Sumikawa Tetsuo, Yabuuchi Hidetake, Sumikawa Chiharu, Nakashima Yoshiteru, Miura Gouji
Department of Radiology, Yamaguchi Prefectural Grand Medical Center, Japan.
Department of Health Sciences, Kyushu University, Japan.
Neuroradiol J. 2020 Feb;33(1):39-47. doi: 10.1177/1971400919870178. Epub 2019 Aug 13.
The purpose of this study was to investigate the influence of blade width and magnetic field strength on apparent diffusion coefficient values of periodically rotated overlapping parallel lines with enhanced reconstruction (PROPELLER) diffusion-weighted imaging in the head and neck at 1.5 and 3.0 T magnetic resonance imaging.
Fifteen healthy volunteers (eight men and seven women; mean age 36.4 ± 10.1 years) underwent PROPELLER diffusion-weighted imaging using four blade widths at 3.0 T and three blade widths at 1.5 T. For the multigroup comparison of apparent diffusion coefficient values, we performed analysis of variance and Tukey-Kramer tests. The apparent diffusion coefficient values in each organ were compared among the different blade widths and magnetic field strengths by a test. Inter and intra-observer agreements regarding apparent diffusion coefficient value measurements were evaluated using the intraclass correlation coefficient.
No significant differences were observed in apparent diffusion coefficient values of the cerebellum in each blade width at both field strengths. The apparent diffusion coefficient values of the right parotid glands were significantly lower for blade width 32 than for blade width 16 at 3.0 T (1.16 × 10 mm/s vs. 1.01 × 10 mm/s; < 0.05). The apparent diffusion coefficient values of bilateral parotid glands were significantly higher at 1.5 T than at 3.0 T. Intraclass correlation coefficients were almost perfect to substantial in the cerebellum, whereas they showed moderate agreement in the parotid glands.
The largest blade width 32 at 3.0 T and high magnetic field strength lowered the apparent diffusion coefficient values of parotid glands of PROPELLER diffusion-weighted imaging. The apparent diffusion coefficient values in the parotid glands of PROPELLER diffusion-weighted imaging may be affected for blade width and magnetic field strength.
本研究旨在探讨叶片宽度和磁场强度对头部和颈部在1.5 T和3.0 T磁共振成像时采用增强重建（螺旋桨）扩散加权成像的周期性旋转重叠平行线表观扩散系数值的影响。
15名健康志愿者（8名男性和7名女性；平均年龄36.4±10.1岁）在3.0 T时使用四种叶片宽度以及在1.5 T时使用三种叶片宽度进行螺旋桨扩散加权成像。对于表观扩散系数值的多组比较，我们进行了方差分析和Tukey-Kramer检验。通过t检验比较不同叶片宽度和磁场强度下各器官的表观扩散系数值。使用组内相关系数评估观察者间和观察者内关于表观扩散系数值测量的一致性。
在两种场强下，各叶片宽度的小脑表观扩散系数值均未观察到显著差异。在3.0 T时，叶片宽度为32时右侧腮腺的表观扩散系数值显著低于叶片宽度为16时（1.16×10⁻³mm²/s对1.01×10⁻³mm²/s；P<0.05）。双侧腮腺的表观扩散系数值在1.5 T时显著高于3.0 T时。组内相关系数在小脑中几乎为完美至高度一致，而在腮腺中显示为中等一致性。
3.0 T时最大叶片宽度32以及高磁场强度降低了螺旋桨扩散加权成像腮腺的表观扩散系数值。螺旋桨扩散加权成像腮腺的表观扩散系数值可能受叶片宽度和磁场强度影响。
