- Meeting abstract
- Open Access
115 Parallel acquisition to improve temporal resolution in the rapid detection of myocardial infarction: comparison of image quality and artifacts
© Bahekar et al; licensee BioMed Central Ltd. 2008
- Published: 22 October 2008
- Cardiac Magnetic Resonance
- Temporal Resolution
- Parallel Image
- Steady State Free Precession
- Delay Enhancement
Imaging speed is of critical importance in Cardiac Magnetic Resonance (CMR) imaging especially in patients with severe cardiac disease. Parallel MR imaging uses spatial encoding inherent in phased-array radiofrequency coils to accelerate image acquisition to improve temporal resolution.
Aim of the current study is to compare the CMR images of post-myocardial infarct (MI) patients acquired using single-shot inversion recovery, steady state free precession sequence with images acquired using parallel imaging technique (PAT).
Parallel techniques had an average 40% reduction in acquisition times during diastole. There was no difference between the standard images and GRAPPA images in terms of extent of infarct (4.84 vs. 4.77, P = 0.43), micro-vascular obstruction (0.30 vs. 0.34, P = 0.42), transmural infarct score (1.18 vs. 1.13, P = 0.43), and total infarct score (10.78 vs. 10.45, P = 0.41). Similarly there was no difference between the standard images and mSENSE images in terms of extent of infarct (4.84 vs. 4.84, P = 0.50), micro-vascular obstruction (0.30 vs. 0.31, P = 0.47), transmural infarct score (1.18 vs. 1.29, P = 0.38), and total infarct score (10.78 vs. 10.81, P = 0.49). A greater number of standard and GRAPPA studies were graded excellent than mSENSE, and mSENSE had significantly greater artifacts than the others (P < 0.001). In patients with a heart rate >65 (n = 35), GRAPPA had greater excellent quality images (43%) than standard (29%, P < 0.05) or mSENSE (14%, P < 0.05). Also image artifacts were significantly more prevalent in mSENSE (43%) as compared to standard (9%, P < 0.001) or GRAPPA (9%, P < 0.001).
All imaging techniques can adequately assess the size and extent of infarction. However at faster heart rates, GRAPPA performed better with less artifacts and more number of excellent images than mSENSE. The high quality images with GRAPPA are due to an improvement in temporal resolution.
This article is published under license to BioMed Central Ltd.