Affiliation:
1. School of Biomedical Engineering Shanghai Jiao Tong University Shanghai People's Republic of China
2. National Engineering Research Center of Advanced Magnetic Resonance Technologies for Diagnosis and Therapy (NERC‐AMRT) Shanghai Jiao Tong University Shanghai People's Republic of China
3. Institute of Medical Robotics Shanghai Jiao Tong University Shanghai People's Republic of China
4. Department of Chemical and Biological Physics Weizmann Institute of Science Rehovot Israel
Abstract
AbstractPurposeDemonstrate the potential of spatiotemporal encoding (SPEN) MRI to deliver largely undistorted 2D, 3D, and diffusion weighted images on a 110 mT portable system.MethodsSPEN's quadratic phase modulation was used to subsample the low‐bandwidth dimension of echo planar acquisitions, delivering alias‐free images with an enhanced immunity to image distortions in a laboratory‐built, low‐field, portable MRI system lacking multiple receivers.ResultsHealthy brain images with different SPEN time‐bandwidth products and subsampling factors were collected. These compared favorably to EPI acquisitions including topup corrections. Robust 3D and diffusion weighted SPEN images of diagnostic value were demonstrated, with 2.5 mm isotropic resolutions achieved in 3 min scans. This performance took advantage of the low specific absorption rate and relative long TEs associated with low‐field MRI.ConclusionSPEN MRI provides a robust and advantageous fast acquisition approach to obtain faithful 3D images and DWI data in low‐cost, portable, low‐field systems without parallel acceleration.
Funder
National Natural Science Foundation of China
Israel Science Foundation
Shanghai Science and Technology Development Fund
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