Diagnosis of Breast Cancer Using Electrical Impedance Tomography

Пак, Д. Д.; Ni, Rozhkova; Киреева, М. Н.; Ермощенкова, М. В.; Nazarov, Andrey; Фомин, Д. К.; Рубцова, Н. А.

doi:10.1007/s10527-012-9292-7

Cited by 34 publications

(23 citation statements)

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“…. , V L ] T can be calculated by solving the boundary value problem defined by (1) and (2). Due to the limited voltage rejection ratio of electronic circuit, a large common voltage may reduce the measurement sensitivity.…”

Section: Direct Problemmentioning

confidence: 99%

“…One of the commonly seen applications of EIT is to reconstruct the inclusions in a homogeneous background medium, e.g. detecting tumor [1,2], monitoring respiratory process [3,4], imaging air bubbles in liquids [5,6]. With prior knowledge of the conductivity values of the inclusions, the boundary of the inclusions can be parameterized by a set of shape coefficients, then reconstructed from EIT measurements.…”

Section: Introductionmentioning

confidence: 99%

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Inclusion boundary reconstruction and sensitivity analysis in electrical impedance tomography

Ren

Soleimani

et al. 2017

Inverse Problems in Science and Engineering

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Reconstruction of conductive inclusions in a homogeneous background medium is commonly seen in EIT. One of the methods to deal with the inclusion reconstruction problems is the shape-based method. With prior knowledge of conductivity of target inclusions, the boundary of inclusions is parameterized by several shape coefficients and recovered from EIT measurements. This paper presents a shape-based inclusion reconstruction method and its numerical implementation with Boundary Element Method (BEM). A Shape Perturbation Method (SPM) is proposed to calculate the shape sensitivity in EIT. To evaluate the accuracy of the presented method, a series of numerical tests are conducted. The characteristics of EIT shape sensitivity are analyzed. Some factors influencing the reconstruction performance are discussed.

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Section: Direct Problemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Inclusion boundary reconstruction and sensitivity analysis in electrical impedance tomography

Ren

Soleimani

et al. 2017

Inverse Problems in Science and Engineering

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“…Finally, the definition of specificity and sensitivity of the proposed method is planned to be achieved in a validation stage with real breast tissue results obtained through experimental clinical trials. The validation procedure is planned through result comparison with mammography or ultrasound techniques [43][44][45][46][47].…”

mentioning

confidence: 99%

Electrical Impedance-Based Methodology for Locating Carcinoma Emulators on Breast Models

et al. 2019

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There is a worldwide need for new methodologies to prediagnose breast cancer in an early stage, which helps to notably increase the possibility of saving the mammary gland or patient's life. This work describes a new methodology proposal based on electrical impedance for the localization of preclinical carcinoma emulators in agar phantoms of the breast. The impedance is systematically measured through eight Ag/AgCl electrodes uniformly distributed in a ring arrangement placed on the breast agar phantom. The fundamental idea of the proposed location algorithm, named Anomaly Tracking Circle algorithm, is to find the breast agar area defined by straight lines joining the electrode pairs having the minimum difference value of the defined normalized impedance magnitude along the measurement sweep. Such difference is obtained with respect to a breast agar phantom without carcinoma emulator. The proposed methodology was evaluated through seven experimental agar models, six of them having carcinoma lobe emulators with different locations and electrical conductivities. According to the obtained results, the described methodology can obtain the location zone of preclinical-emulated carcinomas with an 83.33% success.

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“…A larger study [26] was conducted consisting of an in vivo trial on 117 female patients. The subjects included healthy patients and patients with mastopathy, benign tumours, or breast cancer.…”

Section: Eit and Breast Cancer Detectionmentioning

confidence: 99%

“…The MEIK electroimpedance mammograph was used in the two studies mentioned above. The device uses a circular array of 256 electrodes to image the conductivity over the breast [26]. The T-SCAN device is another clinically available device [27].…”

Section: Eit and Breast Cancer Detectionmentioning

confidence: 99%

Electrical Impedance Tomography in 3D: Characterization and Evaluation

Wagenaar¹

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Electrical Impedance Tomography (EIT) uses body surface electrical stimulation and measurements to create images of the conductivity contrasting fluids. Identifying and monitoring regions of inhomogeneous behaviour in the lungs can be a vital part of the treatment of lung injuries. Traditionally, EIT uses a placement of electrodes in a 2D ring around the thorax, and thus produces cross-sectional images. 3D EIT has a potential to image regional inhomogeneities with 3D spatial extent and to improve planar resolution over 2D EIT. However, while 3D reconstruction algorithms are available, little evaluation has been done to understand the performance of 3D EIT in terms of the measurement configurations available. This thesis focuses on this evaluation task. It has three main objectives. First, to examine different measurement patterns, and determine the best-suited pattern for in vivo 3D lung imaging of regional inhomogeneities.Second, to capture regional inhomogeneities in the lungs caused by gravitational effects by recording EIT on human subjects in the standing, sitting, supping, and decline postures. This method is used in order to cause and measure regional inhomogeneities in the lungs. Third, to verify the ability of 3D EIT to measure global lung volume changes in volunteers by comparing reconstructed images to spirometry lung volume measurements.To address these objectives, the thesis develops an analysis methodology, and applies it to data from simulation, phantom, and measurements on 8 healthy volunteers. Results indicate that 3D EIT can provide meaningful and stable reading of the global change in lung volume. Functional EIT images are created from inhalation curve features to analyze the effect of posture on regional lung behaviour with the greater lung activity moving upwards in the thorax when moving from the standing postures to a declined posture. The Planar and Zigzag Offset patterns show statistically significant difference in vertical lung activity between the decline and standing postures and the supine and standing postures for several fEIT features. While inconsistent, the positive results indicate that 3D EIT is capable of capturing region lung inhomogeneities in 3D space. Overall, this thesis presents analysis methodologies (simulation, phantom, and experimental) to characterize and optimize 3D EIT imaging.iii

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Diagnosis of Breast Cancer Using Electrical Impedance Tomography

Cited by 34 publications

References 0 publications

Inclusion boundary reconstruction and sensitivity analysis in electrical impedance tomography

Inclusion boundary reconstruction and sensitivity analysis in electrical impedance tomography

Electrical Impedance-Based Methodology for Locating Carcinoma Emulators on Breast Models

Electrical Impedance Tomography in 3D: Characterization and Evaluation

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