Angeliki Stamatelatou, Carlijn Tenbergen, Sahar Nassirpour, Paul Chang, Jack van Asten, Arend Heerschap, Tom Scheenen
{"title":"使用附加的局部外部垫片线圈阵列改善前列腺磁共振成像和光谱中的磁场均匀性。","authors":"Angeliki Stamatelatou, Carlijn Tenbergen, Sahar Nassirpour, Paul Chang, Jack van Asten, Arend Heerschap, Tom Scheenen","doi":"10.1007/s10334-025-01290-y","DOIUrl":null,"url":null,"abstract":"<p><strong>Objective: </strong>To improve B<sub>0</sub> field homogeneity in prostate MR imaging and spectroscopy using a custom-designed 16-channel external local shim coil array.</p><p><strong>Methods: </strong>In vivo prostate imaging was performed in seven healthy volunteers (mean age: 40.7 years) without bowel preparation. A simulation study determined the most robust configuration of the add-on shim coil together with shim coils from the MR system. The combination of the add-on shim coil array with 1st-order shims of the MR scanner was used and compared to the MR system's reference standard of conventional 1st and 2nd-order shimming. Performance was evaluated using the standard deviation (SD) of off-resonance frequencies (ΔB<sub>0</sub>) from B<sub>0</sub>-maps, the distortion of diffusion-weighted images (DWI) by the Dice similarity coefficient (DSC) with reference to T<sub>2</sub>W images, and the citrate linewidths of <sup>1</sup>H-MR spectroscopic imaging (<sup>1</sup>H-MRSI) of the prostate.</p><p><strong>Results: </strong>Overall, improvements were made with the combination of coils, with DSC rising from 0.90 ± 0.02 to 0.92 ± 0.02 (p = 0.01), a reduction in the SD of ΔB<sub>0</sub> from 18.5 ± 4.7 Hz to 16.5 ± 3.6 Hz, and a decrease in citrate linewidths from 8.3 ± 5.7 Hz to 7.9 ± 3.6 Hz (p = 0.018), all compared to the reference standard of conventional 1st and 2nd-order shimming.</p><p><strong>Conclusion: </strong>A dedicated external shim coil array can improve B0 homogeneity in the prostate, enhancing image quality and precision in multi-parametric MRI.</p>","PeriodicalId":18067,"journal":{"name":"Magnetic Resonance Materials in Physics, Biology and Medicine","volume":" ","pages":""},"PeriodicalIF":2.5000,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Improving magnetic field homogeneity in prostate MR imaging and spectroscopy using an add-on local external shim coil array.\",\"authors\":\"Angeliki Stamatelatou, Carlijn Tenbergen, Sahar Nassirpour, Paul Chang, Jack van Asten, Arend Heerschap, Tom Scheenen\",\"doi\":\"10.1007/s10334-025-01290-y\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><strong>Objective: </strong>To improve B<sub>0</sub> field homogeneity in prostate MR imaging and spectroscopy using a custom-designed 16-channel external local shim coil array.</p><p><strong>Methods: </strong>In vivo prostate imaging was performed in seven healthy volunteers (mean age: 40.7 years) without bowel preparation. A simulation study determined the most robust configuration of the add-on shim coil together with shim coils from the MR system. The combination of the add-on shim coil array with 1st-order shims of the MR scanner was used and compared to the MR system's reference standard of conventional 1st and 2nd-order shimming. Performance was evaluated using the standard deviation (SD) of off-resonance frequencies (ΔB<sub>0</sub>) from B<sub>0</sub>-maps, the distortion of diffusion-weighted images (DWI) by the Dice similarity coefficient (DSC) with reference to T<sub>2</sub>W images, and the citrate linewidths of <sup>1</sup>H-MR spectroscopic imaging (<sup>1</sup>H-MRSI) of the prostate.</p><p><strong>Results: </strong>Overall, improvements were made with the combination of coils, with DSC rising from 0.90 ± 0.02 to 0.92 ± 0.02 (p = 0.01), a reduction in the SD of ΔB<sub>0</sub> from 18.5 ± 4.7 Hz to 16.5 ± 3.6 Hz, and a decrease in citrate linewidths from 8.3 ± 5.7 Hz to 7.9 ± 3.6 Hz (p = 0.018), all compared to the reference standard of conventional 1st and 2nd-order shimming.</p><p><strong>Conclusion: </strong>A dedicated external shim coil array can improve B0 homogeneity in the prostate, enhancing image quality and precision in multi-parametric MRI.</p>\",\"PeriodicalId\":18067,\"journal\":{\"name\":\"Magnetic Resonance Materials in Physics, Biology and Medicine\",\"volume\":\" \",\"pages\":\"\"},\"PeriodicalIF\":2.5000,\"publicationDate\":\"2025-09-11\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Magnetic Resonance Materials in Physics, Biology and Medicine\",\"FirstCategoryId\":\"3\",\"ListUrlMain\":\"https://doi.org/10.1007/s10334-025-01290-y\",\"RegionNum\":4,\"RegionCategory\":\"医学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Magnetic Resonance Materials in Physics, Biology and Medicine","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.1007/s10334-025-01290-y","RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING","Score":null,"Total":0}
Improving magnetic field homogeneity in prostate MR imaging and spectroscopy using an add-on local external shim coil array.
Objective: To improve B0 field homogeneity in prostate MR imaging and spectroscopy using a custom-designed 16-channel external local shim coil array.
Methods: In vivo prostate imaging was performed in seven healthy volunteers (mean age: 40.7 years) without bowel preparation. A simulation study determined the most robust configuration of the add-on shim coil together with shim coils from the MR system. The combination of the add-on shim coil array with 1st-order shims of the MR scanner was used and compared to the MR system's reference standard of conventional 1st and 2nd-order shimming. Performance was evaluated using the standard deviation (SD) of off-resonance frequencies (ΔB0) from B0-maps, the distortion of diffusion-weighted images (DWI) by the Dice similarity coefficient (DSC) with reference to T2W images, and the citrate linewidths of 1H-MR spectroscopic imaging (1H-MRSI) of the prostate.
Results: Overall, improvements were made with the combination of coils, with DSC rising from 0.90 ± 0.02 to 0.92 ± 0.02 (p = 0.01), a reduction in the SD of ΔB0 from 18.5 ± 4.7 Hz to 16.5 ± 3.6 Hz, and a decrease in citrate linewidths from 8.3 ± 5.7 Hz to 7.9 ± 3.6 Hz (p = 0.018), all compared to the reference standard of conventional 1st and 2nd-order shimming.
Conclusion: A dedicated external shim coil array can improve B0 homogeneity in the prostate, enhancing image quality and precision in multi-parametric MRI.
期刊介绍：
MAGMA is a multidisciplinary international journal devoted to the publication of articles on all aspects of magnetic resonance techniques and their applications in medicine and biology. MAGMA currently publishes research papers, reviews, letters to the editor, and commentaries, six times a year. The subject areas covered by MAGMA include:
advances in materials, hardware and software in magnetic resonance technology,
new developments and results in research and practical applications of magnetic resonance imaging and spectroscopy related to biology and medicine,
study of animal models and intact cells using magnetic resonance,
reports of clinical trials on humans and clinical validation of magnetic resonance protocols.
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