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Isotropic chest CT examination

CT Marketing Philips Healthcare

Diagnostic quality of reformats

Rydberg J, Sandrasegaran K, Ying J, Akisik F, Choplin R and Tarver R.

* Originally published in the July 2006 issue of Clinical Radiology.


To evaluate the image quality of axial and coronal reformats obtained from isotropic resolution 40-channel chest computed tomography (CT) examinations.


Methods and Materials
Thirty consecutive patients with intravenous contrast-enhanced chest CT examinations using a 40-channel CT machine were enrolled for the study. The raw data were reconstructed into two sets of source axial images: 0.9 mm section width and 0.45 mm reconstruction interval (isotropic resolution) and 4 mm section width with 3 mm reconstruction interval (anisotropic resolution; group A). The isotropic data set was reformatted into axial and coronal stacks (groups B and C, respectively) with 4 mm section width and 3 mm interval. Three independent readers evaluated stacks A to C using a three-point scale for resolution of right lower lobe segmental bronchi, edge sharpness of major and minor fissures, respiratory motion artefact, reconstruction artefact, noise and overall image quality.


The sharpness of fissures scored significantly higher with the coronal reformats (group C) compared with the axial image sets (groups A and B) (p < 0.01). Noise in group A scored significantly lower than groups B or C (p < 0.01). For other parameters there was no statistical difference between the groups. There was substantial or excellent agreement between the reviewers.


Isotropic imaging of the chest allows creation of reformats with similar image quality as similar thickness axial source images. These reformats are probably of sufficient quality to form the basis of clinical interpretation.

For more information about this publication, check out the PubMed listing for this article.

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Sep 29, 2008

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Brilliance 40-channel
artifacts, Body, chest, contrast-enhanced, image quality, Thorax

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