| 惠庆桃,李洁,王周璇,刘高元,罗小兰,马春,明兵.自制辅助匀场装置在1.5T MR甲状腺DWI中的应用[J].中国医学影像技术,2019,35(5):765~768 |
| 自制辅助匀场装置在1.5T MR甲状腺DWI中的应用 |
| Application of self-made auxiliary device for shimming on thyroid DWI with 1.5T MR |
| 投稿时间：2018-11-06 修订日期：2019-03-07 |
| DOI：10.13929/j.1003-3289.201811036 |
| 中文关键词: 甲状腺 扩散磁共振成像 辅助匀场装置 |
| 英文关键词:thyroid gland diffusion magnetic resonance imaging auxiliary device for shimming |
| 基金项目:四川省医学科研青年创新课题（Q14025）。 |
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| 中文摘要: |
| 目的 探讨自制辅助匀场装置对改善1.5T MR甲状腺DWI图像质量的价值。方法 采用灌装高浓度硅油的硅胶袋自制辅助匀场装置，以相同参数对42名健康志愿者进行2次甲状腺DWI扫描（b=0、400、800 s/mm2），第2次扫描时使用自制辅助匀场装置。测量使用匀场装置前后DWI图像中甲状腺和背景图像的信号强度，计算SNR；并对图像质量进行评级。比较使用辅助匀场装置前后的DWI图像SNR及评级的差异。结果 42名志愿者全部完成检查，均无颈部不适或呼吸不畅等不适。在b=400、800 s/mm2 DWI图像中，使用辅助匀场装置后图像质量明显提高，评级差异均有统计学意义（P均<0.001）。使用自制辅助匀场装置前DWI甲状腺SNR分别为3.62[95%CI（1.97，8.10），b=400 s/mm2]和4.41[95%CI（2.62，8.69），b=800 s/mm2]，使用后为10.20[95%CI（4.05，23.23），b=400 s/mm2]和6.79[95%CI（3.24，18.85），b=800 s/mm2]，差异均有统计学意义（P均<0.05）。结论 使用自制辅助匀场装置可明显提高甲状腺DWI图像SNR和图像质量，且使用方便，受试者无不适，值得临床推广使用。 |
| 英文摘要: |
| Objective To investigate the value of self-made auxiliary device for shimming on thyroid DWI, in order to improve image quality. Methods Totally 42 healthy volunteers underwent identical DWI sequence scanning (b=0, 400, 800 s/mm2) twice to obtain images of thyroid, while the auxiliary device-silicone bags filled with high concentratianon silicone oil was used for the second scanning. The signals of thyroid and background noise were measured, and SNR was calculated with and without the device, then image quality was graded. SNR and grading of DWI images before and after using the auxiliary shimming device were compared. Results All 42 volunteers completed the examination and without discomfort such as neck discomfort or poor breathing. For b=400, 800 s/mm2 DWI images, the image quality was greatly improved after using the auxiliary shimming device, and the differences of grading were statistically significant (both P<0.001). SNR of DWI images with the auxiliary shimming device were 10.20 (95% CI[4.05, 23.23], b=400 s/mm2) and 6.79 (95% CI[3.24, 18.85], b=800 s/mm2), much higher than those of DWI images without the device (3.62, 95% CI[1.97, 8.10]; 4.41, 95% CI[2.66, 8.69]) respectively (both P<0.05). Conclusion Using the self-made auxiliary shimming device can significantly improve SNR and image quality of thyroid DWI images, which is easy to use without complaint and worthy of promotion in clinical practice. |
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