Devices and methods to image objects
View Patent ↗Devices and methods for automated collection and image analysis are disclosed that enable identification or classification of microscopic objects aligned or deposited on surfaces. Such objects, e.g. detectably labeled rare target cells, are magnetically or non-magnetically immobilized and subjected to automated laser scanning to generate sequential digitized x-y sub-images or partial images of target and non-target objects that are combined to form reconstructed full images, thereby allowing detection, enumeration, differentiation and characterization of imaged objects on the basis of size, morphology and immunophenotype.
1. An apparatus for automatically scanning magnetically and detectably labeled micron-sized objects on a planar surface whereon said objects are aligned in a linear array by magnetic means, comprising:
a. one or more laser light sources;
b. a polarized beam splitter with feedback detector;
c. a dichroic mirror assembly;
d. a focusing lens assembly;
e. a sample chamber having affixed thereto at least two parallel nickel lines in the x-direction thereby to form a linear array, said sample chamber being inserted into a magnet system stably affixed to said x-y stage, thereby providing means for collecting, aligning and transporting said collected labeled objects into said focused light beam in a stepwise and digitized mode;
f. means for acquiring the sequential digitized signals images emanating from said labeled objects as digitized sub-images by means of a CCD camera and one or more PMT tubes;
g. means for storing said acquired sub-images in computer memory indexed to the corresponding z-y stage position; and
h. means for reconstructing a full image having combined multiple digitized sub-images of said objects on said linear array.
2. The apparatus of claim 1 wherein the parallel nickel lines on said linear array are spaced about 10 um apart.
3. The apparatus of claim 1 in which the CCD camera has a frame rate commensurate with the scan speed of the stage, thereby to maintain a resolution of at least 0.2 um.
4. An apparatus for analytical imaging of target entities, said apparatus comprising:
a. a sample chamber which includes a collection surface wherein said collection surface comprises nickel lines on a glass substrate;
b. an arrangement of magnets capable of manipulating magnetically labeled target entities towards said collection surface;
c. at least one light source;
d. a camera capable of capturing sub-images of said collected target entities; and
e. a computer capable of re-combining said sub-images to construct a complete image of said collected target entities.
5. The apparatus of claim 4 , in which said light source is a laser.