respiratory Function Tests / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000379:methods*
keywords: Chronic obstructive pulmonary disease; Residual pulmonary function; Segment-counting method; Three-dimensional computed tomographic volumetry