Fully automatic rapid microscope slide scanner
View Patent ↗Apparatus for and method of fully automatic rapid scanning and digitizing of an entire microscope sample, or a substantially large portion of a microscope sample, using a linear array detector synchronized with a positioning stage that is part of a computer controlled microscope slide scanner. The invention provides a method for composing the image strips obtained from successive scans of the sample into a single contiguous digital image. The invention also provides a method for statically displaying sub-regions of this large digital image at different magnifications, together with a reduced magnification macro-image of the entire sample. The invention further provides a method for dynamically displaying, with or without operator interaction, portions of the contiguous digital image. In one preferred embodiment of the invention, all elements of the scanner are part of a single-enclosure that has a primary connection to the Internet or to a local intranet. In this embodiment, the preferred sample type is a microscope slide and the illumination and imaging optics are consistent with transmission mode optics optimized for diffraction-limited digital imaging.
1. A system for creating a contiguous digital image of a portion of a microscope sample, comprising:
a motorized stage configured to support a microscope sample and move the microscope sample at a substantially constant velocity;
an illumination system configured to illuminate a portion of the microscope sample;
an objective lens positioned for viewing the illuminated portion of the microscope sample;
a line scan camera optically coupled with the objective lens, the line scan camera configured to create a digital image strip of a portion of the microscope sample, the digital image strip captured while the microscope sample is moving at substantially constant velocity;
a focus map having a plurality of focus points on the microscope sample;
a focusing system configured to focus the line scan camera during creation of each digital image strip in accordance with the focus map;
an image composer configured to align adjacent digital image strips into a contiguous digital image of a portion of the microscope sample; and
a data storage area configured to store the contiguous digital image.
2. The system of claim 1 , wherein the motorized stage further comprises:
a first motor configured to move the microscope sample in a first direction in the sample plane; and
a second motor configured to move the microscope sample in a second direction in the sample plane, wherein the second direction is orthogonal to the first direction.
3. The system of claim 2 , wherein the first motor is a servo motor.
4. The system of claim 1 , wherein the illuminated portion of the microscope sample comprises a linear field of view.
5. The system of claim 4 , wherein the illumination system is optimized to uniformly illuminate the linear field of view.
6. The system of claim 1 , wherein the focus map is non-planar.
7. The system of claim 1 , wherein the line scan camera is configured to capture red, green and blue color signals through discrete linear array sensors, wherein each linear array sensor is configured to capture 8 bits of data.
8. The system of claim 1 , wherein the focusing system comprises a piezo positioner that is communicatively coupled to a piezo controller.
9. The system of claim 8 , wherein the piezo controller and the piezo positioner are configured to adjust the focus of the line scan camera at least 10 times per second.
10. The system of claim 1 , wherein the contiguous digital image is a diffraction-limited contiguous digital image.
11. A method for creating a contiguous digital image of a portion of a microscope sample, comprising:
focusing a line scan camera having a linear field of view on a plurality of focus points within a microscope sample;
creating a focus map comprising the plurality of focus points;
moving a microscope sample at substantially constant velocity relative to the line scan camera, wherein a first strip of the microscope sample is exposed to the field of view of the line scan camera during said motion;
illuminating a portion of the first strip while the microscope sample is in motion;
scanning the illuminated portion of the first strip with the line scan camera while the sample is in motion;
adjusting the focus of the line scan camera during scanning of the first strip in accordance with the focus map;
storing a digital image of the first strip;
moving the microscope sample at substantially constant velocity relative to the line scan camera, wherein a substantially unscanned second strip of the microscope sample is exposed to the field of view of the line scan camera during said motion;
illuminating a portion of the second strip while the microscope sample is in motion;
scanning the illuminated portion of the second strip with the line scan camera while the sample is in motion;
adjusting the focus of the line scan camera during scanning of the second strip in accordance with the focus map;
storing a digital image of the second strip; and
composing the digital image of the first strip and the digital image of the second strip into a contiguous digital image.
12. The method of claim 11 , wherein the focus map is non-planar.
13. The method of claim 11 , wherein each adjusting step is carried out by a piezo positioner communicatively coupled with a piezo controller.
14. The method of claim 11 , wherein each moving step is carried out by a servo motor.
15. The method of claim 11 , wherein the digital image of the first strip has a first length and a first width and the digital image of the second strip has a second length and a second width, and wherein the first length and the second length are not equal.
16. The method of claim 15 , wherein the first width and the second width are equal.
17. The method of claim 15 , wherein the first width and the second width are not equal.
18. The method of claim 11 , wherein the first strip comprises a first perimeter edge of the sample and an opposing perimeter edge of the sample, wherein the first edge and the opposing edge are separated by at least 2 micrometers.
19. The method of claim 11 , wherein the second strip comprises a first perimeter edge of the sample and an opposing perimeter edge of the sample, wherein the first edge and the opposing edge are separated by at least 2 micrometers.
20. The method of claim 11 , wherein the microscope sample is moved in a first direction to scan the first strip and the microscope sample is moved in a second direction to scan the second strip.
21. The method of claim 20 , wherein the first direction and second direction are opposite directions.