An electrical impedance tomography system for gynecological application GIT with a tiny electrode array

Черепенин, В. А.; Gulyaev, Yuri V.; Korjenevsky, A V; Sapetsky, S A; Tuykin, T. S.

doi:10.1088/0967-3334/33/5/849

Cited by 16 publications

(4 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It has been considered in a number of medical [1] and industrial applications [2]. Medical applications include ventilation and perfusion imaging [3], brain imaging [4], and cancer detection applied to breast [5], prostate [6], and cervical [7] tissues. It is attractive for medical applications due to its affordability, safe non-ionizing radiation-based nature [1], and potential for portability and miniaturization [8].…”

Section: Introductionmentioning

confidence: 99%

Absolute Reconstructions Using Rotational Electrical Impedance Tomography for Breast Cancer Imaging

Murphy

Mahara

Halter

2017

IEEE Trans. Med. Imaging

View full text Add to dashboard Cite

A rotational Electrical Impedance Tomography (rEIT) methodology is described and shown to produce spatially accurate absolute reconstructions with improved image contrast and an improved ability to distinguish closely spaced inclusions compared to traditional EIT on data recorded from cylindrical and breast-shaped tanks. Rotations of the tank without altering the interior conductivity distribution are used to produce the rEIT data. Quantitatively, rEIT was able to distinguish two inclusions that were 1.5 cm closer together than traditional EIT could achieve for inclusions placed 2 to 3 cm from the center for the cylindrical tank, and rEIT was able to distinguish two tumor-like inclusions where traditional EIT could not reliably do so.Mathematical analysis showed that rEIT improves the number of stable singular vectors by up to 4.2 and 4.7 times than that of traditional EIT for the cylindrical and breast-shaped tanks, respectively, which is an indication of improved resolution. Direct investigations into measurements revealed minimum rotation angles that should yield data uncorrupted by noise. Two inverse approaches (one that inverts then fuses the data (I/DF) and one that fuses the data then inverts (DF/I)) and two mesh modeling approaches were considered. It was found that DF/I produces far better results compared to I/DF and a rotated-mesh approach produces further improvements. The ability to obtain improved absolute reconstructions using rEIT on a practical clinical scenario (breast-shaped tank experiment) is an important step towards using rEIT to improve previous EIT results in medical applications.

show abstract

Section: Introductionmentioning

confidence: 99%

Absolute Reconstructions Using Rotational Electrical Impedance Tomography for Breast Cancer Imaging

Murphy

Mahara

Halter

2017

IEEE Trans. Med. Imaging

View full text Add to dashboard Cite

show abstract

“…2). A second device recently reported for use in gynecological applications consists of a 48-electrode 30-mm diameter probe that the authors propose to introduce through the vaginal canal [37]. They showed images of 6-mm diameter inclusions in phantom studies.…”

Section: Discussionmentioning

confidence: 99%

Toward Microendoscopic Electrical Impedance Tomography for Intraoperative Surgical Margin Assessment

Halter

Kim

2014

IEEE Trans. Biomed. Eng.

View full text Add to dashboard Cite

No clinical protocols are routinely used to intraoperatively assess surgical margin status during prostate surgery. Instead, margins are evaluated through pathological assessment of the prostate following radical prostatectomy, when it is too late to provide additional surgical intervention. An intraoperative device potentially capable of assessing surgical margin status based on the electrical property contrast between benign and malignant prostate tissue has been developed. Specifically, a microendoscopic electrical impedance tomography (EIT) probe has been constructed to sense and image, at near millimeter resolution, the conductivity contrast within heterogeneous biological tissues with the goal of providing surgeons with real-time assessment of margin pathologies. This device consists of a ring of eight 0.6-mm diameter electrodes embedded in a 5-mm diameter probe tip to enable access through a 12-mm laparoscopic port. Experiments were performed to evaluate the volume of tissue sensed by the probe. The probe was also tested with inclusions in gelatin, as well as on a sample of porcine tissue with clearly defined regions of adipose and muscle. The probe's area of sensitivity consists of a circular area of 9.1 mm2 and the maximum depth of sensitivity is approximately 1.5 mm. The probe is able to distinguish between high contrast muscle and adipose tissue on a sub-mm scale (~500 μm). These preliminary results suggest that EIT is possible in a probe designed to fit within a 12-mm laparoscopic access port.

show abstract

“…The simulation results demonstrated the feasibility of imaging moderately contrasting inclusions at distances of three times the probe radius from the probe surface. Cherepenin et al [13] developed a 48-electrodes OEIT system combined with a vaginal probe for early detection of cervical neoplasia. They checked their system on a saline solution tank containing different small objects.…”

Section: Introductionmentioning

confidence: 99%

Focusing Sensor Design for Open Electrical Impedance Tomography Based on Shape Conformal Transformation

Wang

Ren

Dong

2019

Sensors

View full text Add to dashboard Cite

Electrical Impedance Tomography (EIT) is a non-invasive detection method to image the conductivity changes inside an observation region by using the electrical measurements at the boundary of this region. In some applications of EIT, the observation domain is infinite and is only accessible from one side, which leads to the so-called open EIT (OEIT) problem. Compared with conventional EIT problems, the observation region in OEIT can only be measured from limited projection directions, which makes high resolution imaging much more challenging. To improve the imaging quality of OEIT, a focusing sensor design strategy is proposed based on shape conformal theory. The conformal bijection is used to map a standard EIT sensor defined at a unit circle to a focusing OEIT sensor defined at an upper half plane. A series of numerical and experimental testes are conducted. Compared with the traditional sensor structure, the proposed focusing sensor has higher spatial resolution at the near-electrode region and is good at distinguishing multi-inclusions which are close to each other.

show abstract

An electrical impedance tomography system for gynecological application GIT with a tiny electrode array

Cited by 16 publications

References 10 publications

Absolute Reconstructions Using Rotational Electrical Impedance Tomography for Breast Cancer Imaging

Absolute Reconstructions Using Rotational Electrical Impedance Tomography for Breast Cancer Imaging

Toward Microendoscopic Electrical Impedance Tomography for Intraoperative Surgical Margin Assessment

Focusing Sensor Design for Open Electrical Impedance Tomography Based on Shape Conformal Transformation

Contact Info

Product

Resources

About