Optoacoustic probe
An optoacoustic probe for optoacoustic imaging of a tissue is provided. The probe has a distal end operable to contact the tissue and a proximal end. A transducer assembly is configured to receive optoacoustic return signals. An optical window is configured to carry light along a light path to the tissue. The housing comprises a distal portion that has a probe face that includes an acoustic opening into which the transducer assembly is disposed and an optical opening into which the optical window is disposed. The transducer assembly and the optical window extend proximally from the probe face. A gasket is disposed within the optical opening at the probe face and extends at least partially around the optical window. The gasket is configured to form an optoacoustic barrier to at least partially optically and acoustically isolate at least a portion of the optical window from the housing of the probe.
1. An optoacoustic probe for optoacoustic imaging of a tissue, the probe having a distal end operable to contact the tissue and a proximal end, the probe comprising:
a transducer assembly configured to receive optoacoustic return signals;
an optical window configured to carry light along a light path to the tissue; and
a housing comprising:
(i) a distal portion having a probe face that includes an acoustic opening into which the transducer assembly is disposed and an optical opening into which the optical window is disposed, the transducer assembly and the optical window extending proximally from the probe face; and
(ii) a gasket disposed within the optical opening at the probe face and engaging and extending around the optical window, the gasket configured to form an optoacoustic barrier to optically and acoustically isolate a portion of the optical window from the housing of the probe.
2. The optoacoustic probe of claim 1 , wherein the transducer assembly comprises an acoustic lens in acoustic communication with an acoustic transducer, the acoustic lens having a distal face and a proximal end, the distal face being adjacent to the probe face, and the proximal end being adjacent the acoustic transducer, wherein the gasket is positioned between the optical window and the acoustic lens.
3. The optoacoustic probe of claim 1 , wherein the housing is made from an optically reflective material that comprises at least one of acrylonitrile-butadiene styrene or polybutylene terephthalate.
4. The optoacoustic probe of claim 1 , wherein the gasket comprises a crystal structure having anisotropic thermal expansion properties that form the optoacoustic barrier by constrain generation of acoustic waves from stray light within the gasket, thereby constraining propagation of acoustic waves from the gasket to the housing.
5. The optoacoustic probe of claim 4 , wherein the gasket comprises silicone embedded with the crystalline structure, the crystalline structure comprising at least one of i) titanium dioxide or ii) boron nitride, at a level of from 1% to 15% by weight of the gasket to provide the at least partial optical isolation.
6. The optoacoustic probe of claim 4 , wherein the gasket comprises silicone embedded with microspheres at a level of from 2% to 25% by weight of the gasket to provide the at least partial acoustic isolation.