Texture analysis using proton density and T2 relaxation in patients with histological usual interstitial pneumonia (UIP) or nonspecific interstitial pneumonia (NSIP)

Objectives The purpose of our study was to assess proton density (PD) and T2 relaxation time of usual interstitial pneumonia (UIP) and nonspecific interstitial pneumonia (NSIP) and to evaluate their utility in differentiating the two patterns. Furthermore, we aim to investigate whether these two par...

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Main Authors: Buzan, Maria Teodora (Author) , Wetscherek, Andreas (Author) , Heußel, Claus Peter (Author) , Kreuter, Michael (Author) , Herth, Felix (Author) , Warth, Arne (Author) , Kauczor, Hans-Ulrich (Author) , Dinkel, Julien (Author)
Format: Article (Journal)
Language:English
Published: May 16, 2017
In: PLOS ONE
Year: 2017, Volume: 12, Issue: 5, Pages: 1-11
ISSN:1932-6203
DOI:10.1371/journal.pone.0177689
Online Access:Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1371/journal.pone.0177689
Verlag, kostenfrei, Volltext: http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0177689
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Author Notes:Maria T. A. Buzan, Andreas Wetscherek, Claus Peter Heussel, Michael Kreuter, Felix J. Herth, Arne Warth, Hans-Ulrich Kauczor, Carmen Monica Pop, Julien Dinkel

MARC

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520 |a Objectives The purpose of our study was to assess proton density (PD) and T2 relaxation time of usual interstitial pneumonia (UIP) and nonspecific interstitial pneumonia (NSIP) and to evaluate their utility in differentiating the two patterns. Furthermore, we aim to investigate whether these two parameters could help differentiate active-inflammatory and stable-fibrotic lesions in NSIP. Methods 32 patients (mean age: 69 years; M:F, 1:1) with pathologically proven disease (UIP:NSIP, 1:1), underwent thoracic thin-section multislice CT scan and 1.5T MRI. A total of 437 regions-of-interest (ROIs) were classified at CT as advanced, moderate or mild alterations. Based on multi-echo single-shot TSE sequence acquired at five echo times, with breath-holding at end-expiration and ECG-triggering, entire lung T2 and PD maps were generated from each subject. The T2 relaxation time and the respective signal intensity were quantified by performing a ROI measurement on the T2 and PD maps in the corresponding CT selected areas of the lung. Results UIP and NSIP regional patterns could not be differentiated by T2 relaxation times or PD values alone. Overall, a strong positive correlation was found between T2 relaxation and PD in NSIP, r = 0.64, p<0.001; however, this correlation was weak in UIP, r = 0.20, p = 0.01. T2 relaxation showed significant statistical difference between active-inflammatory and stable-fibrotic NSIP regions at all levels, p<0.05, while for the analysis of ventral lesions PD proved no statistical difference, p>0.05. Conclusions T2 relaxation times and PD values may provide helpful quantitative information for differentiating NSIP from UIP pattern. These parameters have the potential to differentiate active-inflammatory and stable-fibrotic lesions in NSIP. 
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650 4 |a Lesions 
650 4 |a Magnetic resonance imaging 
650 4 |a NMR relaxation 
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650 4 |a Pulmonary imaging 
650 4 |a Relaxation time 
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