{"title":"主要唾液腺的体素内非相干运动扩散加权成像(IVIM-DWI): b值的最佳数量和组合的评估。","authors":"Mitsuhiro Kimura, Hidetake Yabuuchi, Hiroshi Narita, Yoichi Kurihara, Kiyoshi Hisada, Noriyuki Sakai, Kazuya Nagatomo, Ryoji Mikayama, Masafumi Masaki, Hiroshi Kimura","doi":"10.5114/pjr.2022.116167","DOIUrl":null,"url":null,"abstract":"<p><strong>Purpose: </strong>To examine the optimal number and combination of <i>b</i>-values in intravoxel incoherent motion (IVIM) diffusionweighted imaging (DWI) of the major salivary glands.</p><p><strong>Material and methods: </strong>IVIM-DWI was performed on 10 healthy volunteers using 13 <i>b</i>-values (low <i>b</i>-values: 0-100 s/mm<sup>2</sup>; high <i>b</i>-values: 200-1000 s/mm<sup>2</sup>). The IVIM parameters and apparent diffusion coefficient of the bilateral major salivary glands were calculated using 13 <i>b</i>-values and were considered the standard values. We sequentially reduced the number of <i>b</i>-values to 10, 8, 6, and 5. The parameters in each combination were calculated. The standard values were compared with the parameters from each reduced <i>b</i>-value in IVIM-DWI. The Wilcoxon signed-rank test was used to determine whether there were any differences between the parameters in each combination. Bonferroni correction was conducted for multiple comparisons.</p><p><strong>Results: </strong>There were no significant differences between the standard values and parameters from the 2 combinations of 6 <i>b</i>-values. However, significant differences were observed between the standard values and parameters from some combinations of only 2 low or only 2 high <i>b</i>-values.</p><p><strong>Conclusions: </strong>IVIM-DWI of the major salivary glands could be performed using a minimum of 6 <i>b</i>-values. However, they should contain 3 low and 3 high <i>b</i>-values.</p>","PeriodicalId":47128,"journal":{"name":"Polish Journal of Radiology","volume":null,"pages":null},"PeriodicalIF":0.9000,"publicationDate":"2022-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/49/6c/PJR-87-47010.PMC9215303.pdf","citationCount":"0","resultStr":"{\"title\":\"Intravoxel incoherent motion diffusion-weighted imaging (IVIM-DWI) of the major salivary glands: an assessment of the optimal number and combination of <i>b</i>-values.\",\"authors\":\"Mitsuhiro Kimura, Hidetake Yabuuchi, Hiroshi Narita, Yoichi Kurihara, Kiyoshi Hisada, Noriyuki Sakai, Kazuya Nagatomo, Ryoji Mikayama, Masafumi Masaki, Hiroshi Kimura\",\"doi\":\"10.5114/pjr.2022.116167\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><strong>Purpose: </strong>To examine the optimal number and combination of <i>b</i>-values in intravoxel incoherent motion (IVIM) diffusionweighted imaging (DWI) of the major salivary glands.</p><p><strong>Material and methods: </strong>IVIM-DWI was performed on 10 healthy volunteers using 13 <i>b</i>-values (low <i>b</i>-values: 0-100 s/mm<sup>2</sup>; high <i>b</i>-values: 200-1000 s/mm<sup>2</sup>). The IVIM parameters and apparent diffusion coefficient of the bilateral major salivary glands were calculated using 13 <i>b</i>-values and were considered the standard values. We sequentially reduced the number of <i>b</i>-values to 10, 8, 6, and 5. The parameters in each combination were calculated. The standard values were compared with the parameters from each reduced <i>b</i>-value in IVIM-DWI. The Wilcoxon signed-rank test was used to determine whether there were any differences between the parameters in each combination. Bonferroni correction was conducted for multiple comparisons.</p><p><strong>Results: </strong>There were no significant differences between the standard values and parameters from the 2 combinations of 6 <i>b</i>-values. However, significant differences were observed between the standard values and parameters from some combinations of only 2 low or only 2 high <i>b</i>-values.</p><p><strong>Conclusions: </strong>IVIM-DWI of the major salivary glands could be performed using a minimum of 6 <i>b</i>-values. However, they should contain 3 low and 3 high <i>b</i>-values.</p>\",\"PeriodicalId\":47128,\"journal\":{\"name\":\"Polish Journal of Radiology\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.9000,\"publicationDate\":\"2022-05-06\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/49/6c/PJR-87-47010.PMC9215303.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Polish Journal of Radiology\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.5114/pjr.2022.116167\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"2022/1/1 0:00:00\",\"PubModel\":\"eCollection\",\"JCR\":\"Q4\",\"JCRName\":\"RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Polish Journal of Radiology","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.5114/pjr.2022.116167","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2022/1/1 0:00:00","PubModel":"eCollection","JCR":"Q4","JCRName":"RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING","Score":null,"Total":0}
Intravoxel incoherent motion diffusion-weighted imaging (IVIM-DWI) of the major salivary glands: an assessment of the optimal number and combination of b-values.
Purpose: To examine the optimal number and combination of b-values in intravoxel incoherent motion (IVIM) diffusionweighted imaging (DWI) of the major salivary glands.
Material and methods: IVIM-DWI was performed on 10 healthy volunteers using 13 b-values (low b-values: 0-100 s/mm2; high b-values: 200-1000 s/mm2). The IVIM parameters and apparent diffusion coefficient of the bilateral major salivary glands were calculated using 13 b-values and were considered the standard values. We sequentially reduced the number of b-values to 10, 8, 6, and 5. The parameters in each combination were calculated. The standard values were compared with the parameters from each reduced b-value in IVIM-DWI. The Wilcoxon signed-rank test was used to determine whether there were any differences between the parameters in each combination. Bonferroni correction was conducted for multiple comparisons.
Results: There were no significant differences between the standard values and parameters from the 2 combinations of 6 b-values. However, significant differences were observed between the standard values and parameters from some combinations of only 2 low or only 2 high b-values.
Conclusions: IVIM-DWI of the major salivary glands could be performed using a minimum of 6 b-values. However, they should contain 3 low and 3 high b-values.
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