Robert P Thomen1,2, James D Quirk3, David Roach1, Tiffany Egan-Rojas1, Kai Ruppert1, Roger D Yusen4, Talissa A Altes5, Dmitriy A Yablonskiy3, Jason C Woods1,2. 1. Center for Pulmonary Imaging Research, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA. 2. Department of Physics, Washington University in St. Louis, St. Louis, MO, USA. 3. Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, MO, USA. 4. Division of Pulmonary and Critical Care Medicine, Washington University School of Medicine, St. Louis, MO, USA. 5. Department of Radiology, University of Missouri, Columbia, MO, USA.
Abstract
PURPOSE: Chronic obstructive pulmonary disease (COPD) is an irreversible lung disease characterized by small-airway obstruction and alveolar-airspace destruction. Hyperpolarized 129 Xe diffusion MRI of lung is a promising biomarker for assessing airspace enlargement, but has yet to be validated by direct comparison to lung histology. Here we have compared diffusion measurements of hyperpolarized (HP) 129 Xe in explanted lungs to regionally matched morphological measures of airspace size. METHODS: Explanted lungs from five COPD patients and two idiopathic pulmonary fibrosis (IPF) patients were imaged using MRI with hyperpolarized 129 Xe using a two-b-value gradient-echo diffusion sequence, and 34 histological samples were taken from these lungs for quantitative histology. Mean-linear-intercept (Lm ) was compared with spatially matched measures of apparent diffusion coefficient (ADC) from 129 Xe MRI. RESULTS: The mean ADC from COPD lung samples was 0.071 ± 0.011 cm2 /s, and for IPF lungs was 0.033 ± 0.001 cm2 /s (P < 10-15 between groups). The mean Lm in COPD samples was 0.076 ± 0.027 cm and 0.041 ± 0.004 cm in IPF (P = 2.7 × 10-7 between groups). The Pearson-correlation between ADC and Lm measurements was r = 0.59. CONCLUSIONS: Diffusion MRI of HP 129 Xe quantifies regional airspace enlargement in COPD. 129 Xe ADC showed much less overlap between groups than quantitative histology, consistent with our past experience with 3 He diffusion MRI in COPD. Magn Reson Med 77:265-272, 2017.
PURPOSE:Chronic obstructive pulmonary disease (COPD) is an irreversible lung disease characterized by small-airway obstruction and alveolar-airspace destruction. Hyperpolarized 129 Xe diffusion MRI of lung is a promising biomarker for assessing airspace enlargement, but has yet to be validated by direct comparison to lung histology. Here we have compared diffusion measurements of hyperpolarized (HP) 129 Xe in explanted lungs to regionally matched morphological measures of airspace size. METHODS: Explanted lungs from five COPDpatients and two idiopathic pulmonary fibrosis (IPF) patients were imaged using MRI with hyperpolarized 129 Xe using a two-b-value gradient-echo diffusion sequence, and 34 histological samples were taken from these lungs for quantitative histology. Mean-linear-intercept (Lm ) was compared with spatially matched measures of apparent diffusion coefficient (ADC) from 129 Xe MRI. RESULTS: The mean ADC from COPD lung samples was 0.071 ± 0.011 cm2 /s, and for IPF lungs was 0.033 ± 0.001 cm2 /s (P < 10-15 between groups). The mean Lm in COPD samples was 0.076 ± 0.027 cm and 0.041 ± 0.004 cm in IPF (P = 2.7 × 10-7 between groups). The Pearson-correlation between ADC and Lm measurements was r = 0.59. CONCLUSIONS: Diffusion MRI of HP 129 Xe quantifies regional airspace enlargement in COPD. 129 Xe ADC showed much less overlap between groups than quantitative histology, consistent with our past experience with 3 He diffusion MRI in COPD. Magn Reson Med 77:265-272, 2017.
Authors: Kai Ruppert; Faraz Amzajerdian; Hooman Hamedani; Yi Xin; Luis Loza; Tahmina Achekzai; Ian F Duncan; Harrilla Profka; Sarmad Siddiqui; Mehrdad Pourfathi; Maurizio F Cereda; Stephen Kadlecek; Rahim R Rizi Journal: Magn Reson Med Date: 2018-04-22 Impact factor: 4.668
Authors: David J Roach; Matthew M Willmering; Joseph W Plummer; Laura L Walkup; Yin Zhang; Md Monir Hossain; Zackary I Cleveland; Jason C Woods Journal: Acad Radiol Date: 2021-08-12 Impact factor: 3.173
Authors: Nara S Higano; Robert P Thomen; James D Quirk; Heidie L Huyck; Andrew D Hahn; Sean B Fain; Gloria S Pryhuber; Jason C Woods Journal: Neonatology Date: 2020-11-11 Impact factor: 4.035
Authors: Sina Tafti; William J Garrison; John P Mugler; Y Michael Shim; Talissa A Altes; Jaime F Mata; Eduard E de Lange; Gordon D Cates; Alan M Ropp; Chengbo Wang; G Wilson Miller Journal: Radiology Date: 2020-08-11 Impact factor: 11.105