High-resolution computed tomography of pneumoconiosis.
Kido-M; Kajiki-A; Yamazaki-H; Nakata-H; Egashira-K
NIOSH 1990 Nov; :1495-1504
The usefulness of high resolution computed tomography (HRCT) was evaluated in 37 cases of pneumoconiosis and diagnostic accuracy was compared with those of conventional chest radiography concerning profusion, shape and size according to the International Labour Organization 1980 classification of radiographs of pneumoconiosis. HRCT examination of the lung using an extended scale and three to four fold magnification imaging format presented the most recent improvement in computed tomography (CT). It had excellent spatial resolution in high contrast regions which was noted to be an advantage in evaluating interstitial diseases such as pneumoconiosis. There were substantial discrepancies between radiological and CT evaluation. Concerning nodular opacities, HRCT demonstrated good spatial resolution but lower profusion score than conventional chest radiographs. This may have reflected the effect of summation in posterior/anterior projection of plain X-P compared with the horizontal thin slice in CT. Attenuation of nodular opacities by emphysema also may have contributed to these emphysematous cases because it is suspected that progress of emphysema may attenuate the nodular opacities. Interstitial fibrosis, bullae, and emphysema were more clearly and specifically demonstrated on CT scan than conventional chest radiographs in most patients. The subpleural distributions of bullae were particularly well demonstrated in CT which may not be reflected in pulmonary function studies. HRCT was useful for performing detailed morphological analyses of abnormalities of the peripheral portions of the lung, but no clear correlation was noted between HRCT results and pulmonary function parameters.
Radiodiagnosis; Diagnostic-techniques; Coal-dust; Respiratory-system-disorders; Lung-function; Radiographic-analysis
DHHS (NIOSH) Publication No. 90-108
Asthma and Chronic Obstructive Pulmonary Disease; Disease and Injury; Respiratory-system-disorders
Proceedings of the VIIth International Pneumoconioses Conference