Dr. Sreeram Dhurjaty Profile

Dr. Sreeram Dhurjaty

Retired at Dhurjaty Electronics Consulting LLC

SPIE Involvement:

Author

Publications (10)

Proceedings Article | 9 March 2018 Paper

Developing a unique portable device to non-invasively detect bio-electrochemical characteristics of human tissues

Ali Zarafshani, Sreeram Dhurjaty, Seyedeh-nafiseh Mirniaharikandehei, Faranak Aghaei, Liangzhong Xiang, Bin Zheng

Proceedings Volume 10573, 105735L (2018) https://doi.org/10.1117/12.2293507

KEYWORDS: Breast, Tissues, Breast cancer, Cancer, Electrodes, Bismuth, Calibration, Mammography, Skin, Signal detection

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Proceedings Article | 29 March 2016 Paper

A new paradigm of dielectric relaxation spectroscopy for non-invasive detection of breast abnormalities: a preliminary feasibility analysis

Sreeram Dhurjaty, Yuchen Qiu, Maxine Tan, Wei Qian, Bin Zheng

Proceedings Volume 9783, 97832P (2016) https://doi.org/10.1117/12.2217196

KEYWORDS: Breast, Dielectric relaxation, Spectroscopy, Dielectric spectroscopy, Dielectrics, Mathematical modeling, Cancer, Electrodes, Signal detection, Tissues, Capacitance, Dielectric polarization, Breast cancer

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Proceedings Article | 19 March 2015 Paper

A new application of electrical impedance spectroscopy for measuring glucose metabolism: a phantom study

Sreeram Dhurjaty, Yuchen Qiu, Maxine Tan, Hong Liu, Bin Zheng

Proceedings Volume 9417, 94172K (2015) https://doi.org/10.1117/12.2081599

KEYWORDS: Glucose, Mode conditioning cables, Liquids, Cancer, Tissues, Blood, Dielectric spectroscopy, Capacitance, Signal detection, Positron emission tomography

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Proceedings Article | 19 March 2014 Paper

A new resonance-frequency based electrical impedance spectroscopy and its application in biomedical engineering

Sreeram Dhurjaty, Yuchen Qiu, Maxine Tan, Bin Zheng

Proceedings Volume 9033, 90334G (2014) https://doi.org/10.1117/12.2042392

KEYWORDS: Signal detection, Capacitance, Cancer, Tissues, Calibration, Liquids, Breast, Tumors, Dielectric spectroscopy, Oncology

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Proceedings Article | 6 March 2013 Paper

Resonance-frequency based electrical impedance spectroscopy and its detection sensitivity to breast lesions

Sreeram Dhurjaty, Bin Zheng, David Gur

Proceedings Volume 8668, 86684U (2013) https://doi.org/10.1117/12.2006380

KEYWORDS: Breast, Capacitance, Tissues, Breast cancer, Resistance, Electrodes, Signal detection, Data modeling, Cancer, Dielectric spectroscopy

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Proceedings Article | 24 February 2010 Paper

A support vector machine designed to identify breasts at high risk using multi-probe generated REIS signals: a preliminary assessment

David Gur, Bin Zheng, Dror Lederman, Sreeram Dhurjaty, Jules Sumkin, Margarita Zuley

Proceedings Volume 7627, 76271B (2010) https://doi.org/10.1117/12.844452

KEYWORDS: Breast, Biopsy, Signal detection, Sensors, Tissues, Signal generators, Imaging systems, Nipple, Breast cancer, Skin

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Proceedings Article | 13 March 2009 Paper

Developing and testing a multi-probe resonance electrical impedance spectroscopy system for detecting breast abnormalities

David Gur, Bin Zheng, Sreeram Dhurjaty, Gene Wolfe, Mary Fradin, Richard Weil, Jules Sumkin, Margarita Zuley

Proceedings Volume 7263, 72631F (2009) https://doi.org/10.1117/12.811017

KEYWORDS: Breast, Sensors, Signal detection, Breast cancer, Tissues, Dielectric spectroscopy, Mammography, Biopsy, Cancer, Nipple

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In our previous study, we reported on the development and preliminary testing of a prototype resonance electrical impedance spectroscopy (REIS) system with a pair of probes. Although our pilot study on 150 young women ranging from 30 to 50 years old indicated the feasibility of using REIS output sweep signals to classify between the women who had negative examinations and those who would ultimately be recommended for biopsy, the detection sensitivity was relatively low. To improve performance when using REIS technology, we recently developed a new multi-probe based REIS system. The system consists of a sensor module box that can be easily lifted along a vertical support device to fit women of different height. Two user selectable breast placement "cups" with different curvatures are included in the system. Seven probes are mounted on each of the cups on opposing sides of the sensor box. By rotating the sensor box, the technologist can select the detection sensor cup that better fits the breast size of the woman being examined. One probe is mounted in the cup center for direct contact with the nipple and the other six probes are uniformly distributed along an outside circle to enable contact with six points on the outer and inner breast skin surfaces. The outer probes are located at a distance of 60mm away from the center (nipple) probe. The system automatically monitors the quality of the contact between the breast surface and each of the seven probes and data acquisition can only be initiated when adequate contact is confirmed. The measurement time for each breast is approximately 15 seconds during which time the system records 121 REIS signal sweep outputs generated from 200 KHz to 800 KHz at 5 KHz increments for all preselected probe pairs. Currently we are measuring 6 pairs between the center probe and each of six probes located on the outer circle as well as two pairs between probe pairs on the outer circle. This new REIS system has been installed in our clinical breast imaging facility. We are conducting a prospective study to assess performance when using this REIS system under an approved IRB protocol. Over 200 examinations have been conducted to date. Our experience showed that this new REIS system was easy to operate and the REIS examination was fast and considered "comfortable" by examinees since the women presses her breast into the cup herself without any need for forced breast compression, and all but a few highly sensitive women have any sensation of an electrical current during the measurement.

Proceedings Article | 20 April 2005 Paper

The effect of finite gain in charge amplifiers in digital radiography

Sreeram Dhurjaty

Proceedings Volume 5745, (2005) https://doi.org/10.1117/12.596018

KEYWORDS: Amplifiers, Capacitors, Capacitance, Radiography, Signal to noise ratio, Optical amplifiers, Calibration, Temperature metrology, Medical imaging, Silicon

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