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Reducing oblique flow effects in interleaved EPI with a centric reordering technique.
G Beck1, D Li, E M Haacke
1Philips Medical Systems B.V., Best, The Netherlands. gabrielle.beck@philips.com
Magnetic Resonance in Medicine
|April 3, 2001
Summary
Centric reordering in magnetic resonance angiography significantly reduces artifacts caused by oblique flow. The nonalternating centric scheme is superior due to smoother phase error transitions, improving imaging quality.
Area of Science:
- Medical Imaging
- Biophysics
- Magnetic Resonance Imaging
Background:
- Segmented interleaved echo planar imaging is a rapid method for magnetic resonance angiography.
- This technique is highly susceptible to artifacts from oblique flow within the imaging plane.
Purpose of the Study:
- To mathematically analyze the effects of oblique flow on k-space coverage in segmented interleaved echo planar imaging.
- To compare the flow properties of conventional linear, alternating centric, and nonalternating centric k-space acquisition schemes.
Main Methods:
- Mathematical analysis of oblique flow effects.
- Simulations of k-space acquisition schemes.
- Imaging experiments to validate findings.
Main Results:
- Both alternating and nonalternating centric reordering schemes effectively reduce artifacts from oblique in-plane flow.
- The nonalternating centric scheme demonstrates superior performance over the alternating centric scheme.
- Smoother phase error transitions in k-space are observed with the nonalternating centric scheme.
Conclusions:
- Centric reordered phase-encoding schemes are effective in mitigating oblique flow artifacts in segmented interleaved echo planar imaging.
- The nonalternating centric acquisition scheme is recommended for its improved performance in handling obliquely-angled flow.