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Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo

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Modified echo peak correction for radial acquisition regime (RADAR).

Masahiro Takizawa¹, Taeko Ito, Hiroyuki Itagaki

¹Application Development Department, MRI System Division, Hitachi Medical Corporation, Kashiwa, Chiba, Japan. takizawa@rd.hitachi-medical.co.jp

Magnetic Resonance in Medical Sciences : MRMS : an Official Journal of Japan Society of Magnetic Resonance in Medicine

|December 26, 2009

Summary

A modified echo-peak-shift correction (EPSC) algorithm significantly reduces artifacts in radial acquisition MRI, improving lung and cardiac imaging quality by addressing phase map errors.

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Area of Science:

Medical Imaging
Magnetic Resonance Imaging
Image Reconstruction

Background:

Radial sampling in MRI hardware presents limitations affecting image accuracy.
Existing echo-peak-shift correction (EPSC) algorithms show residual artifacts in specific applications like lung and cardiac imaging.
Artifacts in radial acquisition MRI (RADAR) can stem from hardware imperfections and physiological motion.

Purpose of the Study:

To modify the echo-peak-shift correction (EPSC) algorithm for improved image quality in radial acquisition MRI (RADAR).
To address residual artifacts in lung and cardiac imaging caused by phase map errors in EPSC.
To expand the applicability of EPSC to various RADAR sequences.

Main Methods:

Investigated phase map errors as the primary cause of artifacts using a phantom on a 1.5T MR scanner.
Compared current and modified EPSC on T(1)- and T(2)-weighted lung images of a volunteer.
Applied the modified EPSC to RADAR spin echo (SE) and RADAR balanced steady-state acquisition with rewound gradient echo (BASG) sequences.

Main Results:

The modified EPSC reduced phase discontinuity in reference data, enhancing blood vessel visualization in lung images.
No visible artifacts were observed due to motion or blood flow in RADAR SE and RADAR BASG images.
Improved image quality was achieved in challenging imaging scenarios with the modified EPSC.

Conclusions:

The modified EPSC effectively eliminated artifacts originating from signal loss in reference data.
Successful application of the modified EPSC to both RADAR SE and RADAR BASG sequences.
Enhanced image quality and artifact reduction in RADAR imaging, particularly for lung and cardiac applications.