海奇:胎儿多扩散加权核磁共振成像中扭曲和运动校正的框架
Haykel Snoussi1, Davood Karimi1, Onur Afacan1
1Boston Children's Hospital, and Harvard Medical School, Boston, MA 02115 USA.
ArXiv
|July 9, 2024
概括
HAITCH是一个新的,开源工具,可以纠正和重建高角度分辨率的胎儿扩散MRI数据. 它显著提高了数据质量,使发育中的胎儿大脑微观结构能够可靠地分析.
科学领域:
- 神经成像是一种神经成像.
- 生物医学工程 生物医学工程
- 发育神经科学的发展神经科学.
背景情况:
- 扩散MRI (dMRI) 对于研究胎儿大脑发育至关重要.
- 胎儿运动和磁场的不均性会导致人工物,损害dMRI数据质量.
- 高角分辨率的胎儿dMRI特别容易受到低信号噪声比和人工物的影响.
研究的目的:
- 介绍HAITCH,这是第一个用于纠正和重建多高角度分辨率胎儿dMRI数据的开源工具.
- 为了解决由胎儿运动和磁场变化引起的文物和数据散射.
- 提高胎儿dMRI分析的可靠性和一致性.
主要方法:
- 开发了HAITCH,结合了闪反转双回声获取以纠正扭曲.
- 实现了先进的,无模型的运动校正,以实现强大的重建.
- 采用了优化的多设计,以改善信息捕获和运动耐受性.
- 集成的异常值检测,以提高重建准确度.
主要成果:
- HAITCH在纠正各种胎儿年龄和运动水平的文物方面取得了显著的改进.
- 该工具成功重建了高准确度的胎儿dMRI数据.
- 实现了多,多回声胎儿dMRI数据的准确校正和重建,性能优于现有的工具.
- 在真实的胎儿dMRI扫描上得到验证,显示出卓越的性能.
结论:
- 对于处理具有挑战性的胎儿dMRI数据,HAITCH提供了一个强大的解决方案.
- 重建的数据适用于先进的扩散建模,包括光纤方向分布函数估计.
- 这一进步有助于更可靠地分析胎儿大脑微观结构和轨道图.
相关概念视频
01:02¹H NMR: Interpreting Distorted and Overlapping Signals
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
01:05Atomic Nuclei: Magnetic Resonance
The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
01:14NMR Spectrometers: Resolution and Error Correction
When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
01:24Magnetic Resonance Imaging
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...
01:12Double Resonance Techniques: Overview
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
01:27Imaging Studies IV: Magnetic Resonance Imaging
Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...