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An Experimental Protocol for Assessing the Performance of New Ultrasound Probes Based on CMUT Technology in Application to Brain Imaging
Published on: September 24, 2017
Evaluation of motion effects on parallel MR imaging with precalibration
Jun-Yu Guo1, Eugene G Kholmovski, Ling Zhang
1Department of Physics, University of Utah, Salt Lake City, UT 84108, USA. jguo@ucair.med.utah.edu
Magnetic Resonance Imaging
|October 2, 2007
Summary
Patient motion during reference scans can degrade image quality in parallel imaging. This study compares motion effects on SENSE, variable-density SENSE, and k-space inherited parallel acquisition (KIPA) methods, crucial for accelerated MRI.
Area of Science:
- Medical Imaging
- Magnetic Resonance Imaging (MRI)
- Image Reconstruction
Background:
- Parallel imaging techniques like SMASH, SENSE, and KIPA rely on reference scans for calibration.
- Reference scans provide data to estimate coil sensitivities or reconstruction coefficients.
- Inconsistencies between reference and imaging scans due to motion can lead to artifacts.
Purpose of the Study:
- To evaluate and compare the impact of patient motion on the performance of SENSE, variable-density SENSE, and KIPA.
- To understand how motion during calibration affects the accuracy of parallel MRI reconstructions.
Main Methods:
- Comparative analysis of three parallel imaging methods: SENSE, variable-density SENSE, and KIPA.
- Assessment of image reconstruction quality under simulated motion conditions between reference and accelerated scans.
- Quantification of artifact levels resulting from motion-induced calibration errors.
Main Results:
- Motion during reference scans significantly impacts the reconstruction quality of all tested parallel imaging methods.
- Variable-density SENSE and KIPA demonstrated different sensitivities to motion compared to standard SENSE.
- Artifacts were observed in reconstructions when motion corrupted the calibration data.
Conclusions:
- Patient motion is a critical factor affecting the reliability of parallel MRI techniques requiring reference scans.
- The choice of parallel imaging method may influence its susceptibility to motion-related artifacts.
- Careful patient positioning and motion management are essential for accurate accelerated MRI using these techniques.
