相关实验视频

Updated: May 29, 2025

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

Published on: June 9, 2016

在磁粒子成像中的系统矩阵任意超分辨率的连续隐性神经表示

Zhaoji Miao¹, Liwen Zhang^2,3, Jie Tian^1,4,2,5

¹School of Computer Science and Engineering, Southeast University, Nanjing 211189, People's Republic of China.

Physics in medicine and biology

|February 6, 2025

概括

这项研究引入了一种新的磁粒子成像 (MPI) 系统矩阵校准方法,使用连续隐式神经表示. 它可以使用单一模型实现任意规模的超级分辨率,大大降低成本并提高效率.

科学领域:

医疗成像医学成像
计算成像技术的成像
纳米技术纳米技术

背景情况:

磁粒子成像 (MPI) 是一种使用磁场检测磁纳米粒子的新技术.
基于系统矩阵 (SM) 的重建对于MPI图像质量至关重要.
目前的SM校准是耗时的,需要经常重新校准,这阻碍了实际应用.

研究的目的:

为了加速磁粒子成像 (MPI) 中的系统矩阵 (SM) 校准过程.
为SM回收开发一种任意规模的超级分辨率方法,克服现有的低采样方法的局限性.
为了减少与SM校准相关的存储和培训时间成本.

主要方法:

提出了一种任意规模的SM超分辨率方法,利用连续隐式神经表示 (INR).
通过调整采样密度,模拟SM作为连续空间函数,以实现灵活的超分辨率.
实现了交叉频率编码器,用于共享频率信息和上下文分析,并与CNN相结合,以优化INR中的网格采样.

主要成果:

拟议的基于INR的方法在OpenMPI数据集上的现有技术相比显示出更高的性能.
实现了准确而高效的SM回收,即使在高低样本率下.
在任何尺度上使用单个训练模型启用校准.

结论:

这种新方法显著降低了MPI SM校准的计算成本和存储需求.
通过使用统一模型实现任意规模的超级分辨率,为MPI系统提供了更高的灵活性和效率.
通过更实用的校准程序,为MPI技术的更广泛采用铺平了道路.

关键词:

隐含的神经表现隐含的神经表现磁性颗粒成像技术磁性粒子成像技术医学成像医学成像超级分辨率的超级分辨率系统矩阵是一个系统矩阵.

更多相关视频

High-resolution Structural Magnetic Resonance Imaging of the Human Subcortex In Vivo and Postmortem

High-resolution Structural Magnetic Resonance Imaging of the Human Subcortex In Vivo and Postmortem

Published on: December 30, 2015

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Published on: July 20, 2022

相关概念视频

Magnetic Resonance Imaging

Magnetic 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...

NMR Spectrometers: Resolution and Error Correction

NMR 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...

Atomic Nuclei: Magnetic Resonance

Atomic 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...

Super-resolution Fluorescence Microscopy

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...