title: Interpretation of CT scans with PACS image display in stack mode.
abstract: OBJECTIVE
  To compare picture archiving and communication system (PACS) image display in so-called stack mode with conventional image display, tile mode, in efficacy of analysis of three-dimensional structure on computed tomographic (CT) scans.
  
  
  METHODS
  A complex three-dimensional phantom composed of 20 entangled tubes was constructed and scanned. The resultant images were transferred to a PACS for analysis. Five experienced CT radiologists were asked to unravel the tubes by identifying their ends and to perform this task in both stack and tile modes. The time taken and any errors were recorded.
  
  
  RESULTS
  All five radiologists performed considerably faster in stack mode than in tile mode; the speed varied by a factor of 3.2-5.7 times. The results of a paired t test showed this difference to be significant (P = .0002). Furthermore, no mistakes were made in stack mode, while two mistakes were made in tile mode.
  
  
  CONCLUSIONS
  Stack mode facilitates analysis of three-dimensional structure depicted on CT scans.
authors.affiliation: Department of Medical Imaging, Hammersmith Hospital, London, England.
authors.forename: A G
authors.initials: AG
authors.lastname: Mathie
authors.forename: N H
authors.initials: NH
authors.lastname: Strickland
mesh_terms: D019047:Phantoms, Imaging; D011873:Radiology Information Systems; D014057:Tomography, X-Ray Computed