BMJ 1995;310:616 (11 March)

Editorials

High resolution computed tomography of the lungs

Better than chest radiography for some conditions

What you see on high resolution computed tomography of the lungs is as detailed as what you see when you look at a gross pathological specimen.1 It is the most accurate non-invasive method of evaluating lung parenchyma2 and has improved our understanding of the patterns and pathology of many pulmonary diseases.

In conventional computed tomography slices are 10 mm thick and scans are obtained at 10 mm intervals; in high resolution computed tomography slices are 1-2 mm thick and scans are obtained at 10-40 mm intervals. The images therefore represent only one tenth or less of the volume of the lung. This sampling is suited to diffuse processes affecting extensive areas of the lung but will clearly miss small lesions lying between slices. High resolution computed tomography can resolve an object of 0.5 mm diameter and is ideally suited for use in the . . . [Full text of this article]


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