检索结果-南通市图书馆

magnetic resonance imaging-radiomics evaluation of response to chemotherapy for synchronous liver metastasis of colorectal cancer

引用

World Journal of Gastroenterology 2021年第38期27卷 6465-6475页

作者： Yan-Qing Ma Yang Wen Hong Liang Jian-Guo Zhong Pei-Pei Pang Department of Radiology Zhejiang Provincial People’s HospitalAffiliated People’s Hospital of Hangzhou Medical CollegeHangzhou 310000Zhejiang ProvinceChina Department of Radiology Hangzhou Medical CollegeHangzhou 310000Zhejiang ProvinceChina Department of Pharmaceuticals Diagnosis GE HealthcareHangzhou 310000Zhejiang ProvinceChina

BACKGROUND Synchronous liver metastasis(SLM)is an indicator of poor prognosis for colorectal cancer(CRC).Nearly 50%of CRC patients develop hepatic metastasis,with 15%-25%of them presenting with *** evaluation of SLM in CRC is crucial for precise and personalized *** is beneficial to detect its response to chemotherapy and choose an optimal treatment *** To construct prediction models based on magnetic resonance imaging(MRI)-radiomics and clinical parameters to evaluate the chemotherapy response in SLM of *** A total of 102 CRC patients with 223 SLM lesions were identified and divided into disease response(DR)and disease non-response(non-DR)to *** standardizing the MRI images,the volume of interest was delineated and radiomics features were *** MRI-radiomics logistic model was constructed after methods of variance/Mann-Whitney U test,correlation analysis,and least absolute shrinkage and selection operator in feature *** radiomics score was *** receiver operating characteristics curves by the DeLong test were analyzed with MedCalc software to compare the validity of all ***,the area under curves(AUCs)of DWI,T2WI,and portal phase of contrast-enhanced sequences radiomics model(Ra-DWI,Ra-T2WI,and Ra-portal phase of contrast-enhanced sequences)were *** radiomicsclinical nomogram was generated by combining radiomics features and clinical characteristics of CA19-9 and clinical N *** The AUCs of the MRI-radiomics model were 0.733 and 0.753 for the training(156 lesions with 68 non-DR and 88 DR)and the validation(67 lesions with 29 non-DR and 38 DR)set,***,the AUCs of the training and the validation set of Ra-DWI were higher than those of Ra-T2WI and Ra-portal phase of contrast-enhanced sequences(training set:0.652 vs 0.628 and 0.633,validation set:0.661 vs 0.575 and 0.543).After chemotherapy,the top four of twelve deltaradiomics features of R

关键词： Radiomics Synchronous liver metastasis Colorectal cancer Chemotherapy magnetic resonance Nomogram

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Spin dynamics of magnetic resonance with parametric modulation in a potassium vapor cell

引用

Chinese Physics B 2017年第3期26卷 285-290页

作者：张锐汪之国彭翔黎文浩李松健郭弘 College of Science and Interdisciplinary Center for Quantum Information National University of Defense Technology Changsha 410073 China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science and Center for Quantum Information Technology Peking University Beijing 100871 China College of Optoelectronic Science and Engineering National University of Defense Technology Changsha 410073 China

A typical magnetic-resonance scheme employs a static bias magnetic field and an orthogonal driving magnetic field oscillating at the Larmor frequency, at which the atomic polarization precesses around the static magnetic field. Here we demonstrate both theoretically and experimentally the variations of the resonance condition and the spin precession dynamics resulting from the parametric modulation of the bias field. We show that the driving magnetic field with the frequency detuned by different harmonics of the parametric modulation frequency can lead to resonance as well. Also, a series of frequency sidebands centered at the driving frequency and spaced by the parametric modulation frequency can be observed in the precession of the atomic polarization. We further show that the resonant amplitudes of the sidebands can be controlled by varying the ratio between the amplitude and the frequency of the parametric modulation. These effects could be used in different atomic magnetometry applications.

关键词： atomic magnetometer magnetic resonance parametric modulation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Combined effect of light intensity and temperature on the magnetic resonance linewidth in alkali vapor cell with buffer gas

引用

Chinese Physics B 2017年第6期26卷 417-421页

作者：高阳董海峰王翔王笑菲尹凌霄 School of Instrumentation Science and Opto-Electronics Engineering Beihang University Beijing 100191 China School of Electronic and Information Engineering Beihang University Beijing 100191 China

One of the peculiar phenomenons in non-zero magnetic resonance magnetometer is that, with the increase of the temperature, the magnetic resonance linewidth is narrowed at first instead of broadened due to the increasing collision rate. The magnetometer usually operates at the narrowest linewidth temperature to obtain the best sensitivity. Here, we explain this phenomenon quantitatively considering the nonlinear of the optical pumping in the cell and did experiments to verify this explanation. The magnetic resonance linewidth is measured using one amplitude-modulated pump laser and one continuous probe laser. The field is along the direction orthogonal to the plane of pump and probe beams. We change the temperature from 53℃ to 93℃ and the pumping light from 0.1 mW to 2 mW. The experimental results agree well with the theoretical calculations.

关键词： atomic magnetometer magnetic resonance linewidth temperature

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Prediction of peritoneal free cancer cells in gastric cancer patients by golden-angle radial sampling dynamic contrast-enhanced magnetic resonance imaging

引用

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2024年第7期25卷 617-627页

作者： Xueqing YIN Xinzhong RUAN Yongmeng ZHU Yongfang YIN Rui HUANG Chao LIANG The First Affiliated Hospital of Ningbo University Ningbo 315000China Ningbo Medical Center Lihuili Hospital Ningbo 315000China

Objectiveperitoneal free cancer cells can negatively impact disease progression and patient outcomes in gastric cancer. This study aimed to investigate the feasibility of using golden-angle radial sampling dynamic contrast-enhanced magnetic resonance imaging (GRASP DCE-MRI) to predict the presence of peritoneal free cancer cells in gastric cancer *** enrolled patients were consecutively divided into analysis and validation groups. Preoperative magnetic resonance imaging (MRI) scans and perfusion were performed in patients with gastric cancer undergoing surgery, and peritoneal lavage specimens were collected for examination. Based on the peritoneal lavage cytology (PLC) results, patients were divided into negative and positive lavage fluid groups. The data collected included clinical and MR information. A nomogram prediction model was constructed to predict the positive rate of peritoneal lavage fluid, and the validity of the model was verified based on data from the verification *** was no statistical difference between the proportion of PLC-positive cases predicted by GRASP DCE-MR and the actual PLC test. MR tumor stage, tumor thickness, and perfusion parameter Tofts-Ketty model volume transfer constant (Ktrans) were independent predictors of positive peritoneal lavage fluid. The nomogram model featured a concordance index (C-index) of 0.785 and 0.742 for the modeling and validation groups, *** DCE-MR could effectively predict peritoneal free cancer cells in gastric cancer patients. The nomogram model constructed using these predictors may help clinicians to better predict the risk of peritoneal free cancer cells being present in gastric cancer patients.

关键词： Gastric cancer magnetic resonance Golden-angle radial sampling Nomogram model Peritoneal free cancer cells

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Correlation of magnetic resonance imaging quantitative parameters and apparent diffusion coefficient value with pathological breast cancer

引用

World Journal of Clinical Cases 2022年第21期10卷 7333-7340页

作者： Zhe Wang Guan-Ying Ren Qian Yin Qian Wang Department of Medical Imaging The No.2 Hospital of BaodingBaoding 071051Hebei ProvinceChina Department of Medical Oncology Affiliated Hospital of Hebei UniversityHebei Key Laboratory of Cancer Radiotherapy and ChemotherapyBaoding 071000Hebei ProvinceChina

BACKGROUND China ranks 120th worldwide for the incidence of breast cancer and 163rd for *** screening,diagnosis,and timely determination of the optimal treatment plan can help ensure clinical efficacy and *** To investigate the relationship between quantitative magnetic resonance imaging parameters,apparent diffusion coefficient value,pathological immunohistochemical status,and patient *** A total of 108 patients with breast cancer(breast cancer group)and 110 patients with benign breast tumors(benign group)confirmed by pathological examination at our Hospital from September 2013 to August 2016 were *** patients had undergone preoperative magnetic resonance imaging(MRI)examinations,and the quantitative parameters of MRI and apparent diffusion coefficient(ADC)values for the two groups were *** MRI quantitative parameters and ADC values of patients with different estrogen receptor(ER),progesterone receptor,and human epidermal growth factor receptor-2 expression were statistically *** relationship between the quantitative parameters of MRI and ADC values and patient recurrence was analyzed using receiver operating *** The measured values of the quantitative parameters of MRI-Ktrans,Kep,and Ve in the breast cancer group were higher than those in the benign group;the ADC value in the breast cancer group was lower than that in the benign group,and the difference was statistically significant(P<0.05).The Ktrans,Ve,and ADC values in patients with ER-positive breast cancer were significantly lower than those in patients with negative ER expression(P<0.05).After 5 years of follow-up,22 patients with breast cancer experienced postoperative *** Kep,Ve,and ADC values of the recurrence group were significantly lower than those of the non-recurrence group,and the difference was statistically significant(P<0.05).CONCLUSION MRI quantitative parameters and ADC are related to the expression of breast c

关键词： magnetic resonance Apparent diffusion coefficient Breast cancer Immunohistochemistry Prognosis

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Efficacy of digital breast tomosynthesis combined with magnetic resonance imaging in the diagnosis of early breast cancer

引用

World Journal of Clinical Cases 2022年第28期10卷 10042-10052页

作者： Yun Ren Jiao Zhang Jin-Dan Zhang Jian-Zhong Xu Department of Breast Surgery Changzhi People's Hospital Affiliated to Shanxi Medical UniversityChangzhi 046000Shanxi ProvinceChina Department of Diagnostic Radiology Changzhi People's Hospital Affiliated to Shanxi Medical UniversityChangzhi 046000Shanxi ProvinceChina

BACKGROUND The incidence and mortality rate of breast cancer in China rank 120th and 163rd,worldwide,*** incidence of breast cancer is on the rise;the risk increases with age but is slightly reduced after *** screening,diagnosis,and timely determination of the best treatment plan can ensure clinical efficacy and *** To evaluate the clinical value of magnetic resonance imaging(MRI) combined with digital breast tomosynthesis(DBT) in diagnosing early breast cancer and the effect of breast-conserving surgery by arc *** This study was divided into two ***,110 patients with early breast cancer confirmed by pathological examination and 110 with benign breast diseases diagnosed simultaneously in Changzhi People’s Hospital of Shanxi Province and Shanxi Dayi Hospital from May 2019 to September 2020 were included in the breast cancer group and the benign group,*** groups underwent DBT and MRI examination,and the pathological results were used as the gold standard to evaluate the effectiveness of the combined application of DBT and MRI in the diagnosis of early breast ***,according to the operation method,110 patients with breast cancer were divided into either a breast-conserving group(69 patients) or a modified radical mastectomy group(41 patients).The surgical effect,cosmetic effect,and quality of life of the two groups were *** Among the 110 cases of breast cancer,66 were of invasive ductal carcinoma(60.00%),and 22 were of ductal carcinoma in situ(20.00%).Among the 110 cases of benign breast tumors,55 were of breast fibromas(50.00%),and 27 were of breast adenosis(24.55%).The sensitivity,specificity,and area under the curve(AUC) of DBT in the differential diagnosis of benign and malignant breast tumors were 73.64%,84.55%,and 0.791,*** sensitivity,specificity,and AUC of MRI in the differential diagnosis of benign and malignant breast tumors were 84.55%,85.45%,and 0.85

关键词： Breast cancer magnetic resonance Digital mammography Clinical value Arc incision Breastconserving surgery Digital breast tomosynthesis

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Complete spontaneous regression of giant focal nodular hyperplasia of the liver: magnetic resonance imaging evaluation with hepatobiliary contrast media

引用

World Journal of Gastroenterology 2016年第47期22卷 10461-10464页

作者： Giuseppe Mamone Settimo Caruso Kelvin Cortis Roberto Miraglia Department of Diagnostic and Therapeutic Services IRCCS ISMETT (Mediterranean Institute for Transplantation and Advanced Specialized Therapies) Medical Imaging Department Mater Dei Hospital

Focal nodular hyperplasia(FNH) of the liver is a benign lesion occurring in 0.6%-3% of the general population that probably reflects a local hyperplastic response of hepatocytes to a vascular abnormality. Most lesions are diagnosed incidentally and the natural history of the disease remains largely unknown. It has been shown that most FNH remain stable, or even regress, over a long follow-up period. We present a patient with FNH of the liver who was followed up for 7 years. A 26-yearold woman with a 5-year history of oral contraceptive use was referred to our hospital in February 2005 for further examination of a liver tumour. The diagnosis of FNH was made using magnetic resonance(MR) imaging with hepatospecific contrast media; this technique allows a correct diagnosis, in particular distinguishing FNH from hepatic adenoma, avoiding an invasive procedure such as the lesion biopsy. After 7-year from the diagnosis, we observed the complete spontaneous regression of the lesion by enhanced MR scanning. In this patient, discontinuation of oral contraceptive use and two childbirths may have influenced the natural history of FNH. To our knowledge, in the English literature there is no report illustrating a complete regression of giant FNH but only studies of decreasing in size. The present case suggests that a young patient with giant FNH should be managed conservatively rather than by resection, because FNH has the potential for spontaneous regression.

关键词： Focal nodular hyperplasia Regression magnetic resonance Oral contraceptives Pregnancy

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

magnetic resonance diffusion tensor imaging following major ozonated autohemotherapy for treatment of acute cerebral infarction

引用

Neural Regeneration Research 2016年第7期11卷 1115-1121页

作者： Xiao-na Wu Tao Zhang Jun Wang Xiao-yan Liu Zhen-sheng Li Wei Xiang Wei-qing Du Hong-jun Yang Tie-gen Xiong Wen-ting Deng Kai-run Peng Su-yue Pan Department of Neurology Nanfang Hospital of Southern Medical University Department of Orthopedics Guangzhou General Hospital of Guangzhou Military Command Department of MRI Guangzhou General Hospital of Guangzhou Military Command Department of Neurology Guangzhou General Hospital of Guangzhou Military Command

Major ozonated autohemotherapy has been shown to promote recovery of upper limb motor function in patients with acute cerebral infarction, but whether naajor ozonated autohelnotherapy affects remote in）ury remains poorly understood. Here, we assumed that major ozonated autohemotherapy contributes to recovery of clinical function, possibly by reducing remote injury after acute cerebral infarction. Sixty acute cerebral infarction patients aged 30-80 years were equally and randomly allocated to ozone treatment and control groups. Patients in the ozone treatment group received medical treatment and major ozonated autohemotherapy （47 mg/L, 100 mL ozone） for 10 ± 2 days. Patients in the control group received medical treatment only. National Institutes of Health Stroke Scale score, modified Rankin scale score, and reduced degree of fractional anisotropy values of brain magnetic resonance diffusion tensor imaging were remarkably decreased, brain function improved, clinical efficiency significantly increased, and no obvious adverse reactions detected in the ozone treatment group compared with the control group. These findings suggest that major ozonated autohemotherapy promotes recovery of neurological function in acute cerebral infarction patients by reducing re,note injury, and additionally, exhibits high safety.

关键词： nerve regeneration ozone cerebral infarction magnetic resonance diffusion tensor imaging anisotropy internal capsule whitematter corticospinal tract cerebral peduncle neural regeneration

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

magnetic resonance evaluation of human mesenchymal stem cells in corpus cavernosa of rats and rabbits

引用

Asian Journal of Andrology 2007年第3期9卷 361-367页

作者： Yun-Seob Song Ja-Hyeon Ku Eun-Seop Song Jung-Hoon Kim Jin-Suck Jeon Kong-Hee Lee Sook-Ja Kim Hee-Jeong Cheong Ik-Sung Lim Dongho Choi Jong-Ho Won Department of Urology Stem Cell therapy Center Soonchunhyang School of Medicine Seoul 140-743 Korea Department of Urology Seoul National University Hospital Seoul 110-744 Korea Department of Obstetrics and Gynecology Inha University School of Medicine Incheon 400-103 Korea Department of Radiology Soonchunhyang School of Medicine Seoul 140-743 Korea Department of Internal Medicine Soonchunhyang School of Medicine Seoul 140-743 Korea Department of Urology Soonchunhyang School of Medicine Seoul 140-743 Korea Stem Cell therapy Center Soonchunhyang School of Medicine Seoul 140-743 Korea Department of Industrial Management ＆ Engineering Namseoul University College of Engineering Cheonan 330-707 Korea Department of Surgery Stem Cell therapy Center Soonchunhyang School of Medicine Seoul 140-743 Korea Department of Internal Medicine Stem Cell therapy Center Soonchunhyang School of Medicine Seoul 140-743 Korea

Aim： To investigate whether the biological process of superparamagnetic iron oxide （SPIO）-labeled human mesenchymal stem cells （hMSCs） may be monitored non-invasively by using in vivo magnetic resonance （MR） imaging with conventional 1.5-T system examinations in corpus cavernosa of rats and rabbits. Methods： The labeling efficiency and viability of SP10-labeled hMSCs were examined with Prussian blue and Tripan blue, respectively. After SPIO-labeled hMSCs were transplanted to the corpus cavernosa of rats and rabbits, serial T2-weighted MR images were taken and histological examinations were carried out over a 4-week period. Results： hMSCs loaded with SPIO compared to unlabeled cells had a similar viability. For SPIO-labeled hMSCs more than lx 105 concentration in vitro, MR images showed a decrease in signal intensity. MR signal intensity at the areas of SPIO-labeled hMSCs in the rat and rabbit corpus cavernosa decreased and was confined locally. After injection of SPIO-labeled hMSCs into the corpus cavernosum, MR imaging demonstrated that hMSCs could be seen for at least 12 weeks after injection. The presence of iron was confirmed with Prussian blue staining in histological sections. Conclusion： SP10-labeled hMSCs in corpus cavernosa of rats and rabbits can be evaluated non-invasively by molecular MR imaging. Our findings suggest that MR imaging has the ability to test the long-term therapeutic potential of hMSCs in animals in the setting of erectile dysfunction.

关键词： human mesenchymal stem cells magnetic resonance stem cells penis cell labeling corpus cavemosa

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

magnetic resonance diffusion tensor imaging-based evaluation of optic-radiation shape and position in meningioma

引用

Neural Regeneration Research 2012年第9期7卷 686-691页

作者： Xueming Lv Xiaolei Chen Bainan Xu Jiashu Zhang Gang Zheng Jinjiang Li Fangye Li Guochen Sun Department of Neurosurgery Chinese PLA General Hospital Chinese PLA Postgraduate Medical SchoolBeijing 100853China

Employing magnetic resonance diffusion tensor imaging, three-dimensional white-matter imaging and conventional magnetic resonance imaging can demonstrate the tumor parenchyma, peritumoral edema and compression on surrounding brain tissue. A color-coded tensor map and three-dimensional tracer diagram were applied to clearly display the optic-radiation location, course and damage. Results showed that the altered anisotropy values of meningioma patients corresponded with optic-radiation shape, size and position on both sides. Experimental findings indicate that the magnetic resonance diffusion tensor imaging technique is a means of tracing and clearly visualizing the optic radiation.

关键词： magnetic resonance diffusion tensor imaging diffusion tensor tractography meningioma optic radiation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：