AIM: To assess intravoxel incoherent motion diffusion-weighted imaging (IVIM-DWI) for monitoring early efficacy of chemotherapy in a human gastric cancer mouse model.METHODS: IVIM-DWI was performed with 12 b-values (0...AIM: To assess intravoxel incoherent motion diffusion-weighted imaging (IVIM-DWI) for monitoring early efficacy of chemotherapy in a human gastric cancer mouse model.METHODS: IVIM-DWI was performed with 12 b-values (0-800 s/mm<sup>2</sup>) in 25 human gastric cancer-bearing nude mice at baseline (day 0), and then they were randomly divided into control and 1-, 3-, 5- and 7-d treatment groups (n = 5 per group). The control group underwent longitudinal MRI scans at days 1, 3, 5 and 7, and the treatment groups underwent subsequent MRI scans after a specified 5-fluorouracil/calcium folinate treatment. Together with tumor volumes (TV), the apparent diffusion coefficient (ADC) and IVIM parameters [true water molecular diffusion coefficient (D), perfusion fraction (f) and pseudo-related diffusion coefficient (D<sup>*</sup>)] were measured. The differences in those parameters from baseline to each measurement (ΔTV%, ΔADC%, ΔD%, Δf% and ΔD<sup>*</sup>%) were calculated. After image acquisition, tumor necrosis, microvessel density (MVD) and cellular apoptosis were evaluated by hematoxylin-eosin (HE), CD31 and terminal-deoxynucleotidyl transferase mediated nick end labeling (TUNEL) staining respectively, to confirm the imaging findings. Mann-Whitney test and Spearman’s correlation coefficient analysis were performed.RESULTS: The observed relative volume increase (ΔTV%) in the treatment group were significantly smaller than those in the control group at day 5 (ΔTV<sub>treatment</sub>% = 19.63% ± 3.01% and ΔTV<sub>control</sub>% = 83.60% ± 14.87%, P = 0.008) and day 7 (ΔTV<sub>treatment</sub>% = 29.07% ± 10.01% and ΔTV<sub>control</sub>% = 177.06% ± 63.00%, P = 0.008). The difference in ΔTV% between the treatment and the control groups was not significant at days 1 and 3 after a short duration of treatment. Increases in ADC in the treatment group (ΔADC%<sub>treatment</sub>, median, 30.10% ±展开更多
Objective: To investigate the specificity of the effects of electroacupuncture (EA) at different acupoints on gastric functional activity and gastric blood flow after colorectal distension (CRD) in the rat. Methods: F...Objective: To investigate the specificity of the effects of electroacupuncture (EA) at different acupoints on gastric functional activity and gastric blood flow after colorectal distension (CRD) in the rat. Methods: Fifty Wistar rats were randomly divided into 5 groups: a control group, a Zusanli group, a non-point group, a Taichong group and a Neiguan group. Rats were anesthetized after 18 h of fasting, and a rat model of nociceptive blood pressure elevation and abnormal electrogastrogram (EGG) and gastric tension (GT) was prepared by gasbag-induced CRD. EA was given bilaterally, and its effects on gastric blood flow (GBF) of the arcus vasculosi of the greater omentum, blood pressure, EGG fast wave properties, and gastric smooth muscle tension (GT) were quantified. Results: CRD induced an increase in blood pressure that was significantly inhibited by EA at all points (all P<0.05), and the inhibitory effects were greater in the Zusanli and Neiguan groups compared to the non-point group (both P<0.05). CRD also caused reductions in GT and GBF, and in the amplitude, frequency and duration of EGG waves (all P<0.05). These effects were also reversed by EA. The effects of EA on EGG wave amplitude, GT, and GBF were superior in the Zusanli group compared to the Taichong group, Neiguan group, and the non-point group. Conclusion: EA significantly counteracted CRD-induced changes in blood pressure, GBF, EGG, and GT. The effects of stimulation at Zusanli (ST 36) were significantly greater compared to other points, indicating relative specificity of this acupoint.展开更多
Gastrointestinal tumors(GTs)are among the most com-mon tumors of the digestive system and are among the leading causes of cancer death worldwide.Functional magnetic resonance imaging(MRI)is crucial for assessment of h...Gastrointestinal tumors(GTs)are among the most com-mon tumors of the digestive system and are among the leading causes of cancer death worldwide.Functional magnetic resonance imaging(MRI)is crucial for assessment of histopathological changes and therapeutic responses of GTs before and after chemotherapy and radiotherapy.A new functional MRI technique,intravoxel incoherent motion(IVIM),could reveal more detailed useful information regarding many diseases.Currently,IVIM is widely used for various tumors because the derived parameters(diffusion coefficient,D;pseudo-perfusion diffusion coefficient,D*;and perfusion fraction,f)are thought to be important surrogate imaging biomarkers for gaining insights into tissue physiology.They can simultaneously reflect the microenvironment,microcirculation in the capillary network(perfusion)and diffusion in tumor tissues without contrast agent intra-venous administration.The sensitivity and specificity of these parameters used in the evaluation of GTs vary,the results of IVIM in GTs are discrepant and the variability of IVIM measurements in response to chemotherapy and/or radiotherapy in these studies remains a source of controversy.Therefore,there are questions as to whether IVIM diffusion-weighted MRI is feasible and helpful in the evaluation of GTs,and whether it is worthy of expanded use.展开更多
目的探讨3.0 T MR胃癌患者体素内不相干运动扩散加权成像(intravoxel incoherent motion diffusion weighted imaging,IVIM-DWI)中扫描参数的优化选择。材料与方法前瞻性收集我院自2018年12月至2019年10月经胃镜病理证实的胃癌患者40例...目的探讨3.0 T MR胃癌患者体素内不相干运动扩散加权成像(intravoxel incoherent motion diffusion weighted imaging,IVIM-DWI)中扫描参数的优化选择。材料与方法前瞻性收集我院自2018年12月至2019年10月经胃镜病理证实的胃癌患者40例进行术前MRI检查。采用随机数字表法将患者分为A、B两组,A组采用提高信号平均采集次数(number of signal average,NSA),适当延长重复时间(repetition time,TR)及回波时间(echo time,TE);B组采用降低NSA,适当缩短TR及TE,两组的其余参数一致。A组的扫描时间约为14 min,B组的扫描时间约为7 min 12 s。测量每个患者IVIM-DWI序列(b=1200 t)图像的信噪比(signal to noise ratio,SNR)、对比噪声比(contrast to noise ratio,CNR)以及病灶的ADCslow、ADCfast、f值。通过独立样本t检验比较组间SNR、CNR、ADCslow、ADCfast、f值的差异,并采用双盲法对图像进行主观评价。结果A、B两组的SNR值分别为56.60±34.64、53.50±20.21,CNR值分别为44.95±18.52、41.38±31.72,ADCslow值分别为0.635±0.274、0.818±0.305,ADCfast值分别为6.100±1.075、6.471±1.549,f值分别为0.419±0.184、0.402±0.193,SNR、CNR、ADCslow、ADCfast、f值在A组与B组间的差异均无统计学意义(P>0.05)。A组和B组间图像的主观评分差异有统计学意义(P<0.05)。结论通过降低NSA并适当缩短TR、TE的扫描方案,不仅明显缩短扫描时间,而且图像质量还能满足诊断要求,从而提高胃癌患者接受MR检查的可行性。展开更多
基金Supported by National Research Foundation of South Korea,No.NRF-2013R1A1A2013878 and No.2015R1A2A2A01007827
文摘AIM: To assess intravoxel incoherent motion diffusion-weighted imaging (IVIM-DWI) for monitoring early efficacy of chemotherapy in a human gastric cancer mouse model.METHODS: IVIM-DWI was performed with 12 b-values (0-800 s/mm<sup>2</sup>) in 25 human gastric cancer-bearing nude mice at baseline (day 0), and then they were randomly divided into control and 1-, 3-, 5- and 7-d treatment groups (n = 5 per group). The control group underwent longitudinal MRI scans at days 1, 3, 5 and 7, and the treatment groups underwent subsequent MRI scans after a specified 5-fluorouracil/calcium folinate treatment. Together with tumor volumes (TV), the apparent diffusion coefficient (ADC) and IVIM parameters [true water molecular diffusion coefficient (D), perfusion fraction (f) and pseudo-related diffusion coefficient (D<sup>*</sup>)] were measured. The differences in those parameters from baseline to each measurement (ΔTV%, ΔADC%, ΔD%, Δf% and ΔD<sup>*</sup>%) were calculated. After image acquisition, tumor necrosis, microvessel density (MVD) and cellular apoptosis were evaluated by hematoxylin-eosin (HE), CD31 and terminal-deoxynucleotidyl transferase mediated nick end labeling (TUNEL) staining respectively, to confirm the imaging findings. Mann-Whitney test and Spearman’s correlation coefficient analysis were performed.RESULTS: The observed relative volume increase (ΔTV%) in the treatment group were significantly smaller than those in the control group at day 5 (ΔTV<sub>treatment</sub>% = 19.63% ± 3.01% and ΔTV<sub>control</sub>% = 83.60% ± 14.87%, P = 0.008) and day 7 (ΔTV<sub>treatment</sub>% = 29.07% ± 10.01% and ΔTV<sub>control</sub>% = 177.06% ± 63.00%, P = 0.008). The difference in ΔTV% between the treatment and the control groups was not significant at days 1 and 3 after a short duration of treatment. Increases in ADC in the treatment group (ΔADC%<sub>treatment</sub>, median, 30.10% ±
基金supported by TCM Item of National Key Basic Study (2005CB523306, 2006CB504506 2007CB512505)the National Natural Science Foundation of China (30973796, 90709031)
文摘Objective: To investigate the specificity of the effects of electroacupuncture (EA) at different acupoints on gastric functional activity and gastric blood flow after colorectal distension (CRD) in the rat. Methods: Fifty Wistar rats were randomly divided into 5 groups: a control group, a Zusanli group, a non-point group, a Taichong group and a Neiguan group. Rats were anesthetized after 18 h of fasting, and a rat model of nociceptive blood pressure elevation and abnormal electrogastrogram (EGG) and gastric tension (GT) was prepared by gasbag-induced CRD. EA was given bilaterally, and its effects on gastric blood flow (GBF) of the arcus vasculosi of the greater omentum, blood pressure, EGG fast wave properties, and gastric smooth muscle tension (GT) were quantified. Results: CRD induced an increase in blood pressure that was significantly inhibited by EA at all points (all P<0.05), and the inhibitory effects were greater in the Zusanli and Neiguan groups compared to the non-point group (both P<0.05). CRD also caused reductions in GT and GBF, and in the amplitude, frequency and duration of EGG waves (all P<0.05). These effects were also reversed by EA. The effects of EA on EGG wave amplitude, GT, and GBF were superior in the Zusanli group compared to the Taichong group, Neiguan group, and the non-point group. Conclusion: EA significantly counteracted CRD-induced changes in blood pressure, GBF, EGG, and GT. The effects of stimulation at Zusanli (ST 36) were significantly greater compared to other points, indicating relative specificity of this acupoint.
文摘Gastrointestinal tumors(GTs)are among the most com-mon tumors of the digestive system and are among the leading causes of cancer death worldwide.Functional magnetic resonance imaging(MRI)is crucial for assessment of histopathological changes and therapeutic responses of GTs before and after chemotherapy and radiotherapy.A new functional MRI technique,intravoxel incoherent motion(IVIM),could reveal more detailed useful information regarding many diseases.Currently,IVIM is widely used for various tumors because the derived parameters(diffusion coefficient,D;pseudo-perfusion diffusion coefficient,D*;and perfusion fraction,f)are thought to be important surrogate imaging biomarkers for gaining insights into tissue physiology.They can simultaneously reflect the microenvironment,microcirculation in the capillary network(perfusion)and diffusion in tumor tissues without contrast agent intra-venous administration.The sensitivity and specificity of these parameters used in the evaluation of GTs vary,the results of IVIM in GTs are discrepant and the variability of IVIM measurements in response to chemotherapy and/or radiotherapy in these studies remains a source of controversy.Therefore,there are questions as to whether IVIM diffusion-weighted MRI is feasible and helpful in the evaluation of GTs,and whether it is worthy of expanded use.
文摘目的探讨3.0 T MR胃癌患者体素内不相干运动扩散加权成像(intravoxel incoherent motion diffusion weighted imaging,IVIM-DWI)中扫描参数的优化选择。材料与方法前瞻性收集我院自2018年12月至2019年10月经胃镜病理证实的胃癌患者40例进行术前MRI检查。采用随机数字表法将患者分为A、B两组,A组采用提高信号平均采集次数(number of signal average,NSA),适当延长重复时间(repetition time,TR)及回波时间(echo time,TE);B组采用降低NSA,适当缩短TR及TE,两组的其余参数一致。A组的扫描时间约为14 min,B组的扫描时间约为7 min 12 s。测量每个患者IVIM-DWI序列(b=1200 t)图像的信噪比(signal to noise ratio,SNR)、对比噪声比(contrast to noise ratio,CNR)以及病灶的ADCslow、ADCfast、f值。通过独立样本t检验比较组间SNR、CNR、ADCslow、ADCfast、f值的差异,并采用双盲法对图像进行主观评价。结果A、B两组的SNR值分别为56.60±34.64、53.50±20.21,CNR值分别为44.95±18.52、41.38±31.72,ADCslow值分别为0.635±0.274、0.818±0.305,ADCfast值分别为6.100±1.075、6.471±1.549,f值分别为0.419±0.184、0.402±0.193,SNR、CNR、ADCslow、ADCfast、f值在A组与B组间的差异均无统计学意义(P>0.05)。A组和B组间图像的主观评分差异有统计学意义(P<0.05)。结论通过降低NSA并适当缩短TR、TE的扫描方案,不仅明显缩短扫描时间,而且图像质量还能满足诊断要求,从而提高胃癌患者接受MR检查的可行性。
