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Quantitative CT indexes in idiopathic pulmonary fibrosis: relationship with physiologic impairment.

Abstract：

PURPOSE:To determine whether measurements of skewness, kurtosis, and mean lung attenuation on thin-section computed tomographic (CT) histograms in patients with idiopathic pulmonary fibrosis (IPF) correlate with pulmonary physiologic abnormality in a nonspirometrically controlled multicenter study. MATERIALS AND METHODS:The authors analyzed baseline digital thin-section CT data from 144 patients with IPF who enrolled in a double-blind placebo-controlled clinical effectiveness trial of interferon beta 1a in the treatment of IPF. All patients underwent thin-section CT in the supine position at full inspiration. The lungs were isolated by using a semiautomated thresholding technique, with an upper threshold of -200 HU. An attenuation correction algorithm was used. Pulmonary function tests (PFTs) included forced vital capacity, total lung capacity, forced expiratory volume in 1 second, and diffusing lung capacity. Univariate and multiple correlation and regression statistical analyses were used to determine relationships between histogram features and results of PFTs. RESULTS:Moderate correlations existed between histogram features and PFT results. Kurtosis showed the greatest degree of correlation with physiologic abnormality (r = 0.53, P <.01). Strength of correlation increased with exclusion of suboptimal scans but did not change significantly after application of an attenuation correction algorithm. Attenuations for lungs, gas, and soft tissue varied considerably between scanner manufacturers. Kurtosis alone provided predictions of pulmonary function that were virtually as good as those from all histogram features combined. CONCLUSION:Thin-section CT histograms of the lungs were found to correlate with results of PFTs in patients with IPF, which supports the claim that histogram features can be used as valid indexes of IPF in a multiinstitutional nonspirometrically controlled study.

journal_name

Radiology

journal_title

Radiology

authors

Best AC,Lynch AM,Bozic CM,Miller D,Grunwald GK,Lynch DA

doi

10.1148/radiol.2282020274

subject

Has Abstract

pub_date

2003-08-01 00:00:00

pages

407-14

issue

eissn

0033-8419

issn

1527-1315

pii

2282020274

journal_volume

228

pub_type

临床试验,杂志文章,多中心研究

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Quantitative CT indexes in idiopathic pulmonary fibrosis: relationship with physiologic impairment.