背景与目的:计算机体层成像(computed tomography,CT)检查已成为有效剂量的主要来源之一。本研究通过分析甲状腺CT的辐射剂量、图像质量和女性体成分之间的相关性,为今后更好地控制辐射剂量和图像质量提供数据基础。方法:回顾性分析2015...背景与目的:计算机体层成像(computed tomography,CT)检查已成为有效剂量的主要来源之一。本研究通过分析甲状腺CT的辐射剂量、图像质量和女性体成分之间的相关性,为今后更好地控制辐射剂量和图像质量提供数据基础。方法:回顾性分析2015年1月—2019年12月在复旦大学附属肿瘤医院进行甲状腺CT检查的患者。收集甲状腺实质均匀区域的CT值和标准差值,相同感兴趣区(region of interest,ROI)大小测量邻近皮下脂肪组织的CT值和标准差值。所有数据需测3次取其均值,记录容积CT剂量指数(CT dose index of volume,CTDIvol)、剂量长度乘积(dose length product,DLP)并计算有效剂量值和各部位的信噪比(signal-to-noise ratio,SNR)、对比噪声比(contrast-tonoise ratio,CNR)。所有患者均接受骨密度检查,记录患者的身高、体重、体重指数(body mass index,BMI)、体表面积(body surface area,BSA)、脊柱与大腿肌肉百分比、脊柱与大腿脂肪百分比的数值。结果:104例患者纳入本研究。甲状腺CT图像的SNR和脊柱肌肉百分比(r=0.284,P=0.004)、CNR和脊柱脂肪百分比(r=0.197,P=0.045)、甲状腺CT图像的有效剂量和患者的年龄、体重、BMI、大腿脂肪百分比、BSA之间(r=0.221、0.247、0.260、0.262和0.222,P=0.024、0.011、0.008、0.007和0.024)均呈正相关。SNR和年龄、体重、BMI及脊柱脂肪百分比(r=-0.292、-0.198、-0.207、-0.284;P=0.003、0.044、0.035和0.004),CNR和脊柱肌肉百分比(r=-0.197,P=0.045),有效剂量和大腿肌肉百分比(r=-0.262,P=0.007)之间均呈负相关。结论:甲状腺CT的辐射剂量与女性体成分有相关性,图像质量与女性体成分的相关关系为今后更好地控制辐射剂量和提高图像质量提供了数据基础。展开更多
Objective: to study the treatment method and application effect of emergency internal medicine for elderly patients with severe heart failure. Methods: the study was conducted from June 2020 to March 2021. The patient...Objective: to study the treatment method and application effect of emergency internal medicine for elderly patients with severe heart failure. Methods: the study was conducted from June 2020 to March 2021. The patients were mainly elderly patients with severe heart failure. A total of 86 patients were divided into the control group and the study group, respectively. The former received routine treatment, while the latter received metoprolol and irbesartan and hydrochlorothiazide simultaneously. After treatment, the effects of the two models were compared and evaluated from the aspects of cardiac function index, quality of life and treatment efficiency. Results: before treatment, the cardiac function and quality of life of the patients were evaluated. The difference between the average values of the patients in each group was small (P > 0.05). The difference in data was not statistically significant. After treatment, the relevant indexes were evaluated again. The effective rate of the control group was 83.72%, LIHFe score was (26.31±3.84), BNP was (900.57±36.92)ng/ml, LVEF was (38.72±3.73)%, LVEDD was (51.35±4.74)mm and LVESD was (42.49±3.57) mm. However, the above indexes of the research group, they were95.35%、(21.39±3.06)、(259.67±23.73)ng/mL, (44.47±3.29)%, (51.35±4.74)mm、(42.49±3.57)mm respectively. All the indexes in the latter group had advantages, P < 0.05. Conclusion: the combination of metoprolol and irbesartan and hydrochlorothiazide has excellent applicability. It can better help the emergency internal medicine department to complete the treatment of elderly patients with severe heart failure, improve the quality of life, optimize the cardiac function, and has extremely strong promotion and application value.展开更多
A fast and simple method to extract phase-contrast images from interferograms is proposed, and its effectiveness is demonstrated through simulation and experiment. For x-ray differential phase contrast imaging, a stro...A fast and simple method to extract phase-contrast images from interferograms is proposed, and its effectiveness is demonstrated through simulation and experiment. For x-ray differential phase contrast imaging, a strong attenuation signal acts as an overwhelming background intensity that obscures the weak phase signal so that no obvious phase-gradient information is detectable in the raw image. By subtracting one interferogram from another, chosen at particular intervals,the phase signal can be isolated and magnified.展开更多
文摘背景与目的:计算机体层成像(computed tomography,CT)检查已成为有效剂量的主要来源之一。本研究通过分析甲状腺CT的辐射剂量、图像质量和女性体成分之间的相关性,为今后更好地控制辐射剂量和图像质量提供数据基础。方法:回顾性分析2015年1月—2019年12月在复旦大学附属肿瘤医院进行甲状腺CT检查的患者。收集甲状腺实质均匀区域的CT值和标准差值,相同感兴趣区(region of interest,ROI)大小测量邻近皮下脂肪组织的CT值和标准差值。所有数据需测3次取其均值,记录容积CT剂量指数(CT dose index of volume,CTDIvol)、剂量长度乘积(dose length product,DLP)并计算有效剂量值和各部位的信噪比(signal-to-noise ratio,SNR)、对比噪声比(contrast-tonoise ratio,CNR)。所有患者均接受骨密度检查,记录患者的身高、体重、体重指数(body mass index,BMI)、体表面积(body surface area,BSA)、脊柱与大腿肌肉百分比、脊柱与大腿脂肪百分比的数值。结果:104例患者纳入本研究。甲状腺CT图像的SNR和脊柱肌肉百分比(r=0.284,P=0.004)、CNR和脊柱脂肪百分比(r=0.197,P=0.045)、甲状腺CT图像的有效剂量和患者的年龄、体重、BMI、大腿脂肪百分比、BSA之间(r=0.221、0.247、0.260、0.262和0.222,P=0.024、0.011、0.008、0.007和0.024)均呈正相关。SNR和年龄、体重、BMI及脊柱脂肪百分比(r=-0.292、-0.198、-0.207、-0.284;P=0.003、0.044、0.035和0.004),CNR和脊柱肌肉百分比(r=-0.197,P=0.045),有效剂量和大腿肌肉百分比(r=-0.262,P=0.007)之间均呈负相关。结论:甲状腺CT的辐射剂量与女性体成分有相关性,图像质量与女性体成分的相关关系为今后更好地控制辐射剂量和提高图像质量提供了数据基础。
文摘Objective: to study the treatment method and application effect of emergency internal medicine for elderly patients with severe heart failure. Methods: the study was conducted from June 2020 to March 2021. The patients were mainly elderly patients with severe heart failure. A total of 86 patients were divided into the control group and the study group, respectively. The former received routine treatment, while the latter received metoprolol and irbesartan and hydrochlorothiazide simultaneously. After treatment, the effects of the two models were compared and evaluated from the aspects of cardiac function index, quality of life and treatment efficiency. Results: before treatment, the cardiac function and quality of life of the patients were evaluated. The difference between the average values of the patients in each group was small (P > 0.05). The difference in data was not statistically significant. After treatment, the relevant indexes were evaluated again. The effective rate of the control group was 83.72%, LIHFe score was (26.31±3.84), BNP was (900.57±36.92)ng/ml, LVEF was (38.72±3.73)%, LVEDD was (51.35±4.74)mm and LVESD was (42.49±3.57) mm. However, the above indexes of the research group, they were95.35%、(21.39±3.06)、(259.67±23.73)ng/mL, (44.47±3.29)%, (51.35±4.74)mm、(42.49±3.57)mm respectively. All the indexes in the latter group had advantages, P < 0.05. Conclusion: the combination of metoprolol and irbesartan and hydrochlorothiazide has excellent applicability. It can better help the emergency internal medicine department to complete the treatment of elderly patients with severe heart failure, improve the quality of life, optimize the cardiac function, and has extremely strong promotion and application value.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.61101175,61571305,and 61227802)
文摘A fast and simple method to extract phase-contrast images from interferograms is proposed, and its effectiveness is demonstrated through simulation and experiment. For x-ray differential phase contrast imaging, a strong attenuation signal acts as an overwhelming background intensity that obscures the weak phase signal so that no obvious phase-gradient information is detectable in the raw image. By subtracting one interferogram from another, chosen at particular intervals,the phase signal can be isolated and magnified.
