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Automated identification of minimal myocardial motion for improved image quality on MR angiography at 3 T

Ali Ustun1, Milind Desai, Khaled Z Abd-Elmoniem

  • 1Department of Radiology, Johns Hopkins University Medical School, JHOC 4223, 601 N Caroline St., Baltimore, MD 21287, USA.

AJR. American Journal of Roentgenology
|February 22, 2007
PubMed
Abstract

Insights

FREEZE, an automated tool, improves coronary magnetic resonance angiography (MRA) image quality by identifying minimal myocardial motion. This enhances vessel sharpness and signal-to-noise ratio, making MRA more reliable and easier to perform.

Area of Science:

  • Cardiovascular Imaging
  • Medical Physics
  • Magnetic Resonance Imaging

Background:

  • Minimizing myocardial motion is crucial for high-quality coronary magnetic resonance angiography (MRA).
  • Accurate identification of the quiescent cardiac phase is essential for optimal image acquisition.
  • Existing methods may be operator-dependent and time-consuming.

Purpose of the Study:

  • To evaluate the effectiveness of FREEZE, a custom automated tool, in identifying minimal myocardial motion.
  • To assess the impact of FREEZE on coronary MRA image quality in a phantom and in healthy volunteers.
  • To determine if FREEZE improves objective measurements and subjective image quality assessments.

Main Methods:

  • FREEZE was tested on a moving phantom at 1.5 T and 10 healthy adults at 3 T.
  • Coronary MRA was performed using the period of minimal myocardial motion identified by FREEZE.
  • Objective metrics (dimension measurements, sharpness, SNR, CNR) and subjective image quality were analyzed.

Main Results:

  • Dimension measurements in the moving phantom approached static phantom accuracy with FREEZE.
  • Vessel sharpness, SNR, and CNR significantly improved in vitro during FREEZE-guided MRA (p < 0.05).
  • Consensus review confirmed significant improvements in overall image quality using FREEZE.

Conclusions:

  • The FREEZE tool effectively identifies the period of minimal myocardial motion for coronary MRA.
  • Utilizing FREEZE significantly enhances coronary MRA image quality, including vessel sharpness and SNR.
  • FREEZE improves ease of use and reduces operator dependence in coronary MRA acquisition.

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