Isotropic CT Examination of Abdomen and Pelvis. Diagnostic Quality of Reformat

Kumaresan Sandrasegaran, Jonas Rydberg, Fatih Akisik, Tariq A. Hameed, Jeffrey W. Dunkle

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Rationale and Objectives: To evaluate the image quality of axial and coronal reformats obtained from isotropic resolution abdomino-pelvic computed tomography (CT) examinations. Materials and Methods: Thirty consecutive patients with intravenous contrast-enhanced abdomino-pelvic CT examinations (Brilliance 40, Philips Medical Systems, Cleveland, OH) were enrolled for the study. The raw data were reconstructed into two sets of source axial images: 0.9-mm slice widths with 0.45-mm reconstruction interval (isotropic resolution) and 4-mm slice widths with 3-mm reconstruction interval (anisotropic resolution: group A). Isotropic data set was reformatted into axial and coronal stacks (groups B and C, respectively) with 4-mm slice width and 3-mm interval. Three independent readers evaluated stacks A to C using a 3-point scale for resolution of hepatic vessels, edge sharpness of kidneys, respiratory motion artifact, reconstruction artifact, noise, and overall image quality. Results: There was no statistical difference among the groups A to C for vessel resolution, motion artifact, noise, and overall quality. The scores given to group C were significantly lower than those to groups A and B for reconstruction artifacts. There was no difference among groups A to C for overall impression of image quality. The interreader agreements were excellent for axial images (groups A and B) and moderate for coronal reformats. Conclusion: Isotropic scanning of the abdomen and pelvis allows creation of reformats with similar image quality as similar thickness axial source images. These reformats are of sufficient quality to form the basis of clinical interpretation.

Original languageEnglish (US)
Pages (from-to)1338-1343
Number of pages6
JournalAcademic radiology
Volume13
Issue number11
DOIs
StatePublished - Nov 1 2006

Keywords

  • computed tomography
  • image quality
  • Isotropic imaging
  • multiplanar reformation

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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