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- W3109344210 endingPage "2015" @default.
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- W3109344210 abstract "Purpose UTE sequences typically acquire data during the ramping up of the gradient fields, which makes UTE imaging prone to eddy current and system delay effects. The purpose of this work was to use a simple gradient impulse response function (GIRF) measurement to estimate the real readout gradient waveform and to demonstrate that precise knowledge of the gradient waveform is important in the context of high‐resolution UTE musculoskeletal imaging. Methods The GIRF was measured using the standard hardware of a 3 Tesla scanner and applied on 3D radial UTE data (TE: 0.14 ms). Experiments were performed on a phantom, in vivo on a healthy knee, and in vivo on patients with spine fractures. UTE images were reconstructed twice, first using the GIRF‐corrected gradient waveforms and second using nominal‐corrected waveforms, correcting for the low‐pass filter characteristic of the gradient chain. Results Images reconstructed with the nominal‐corrected gradient waveforms exhibited blurring and showed edge artifacts. The blurring and the edge artifacts were reduced when the GIRF‐corrected gradient waveforms were used, as shown in single‐UTE phantom scans and in vivo dual‐UTE gradient‐echo scans in the knee. Further, the importance of the GIRF‐based correction was indicated in UTE images of the lumbar spine, where thin bone structures disappeared when the nominal correction was employed. Conclusion The presented GIRF‐based trajectory correction method using standard scanner hardware can improve the quality of high‐resolution UTE musculoskeletal imaging." @default.
- W3109344210 created "2020-12-07" @default.
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- W3109344210 date "2020-11-30" @default.
- W3109344210 modified "2023-10-07" @default.
- W3109344210 title "Trajectory correction based on the gradient impulse response function improves high‐resolution UTE imaging of the musculoskeletal system" @default.
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- W3109344210 doi "https://doi.org/10.1002/mrm.28566" @default.
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