在应用压缩感应超极化-129肺部MRI时采样模式的差异
Mitra Tavakkoli1,2, Sarah Svenningsen3,4,5, Yonni Friedlander3
1Imaging Research Centre, St. Joseph's Healthcare Hamilton, Hamilton, Ontario, Canada.
NMR in biomedicine
|February 29, 2024
概括
在超极化129XeMRI通风成像中,随机低采样会产生显著的图像质量变化,特别是在60%以下的采样. 优化采样模式对于压缩传感在高度低样本的129Xe肺数据集中有效至关重要.
科学领域:
- 医疗成像医学成像
- 肺部病理学 肺部病理学
- 磁共振成像是一种磁共振成像技术.
背景情况:
- 超极化 (HP) 129Xe通风MRI允许屏息成像,但对患者来说具有挑战性.
- 压缩传感 (CS) 加快了MRI采集,但低样本图像有所不同.
- 像SNR和SSIM这样的图像质量指标对低采样模式敏感.
研究的目的:
- 调查随机下样本对HP 129Xe肺透气MRI质量的影响.
- 为了确定可靠的CS重建所需的最低采样比率.
- 突出了129XeMRI中CS优化采样模式的重要性.
主要方法:
- 在20名受试者 (10名健康,10名喘患者) 中获得了全样本的2D多切片HP 129Xe肺透气图像.
- 在10%至80%的比率下生成了500个随机亚样本模式.
- 使用并行成像和压缩传感 (PICS) 重建图像,并将SNR,SSIM和侧叶与峰值比较.
主要成果:
- 在所有比率的不同随机下样本模式中观察到SNR和SSIM的显著变化.
- 图像质量指标的变化随着更高的低样本增加.
- 随机低抽样率低于60%的抽样比率导致了实质性的变化,尽管满足了CS不一致性标准.
结论:
- 随机低样本对HP 129XeMRI在低样本比率 (<60%) 构成重大挑战.
- 图像质量的变化需要仔细考虑采样模式.
- 优化采样模式对于最大化CS在高度低采样129Xe肺MRI中的潜力至关重要.
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