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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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公开(公告)号:US5284142A
公开(公告)日:1994-02-08
申请号:US808795
申请日:1991-12-16
申请人: John C. Goble , David Isaacson , Margaret Cheney
发明人: John C. Goble , David Isaacson , Margaret Cheney
CPC分类号: G01R27/26 , A61B5/0536 , G06F19/3437
摘要: A method of practicing electrical impedance tomography produces three-dimensional images of a body. First, one applies certain special current patterns to the body through an array of electrodes attached to the surface. For each current pattern, one measures the voltage at each electrode, thus obtaining a corresponding pattern of voltages. These data are then used in a certain special reconstruction process, which enables a full three-dimensional reconstruction to be done in a short time. The result is a display of an approximation to the electric conductivity and/or electric permittivity in the interior of the body.
摘要翻译: 实施电阻抗层析成像的方法产生身体的三维图像。 首先,通过附着在表面上的电极阵列,将一些特殊的电流图案应用于身体。 对于每个电流模式,一个测量每个电极处的电压,从而获得相应的电压模式。 然后将这些数据用于特定的重建过程,这使得能够在短时间内进行完整的三维重建。 结果是对身体内部的电导率和/或电介质的近似显示。
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