A Dynamic Bladder Volume Measurement Method Insensitive to Urine Conductivity

Abstract

The invention discloses a dynamic bladder volume measurement method insensitive to urine conductivity, and relates to application of an electrical impedance tomography technology in the field of bladder urine volume monitoring. The method comprises the steps: firstly, before measurement, calling an EIDORS function through MATLAB to conduct finite element analogue simulation on the abdomen of a human body; arranging n electrodes on the surface of the whole body of the human body at a position which is h away from the bottom surface of the bladder from the upper side, and constructing a reconstructed image; extracting an edge effect characteristic value by utilizing coordinates and pixel values of pixel points of the bladder region in the reconstructed image; establishing a fitting equationof the edge effect characteristic value and the bladder volume; solving an undetermined fitting coefficient in the fitting equation; finally, for an actual patient, taking the bladder emptying time ofthe patient as a reference frame, and reconstructing an image relative to the reference frame at the current moment by using a time difference method; and extracting an edge effect characteristic value of the patient by using the reconstructed image, and substituting the characteristic value into the fitting equation for mapping to obtain the bladder volume of the patient. According to the method, the influence caused by the urine conductivity is reduced.

Description

technical field [0001] The invention relates to the application of electrical impedance tomography (EIT) in the field of bladder urine volume monitoring, in particular to a dynamic bladder volume measurement method insensitive to urine conductivity. Background technique [0002] Currently, common bladder volume measurement methods include computed tomography (CT) and ultrasound. CT has high precision, but its high radiation, complicated operation, and high price limit its application in daily bladder volume detection. Ultrasound-contrast computed tomography is relatively simple, harmless and reproducible, but its use is still limited to hospitals and professionals. In addition, these two methods are static measurements, which cannot monitor the bladder volume in real time. [0003] Compared with traditional bladder volume measurement methods, Electrical Impedance Tomography (EIT) method has the advantages of real-time, non-invasive, safe and radiation-free, and low cost, a...

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Problems solved by technology

[0005] However, the measurement of bladder volume by global impedance method, neural network method and singular value difference method is easily affected by changes in urine conductivity; the equivalent circle diameter method is not sensitive to changes in urine conductivity, but its measurement accuracy is poor

The conductivity of human urine is affected by factors such as living habits and diet structure, and it varies between different individuals and even at different times in the same individual; due to the above reasons, the accuracy of the EIT method for measuring bladder volume is limited.

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