Purpose: Lung function is typically characterized by spirometer measurements, which do not offer spatially specific information. Imaging during exhalation provides spatial information but is challenging due to large movement over a short time. The purpose of this work is to provide a solution to lung imaging during forced expiration using accelerated magnetic resonance imaging. The method uses radial golden angle stack-of-stars gradient echo acquisition and compressed sensing reconstruction. Methods: A technique for dynamic three-dimensional imaging of the lungs from highly undersampled data is developed and tested on six subjects. This method takes advantage of image sparsity, both spatially and temporally, including the use of reference frames called bookends. Sparsity, with respect to total variation, and residual from the bookends, enables reconstruction from an extremely limited amount of data. Results: Dynamic three-dimensional images can be captured at sub-150 ms temporal resolution, using only three (or less) acquired radial lines per slice per timepoint. The images have a spatial resolution of 4.6 x 4.6 x 10 mm. Lung volume calculations based on image segmentation are compared to those from simultaneously acquired spirometer measurements. Conclusion: Dynamic lung imaging during forced expiration is made possible by compressed sensing accelerated dynamic three-dimensional radial magnetic resonance imaging. (C) 2015 Wiley Periodicals, Inc.
| Identifer | oai:union.ndltd.org:arizona.edu/oai:arizona.openrepository.com:10150/621535 |
| Date | 06 1900 |
| Creators | Berman, Benjamin P., Pandey, Abhishek, Li, Zhitao, Jeffries, Lindsie, Trouard, Theodore P., Oliva, Isabel, Cortopassi, Felipe, Martin, Diego R., Altbach, Maria I., Bilgin, Ali |
| Contributors | Univ Arizona, Program Appl Math, Univ Arizona, Dept Elect & Comp Engn, Univ Arizona, Dept Biomed Engn, Univ Arizona, Dept Med Imaging, Program in Applied Mathematics; University of Arizona; Tucson Arizona USA, Department of Electrical and Computer Engineering; University of Arizona; Tucson Arizona USA, Department of Electrical and Computer Engineering; University of Arizona; Tucson Arizona USA, Department of Biomedical Engineering; University of Arizona; Tucson Arizona USA, Department of Biomedical Engineering; University of Arizona; Tucson Arizona USA, Department of Medical Imaging; University of Arizona; Tucson Arizona USA, Department of Medical Imaging; University of Arizona; Tucson Arizona USA, Department of Medical Imaging; University of Arizona; Tucson Arizona USA, Department of Medical Imaging; University of Arizona; Tucson Arizona USA, Department of Electrical and Computer Engineering; University of Arizona; Tucson Arizona USA |
| Publisher | WILEY-BLACKWELL |
| Source Sets | University of Arizona |
| Language | English |
| Detected Language | English |
| Type | Article |
| Rights | © 2015 Wiley Periodicals, Inc. |
| Relation | http://doi.wiley.com/10.1002/mrm.25798 |
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