Research Topics
| Ryan J HalterSummaryAffiliation: Dartmouth Medical School Country: USA Publications
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Detail Information
Publications
Passive bioelectrical properties for assessing high- and low-grade prostate adenocarcinomaRyan J Halter
Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire 03755, USA
Prostate 71:1759-67. 2011..Because Gleason grading is also based on tissue architecture we explored the hypothesis that the electrical properties might also provide discriminating power between high- and low-Gleason grade cancers...- Electrical properties of prostatic tissues: I. Single frequency admittivity propertiesRyan J Halter
Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire 03755, USA
J Urol 182:1600-7. 2009..We evaluated how well these electrical properties discriminate cancer from noncancer tissues in the prostate... - Electrical properties of prostatic tissues: II. Spectral admittivity propertiesRyan J Halter
Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire 03755, USA
J Urol 182:1608-13. 2009..The frequency dependence of these properties is also a function of tissue morphology. We evaluated the potential of this spectral dependence to provide additional diagnostic information for prostate cancer detection... - The correlation of in vivo and ex vivo tissue dielectric properties to validate electromagnetic breast imaging: initial clinical experienceRyan J Halter
Thayer School of Engineering, Darmouth College, Hanover, NH 03755, USA
Physiol Meas 30:S121-36. 2009..We present these results in addition to a case study demonstrating how discrete point spectroscopy measurements of the tissue can be correlated and used to validate EM imaging studies... - Imaging forearm blood flow with pulse-ox gated electrical impedance tomographyR J Halter
Thayer School of Engineering at Dartmouth College, Hanover, NH 03755, USA
Conf Proc IEEE Eng Med Biol Soc 2008:1192-5. 2008..19 Hz and 1.21 Hz for the plethysmography trace and conductivity trace, respectively. This preliminary data suggests that EIT may be sensitive enough to visualize cardiac-based pulsatility in the peripheral vessels of the forearm... - Genetic and least squares algorithms for estimating spectral EIS parameters of prostatic tissuesRyan J Halter
Thayer School of Engineering, Dartmouth College, Hanover, NH 03755, USA
Physiol Meas 29:S111-23. 2008..01) were observed between CaP and BPH for the spectral parameters Deltarho and f(c); this is especially important since current prostate cancer screening methods do not reliably differentiate between these two tissue types... - Video rate electrical impedance tomography of vascular changes: preclinical developmentRyan Halter
Dartmouth College, Thayer School of Engineering, Hanover, NH 03755, USA
Physiol Meas 29:349-64. 2008..The distinguishability analysis suggests that a system such as the one developed here may provide a means to characterize the hemodynamics associated with blood flow through the peripheral vasculature... - Electrical impedance spectroscopy of benign and malignant prostatic tissuesRyan J Halter
Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire 03755, USA
J Urol 179:1580-6. 2008..We used electrical impedance spectroscopy to evaluate how significantly the electrical properties of benign and malignant prostatic tissues differ with the goal of providing clinicians with a new biomarker to aid in diagnosis... - A broadband high-frequency electrical impedance tomography system for breast imagingRyan J Halter
Thayer School of Engineering, Dartmouth College, Hanover, NH 03755, USA
IEEE Trans Biomed Eng 55:650-9. 2008..0237 S/m at 10 kHz to 0.2174 S/m at 10 MHz. These findings are consistent with impedance values reported in the literature... - Experimental justification for using 3D conductivity reconstructions in electrical impedance tomographyRyan J Halter
Thayer School of Engineering, Dartmouth College, Hanover, NH 03755, USA
Physiol Meas 28:S115-27. 2007..2 in the particular case presented here. These findings should ultimately be incorporated to clinical imaging with EIT when circular electrode arrays are employed... - Electrical impedance spectroscopy of the human prostateRyan J Halter
Thayer School of Engineering, Dartmouth College, Hanover, NH 03755, USA
IEEE Trans Biomed Eng 54:1321-7. 2007..This is in agreement with trends observed in other tissues reported in much of the literature. Expanded studies are needed to further validate this finding and to explore the biological mechanism responsible for generating the results... - Arbitrary geometry patient interfaces for breast cancer detection and monitoring with electrical impedance tomographyPreston Manwaring
Thayer School of Engineering, Dartmouth College, 8000 Cummings Hall, Hanover, NH 03755, USA
Conf Proc IEEE Eng Med Biol Soc 2008:1178-80. 2008..Preliminary experimental results are presented... - Excitation patterns in three-dimensional electrical impedance tomographyHamid Dehghani
Thayer School of Engineering, Dartmouth College, Hanover, NH 03755, USA
Physiol Meas 26:S185-97. 2005..However, in terms of quantitative imaging an excitation pattern where all electrode layers are in phase produces better results... - Design and implementation of a high frequency electrical impedance tomography systemRyan Halter
Thayer School of Engineering, Dartmouth College, Hanover, NH 03755, USA
Physiol Meas 25:379-90. 2004..Signal generation and detection, software design and preliminary system specifications are discussed...