Method and apparatus for quantitative and depth resolved hyperspectral fluorescence and reflectance imaging for surgical guidance
First Claim
1. An optical and image processing system comprising:
- a light source adapted to provide, in a first mode, light at a fluorescent stimulus wavelength;
a spatial modulator coupled to modulate light from the light source, forming spatially modulated fluorescent stimulus light, the spatial modulator configured to provide a plurality of different spatial light modulation patterns comprising light at the fluorescent stimulus wavelength, the spatial light modulation patterns each characterized by a spatial frequency;
projection apparatus configured to project onto tissue the spatially modulated fluorescent stimulus light, the tissue being illuminated with the plurality of different spatial light modulation patterns at the fluorescent stimulus wavelength, each spatial light pattern providing light varying in intensity across the tissue according to the spatial frequency;
a hyperspectral camera configured to receive light from the tissue and generate images therefrom; and
an image processing system coupled to the hyperspectral camera and configured with a memory containing machine readable instructions for performing depth resolved, fluorescent imaging by driving the spatial modulator to provide at least a first and a second predetermined spatial-light modulation pattern of the plurality of different spatial light modulation patterns, receiving first images generated by the hyperspectral camera at the fluorescent stimulus wavelength, at least one second image at a first fluorescent emissions wavelength while the tissue is illuminated with light of the fluorescent stimulus wavelength, and at least one third image at a second fluorescent emissions wavelength different from the first fluorescent emissions wavelength while the tissue is illuminated with the light of the fluorescent stimulus wavelength, for processing the received first, second, and third images generated by the hyperspectral camera to generate processed fluorescent images, and for displaying the processed fluorescent images;
wherein the first predetermined spatial light modulation pattern has a same spatial frequency as the second predetermined spatial light modulation pattern, and wherein the first predetermined spatial modulation pattern has spatial phase different from a spatial phase of the second predetermined spatial modulation pattern;
wherein the machine readable instructions for generating the processed fluorescent images comprise instructions for;
determining a relationship between depth and ratios of intensity in the second and third images for a fluorophore in tissue from images of the tissue as illuminated with the plurality of different spatial light modulation patterns;
applying stimulus wavelength light; and
determining a depth of the fluorophore at each pixel based upon the relationship between depth and the ratios of intensity in the second and third images;
where the hyperspectral camera is adapted to pass light received from the tissue through a filter device selected from the group consisting of a tiling pattern of optical filters on photosensors of an image sensor, the tiling pattern of optical filters comprising filters of at least 13 distinct wavelength bands between 400 nanometers and 1000 nanometers, and a tunable filter.
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Accused Products
Abstract
An imaging system, such as a surgical microscope, laparoscope, or endoscope or integrated with these devices, includes an illuminator providing patterned white light and/or fluorescent stimulus light. The system receives and images light hyperspectrally, in embodiments using a hyperspectral imaging array, and/or using narrowband tunable filters for passing filtered received light to an imager. Embodiments may construct a 3-D surface model from stereo images, and will estimate optical properties of the target using images taken in patterned light or using other approximations obtained from white light exposures. Hyperspectral images taken under stimulus light are displayed as fluorescent images, and corrected for optical properties of tissue to provide quantitative maps of fluorophore concentration. Spectral information from hyperspectral images is processed to provide depth of fluorophore below the tissue surface. Quantitative images of fluorescence at depth are also prepared. The images are displayed to a surgeon for use in surgery.
80 Citations
15 Claims
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1. An optical and image processing system comprising:
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a light source adapted to provide, in a first mode, light at a fluorescent stimulus wavelength; a spatial modulator coupled to modulate light from the light source, forming spatially modulated fluorescent stimulus light, the spatial modulator configured to provide a plurality of different spatial light modulation patterns comprising light at the fluorescent stimulus wavelength, the spatial light modulation patterns each characterized by a spatial frequency; projection apparatus configured to project onto tissue the spatially modulated fluorescent stimulus light, the tissue being illuminated with the plurality of different spatial light modulation patterns at the fluorescent stimulus wavelength, each spatial light pattern providing light varying in intensity across the tissue according to the spatial frequency; a hyperspectral camera configured to receive light from the tissue and generate images therefrom; and an image processing system coupled to the hyperspectral camera and configured with a memory containing machine readable instructions for performing depth resolved, fluorescent imaging by driving the spatial modulator to provide at least a first and a second predetermined spatial-light modulation pattern of the plurality of different spatial light modulation patterns, receiving first images generated by the hyperspectral camera at the fluorescent stimulus wavelength, at least one second image at a first fluorescent emissions wavelength while the tissue is illuminated with light of the fluorescent stimulus wavelength, and at least one third image at a second fluorescent emissions wavelength different from the first fluorescent emissions wavelength while the tissue is illuminated with the light of the fluorescent stimulus wavelength, for processing the received first, second, and third images generated by the hyperspectral camera to generate processed fluorescent images, and for displaying the processed fluorescent images; wherein the first predetermined spatial light modulation pattern has a same spatial frequency as the second predetermined spatial light modulation pattern, and wherein the first predetermined spatial modulation pattern has spatial phase different from a spatial phase of the second predetermined spatial modulation pattern; wherein the machine readable instructions for generating the processed fluorescent images comprise instructions for; determining a relationship between depth and ratios of intensity in the second and third images for a fluorophore in tissue from images of the tissue as illuminated with the plurality of different spatial light modulation patterns; applying stimulus wavelength light; and determining a depth of the fluorophore at each pixel based upon the relationship between depth and the ratios of intensity in the second and third images; where the hyperspectral camera is adapted to pass light received from the tissue through a filter device selected from the group consisting of a tiling pattern of optical filters on photosensors of an image sensor, the tiling pattern of optical filters comprising filters of at least 13 distinct wavelength bands between 400 nanometers and 1000 nanometers, and a tunable filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An optical and image processing system comprising:
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a light source adapted to provide, in a first mode, light at a fluorescent stimulus wavelength; a spatial modulator coupled to modulate light from the light source, forming spatially modulated fluorescent stimulus light, the spatial modulator configured to provide a plurality of different spatial light modulation patterns comprising light at the fluorescent stimulus wavelength, the spatial light modulation patterns each characterized by a spatial frequency; projection apparatus configured to project onto tissue the spatially modulated fluorescent stimulus light, the tissue being illuminated with the plurality of different spatial light modulation patterns at the fluorescent stimulus wavelength, each spatial light pattern providing light varying in intensity across the tissue according to the spatial frequency; a hyperspectral camera configured to receive light from the tissue and generate images therefrom; and an image processing system coupled to the hyperspectral camera and configured with a memory containing machine readable instructions for performing depth resolved, fluorescent imaging by driving the spatial modulator to provide at least a first and a second predetermined spatial-light modulation pattern of the plurality of different spatial light modulation patterns, receiving first images generated by the hyperspectral camera at the fluorescent stimulus wavelength, at least one second image at a first fluorescent emissions wavelength, and at least one third image at a second fluorescent emissions wavelength, for processing the received first, second, and third images generated by the hyperspectral camera to generate processed fluorescent images, and for displaying the processed fluorescent images; wherein the first predetermined spatial light modulation pattern has a same spatial frequency as the second predetermined spatial light modulation pattern, and wherein the first predetermined spatial modulation pattern has spatial phase different from a spatial phase of the second predetermined spatial modulation pattern; determining a relationship between depth and ratios of intensity in the second and third images for a fluorophore in tissue; applying stimulus wavelength light; determining a depth of the fluorophore at each pixel based upon the relationship between depth and the ratios of intensity in the second and third images; and wherein the relationship between depth and ratios of intensity at the first and the second fluorescent emissions wavelengths are determined from images of the tissue; wherein the machine readable instructions further comprise instructions for determining optical properties of tissue, the optical properties of tissue including at least absorbance, and for correcting depth-resolved fluorescent images for the absorbance to provide images of absolute fluorophore concentration; wherein the optical properties of tissue are determined at each voxel of a three-dimensional voxel-based model, and the three-dimensional voxel-based model is used in constructing the images of absolute fluorophore concentration; and wherein fluorophore concentration parameters of the three-dimensional voxel-based model are fit to at least the obtained second and third images, the fitting including simulating the three-dimensional voxel-based model using Monte Carlo based modeling of near-surface voxels and diffusion-based modeling of deep voxels.
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Specification