Comparison of Accelerated Velocity Encoded MRI with SENSE and kt- BLAST in a Beating Heart Phantom
نویسندگان
چکیده
Introduction: For a detailed analysis of myocardial motion high temporal and spatial resolution is required. To avoid unacceptable long acquisition times, rapid imaging techniques have to be applied. In this contribution kt-BLAST and SENSE are compared in a beating heart phantom regarding the preservation of the velocity data in velocity encoded myocardial imaging at different degrees of acceleration. The highly reproducible motion curve of the heart phantom enables the quantitative comparison of the different techniques under reproducible conditions. All quantitative data is compared to the motion curves obtained by the non-accelerated technique.
منابع مشابه
Kt-accelerated velocity-encoded black-blood MRI for quantification of myocardial motion at 3.0T
The analysis of myocardial contraction and relaxation demands high temporal and spatial resolution. Therefore any significant improvement in imaging speed, without sacrificing image quality is welcome since more volume can be covered in the same time. In this contribution kt-Blast [1] was applied to accelerate phase contrast velocity-encoded black-blood functional imaging of the heart. The quan...
متن کاملParallel MRI with Extended and Averaged Grappa Kernels (PEAK-Grappa): SNR optimized fast dynamic imaging with high acceleration factors
Introduction: In order to reduce total acquisition time or to increase spatiotemporal resolution in dynamic MRI several techniques such as TSENSE [1], TGrappa [2], kt-SENSE, kt-BLAST [3] and kt-Grappa [4] have recently been introduced. The combination of parallel MRI and temporal imaging acceleration permits the use of higher acceleration factors compared to conventional parallel imaging techni...
متن کاملCardiac diffusion MRI without motion effects.
We present a method for diffusion tensor MRI in the beating heart that is insensitive to cardiac motion and strain. Using a stimulated echo pulse sequence with two electrocardiogram (ECG) triggers, diffusion-encoding bipolar gradient pulses are applied at identical phases in consecutive cardiac cycles. In this experiment, diffusion is encoded at a single phase in the cardiac cycle of less than ...
متن کاملAccuracy of four-dimensional phase-contrast velocity mapping for blood flow visualizations: a phantom study.
BACKGROUND Time-resolved three-dimensional, three-directional phase-contrast magnetic resonance velocity mapping (4D PC-MRI) is a powerful technique to depict dynamic blood flow patterns in the human body. However, the impact of phase background effects on flow visualizations has not been thoroughly studied previously, and it has not yet been experimentally demonstrated to what degree phase off...
متن کاملFast dynamic parallel phase contrast MRI with high acceleration factors and optimized SNR
Introduction: Time-resolved phase contrast (PC) MRI is important for many clinical applications and requires fast data acquisition. In order to increase spatiotemporal resolution or reduce total acquisition times, parallel imaging techniques such as kt-SENSE, kt-BLAST [1] and kt-Grappa [2] have been introduced. For kt-BLAST/ kt-SENSE it has been shown that high reduction factors of the order of...
متن کامل