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Accelerated electron paramagnetic resonance imaging using partial Fourier compressed sensing reconstruction
- Title
- Accelerated electron paramagnetic resonance imaging using partial Fourier compressed sensing reconstruction
- Authors
- Chou, Chia-Chu; Chandramouli, Gadisetti V. R.; Shin, Taehoon; Devasahayam, Nallathamby; McMillan, Alan; Babadi, Behtash; Gullapalli, Rao; Krishna, Murali C.; Zhuo, Jiachen
- Ewha Authors
- 신태훈
- SCOPUS Author ID
- 신태훈
- Issue Date
- 2017
- Journal Title
- MAGNETIC RESONANCE IMAGING
- ISSN
- 0730-725X
1873-5894
- Citation
- MAGNETIC RESONANCE IMAGING vol. 37, pp. 90 - 99
- Keywords
- Electron paramagnetic resonance imaging; Compressed sensing; Single point imaging; Cycling hypoxia; Virtual coils
- Publisher
- ELSEVIER SCIENCE INC
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- Purpose: Electron paramagnetic resonance (EPR) imaging has evolved as a promising tool to provide non-invasive assessment of tissue oxygenation levels. Due to the extremely short T-2 relaxation time of electrons, single point imaging (SPI) is used in EPRI, limiting achievable spatial and temporal resolution. This presents a problem when attempting to measure changes in hypoxic state. In order to capture oxygen variation in hypoxic tissues and localize cycling hypoxia regions, an accelerated EPRI imaging method with minimal loss of information is needed. Methods: We present an image acceleration technique, partial Fourier compressed sensing (PFCS), that combines compressed sensing (CS) and partial Fourier reconstruction. PFCS augments the original CS equation using conjugate symmetry information for missing measurements. To further improve image quality in order to reconstruct low-resolution EPRI images, a projection onto convex sets (POCS)-based phase map and a spherical sampling mask are used in the reconstruction process. The PFCS technique was used in phantoms and in vivo SCC7 tumor mice to evaluate image quality and accuracy in estimating O-2 concentration. Results: In both phantom and in vivo experiments, PFCS demonstrated the ability to reconstruct images more accurately with at least a 4-fold acceleration compared to traditional CS. Meanwhile, PFCS is able to better preserve the distinct spatial pattern in a phantom with a spatial resolution of 0.6 mm. On phantoms containing Oxo63 solution with different oxygen concentrations, PFCS reconstructed linewidth maps that were discriminative of different O-2 concentrations. Moreover, PFCS reconstruction of partially sampled data provided a better discrimination of hypoxic and oxygenated regions in a leg tumor compared to traditional CS reconstructed images. Conclusions: EPR images with an acceleration factor of four are feasible using PFCS with reasonable assessment of tissue oxygenation. The technique can greatly enhance EPR applications and improve our understanding cycling hypoxia. Moreover this technique can be easily extended to various MRI applications. (C) 2016 Elsevier Inc. All rights reserved.
- DOI
- 10.1016/j.mri.2016.10.029
- Appears in Collections:
- 공과대학 > 휴먼기계바이오공학과 > Journal papers
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