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Inversion recovery radial MRI with interleaved projection sets.
Dana C Peters1, René M Botnar, Kraig V Kissinger
1Department of Medicine, Cardiovascular Division, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts 02215, USA. dcpeters@bidmc.harvard.edu
Magnetic Resonance in Medicine
|April 7, 2006
Summary
This study introduces a novel radial imaging technique for cardiac scar imaging, producing multiple contrasts from one scan. The method enhances image quality, especially with shorter inversion times, improving cardiac viability assessment.
Area of Science:
- Cardiovascular Imaging
- Medical Physics
- Radiology
Background:
- Radial imaging offers resilience to undersampling and motion artifacts in cardiac applications.
- Interleaved and weighted radial techniques can generate multiple image contrasts from a single dataset.
- Inversion recovery imaging is crucial for detecting myocardial scar.
Purpose of the Study:
- To investigate the utility of interleaved and weighted 2D radial imaging for inversion recovery cardiac scar imaging.
- To evaluate a novel method generating four images with different T1 weightings from a single acquisition.
- To compare this technique against non-interleaved radial and Cartesian imaging methods.
Main Methods:
- Modified 2D radial imaging to acquire quadruply interleaved projection sets.
- Applied k-space weightings, using a smaller acquisition window segment for central k-space data to control contrast.
- Compared the novel approach with non-interleaved radial, interleaved radial without weightings, and Cartesian imaging in simulations, phantoms, and human subjects.
Main Results:
- Interleaved radial acquisition demonstrated superior image quality compared to non-interleaved radial acquisition.
- The interleaved acquisition with weighting improved image quality at shorter inversion times (TI).
- Interleaved radial without weighting was superior at longer, optimal inversion times.
Conclusions:
- The developed radial imaging technique enables the acquisition of multiple T1-weighted images for cardiac scar assessment.
- This method enhances image quality and provides flexibility in contrast selection for viability imaging.
- Radial imaging can be effectively combined with preparation pulses for improved cardiac viability imaging.