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Whole-heart imaging using undersampled radial phase encoding (RPE) and iterative sensitivity encoding (SENSE)

R Boubertakh¹, C Prieto, P G Batchelor

¹King's College London, British Heart Foundation (BHF) Centre, Division of Imaging Sciences, National Institute for Health Research (NIHR) Biomedical Research Centre at Guy's & St Thomas' National Health Service (NHS) Foundation Trust, London, UK.

Magnetic Resonance in Medicine

|September 26, 2009

Summary

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Whole-heart isotropic nonangulated cardiac MRI (CMR) simplifies scans but is slow. This study introduces a novel 3D acquisition combining Cartesian and radial sampling, significantly improving image quality and reducing scan times, even at high acceleration factors.

Area of Science:

Medical Imaging
Cardiovascular Magnetic Resonance

Background:

Whole-heart isotropic nonangulated cardiac MRI (CMR) simplifies protocols by eliminating complex angulation planning.
However, long acquisition times limit whole-heart MRI due to large fields of view (FOVs) and high spatial resolution requirements.

Purpose of the Study:

To develop a faster 3D whole-heart CMR acquisition method.
To improve image quality in accelerated whole-heart MRI scans.

Main Methods:

Proposed a 3D acquisition combining Cartesian sampling (readout) with undersampled radial sampling (phase-encoding plane).
Investigated various undersampling patterns with iterative sensitivity encoding (SENSE) reconstruction and a 32-channel cardiac coil.
Evaluated performance using noise amplification maps and implemented the radial phase-encoding (RPE) scheme on a clinical scanner.

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Main Results:

The radial phase-encoding (RPE) scheme demonstrated superior image quality compared to Cartesian acquisitions.
The method maintained good image quality even with high acceleration factors, up to 12.
Tested successfully on phantoms and healthy volunteers.

Conclusions:

The proposed 3D acquisition scheme effectively reduces whole-heart MRI acquisition times.
This technique offers improved image quality at high acceleration factors, making CMR more feasible.
The RPE method represents a significant advancement for accelerated cardiac MRI.