Radiology, Vol 201, 793-797, Copyright © 1996 by Radiological Society of North America

ARTICLES

Changes in lung volume and volume of emphysema after unilateral lung reduction surgery: analysis with CT lung densitometry

JM Holbert, ML Brown, FC Sciurba, RJ Keenan, RJ Landreneau and AD Holzer
Department of Radiology, University of Pittsburgh Medical Center, Montefiore Hospital, PA 15213-2582, USA.

PURPOSE: To evaluate changes in volume of the lungs and volume of emphysema after unilateral lung reduction surgery (ULRS) by using computed tomographic (CT) lung densitometry. MATERIALS AND METHODS: Twenty-eight patients underwent CT before and 3 months after ULRS. With use of a density mask software program and a three-dimensional graphics workstation, CT scans were analyzed to define the volume of the lungs and the volume of emphysema. Pre- and postoperative mean CT numbers were determined. RESULTS: After ULRS, the surgically reduced lung volume decreased 22%, and the intact opposite lung volume increased 4%. Emphysema in the surgically reduced lung decreased 14% and was unchanged in the intact opposite lung. Mean CT numbers in the surgically reduced lung increased 26 HU but were unchanged in the intact opposite lung. CONCLUSION: The effects of ULRS on each lung can be evaluated by using CT lung densitometry and a three-dimensional graphics workstation. ULRS reduces emphysema and lung volume in the surgically reduced lung without statistically significant worsening of contralateral emphysema at 3 months.

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