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Reduction of blurring in view angle tilting MRI
Kim Butts1, John M Pauly, Garry E Gold
1Department of Radiology, Stanford University, Stanford, California, USA. kimbutts@stanford.edu
Magnetic Resonance in Medicine
|January 29, 2005
Summary
View Angle Tilting (VAT) corrects MRI distortions near metal but causes blurring. This study identifies slice profile modulation as the cause and proposes solutions, including multiple high-bandwidth readouts, to reduce blurring and improve signal-to-noise ratio (SNR).
Area of Science:
- Medical Imaging
- Physics
- Biomedical Engineering
Background:
- Metallic objects in Magnetic Resonance Imaging (MRI) cause significant artifacts, including slice-selection errors and in-plane distortions.
- View Angle Tilting (VAT) is a technique used to correct in-plane distortions but often introduces image blurring.
Purpose of the Study:
- To identify the primary cause of blurring in View Angle Tilting (VAT) during MRI.
- To propose and evaluate methods for mitigating blurring and improving image quality in VAT-corrected MRI scans.
Main Methods:
- Investigated the relationship between slice profile modulation and image blurring in VAT.
- Developed and tested solutions to counteract slice profile modulation.
- Implemented and assessed multiple high-bandwidth readouts as a method to reduce blurring and enhance signal-to-noise ratio (SNR).
Main Results:
- Slice profile modulation was identified as the major contributor to blurring in VAT.
- Proposed solutions effectively reduced blurring artifacts.
- Multiple high-bandwidth readouts demonstrated a reduction in blurring and an improvement in SNR compared to single high-bandwidth readouts.
Conclusions:
- Blurring in VAT-corrected MRI is primarily due to slice profile modulation.
- Techniques to prevent slice profile modulation can significantly improve image quality.
- Multiple high-bandwidth readouts offer a promising approach to simultaneously reduce blurring and enhance SNR in VAT-corrected MRI.