Abstract: Magnetic Field Monitoring Figure 1: A comparison of the performance of a custom implemented constrained, image based B0 shimming algorithm (ST) that considers a region of interest (ROI, red) and a second region of less interest (ROLI, green) that might lead to artifacts in MRI and MRSI data in case of poor B0 shimming versus the vendor implemented B0 shim algorithm (FM) indicated a superior performance of the ST algorithm. Frequency-shift maps of the (CH2)n lipid resonance derived from brain MRSI data considering only the ROI (left) versus ROI and ROLI (right) demonstrate the positive impact of the ROLI on lipid artefacts in brain MRSI. Figure 5: EPIs of four slices using 1) no shim, 2) 3rd order dynamic slice-wise updated (DSU) shim without preemphasis, 3) DSU without F0 determination, 4) DSU and 5) static slice-wise shim. Figure 6: Resting-state fMRI activations on unprocessed EPIs, acquired with a 3rd order slice-wise dynamic updated B0 shim with dynamic F0 determination at 7T.
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: article
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