Other

University of Toronto

Sunnybrook Research Institute

Enersion Inc.

Bahman Lashkari

Andreas Mandelis

Brian Courtney

Sergey A Telenkov

Stuart Foster

Kaicheng Zhang

Arshan Singh

Vignesh Krishnamurthy

Sung Soo Choi

Jingyuan Hou

Hanif Montazeri

Systems and methods are disclosed that facilitate the reduction of both radio frequency (RF) noise and photoacoustic artefacts in differential photoacoustic radar imaging through a multi-step electrical and optical domain calibration method. An example two-step calibration method involves reducing RF image noise via an initial calibration step that involves the control of the relative amplitudes and phases of electrical driving modulation waveforms, while a second calibration step involves the differential suppression of photoacoustic artefact signals via tuning, in the optical domain, of the relative intensity the optical beams that are delivered to the sample. Another example embodiment involves the use of the standard deviation of the unwrapped phase that is obtained, after performing frequency-domain cross-correlation and an inverse transform to the time domain, to improve the amplitude signal that is employed to generate a differential photoacoustic radar image.

Systems and methods for performing frequency-domain photoacoustic imaging

Disclosed is an adsorption-based heat pump useful for refrigeration and cooling/heating for applications such as HVACs and chillers. Adsorption is a surface phenomenon where a solid substance (adsorbent) attracts molecules of a gas or solution (refrigerant or adsorbate) on its surface. The latent heat of the adsorbate provides the heating/cooling effect. The novel adsorption heat pump enhances heat and/or mass transfer to and from the adsorbate. One embodiment comprises at least one evaporator, at least one desorber (adsorbent heating apparatus), at least one adsorbent cooling apparatus and at least one condenser. The embodiment employs different techniques to enhance heat and/or mass transfer.

Adsorption-based heat pump

The present disclosure provides systems and methods for imaging based on the generation and use of mismatched coded excitation signals. Cross-correlation properties of the received signal reveal the location and/or timing and/or properties of the source. The use of mismatched signals enables spatial and/or temporal and/or functional encoding of the transmitted signals. In some embodiments, high-speed imaging may be performed by employing mismatched codes for spatial and/or temporal encoding, and by employing a subset of transducer elements as transmitters, and another subset of elements as receivers. Various example embodiments of different types of mismatched codes are provided, including codes that employ multiple frequency chirps, codes that employ concatenated multi-frequency binary phase-coded waveforms, and chirped binary phase-coded waveforms.

Methods for generating multiple mismatched coded excitation signals

Systems and methods of frequency-domain photoacoustic imaging are provided utilizing an ultrasonic phased array probe and intensity modulated optical excitation with coding to improve signal-to-noise ratio. Embodiments employ frequency-domain photoacoustic imaging methodologies such as the photoacoustic radar, coupled with a multi-element ultrasonic sensor array to deliver spatially-resolved correlation images of photoacoustic sources, which may be employed to image optical heterogeneities within tissue-like scattering media.

Systems and methods for frequency-domain photoacoustic phased array imaging

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Richmond Hill, Canada

Bahman Lashkari