相关实验视频

Updated: Sep 10, 2025

Scattering And Absorption of Light in Planetary Regoliths

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

晶体间散射事件对SIAT aPET性能的影响

Zhonghua Kuang^1,2, Ling Zhang¹, Ning Ren²

¹Microelectronics and Optoelectronics Technology Key Laboratory of Hunan Higher Education, School of Physics and Electronic Electrical Engineering, Xiangnan University, Chenzhou 423000, People's Republic of China.

Physics in medicine and biology

|August 21, 2025

概括

在正电子发射断层扫描仪 (PET) 中,晶体间散射 (ICS) 事件会影响图像质量. 识别和排除ICS事件可以改善小动物PET成像中的空间分辨率和对比度恢复.

科学领域:

医学物理
核成像技术
生物医学工程

背景情况:

聚子发射断层扫描仪 (PET) 容易受到511 keV马射线的晶体间散射 (ICS).
ICS事件可以降低PET成像中的图像质量和空间分辨率.

研究的目的:

调查ICS事件对SIAT小型动物PET扫描仪的性能的影响.
评估识别和潜在拒绝ICS事件的有效性,以改善图像重建.

主要方法:

在SIAT aPET扫描仪中开发了一种区分单次相互作用 (非ICS) 和ICS事件的方法.
使用SIAT aPET扫描仪扫描各种幻影 (点源,热棒,NEMA IQ).
使用所有事件,非ICS事件和ICS事件单独重建图像.

主要成果:

与所有事件 (0. 62 mm) 和ICS事件 (0. 97 mm) 相比,非ICS事件的空间分辨率更高 (0. 52 mm FWHM).
拒绝ICS事件改善了对比度恢复 (平均为1-5毫米棒的24%),但在均区域降低了信号与噪声的比率 (46%).
在非ICS事件中,1. 0毫米棒的解析显示出高峰与低谷的比率提高了40%;在ICS事件中,1. 35毫米棒的解析显示出高峰与低谷的比率提高了40%.

结论:

在PET成像中,ICS事件显著影响空间分辨率和对比度恢复.
在PET扫描仪中实施ICS事件识别的决定取决于所需的分辨率,对比度和信号噪声比率之间的权衡.

关键词:

对比度晶体间的散射敏感性小动物PET 空间分辨率

更多相关视频

Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope

Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope

Published on: May 28, 2016

Spark Plasma Sintering Apparatus Used for the Formation of Strontium Titanate Bicrystals

Spark Plasma Sintering Apparatus Used for the Formation of Strontium Titanate Bicrystals

Published on: February 9, 2017

相关概念视频

Atomic Absorption Spectroscopy: Interference

Atomic Absorption Spectroscopy: Interference

Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...

Inductively Coupled Plasma-Mass Spectrometry (ICP-MS): Interferences

Inductively Coupled Plasma-Mass Spectrometry (ICP-MS): Interferences

Inductively coupled plasma–mass spectrometry (ICP–MS) is a highly selective and sensitive technique for accurate elemental analysis. Though the analysis of ICP–MS mass spectra is comparatively straightforward, it is affected by spectroscopic and non-spectroscopic interferences. Spectroscopic interferences arise when the plasma contains ionic species with an m/z value the same as the analyte ion. Spectroscopic interference can be categorized as isobaric, polyatomic ions, and...

X-ray Crystallography

X-ray Crystallography

The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...