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J Comput Assist Tomogr. 1999 May-Jun;23(3):380-4.

Optimized scanning conditions of high resolution CT in the follow-up of pulmonary emphysema.

Author information

1
Department of Physical Therapeutics, Kyoto University Hospital, and Institute for Frontier Medical Science, Japan.

Abstract

PURPOSE:

To address the optimal scanning condition of high resolution computerized tomography from the perspective of minimizing exposed dose.

METHOD:

The influence of the electric current, the slice number, and the slice thickness on precise percent ratio of the low attenuation area to whole lung field (LAA%) of chronic obstructive pulmonary disease patients was examined. The standard conditions were 250 mA, 3 slices, 2 mm slice thickness, and a varied parameter.

RESULTS:

In cases showing an LAA% less than 30, LAA% obtained by < or =150 mA were significantly larger than those by 250 mA. The mean LAA% with 3 and 10 slices were well correlated and the correlation with lung function was similar. The correlation of LAA% with lung function was approximately the same between the 2 and 5 mm slice thicknesses.

CONCLUSION:

The electrical current must be > or =200 mA, and 3 slices and 2 mm slice thickness are appropriate.

[Indexed for MEDLINE]

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