Pulsed ultrasound modulated optical tomography using lock-in camera
First Claim
1. An ultrasound modulated optical tomography (UOT) system, comprising:
- an acoustic assembly configured for delivering ultrasound into a target voxel within an anatomical structure;
an interferometer configured for delivering sample light into the anatomical structure, whereby a portion of the sample light passing through the target voxel is scattered by the anatomical structure as signal light, and another portion of the sample light not passing through the target voxel is scattered by the anatomical structure as background light that combines with the signal light to create a sample light pattern, the interferometer further configured for combining reference light with the sample light pattern to generate an interference light pattern;
a controller configured for operating the acoustic assembly and the interferometer to pulse the ultrasound and the sample light in synchrony, such that only the signal light is frequency shifted by the ultrasound, the controller further configured for operating the interferometer to sequentially modulate the interference light pattern to generate a plurality of different interference light patterns;
a lock-in camera having an array of detectors configured for simultaneously detecting spatial components of each different interference light pattern, wherein each detector of the lock-in camera respectively stores a plurality of values in a plurality of bins of the lock-in camera representative of the respective spatial components of the interference light patterns, wherein the controller is configured for synchronizing operation of the acoustic assembly, the interferometer, and the array of detectors of the lock-in camera, such that the different interference light patterns are detected at specific points on a cycle of the ultrasound; and
a processor configured for determining a physiologically-dependent optical parameter of the target voxel based on the plurality of values stored in the bins of each detector.
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Abstract
A system and method of performing ultrasound modulated optical tomography. Ultrasound is delivered into a target voxel in an anatomical structure, and sample light is delivered into the anatomical structure, whereby a portion of the sample light passing through the target voxel is scattered by the biological tissue as signal light, and a portion of the sample light not passing through the target voxel is scattered by the anatomical structure as background light. The ultrasound and sample light are pulsed in synchrony, such that only the signal light is frequency shifted by the ultrasound. Reference light is combined with the signal light and background light to generate an interference light pattern, which is sequentially modulated to generate a plurality of different interference light patterns. Spatial components of each of the different interference light patterns are simultaneously detected and stored in bins.
166 Citations
29 Claims
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1. An ultrasound modulated optical tomography (UOT) system, comprising:
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an acoustic assembly configured for delivering ultrasound into a target voxel within an anatomical structure; an interferometer configured for delivering sample light into the anatomical structure, whereby a portion of the sample light passing through the target voxel is scattered by the anatomical structure as signal light, and another portion of the sample light not passing through the target voxel is scattered by the anatomical structure as background light that combines with the signal light to create a sample light pattern, the interferometer further configured for combining reference light with the sample light pattern to generate an interference light pattern; a controller configured for operating the acoustic assembly and the interferometer to pulse the ultrasound and the sample light in synchrony, such that only the signal light is frequency shifted by the ultrasound, the controller further configured for operating the interferometer to sequentially modulate the interference light pattern to generate a plurality of different interference light patterns; a lock-in camera having an array of detectors configured for simultaneously detecting spatial components of each different interference light pattern, wherein each detector of the lock-in camera respectively stores a plurality of values in a plurality of bins of the lock-in camera representative of the respective spatial components of the interference light patterns, wherein the controller is configured for synchronizing operation of the acoustic assembly, the interferometer, and the array of detectors of the lock-in camera, such that the different interference light patterns are detected at specific points on a cycle of the ultrasound; and a processor configured for determining a physiologically-dependent optical parameter of the target voxel based on the plurality of values stored in the bins of each detector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of performing pulsed ultrasound modulated optical tomography (UOT), comprising:
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delivering ultrasound into a target voxel within an anatomical structure; delivering sample light into the anatomical structure, whereby a portion of the sample light passing through the target voxel is scattered by the anatomical structure as signal light, and another portion of the sample light not passing through the target voxel is scattered by the anatomical structure as background light that combines with the signal light to create a sample light pattern; pulsing the ultrasound and the sample light in synchrony, such that only the signal light is frequency shifted by the ultrasound; combining reference light with the sample light pattern to generate an interference light pattern; sequentially modulating the interference light pattern to generate a plurality of different interference light patterns; simultaneously detecting spatial components of each different interference light pattern with a lock-in camera; synchronizing the delivery of the ultrasound, the delivery of the sample light, and the detection of the different interference light patterns, such that the different interference light patterns are detected at specific points on a cycle of the ultrasound; storing a plurality of values for each detected spatial component in a plurality of bins of the lock-in camera, the plurality of values being representative of the spatial component for the respective interference light patterns; and determining a physiologically-dependent optical parameter of the target voxel based on the plurality of values stored in the bins. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification