Whole slide multispectral imaging systems and methods
The methods and systems disclosed herein include obtaining a first plurality of images of a sample, where each image in the first plurality of images corresponds to a different spectral band of illumination light incident on the sample or emission light from the sample, obtaining a second plurality of images of the sample, where each image in the second plurality of images corresponds to a different spectral band of illumination light incident on the sample or emission light from the sample, aligning the first and second pluralities of images based on information from a first image from the first plurality of images and a second image from the second plurality of images, where the first and second images correspond to a shared spectral band, and combining at least some members of the first plurality of images and at least some members of the second plurality of images to form an image stack.
1. A method, comprising:
obtaining a first plurality of images of a sample, wherein each image in the first plurality of images corresponds to a different spectral band of illumination light incident on the sample or emission light from the sample;
obtaining a second plurality of images of the sample, wherein each image in the second plurality of images corresponds to a different spectral band of illumination light incident on the sample or emission light from the sample, and wherein at least one member of the second plurality of images is obtained after at least one member of the first plurality of images; and
using an electronic processor to:
spatially register the first and second pluralities of images based on information corresponding to one or more sample points from a first image from the first plurality of images and from a second image from the second plurality of images, wherein the first and second images correspond to a common spectral emission band, and wherein spatially registering the first and second pluralities of images comprises applying a transformation to at least one of the first and second pluralities of images; and
combine at least some members of the first plurality of images and at least some members of the second plurality of images to form an image stack.
2. The method of claim 1 , wherein each pixel in the image stack comprises spectral information derived from at least one member of the first plurality of images and spectral information derived from at least one member of the second plurality of images.
3. The method of claim 1 , wherein each member of the first and second pluralities of images in the image stack corresponds to a common region of the sample.
4. The method of claim 1 , wherein each pixel in the image stack comprises spectral information corresponding to at least 5 different spectral bands of illumination light incident on the sample or emission light from the sample.
5. The method of claim 1 , further comprising using the electronic processor to unmix the image stack to obtain one or more component images, each of the component images comprising contributions from substantially only one component in the sample.
6. The method of claim 5 , wherein one of the component images corresponds to autofluorescence from the sample.
7. The method of claim 5 , wherein one of the component images corresponds to a component of the sample other than autofluorescence.
8. The method of claim 5 , further comprising using the electronic processor to analyze the sample based on the one or more component images to determine locations of features within the sample.
9. The method of claim 1 , wherein each member of the first and second pluralities of images corresponds to fluorescence emission from the sample.
10. The method of claim 9 , wherein each member of the first plurality of images corresponds to fluorescence emission from the sample following illumination of the sample with light in a different wavelength band, and wherein each member of the second plurality of images corresponds to fluorescence emission from the sample following illumination of the sample with light in a different wavelength band.
11. The method of claim 10 , further comprising using a color camera to obtain the first and second pluralities of images.
12. The method of claim 1 , wherein the transformation comprises applying a Cartesian translation to at least one of the first and second pluralities of images.
13. The method of claim 1 , wherein the transformation comprises rotating at least one of the first and second pluralities of images.
14. The method of claim 1 , wherein the transformation comprises at least one of warping and changing a magnification of at least one of the first and second pluralities of images.
15. The method of claim 1 , further comprising determining a magnitude of the transformation by performing a cross-correlation between the first and second images.
16. A system, comprising:
an illumination source configured to illuminate a sample with illumination light;
a detector configured to obtain one or more images of the sample; and
an electronic processor coupled to the detector and configured to:
obtain a first plurality of images of the sample, wherein each image in the first plurality of images corresponds to a different spectral band of illumination light incident on the sample from the illumination source or emission light from the sample;
obtain a second plurality of images of the sample, wherein each image in the second plurality of images corresponds to a different spectral band of illumination light incident on the sample from the illumination source or emission light from the sample, and wherein at least one member of the second plurality of images is obtained after at least one member of the first plurality of images;
spatially register the first and second pluralities of images based on information corresponding to one or more sample points from a first image from the first plurality of images and from a second image from the second plurality of images, wherein the first and second images correspond to a common spectral emission band, and wherein spatially registering the first and second pluralities of images comprises applying a transformation to at least one of the first and second pluralities of images; and
combine at least some members of the first plurality of images and at least some members of the second plurality of images to form an image stack.
17. The system of claim 16 , wherein each pixel in the image stack comprises spectral information derived from at least one member of the first plurality of images and spectral information derived from at least one member of the second plurality of images.
18. The system of claim 16 , wherein each member of the first and second pluralities of images in the image stack corresponds to a common region of the sample.
19. The system of claim 16 , wherein each pixel in the image stack comprises spectral information corresponding to at least 5 different spectral bands of illumination light incident on the sample or emission light from the sample.
20. The system of claim 16 , wherein the electronic processor is configured to unmix the image stack to obtain one or more component images, each of the component images comprising contributions from substantially only one component in the sample.
21. The system of claim 20 , wherein one of the component images corresponds to autofluorescence from the sample.
22. The system of claim 20 , wherein one of the component images corresponds to a component of the sample other than autofluorescence.
23. The system of claim 20 , wherein the electronic processor is configured to analyze the sample based on the one or more component images to determine locations of features within the sample.
24. The system of claim 16 , wherein each member of the first and second pluralities of images corresponds to fluorescence emission from the sample.
25. The system of claim 24 , wherein each member of the first plurality of images corresponds to fluorescence emission from the sample following illumination of the sample with light in a different wavelength band, and wherein each member of the second plurality of images corresponds to fluorescence emission from the sample following illumination of the sample with light in a different wavelength band.
26. The system of claim 25 , wherein the detector comprises a color camera, and wherein the electronic processor is configured to use the color camera to obtain the first and second pluralities of images.