University of Twente Student Theses
Rapid Frequency Offset Mapping with the Half Fourier Acquisition Single-Shot Turbo Spin-Echo with the Selective Parity Approach
De Alba Alvarez, Irina (2022) Rapid Frequency Offset Mapping with the Half Fourier Acquisition Single-Shot Turbo Spin-Echo with the Selective Parity Approach.
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| Abstract: | Frequency Offset (FO) maps are widely used to correct image distortion and signal loss when magnetic resonance imagine sequences, which are sensitive to field inhomogeneities, are used. The state-of-the-art requires several image acquisitions at different echo times to map the off-resonance frequencies generated by the magnetic field inhomogeneities. This work compares the state-of-the-art method using a modified Half Fourier Acquisition Single-Shot Turbo Spin-Echo (HASTE) sequence with a new proposed method using a Selective Parity (SP) HASTE approach to create FO maps. The SP-HASTE approach needs one single image acquisition followed by image processing to create a frequency offset map. In the experiment different echo times acquisitions were performed to compare the resulting frequency offset maps. Statistical comparison of the results of the SP-HASTE approach and the HASTE were done revealing a comparable agreement between the two methods. They showed a large correlation with values of 1+/-0.05 in the linear regression and not significant frequency differences. The SP-HASTE approach showed a significant reduction in the necessary time to achieve a frequency offset map using one single image acquisition. |
| Item Type: | Essay (Master) |
| Faculty: | TNW: Science and Technology |
| Subject: | 30 exact sciences in general |
| Programme: | Biomedical Engineering MSc (66226) |
| Link to this item: | https://purl.utwente.nl/essays/90615 |
| Export this item as: | BibTeX EndNote HTML Citation Reference Manager |
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