전기 단층촬영법을 이용한 방광의 크기 추정

Abstract

Dysuria which causes discomfort in daily life, needs to be continuously monitored for current bladder condition in order to diagnose, treat, or nurse patients after surgery. However, current clinical methods for monitoring bladder conditions are expensive, have difficulty in performing continuous monitoring, or are likely to cause complications. EIT is an imaging modality that can monitor the internal state of the human body non-intrusively. In EIT, a small magnitude of electrical current is passed through the electrodes attached on the human body and measures the voltage between electrodes to visualize resistivitiy distribution inside the domain. EIT has many advantages compared to the other tomography techniques; It is not harmful to the human body. It has fast measurement speed so that temporal resolution is excellent and system design cost is low. Therefore, the current bladder condition can be monitored non-invasively and continuously using EIT system. The bladder is intertwined with the surrounding tissues, and is actually affected by the rectum, which is close to the bladder. Therefore, it is necessary to compare and analyze the performance of image reconstruction according to EIT modeling in order to reconstruct the bladder by generating the surrounding tissue. In the EIT method, the electrode number, width, position, and arrangement of electrodes should be considered during modeling. Signal strength of the measured voltage data changes according to the injected current pattern through the electrodes, and affects image reconstruction performance. In this paper, we compare the effect of current injection pattern and location of electrode array on reconstruction performance when EIT is applied to monitor three different sizes of bladder.