Impact of arm position on vertebral bone marrow proton density fat fraction in chemical-shift-encoded magnetic resonance imaging: a preliminary study

Quantitative Imaging in Medicine and Surgery

article

Tatsuya Hayashi¹  Shimpei Yano²  Shuhei Shibukawa³  Shinya Kojima¹  Toshimune Ito¹  Hiroshi Oba⁵  Hiroshi Kondo⁵  Asako Yamamoto⁵  Takahide Okamoto¹ 

[1]Graduate School of Medical Technology , Teikyo University

[2]Central of Radiology , Teikyo University Hospital

[3]Department of Radiological Technology , Juntendo University

[4]Center for Evolutionary Cognitive Sciences, Graduate School of Art and Sciences , The University of Tokyo

[5]Department of Radiology , Teikyo University School of Medicine

关键词: Bone marrow fat;    chemical shift;    DIXON;    proton density fat fraction (PDFF);    magnetic resonance imaging (MRI);   

DOI  :  10.21037/qims-22-396

学科分类：外科医学

来源: AME Publications

【 摘 要 】

Arm positions employed during magnetic resonance imaging (MRI) can affect magnetic field distribution, which may result in variability in proton density fat fraction (PDFF) measurements. This study evaluated the effect of arm position on lumbar PDFF measured using chemical-shift-encoded MRI (CSE-MRI).Fifteen healthy volunteers from a single-center underwent lumbar CSE-MRI at two different arm positions (side and elevated) using a single 3T scanner. Scans were performed twice in each position. PDFFs of the L1–L5 vertebrae were independently measured by two readers, and reader measurements were compared by calculating intraclass correlation coefficients (ICC).We compared0.05); however, PDFF for the elevated arm position was significantly higher than that for the side arm position (37.9–44.8% vs. 37.0–43.8%; all P<0.05), except at the L2 level by reader 2. The mean differences in PDFF measurements from the first and second scans [0.1%; 95% limits of agreement (LoA), −1.8% to 1.9%] and from the side arm and elevated arm positions (0.8%; 95% LoA, −1.6% to 3.2%) were small. In conclusion, these preliminary data suggest that different arm positions during CSE-MRI can slightly affect lumbar PDFF; however, the mean absolute differences were very small.

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