检索结果-内蒙古大学图书馆

arXiv 2024年

作者： Zhang, Xin Xie, Jixiong Tan, Yuhang Su, Ting Zhu, Jiongtao Cui, Han Xia, Dongmei Zheng, Hairong Liang, Dong Ge, Yongshuai Research Center for Advanced Detection Materials and Medical Imaging Devices Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Guangdong Shenzhen518055 China University of Chinese Academy of Sciences Beijing100049 China Key Laboratory of Low-grade Energy Utilization Technologies and Systems Ministry of Education of China College of Power Engineering Chongqing University Chongqing400044 China Paul C Lauterbur Research Center for Biomedical Imaging Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Guangdong Shenzhen518055 China Key Laboratory of Biomedical Imaging Science and System Chinese Academy of Sciences Guangdong Shenzhen518055 China National Innovation Center for Advanced Medical Devices Guangdong Shenzhen518131 China

Background: Recently, the popularity of dual-layer flat-panel detector (DL-FPD) based dual-energy cone-beam CT (CBCT) imaging has been increasing. However, the image quality of dual-energy CBCT remains constrained by the Compton scattered X-ray photons. Purpose: The objective of this study is to develop an novel scatter correction method, named as e-Grid, for DL-FPD based CBCT imaging. Methods: In DL-FPD, a certain portion of the X-ray photons (mainly low-energy primary and scattered photons) passing through the object are captured by the top detector layer, while the remaining X-ray photons (mainly high-energy primary and scattered photons) are collected by the bottom detector layer. Based on the two set of distinct low-energy and high-energy measurements, a linear signal model was approximated for the dual-energy primary and scattered signals on DL-FPD. The distributions of X-ray scatters were quickly estimated using this signal model. Monte Carlo (MC) simulation of a water phantom was conducted to verify this newly developed scatter estimation method. Moreover, physical experiments of water phantom, head phantom, and abdominal phantom were carried out to validate the real performance of this proposed scatter correction method. Results: The MC results showed that the e-Grid method was able to generate scatter distributions close to the ground truth. Moreover, the physical experiments demonstrated that the e-Grid method can greatly reduce the shading artifacts in both low-energy and high-energy CBCT images acquired from DL-FPD. On average, the image non-uniformity (NU) was reduced by over 77% in the low-energy CBCT image and by over 66% in the high-energy CBCT image. A a consequence, the accuracy of the decomposed multi-material bases was substantially improved. Conclusion: The Compton scattered X-ray signals could be quickly corrected using the proposed e-Grid method for DL-FPD based dual-energy CBCT imaging systems. Copyright © 2024, The Authors. All rights reser

关键词： Particle beams

来源：评论

学校读者我要写书评

暂无评论

Scatter correction for photon-counting detector based CBCT imaging

arXiv

引用

arXiv 2024年

作者： Zhang, Xin Su, Ting Zhu, Jiongtao Zheng, Hairong Liang, Dong Ge, Yongshuai Research Center for Advanced Detection Materials and Medical Imaging Devices Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Guangdong Shenzhen518055 China University of Chinese Academy of Sciences Beijing100049 China Paul C Lauterbur Research Center for Biomedical Imaging Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Guangdong Shenzhen518055 China Key Laboratory of Biomedical Imaging Science and System Research Center for Medical Artificial Intelligence Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Guangdong Shenzhen518055 China National Innovation Center for Advanced Medical Devices Guangdong Shenzhen518131 China

Objective: The aim of this study is to validate the effectiveness of an energy-modulated scatter correction method in suppressing scatter in photon-counting detector (PCD)-based cone beam CT (CBCT) imaging. Approach: The scatter correction method, named e-Grid, which was initially applied to dual-layer flat-panel detector (DLFPD)-based CBCT imaging, was tested for its performance in PCD-CBCT imaging. Benchtop PCD-CBCT imaging experiments were conducted to verify the effectiveness of the e-Grid method. Additionally, quantitative metrics were measured from these experimental results. Main results: It was found that the use of the e-Grid method could significantly eliminate cupping artifacts caused by Compton scatter in PCD-CBCT imaging. Meanwhile, its effectiveness was observed in both low- and high-energy images, as well as for objects of varying sizes. Quantitative results showed that the e-Grid method could reduce scatter artifacts by at least 71% in low-energy images and 75% in high-energy images. Significance: It was demonstrated that the scatter correction method originally applied to DLFPD-based CBCT could also perform well in PCD-CBCT, showing that the e-Grid method has great potential for application in other spectral CBCT imaging systems. Copyright © 2024, The Authors. All rights reserved.

关键词： Photons

来源：评论

学校读者我要写书评

暂无评论

短波红外荧光成像活体监测和评估植入的M2巨噬细胞在骨骼肌再生中的作用（英文）

引用

Engineering 2024年第2期 283-294页

作者： Mo Chen Yuzhou Chen Sijia Feng Shixian Dong Luyi Sun Huizhu Li Fuchun Chen Nguyen Thi Kim Thanh Yunxia Li Shiyi Chen You Wang Jun Chen Sports Medicine Institute of Fudan University Department of Sports Medicine Huashan Hospital Fudan University Department of Bone and Joint Surgery Department of Orthopedics Renji Hospital School of Medicine Shanghai Jiao Tong University Department of Anatomy and Physiology School of Medicine Shanghai Jiao Tong University Key Laboratory of Infrared System Detection & Imaging Technology Shanghai Institute of Technical Physics Chinese Academy of Sciences Biophysics Group Department of Physics and Astronomy University College London Healthcare Biomagnetics and Nanomaterials Laboratories University College London

Skeletal muscle has a robust regeneration ability that is impaired by severe injury,disease,and *** in a decline in skeletal muscle ***,improving skeletal muscle regeneration is a key challenge in treating skeletal muscle-related *** to their significant role in tissue regeneration,implantation of M2 macrophages(M2M?) has great potential for improving skeletal muscle ***,we present a short-wave infrared(SWIR) fluorescence imaging technique to obtain more in vivo information for an in-depth evaluation of the skeletal muscle regeneration effect after M2M? *** fluorescence imaging was employed to track implanted M2M? in the injured skeletal muscle of mouse *** is found that the implanted M2M? accumulated at the injury site for two ***,SWIR fluorescence imaging of blood vessels showed that M2M? implantation could improve the relative perfusion ratio on day 5(1.09±0.09 vs 0.85±0.05;p=0.01) and day 9(1.38±0.16 vs 0.95±0.03;p=0.01) post-injury,as well as augment the degree of skeletal muscle regencration on day 13 ***,multiple linear regression analyses determined that post-injury time and relative perfusion ratio could be used as predictive indicators to evaluate skeletal muscle *** results provide more in vivo details about M2M? in skeletal muscle regeneration and confirm that M2M? could promote angiogenesis and improve the degree of skeletal muscle repair,which will guide the research and development of M2M? implantation to improve skeletal muscle regeneration.

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：