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B₁-纠正的乳房T₁映射在超低场的地图

Sheng Shen^1,2, Neha Koonjoo^1,2, Stephen E Ogier^3,4

¹A.A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Boston, Massachusetts, USA.

Magnetic resonance in medicine

|June 16, 2025

概括

这项研究引入了一种高效的超低场 (ULF) 核磁共振技术,用于准确地绘制乳腺组织的T1图谱. 该方法纠正B1不均性,提供可靠的T1值,没有脂肪抑制.

科学领域:

医疗成像医学成像
磁共振成像技术磁共振成像技术
生物物理学的生物物理.

背景情况:

准确的T1映射对于各种组织的定量MRI至关重要.
B1场的不均性对T1映射精度构成重大挑战,特别是在超低场 (ULF) MRI中.
开发无偏差的T1映射方法对于可靠的诊断应用至关重要.

研究的目的:

开发一种高效的T1映射方法用于超低场 (ULF) MRI,以纠正B1不均性.
在没有脂肪抑制的情况下,在6.5mT时确定乳腺组织的T1值.
在体外和体内验证开发的T1映射方法.

主要方法:

采用可变翻转角度方法同时绘制T1和B1.
B1地图被用来纠正T1地图,提高准确性.
该方法使用硫酸铜幻影和乳房幻影得到验证,随后对健康志愿者的体内扫描进行了验证.

主要成果:

在幻象中测量T1地图显示,与参考T1值的偏差不到13%.
对于超过50毫秒的参考T1值,偏差小于6%.
在6.5mT的健康志愿者的乳腺组织体内T1图显示25至75百分点,从79至243 ms.

结论:

可变翻转角度方法在ULF同时进行B1和T1映射时有效.
这种方法可以在ULFMRI中实现高效且准确的体内T1映射.
该研究为乳腺组织提供了6.5mT的T1参考值.

关键词:

T1映射 T1映射 T1映射 T1映射乳房核磁共振成像超低电场的超低电场是什么可变的翻转角度方法.

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Magnetic Resonance Imaging

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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...