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Related Experiment Videos

Cardiac cine parallel imaging on a 0.7T open system.

Masahiro Takizawa1, Tomohiro Goto, Hiroyuki Mochizuki

  • 1Research and Development Center, Hitachi Medical Corporation, Kashiwa, Chiba 277-0804, Japan. takizawa@rd.hitachi-medical.co.jp

Magnetic Resonance in Medical Sciences : MRMS : an Official Journal of Japan Society of Magnetic Resonance in Medicine
|August 12, 2005
PubMed
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Cardiac cine parallel imaging (RAPID) was successfully achieved using an open 0.7T MRI system. This advancement improves cardiac imaging speed and resolution in open MRI settings.

Area of Science:

  • Medical Imaging
  • Magnetic Resonance Imaging
  • Cardiovascular Imaging

Background:

  • Parallel imaging techniques are established for cardiac MRI in cylindrical systems.
  • Limited research exists on parallel imaging applications in open MRI scanners.
  • This study aimed to adapt cardiac cine parallel imaging for an open 0.7T MRI apparatus.

Purpose of the Study:

  • To develop and evaluate a cardiac cine parallel imaging technique (RAPID) for an open 0.7T MRI system.
  • To assess the feasibility and image quality of RAPID in an open MRI environment.

Main Methods:

  • Utilized a dedicated four-channel RF receiving coil (solenoid and butterfly coils) to reduce imaging time.
  • Employed RF-coil simulation considering biological load for optimal coil design.

Related Experiment Videos

  • Implemented auto-calibration with a modified image-domain reconstruction algorithm for the 0.7T open MRI.
  • Acquired cine images using a balanced SARGE (steady-state acquisition with rewound gradient echo) sequence.
  • Evaluated image quality using phantoms and five healthy volunteers.

    • Main Results:

    • Phantom imaging demonstrated no visible artifacts.
    • Cardiac cine images acquired with an acceleration factor of two showed no visible unfolded or motion artifacts.
    • Auto-calibration facilitated artifact-free imaging.
    • RAPID significantly enhanced acquisition speed, temporal resolution, and spatial resolution for various cardiac views.

    Conclusions:

    • Cardiac cine RAPID is feasible with an open MRI apparatus.
    • A dedicated RF coil is crucial for enabling RAPID in open MRI systems.
    • This technique offers improved performance for cardiac imaging in non-traditional MRI settings.