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Assuming elliptical symmetry the vena caval crosssection could be reconstructed, and the crosssectional area, perimeter and segmental volume could be calculated throughout the cardiac cycle.


There is an excellent agreement between the integrated flow records and the electricalimpedance changes; this is consistent with the hypothesis that the impedance changes reflect segmental volume changes.


A simple theoretical analysis shows that the calculation of segmental volume from impedance changes requires assumptions as to the manner in which the limb expands.


It predicts observed impedance change as a function of senseelectrode configuration and the increase in segmental volume associated with each blood pulse.


It was concluded that precise impedance measurements were closely related to changes in segmental volume, and that any change in conductivity caused by the incoming arterial blood probably played a minor role.

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 On the basis of the study of the cadavers with the CT DIP method, 50 young male living subjects were undergone investigations through scanning, image analysis and calculation. The data of the segmental length, volume of these living subjects were obtained. Thus, the volume distribution of the Chinese young male bodies were determined and a binary regression equation that could immediately calculate the segmental volume of the Chinese young male bodies were set up, in which the body weight and stature were acted... On the basis of the study of the cadavers with the CT DIP method, 50 young male living subjects were undergone investigations through scanning, image analysis and calculation. The data of the segmental length, volume of these living subjects were obtained. Thus, the volume distribution of the Chinese young male bodies were determined and a binary regression equation that could immediately calculate the segmental volume of the Chinese young male bodies were set up, in which the body weight and stature were acted as independent variable quantity.  采用 ＣＴ－图像分析法，在尸体研究的基础上，对 ５０例中国男性样本（１８— ２３岁）进行了全身ＣＴ横断层扫描、影像分析和测算，获得了样本各环节的长度和体积等惯性数据。进而确定了中国男性青年人体体积的分布，并据此建立了以身高、体重为自变量的直接计算中国青年人体各环节体积的二元回归方程。  On the basis of the study of the cadavers with the CT DIP method in this project, 50 young male living subjects were undergone investigations through scanning, image analysis and calculation. The data of the segmental length, volume of these living subjects were obtained. Thus, the volume distribution of the Chinese young male bodies were determined and a binal regression equation that could immediately calculate the segmental volume of the Chinese young male bodies were set up, in which the body weight and... On the basis of the study of the cadavers with the CT DIP method in this project, 50 young male living subjects were undergone investigations through scanning, image analysis and calculation. The data of the segmental length, volume of these living subjects were obtained. Thus, the volume distribution of the Chinese young male bodies were determined and a binal regression equation that could immediately calculate the segmental volume of the Chinese young male bodies were set up, in which the body weight and stature were acted as independent varable quantity .  采用CT—图像分析法,在尸体研究的基础上,对50例中国男性样本(18～23岁)进行了全身CT横断层扫描、影像分析和测算,获得了样本各环节的长度和体积等惯性数据。进而确定了中国男性青年人体体积的分布,并据此建立了以身高、体重为自变量的直接计算中国青年人体各环节体积的二元回归方程。  Objective: To directly determine the every segmental volume of the Chinese young female bodies. Methods: With the CTDIP method, 50 young female living subjects were investigated through scanning, image analysis and calculation. Results.The data of the segmental volume of these living subjects were obtained. Thus, a binal regression equation that could immediately calculate the segmental volume of the young female bodies were set up, in which the body weight and stature were acted as independent varable quantity.... Objective: To directly determine the every segmental volume of the Chinese young female bodies. Methods: With the CTDIP method, 50 young female living subjects were investigated through scanning, image analysis and calculation. Results.The data of the segmental volume of these living subjects were obtained. Thus, a binal regression equation that could immediately calculate the segmental volume of the young female bodies were set up, in which the body weight and stature were acted as independent varable quantity. Conclusion: A dependable method is provided for the immediatel calculating of the segmental volume in the young Chinese female bodies.  目的:直接测算女性青年人体各环节体积。方法:采用CT图像分析法,对50例女性样本(18～23岁)进行全身CT横断层扫描、影像分析和测算。结果:获得了样本各环节的长度和体积等惯性数据并建立了以身高、体重为自变量的直接计算青年人体各环节体积的二元回归方程。结论:为直接确定女性青年人体的体积分布提供了可靠的手段。  
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