Key result
Radial scan with fat suppression reduces chemical shift artifacts and improves carotid plaque MRI signal ratios.
Why the study?
Optimization of scan parameters for evaluation of carotid plaque characteristics using the radial scan method was needed to improve image quality and signal ratio.
Does the radial scan method with optimized TR and fat suppression improve image quality and signal ratio in evaluating carotid plaque characteristics in a phantom model?
Does the radial scan method with optimized TR and fat suppression improve image quality and signal ratio in evaluating carotid plaque characteristics in a phantom model?
Answers are grounded in this paper and cite their sources.
Optimizing repetition time and using fat suppression with a radial scan method improves MRI evaluation of carotid plaque characteristics in a phantom model.
The purpose of this study was to optimize scan parameters for evaluation of carotid plaque characteristics by k-space trajectory (radial scan method), using a custom-made carotid plaque phantom. The phantom was composed of simulated sternocleidomastoid muscle and four types of carotid plaque. The effect of chemical shift artifact was compared using T1 weighted images (T1WI) of the phantom obtained with and without fat suppression, and using two types of k-space trajectory (the radial scan method and the Cartesian method). The ratio of signal intensity of simulated sternocleidomastoid muscle to the signal intensity of hematoma, blood (including heparin), lard, and mayonnaise was compared among various repetition times (TR) using T1WI and T2 weighted imaging (T2WI). In terms of chemical shift artifacts, image quality was improved using fat suppression for both the radial scan and Cartesian methods. In terms of signal ratio, the highest values were obtained for the radial scan method with TR of 500 ms for T1WI, and TR of 3000 ms for T2WI. For evaluation of carotid plaque characteristics using the radial scan method, chemical shift artifacts were reduced with fat suppression. Signal ratio was improved by optimizing the TR settings for T1WI and T2WI. These results suggest the potential for using magnetic resonance imaging for detailed evaluation of carotid plaque.
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Nakamura et al. (2013) studied Carotid plaque (phantom study). Radial scan method with fat suppression and optimized TR vs. Cartesian method and unoptimized TR was evaluated on Signal ratio of simulated sternocleidomastoid muscle to simulated plaque components and chemical shift artifacts. In a carotid plaque phantom model, the radial scan method with fat suppression reduced chemical shift artifacts, and optimizing TR to 500 ms for T1WI and 3000 ms for T2WI improved the signal ratio.
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