| 杨婧,苗延巍,高冰冰,刘杨颖秋,刘娜,张楠,邴雨.不同加速因子压缩感知技术对大脑磁敏感加权成像质量及核团相位值的影响[J].中国医学影像技术,2022,38(2):286~290 |
| 不同加速因子压缩感知技术对大脑磁敏感加权成像质量及核团相位值的影响 |
| Impact of compressed sensing with different acceleration factors on quality and phase value of nuclei of brain susceptibility weighted imaging |
| 投稿时间：2021-05-13 修订日期：2021-08-25 |
| DOI：10.13929/j.issn.1003-3289.2022.02.028 |
| 中文关键词: 脑 压缩感知 磁共振成像 图像质量 |
| 英文关键词:brain compressed sensing magnetic resonance imaging image quality |
| 基金项目:国家自然科学基金（81671646）、大连市科技创新基金计划（2020JJ27SN075）。 |
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| 中文摘要: |
| 目的 评价不同加速因子（AF）对脑压缩感知（CS）磁敏感加权成像（SWI）质量与灰质核团相位值（PV）的影响。方法 纳入40名健康志愿者，分别采集AF为0、2、4、6、8及10的SWI。对图像质量进行主观评价，测量PV并计算信噪比（SNR）及对比噪声比（CNR）。采用Cohen's Kappa检验评价观察者间评价的一致性；以组内相关系数（ICC）评价观察者内测量PV结果的一致性。比较不同AF下主观评分及各参数测量结果的差异。结果 观察者间主观评分一致性较好（Kappa均>0.60，P均<0.05）。随AF增加，壳核（PUT）和苍白球（GP）之间界线逐渐模糊，以AF=10为著。观察者内测量PV结果的一致性均极好（ICC均>0.80，P均<0.05）。AF≥4时，双侧黑质（SN）、双侧齿状核（DN）的SNR及CNR较AF=0时明显降低（P均<0.05），其他核团则在AF≥6时出现显著差异（P均<0.05）。相比AF=0时，AF=2时双侧SN、DN的PV出现差异（P均<0.05）；AF=10时右侧GP、右侧丘脑枕（PUL）及双侧红核（RN）开始出现差异（P均<0.05），其余核团于各AF下的PV测值均无明显差异（P均>0.05）。结论 利用CS技术可有效缩短SWI时间，AF=2时对大脑图像质量无明显影响，但对部分核团PV测值存在一定影响，尤其是幕下核团。 |
| 英文摘要: |
| Objective To observe the impact of compressed sensing (CS) with different acceleration factor (AF) on quality and phase value (PV) of gray matter nuclei of brain susceptibility weighted imaging (SWI). Methods A total of 40 health volunteers were enrolled. SWI were collected with AF of 0, 2, 4, 6, 8 and 10. The image quality was evaluated subjectively, PV was measured and the signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) were calculated. Cohen's Kappa test was used to evaluate the inter-observer consistency of subjective scoring. The intra-class correlation coefficient (ICC) was used to evaluate the intra-observer consistency of PV measurement. The subjective scores and results of each parameters with different AF were compared. Results The inter-observer consistency of subjective scoring was good (all Kappa>0.60, all P<0.05). The boundary between putamen (PUT) and globus pallidus (GP) tended to become blurred with AF increase, especially when AF=10. The consistency of intra-observer PV measurements was excellent (all ICC>0.80, all P<0.05). When AF ≥ 4, SNR and CNR of bilateral substantia nigra (SN) and bilateral dentate nucleus (DN) were significantly lower than those when AF=0 (all P<0.05), while the other nuclei showed significant differences when AF ≥ 6 (all P<0.05). Compared with those when AF=0, PV of bilateral SN and DN were different when AF=2 (all P<0.05), while PV of the right GP, right pulvinar (PUL) and bilateral red nuclei (RN) became different when AF=10 (all P<0.05). There was no significant difference of PV of the rest nuclei measured under all AF conditions (all P>0.05). Conclusion The scanning time could be effectively shorten using CS without significant impact on image quality of brain when AF=2, but had impact on PV measurements of some nuclei, especially of subtentorial nuclei. |
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