Compact light sensor
Inventors
Darty, Mark Anthony • Tilleman, Michael • Meenen, Peter • YUDOVSKY, Dmitry
Assignees
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Publication Number
US-9746377-B2
Publication Date
2017-08-29
Expiration Date
Abstract
Provided are methods and systems for concurrent imaging at multiple wavelengths. In one aspect, a hyperspectral/multispectral imaging device includes a lens configured to receive light backscattered by an object, a plurality of photo-sensors, a plurality of bandpass filters covering respective photo-sensors, where each bandpass filter is configured to allow a different respective spectral band to pass through the filter, and a plurality of beam splitters in optical communication with the lens and the photo-sensors, where each beam splitter splits the light received by the lens into a plurality of optical paths, each path configured to direct light to a corresponding photo-sensor through the bandpass filter corresponding to the respective photo-sensor.
Core Innovation
The invention relates to a compact imaging architecture that concurrently collects a set of eight to twelve images for determining oxyhemoglobin and deoxyhemoglobin content of a tissue. A lens receives light emitted from at least one light source and backscattered by the tissue, and the received light is routed to multiple photo-sensors in optical communication with the lens. Each photo-sensor collects an image corresponding to a different spectral band using multi-bandpass filters.
Multi-bandpass filters are provided such that each respective multi-bandpass filter covers a corresponding photo-sensor, selectively allowing a different corresponding spectral band of light from the lens to pass through to the corresponding photo-sensor. Each image in the set of eight to twelve images is collected at a discrete spectral band, and the set comprises images collected at any seven or more spectral bands of a predetermined set having central wavelengths 520±5 nm, 540±5 nm, 560±5 nm, 580±5 nm, 590±5 nm, 610±5 nm, 620±5 nm, and 640±5 nm.
The described imaging system concepts include compact hyperspectral or multispectral configurations using optical splitting into multiple optical paths and beam steering elements directing light to corresponding sensors. The document further describes an optional polarizer and polarization rotator to improve illumination efficiency and reduce specular reflection, and fixed-focus optics with projected framing guides for positioning. Example configurations are described using discrete wavelength sets assembled into a hyperspectral data cube for oxyhemoglobin/deoxyhemoglobin measurement.
Claims Coverage
Independent claim clm-00001 is directed to an imaging device that collects eight to twelve tissue images at discrete spectral bands for oxyhemoglobin and deoxyhemoglobin determination. The partial claim set indicates that dependent claims refine spectral band characteristics, illumination spectral-range partitioning, optical-path splitting with beam splitters, optional composite image combination, and portable power arrangements.
Tissue oxyhemoglobin/deoxyhemoglobin multi-band imaging device
An imaging device configured to collect a set of eight to twelve images for determining oxyhemoglobin and deoxyhemoglobin content of a tissue, including a light source, a lens receiving light emitted from the light source and backscattered by the tissue, a plurality of photo-sensors in optical communication with the lens and configured to collect the set of eight to twelve images, and a plurality of multi-bandpass filters.
Multi-bandpass filter per photo-sensor selective spectral band collection
A plurality of multi-bandpass filters wherein each respective multi-bandpass filter covers a corresponding photo-sensor thereby selectively allowing a different corresponding spectral band of light to pass through to the corresponding photo-sensor, wherein each image in the set of eight to twelve images is collected at a discrete spectral band.
Predetermined wavelength set central wavelengths for discrete bands
The set of eight to twelve images comprises images collected at any seven or more spectral bands of a predetermined set of spectral bands having central wavelengths 520±5 nm, 540±5 nm, 560±5 nm, 580±5 nm, 590±5 nm, 610±5 nm, 620±5 nm, and 640±5 nm.
Across the provided claim material, the inventive focus is the use of a lens receiving backscattered tissue light combined with multiple photo-sensors and multi-bandpass filters that assign discrete spectral bands to corresponding photo-sensors, collecting images at seven or more bands from a predetermined oxyhemoglobin/deoxyhemoglobin wavelength set.
Stated Advantages
Enables determining oxyhemoglobin and deoxyhemoglobin content of a tissue using a set of eight to twelve images at discrete spectral bands.
Allows selective pass-through of different corresponding spectral bands to corresponding photo-sensors using multi-bandpass filters.
Provides a compact hyperspectral/multispectral data cube concept for oxyhemoglobin/deoxyhemoglobin measurement using the discrete wavelength sets described.
Documented Applications
Tissue oximetry based on determining oxyhemoglobin and deoxyhemoglobin content of a tissue using an imaging device that collects eight to twelve spectral-band images.
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