Systems and methods for in-operating-theatre imaging of fresh tissue resected during surgery for pathology assessment
The disclosed technology brings histopathology into the operating theatre, to enable real-time intra-operative digital pathology. The disclosed technology utilizes confocal imaging devices image, in the operating theatre, “optical slices” of fresh tissue—without the need to physically slice and otherwise process the resected tissue as required by frozen section analysis (FSA). The disclosed technology, in certain embodiments, includes a simple, operating-table-side digital histology scanner, with the capability of rapidly scanning all outer margins of a tissue sample (e.g., resection lump, removed tissue mass). Using point-scanning microscopy technology, the disclosed technology, in certain embodiments, precisely scans a thin “optical section” of the resected tissue, and sends the digital image to a pathologist rather than the real tissue, thereby providing the pathologist with the opportunity to analyze the tissue intra-operatively. Thus, the disclosed technology provides digital images with similar information content as FSA, but faster and without destroying the tissue sample itself.
1. A method for imaging a sample, the method comprising:
for each of a plurality of positions in a scan pattern and each of a plurality of micro optical elements comprised in a micro optical element array:
(i) focusing a portion of an illumination beam on or in the sample with the micro optical element,
(ii) collecting back-emitted light from the sample with the micro optical element, wherein illuminating the sample with the illumination beam causes the sample to emit the back-emitted light,
(iii) directing the back-emitted light toward a detector array, the detector array comprising detectors, wherein the number of the detectors in the detector array is more than the number of the micro optical elements in the micro optical element array, and
(iv) receiving, by the detector array, the back-emitted light; and
laterally moving, by a scanning stage, a position of the micro optical element array relative to the sample and to the detector array along the scan pattern while a position of the sample relative to the detector array remains fixed.
2. The method of claim 1 , comprising constructing, by a processor of a computing device, an image based on the back-emitted light received at the detector array from each of the micro optical elements at each position in the scan pattern.
3. The method of claim 2 , comprising sending, by the processor, via a network, the image to a second computing device such that the image can be viewed in a remote location.
4. The method of claim 2 , wherein (i) an imaging system comprises the micro optical element array and the scanning stage, (ii) the imaging system has a field of view of a size comparable to a size of the micro optical element array, and (iii) the image corresponds in size to the field of view.
5. The method of claim 1 , wherein a scan range of the micro optical element array over the scan pattern corresponds to a pitch of the array.
6. The method of claim 1 , wherein the sample is freshly resected tissue.
7. The method of claim 1 , wherein the method occurs intraoperatively.
8. The method of claim 1 , comprising detecting, independently by each of the detectors of the detector array, a portion of the back-emitted light collected by a micro optical element in the micro optical element array.
9. The method of claim 1 , comprising directing the illumination with a beam splitter toward the micro optical element array, wherein (iii) directing the back-emitted light toward the detector array comprises passing the back-emitted light through the beam splitter.
10. The method of claim 1 , wherein directing the back-emitted light toward the detector comprises rejecting out-of-focus light from reaching the detector.
11. The method of claim 1 , comprising expanding, by a beam expander disposed prior to the micro optical element array on an optical path, a waist of the illumination beam to a size comparable to a field of view to be illuminated.
12. The method of claim 1 , wherein focusing a portion of the illumination beam on or in the sample with the micro optical element causes the sample to be excited with the portion of the illumination beam such that the sample fluoresces, wherein the back-emitted light collected by each micro optical element in the micro optical element array comprises the fluorescence.
13. The method of claim 1 , comprising providing the illumination beam with a laser light source.
14. The method of claim 1 , wherein the micro optical element array comprises one or more intermediate areas, wherein each of the one or more intermediate areas is located in between a first micro optical element of the micro optical element array and a second micro optical element array, wherein the one or more intermediate areas is covered with an absorptive and/or reflective layer.
15. The method of claim 1 , wherein the micro optical element array comprises from 1,000 to 100,000 micro optical elements.
16. The method of claim 1 , wherein each micro optical element of the micro optical element array is a plano-convex-lens with a curved surface facing the sample.
17. The method of claim 1 , wherein the scanning stage is a two-axis positioning stage.
18. The method of claim 1 , wherein a ratio of the micro optical elements to the detectors is from 1:5 to 1:80.
19. The method of claim 1 , wherein the sample disposed on or over a transparent window.
20. The method of claim 1 , wherein the plurality of micro optical elements of the micro optical element array focuses onto a focal plane that is located in a range of from 10 μm to 200 μm above the transparent window.