Abstract
PurposeTo compare quantitative fractional ventilation measurements from multiple breath washout imaging (MBW‐I) using hyperpolarized 3He with both spoiled gradient echo (SPGR) and balanced steady‐state free precession (bSSFP) three‐dimensional (3D) pulse sequences and to evaluate the feasibility of MBW‐I with hyperpolarized 129Xe.MethodsSeven healthy subjects were scanned using 3He MBW‐I with 3D SPGR and bSSFP sequences. Five also underwent MBW‐I with 129Xe. A dual‐tuned coil was used to acquire MBW‐I data from both nuclei in the same subject position, enabling direct comparison of regional information.ResultsHigh‐quality MBW images were obtained with bSSFP sequences using a reduced dose (100 mL) of inhaled hyperpolarized 3He. 3D MBW‐I with 129Xe was also successfully demonstrated with a bSSFP sequence. Regional quantitative ventilation measures derived from 3He and 129Xe MBW‐I correlated well in all subjects (P < 0.001) with mean Pearson's correlation coefficients of r = 0.61 and r = 0.52 for 3He SPGR‐bSSFP and 129Xe‐3He (bSSFP) comparisons. The average intersubject mean difference (and standard deviation) in fractional ventilation in SPGR‐bSSFP and 129Xe‐3He comparisons was 15% (28%) and 9% (38%), respectively.ConclusionsImproved sensitivity in MBW‐I can be achieved with polarization‐efficient bSSFP sequences. Same scan‐session 3D MBW‐I with 3He and 129Xe has been demonstrated using a dual‐tuned coil. Magn Reson Med 77:2288–2295, 2017. © 2016 The Authors Magnetic Resonance in Medicine published by Wiley Periodicals, Inc. on behalf of International Society for Magnetic Resonance in Medicine. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Highlights
Pulmonary function testing based on dynamic monitoring of exhaled tracer gases is becoming increasingly used in a clinical setting to monitor lung ventilation heterogeneity [1]
multiple breath washout imaging (MBW-I) with 3He using both spoiled gradient echo (SPGR) and balanced steady-state free precession (bSSFP) sequences was performed successfully in all seven subjects, and image quality was sufficient to generate fractional ventilation maps. 3He Multiple breath washout (MBW) images acquired from subject 4 with SPGR and bSSFP sequences are shown in Figure 1, alongside resulting fractional ventilation maps of the corresponding slices (Fig. 1)
To demonstrate the signal benefits associated with bSSFP sequences, an additional 3He MBW-I dataset was acquired using a bSSFP sequence with a two-fold increased spatial resolution (64 Â 51 in-plane, subject 2)
Summary
Pulmonary function testing based on dynamic monitoring of exhaled tracer gases is becoming increasingly used in a clinical setting to monitor lung ventilation heterogeneity [1]. MBW is a sensitive marker of functional changes in the small airways (
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