title: Comparison of accuracy and time-efficiency of CT colonography between conventional and panoramic 3D interpretation methods: an anthropomorphic phantom study.
abstract: OBJECTIVE
  To retrospectively compare the conventional three-dimensional (3D) interpretation method with the panoramic 3D method with regard to accuracy and time-efficiency in the detection of colonic polyps, using pig colonic phantoms as the standard of reference.
  
  
  METHODS
  One-hundred and sixty-two polyps were created in 18 pig colonic phantoms. CT colonography was performed with a 64-row detector CT scanner. Two-week interval reviews for the CTC image dataset with both the conventional and the panoramic 3D interpretation method were independently performed by three radiologists. The sensitivities of both methods were compared with the McNemar test. The mean interpretation time for each interpretation method was also assessed and compared with the Wilcoxon signed-rank test.
  
  
  RESULTS
  Compared with the conventional 3D method (0.96 for reader 1, 0.89 for reader 2, and 0.97 for reader 3), the panoramic method revealed comparable sensitivities (0.91 for reader 1, 0.86 for reader 2, and 0.93 for reader 3) (p>0.05). Interpretation time was significantly shorter with the panoramic method (115.1±32.7 s for reader 1, 229.7±72.2 s for reader 2, and 282.6±113.7 s for reader 3) than with the conventional method (218.9±59.9 s for reader 1, 379.4±117.0 s for reader 2, and 458.7±149.4 s for reader 3) for all readers (p<0.05).
  
  
  CONCLUSIONS
  Compared with the conventional 3D interpretation method, the panoramic 3D interpretation method shows improved time-efficiency and comparable sensitivity in the detection of colonic polyps.
authors.affiliation: Department of Radiology, Seoul Saint Mary's Hospital, The Catholic University of Korea, 505 Banpo-dong, Seocho-gu, Seoul, Republic of Korea. dumky@catholic.ac.kr
authors.forename: Joon-Il
authors.initials: JI
authors.lastname: Choi
authors.forename: Se Hyung
authors.initials: SH
authors.lastname: Kim
authors.forename: Seung Ho
authors.initials: SH
authors.lastname: Kim
authors.forename: Hee-Sun
authors.initials: HS
authors.lastname: Park
authors.forename: Jeong Min
authors.initials: JM
authors.lastname: Lee
authors.forename: Jae Young
authors.initials: JY
authors.lastname: Lee
authors.forename: Joon Koo
authors.initials: JK
authors.lastname: Han
authors.forename: Byung Ihn
authors.initials: BI
authors.lastname: Choi
mesh_terms: D000818:Animals; D003111:Colonic Polyps / Q000000981:diagnostic imaging*; D023881:Colonography, Computed Tomographic / Q000379:methods*; D004195:Disease Models, Animal; D021621:Imaging, Three-Dimensional; D019047:Phantoms, Imaging; D012189:Retrospective Studies; D012680:Sensitivity and Specificity; D018709:Statistics, Nonparametric; D013552:Swine