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公开(公告)号：US5381333A
公开(公告)日：1995-01-10
申请号：US734591
申请日：1991-07-23
CPC分类号： G01R27/26 , A61B5/0536 , Y10S128/922
摘要： A method in electrical impedance tomography uses an adaptive repeated series of calculations and measurements to determine the best current pattern for a body having an initially unknown internal conductivity, for producing the best electrical impedance image for the body. Initially, an arbitrary current pattern and conductivity is utilized to generate a voltage pattern which is measured and compared with the theoretical voltage pattern based on the arbitrary conductivity and current patterns. When both the current pattern and the conductivity yielded by the process closely match values derived by measurements, the voltage pattern is used to produce the image.
摘要翻译： 电阻抗层析成像中的一种方法使用自适应重复的一系列计算和测量来确定具有最初未知内部电导率的身体的最佳电流模式，以产生用于身体的最佳电阻抗图像。 最初，利用任意的电流模式和电导率来产生电压模式，该电压模式根据任意的电导率和电流模式与理论电压模式进行测量和比较。 当由该过程产生的电流模式和电导率两者都非常匹配通过测量导出的值时，使用电压模式来产生图像。
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公开(公告)号：US5544662A
公开(公告)日：1996-08-13
申请号：US132457
申请日：1993-10-06
申请人： Gary J. Saulnier , David G. Gisser , Jonathan C. Newell , Raymond D. Cook , John C. Goble , David Isaacson
发明人： Gary J. Saulnier , David G. Gisser , Jonathan C. Newell , Raymond D. Cook , John C. Goble , David Isaacson
CPC分类号： G01R27/26 , A61B5/0536 , G06F19/3406 , G06F19/3412
摘要： An apparatus for electrical impedance imaging of a body includes an array of multiple electrodes. Each is connected to an adjustable amplitude precision current source of fixed frequency and an oversampling type digital voltmeter. The current amplitudes are set to produce a series of spatial current patterns, all orthogonal to each other, and each applied for only a short time interval while voltages are measured. The voltage and current values are used to create real and reactive impedance images of the interior of the body.
摘要翻译： 用于身体的电阻抗成像的装置包括多个电极阵列。 每个都连接到可调幅度精确的固定频率电流源和过采样型数字电压表。 当前幅度被设置为产生一系列彼此正交的空间电流模式，并且每一个都被施加在短时间间隔内，同时测量电压。 电压和电流值用于产生身体内部的实际和无功阻抗图像。
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公开(公告)号：US5272624A
公开(公告)日：1993-12-21
申请号：US591615
申请日：1990-10-02
CPC分类号： A61B5/0536
摘要： In an electrical impedance imaging system that is capable of forming images based on internal resistivity of a body, an array of electrodes is applied to the surface of the body and energized by a plurality of current generators. Each current generator is controlled to produce current patterns containing single fixed magnitudes. The current generators are also controlled to apply current to the respective electrode only when the current generator is at peak current value to minimize transient conditions and maximize the rate at which images can be produced.
摘要翻译： 在能够基于身体的内部电阻率形成图像的电阻抗成像系统中，电极阵列被施加到身体的表面并被多个电流发生器激励。 每个电流发生器被控制以产生包含单个固定幅度的电流模式。 仅当电流发生器处于峰值电流值时，电流发生器也被控制为仅向相应的电极施加电流，以最小化瞬态条件并使图像的产生速率最大化。
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