Three-dimensional volumetric display of ct data: Effect of scan parameters upon image quality

Derek R. Ney, Elliot K. Fishman, Donna Magid, Douglas D. Robertson, Akira Kawashima

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

Of the many steps involved in producing high quality three- dimensional (3D) images of CT data, the data acquisition step is of greatest consequence. The principle of “garbage in, garbage out” applies to 3D imaging-bad scanning technique produces equally bad 3D images. We present a formal study of the effect of two basic scanning parameters, slice thickness and slice spacing, on image quality. Three standard test objects were studied using variable CT scanning parameters. The objects chosen were a bone phantom, a cadaver femur with a simulated 5 mm fracture gap, and a cadaver femur with a simulated 1 mm fracture gap. Each object was scanned at three collimations: 8, 4, and 2 mm. For each collimation, four sets of scans were performed using four slice intervals: 8, 4, 3, and 2 mm. The bone phantom was scanned in two positions: Oriented perpendicular to the scanning plane and oriented 45° from the scanning plane. Three-dimensional images of the resulting 48 sets of data were produced using volumetric rendering. Blind review of the resultant 48 data sets was performed by three reviewers rating five factors for each image. The images resulting from scans with thin collimation and small table increments proved to rate the highest in all areas. The data obtained using 2 mm slice intervals proved to rate the highest in perceived image quality. Three millimeter slice spacing with 4 mm collimation, which clinically provides a good compromise between image quality and acquisition time and dose, also produced good perceived image quality. The studies with 8 mm slice intervals provided the least detail and introduced the worst inaccuracies and artifacts and were not suitable for clinical use. Statistical analysis demonstrated that slice interval (i.e., table incrementation) was of primary importance and slice collimation was of secondary, although significant, importance in determining perceived 3D image quality.

Original languageEnglish (US)
Pages (from-to)875-885
Number of pages11
JournalJournal of Computer Assisted Tomography
Volume15
Issue number5
DOIs
StatePublished - Jan 1 1991
Externally publishedYes

Fingerprint

Data Display
Three-Dimensional Imaging
Cadaver
Femur
Bone and Bones
Artifacts
Datasets

Keywords

  • Computed tomography
  • Computed tomography
  • Image quality
  • Techniques
  • Three dimensional

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

Cite this

Three-dimensional volumetric display of ct data : Effect of scan parameters upon image quality. / Ney, Derek R.; Fishman, Elliot K.; Magid, Donna; Robertson, Douglas D.; Kawashima, Akira.

In: Journal of Computer Assisted Tomography, Vol. 15, No. 5, 01.01.1991, p. 875-885.

Research output: Contribution to journalArticle

Ney, Derek R. ; Fishman, Elliot K. ; Magid, Donna ; Robertson, Douglas D. ; Kawashima, Akira. / Three-dimensional volumetric display of ct data : Effect of scan parameters upon image quality. In: Journal of Computer Assisted Tomography. 1991 ; Vol. 15, No. 5. pp. 875-885.
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