Dr. F. Stuart Foster Profile

Dr. F. Stuart Foster

at Sunnybrook Health Sciences Ctr

SPIE Involvement:

Author

Publications (14)

SPIE Journal Paper | 13 June 2019 Open Access

Frequency-domain differential photoacoustic radar: theory and validation for ultrasensitive atherosclerotic plaque imaging

Sung Soo Sean Choi, Bahman Lashkari, Andreas Mandelis, Jungik Son, Natasha Alves-Kotzev, Stuart F. Foster, Mark Harduar, Brian Courtney

JBO, Vol. 24, Issue 06, 066003, (June 2019) https://doi.org/10.1117/12.10.1117/1.JBO.24.6.066003

KEYWORDS: Photoacoustic spectroscopy, Signal processing, Radar, Signal to noise ratio, Intravascular ultrasound, Modulation, Tissues, Absorption, Interference (communication), Imaging systems

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Proceedings Article | 1 March 2019 Presentation + Paper

Intraoperative vascular detection and three-dimensional reconstruction using statistical variance and infrared optical tracking methods in high frequency ultrasound imaging

Shaurya Gupta, Chaoliang Chen, Yuta Dobashi, Emmanuel Cherin, Joel Ramjist, Stuart Foster, Albert Yee, Victor X. Yang

Proceedings Volume 10864, 108640K (2019) https://doi.org/10.1117/12.2510829

KEYWORDS: Ultrasonography, Speckle, Doppler effect, Surgery, Tissues, Blood, Blood circulation, Reconstruction algorithms, Navigation systems, Optical tracking

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Proceedings Article | 27 February 2019 Presentation + Paper

Frequency-domain differential photoacoustic radar: theory and simulation for ultra-sensitive cholesterol imaging

Sung Soo Sean Choi, Bahman Lashkari, Andreas Mandelis, Jill Weyers, Aaron Boyes, Cindy Yang, Stuart F. Foster, Natasha Alves-Kotzev, Mark Harduar, Brian Courtney

Proceedings Volume 10878, 1087812 (2019) https://doi.org/10.1117/12.2505885

KEYWORDS: Signal processing, Photoacoustic imaging, Endoscopy

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Proceedings Article | 13 March 2017 Presentation + Paper

Development of a high frequency single-element ultrasound needle transducer for anesthesia delivery

Golafsoun Ameri, Jungik Son, Jingwei Liang, F. Stuart Foster, Sugantha Ganapathy, Terry Peters

Proceedings Volume 10139, 101390S (2017) https://doi.org/10.1117/12.2254494

KEYWORDS: Transducers, Ultrasonography, Epoxies, Tissues, Prototyping, Glasses, Performance modeling

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Proceedings Article | 19 May 2016 Paper

Acoustic angiography: a new high frequency contrast ultrasound technique for biomedical imaging

Sarah Shelton, Brooks Lindsey, Ryan Gessner, Yueh Lee, Stephen Aylward, Hyunggyun Lee, Emmanuel Cherin, F. Stuart Foster, Paul Dayton

Proceedings Volume 9871, 987109 (2016) https://doi.org/10.1117/12.2229179

KEYWORDS: Acoustics, Angiography, Ultrasonography, Transducers, Tissues, Image resolution, Tumors, Imaging systems, In vivo imaging, Cancer

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Proceedings Article | 15 March 2016 Presentation + Paper

Characterization of an intraluminal differential frequency-domain photoacoustics system

Bahman Lashkari, Jungik Son, Simon Liang, Robin Castelino, F. Stuart Foster, Brian Courtney, Andreas Mandelis

Proceedings Volume 9708, 970808 (2016) https://doi.org/10.1117/12.2214152

KEYWORDS: Photoacoustic spectroscopy, Imaging spectroscopy, Spectroscopy, Absorption, Endoscopy, Optical coherence tomography, Photoacoustic imaging, Ultrasonography, Intravascular ultrasound, Arteries

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Proceedings Article | 11 March 2015 Paper

Clinical study of ex vivo photoacoustic imaging in endoscopic mucosal resection tissues

Liang Lim, Catherine Streutker, Norman Marcon, Maria Cirocco, Vladimir Lakovlev, Ralph DaCosta, F. Foster, Brian Wilson

Proceedings Volume 9323, 932307 (2015) https://doi.org/10.1117/12.2075451

KEYWORDS: Tissues, Endoscopy, Ultrasonography, Transducers, Photoacoustic spectroscopy, Blood, Photoacoustic imaging, Cancer, In vivo imaging, Digital photography

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Proceedings Article | 20 March 2014 Paper

Design and fabrication of a low-frequency (1-3 MHz) ultrasound transducer for accurate placement of screw implants in the spine

Amir Manbachi, Mike Lee, F. Stuart Foster, Howard Ginsberg, Richard S. Cobbold

Proceedings Volume 9040, 90400H (2014) https://doi.org/10.1117/12.2042965

KEYWORDS: Transducers, Bone, Ultrasonography, Surgery, Composites, Spine, Acoustics, Signal attenuation, Epoxies, Phased arrays

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Proceedings Article | 19 February 2011 Paper

Development and validation of a combined photoacoustic micro-ultrasound system for in vivo oxygen saturation estimation

A. Needles, A. Heinmiller, P. Ephrat, D. Bates, C. Bilan-Tracey, C. Theodoropoulos, D. Hirson, F. Foster

Proceedings Volume 7899, 78992D (2011) https://doi.org/10.1117/12.875846

KEYWORDS: Oxygen, Ischemia, Blood, Imaging systems, In vivo imaging, Photoacoustic spectroscopy, Ultrasonography, Tissues, Veins, 3D image processing

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Proceedings Article | 24 February 2010 Paper

Femtosecond photoacoustics: integrated two-photon fluorescence and photoacoustic microscopy

Martijn van Raaij, Mike Lee, Emmanuel Chérin, Bojana Stefanovic, F. Stuart Foster

Proceedings Volume 7564, 75642E (2010) https://doi.org/10.1117/12.841021

KEYWORDS: Photoacoustic spectroscopy, Transducers, Femtosecond phenomena, Luminescence, Ultrasonography, Signal detection, Photoacoustic imaging, Absorption, Spatial resolution, Photoacoustic microscopy

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Proceedings Article | 28 April 2004 Paper

Noninvasive elasticity imaging in small vessels: validation on tissue-mimicking phantoms

Roch Maurice, Michel Daronat, Nicolas Pivert, F. Foster, Guy Cloutier

Proceedings Volume 5373, (2004) https://doi.org/10.1117/12.530698

KEYWORDS: Tissues, Ultrasonography, Elastography, Arteries, In vitro testing, Speckle, Composites, Transducers, Motion estimation, Intravascular ultrasound

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Proceedings Article | 12 April 2000 Paper

Cross-correlation of ultrasound A-lines to obtain dynamic displacement profiles within poroelastic materials undergoing stress relaxation

Manuel Fortin, Michael Buschmann, Michel Bertrand, F. Foster, Jonathan Ophir

Proceedings Volume 3982, (2000) https://doi.org/10.1117/12.382237

KEYWORDS: Ultrasonography, Transducers, Cartilage, Elastography, Tissues, Microscopes, Statistical modeling, Interfaces, Statistical analysis, Photography

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Proceedings Article | 1 May 1998 Paper

Single-element and linear-array transducer design for ultrasound biomicroscopy

Marc Lukacs, Michael Sayer, Stuart Foster

Proceedings Volume 3341, (1998) https://doi.org/10.1117/12.308010

KEYWORDS: Transducers, Composites, Ceramics, Ferroelectric materials, Chemical elements, Excimer lasers, Aluminum, Micromachining, Laser cutting, Pulsed laser operation

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Ceramic ultrasonic transducers with a frequency response <50MHz using lead zirconate titanate (PZT) layers in the 5-4Otm range have been difficult to achieve by bulk or thin film techniques. Advances in the production of small sized PZT ceramic powder allow the development ofthinner ceramic layers for this application. Sol gel composite thin film technology also provides a new technique for producing ceramic coatings of a thickness that successfully bridges the gap between traditional thin film and bulk techniques. So! gel composite PZT layers of 5-7Om have been coated on substrates (aluminum, platinized silicon, stainless steel, .. .) that can withstand the thermal processing of the ceramic. The thickness mode response of a thin piezoelectric layer supported by a thick substrate has been modeled from first principles using complex material constants. The LevenbergMarquart non linear regression technique has been used to extract the thickness mode elastic stiffness, dielectric constant and piezoelectric constant of the PZT, and the elastic stiffness of the substrate from the layered structure. This non-destructive technique allows for a reliable assessment of the quality of a coating prior to the fabrication of a transducer. The elastic stiffness of the substrate is not lossy enough for the required broadband response of an imaging transducer. However, aluminum can be preferentially etched, releasing the ceramic coating. Therefore it is possible to transfer the PZT film to a more suitable backing material. A processing sequence for single element PZT transducers in the frequency range of 50-200MHz has been developed. Characterization of transducers has been performed using pulse-echo techniques and by creating real time B-scan images of agar phantoms and biological tissue. Methods for patterning the PZT composite coatings are being developed with the intent to fabricate a linear array in the 40-60 MHz frequency range. Due to the very fine patterning and high concentration of cuts required for a high aspect ratio linear array, the limits of conventional etching techniques are surpassed. Laser micromachining using a frequency doubled Nd:YAG and a KrF excimer laser have the ability to pattern the array structure. In both cases, laser cuts <1Om wide have been achieved.

Proceedings Article | 5 November 1992 Paper

Two-dimensional transducer arrays for medical ultrasound: beamforming and imaging (Invited Paper)

Daniel Turnbull, F. Foster

Proceedings Volume 1733, (1992) https://doi.org/10.1117/12.130598

KEYWORDS: Transducers, Ultrasonography, Phased arrays, Scattering, Spherical lenses, Ferroelectric polymers, Imaging arrays, Laser scattering, Electrodes, Medical imaging

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Showing 5 of 14 publications

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