# US 12,222,345 B2 · System for imaging captured cells

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- Number: US 12,222,345 B2
- Document ID: US12222345B2
- Status: Granted
- Kind: B2
- Application number: 15/931,928
- Filed: 2020-05-14
- Published: 2020-08-27
- Granted: 2025-02-11
- Earliest claimed: 2013-03-13
- Assignees: Bio-Rad Laboratories, Inc.
- Applicants: Bio-Rad Laboratories, Inc.
- Inventors: Kalyan Handique; Kyle Gleason; Christopher Siemer; Priyadarshini Gogoi; Saedeh Sepehri Javdani; Gene Parunak; Aaron Kehrer; Jon Meines
- Web page: https://patentgrep.com/patent/US12222345B2

## CPC

- G01N 33/4833: {of solid biological material, e.g. tissue samples, cell cultures (tissue in vivo A61B5/00; cell suspensions G01N33/48735)}
- G01N 21/253: {for batch operation, i.e. multisample apparatus (analytical automats G01N35/00)}
- G01N 21/6428: {Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes" (in vivo A61B5/00; immunoassay G01N33/53)}
- G01N 21/6458: {Fluorescence microscopy (fluorescence microscopes per se G02B21/0076 and G02B21/16)}
- G01N 21/6486: {Measuring fluorescence of biological material, e.g. DNA, RNA, cells (G01N21/6428 takes precedence)}
- G01N 21/76: Chemiluminescence; Bioluminescence
- G01N 33/48735: {Investigating suspensions of cells, e.g. measuring microbe concentration (by chemical means C12Q1/04; colony counters C12M1/34; concentration of particle suspensions in general G01N15/06)}
- G02B 21/06: Means for illuminating specimens
- G02B 21/26: Stages; Adjusting means therefor
- A61B 5/00: Measuring for diagnostic purposes (radiation diagnosis A61B6/00; diagnosis by ultrasonic, sonic or infrasonic waves A61B8/00); Identification of persons
- G01N 2021/6439: {with indicators, stains, dyes, tags, labels, marks}
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

A system for imaging captured cells comprising: an illumination module configured to illuminate a target object; a platform configured to position the target object in relation to the illumination module; a filter module configured to filter light transmitted to the target object and/or to filter light received from the target object, an optical sensor configured to receive light from the target object and to generate image data; and a focusing and optics module configured to manipulate light transmitted to the optical sensor. The system can further comprise one or more of: a control system configured to control at least one of the illumination module, the platform, the focusing and optics module, the filter module, and the optical sensor; a tag identifying system configured to identify and communicate tag information from system elements; a thermal control module configured to adjust temperature parameters of the system; and an image stabilization module.

## Claims

### Claim 1

A method comprising:
receiving an imaging substrate at a platform positioned between: a first light source configured to transmit light toward the imaging substrate from a first direction and a second light source configured to transmit light toward the imaging substrate from a second direction different from the first direction; and
generating an image dataset from the imaging substrate, by way of a lens actuator coupled to a lens configured to transmit light from a target object toward an optical sensor, the target object comprising a tag having one or more features coupled to the imaging substrate, wherein the tag is defined at a surface of the imaging substrate and,
wherein generating the image dataset comprises:
actuating the platform relative to a first axis perpendicular to a plane defined by the platform, into a first configuration that aligns the imaging substrate into alignment with the first light source, the second light source, and the lens, and
adjusting operation of the lens actuator, thereby automatically focusing the lens relative to the target object by way of the tag.

### Claim 2 (depends on 1)

The method of claim 1, wherein the tag encodes an address associated with a region of the imaging substrate, the method further comprising detecting the tag and extracting the address.

### Claim 3 (depends on 1)

The method of claim 1, wherein the tag comprises an arrangement of characters, and the one or more features of the tag comprises at least one of: a relative distance between characters of the arrangement of characters, a character color, a character intensity, and a character shape.

### Claim 4 (depends on 1)

The method of claim 1, wherein the tag comprises one or more non-visible spectrum features.

### Claim 5 (depends on 1)

The method of claim 1, wherein the tag comprises a fiducial with one or more depth features coupled to the imaging substrate, the method further comprising autofocusing the lens relative to a sample component retained at the imaging substrate based upon focusing relative to the fiducial.

### Claim 6 (depends on 1)

The method of claim 1, wherein the imaging substrate comprises a set of tags, including the tag, distributed across the imaging substrate proximal a sample-containing region of the imaging substrate, wherein each of the set of tags encodes a unique address associated with a portion of the sample-containing region.

### Claim 7 (depends on 1)

The method of claim 1, wherein the imaging substrate comprises an inlet, one or more outlets, and a set of chambers in fluid communication with the inlet and the outlet, the set of chambers configured to receive a set of target particles of a sample at the inlet and capture target particles at the set of chambers in single-particle format.

### Claim 8 (depends on 7)

The method of claim 7, wherein the imaging substrate comprises a set of tags, including the tag, distributed across the imaging substrate proximal the set of chambers, wherein each of the set of tags encodes a unique address associated with a subset of the set of chambers and comprises one or more features for focusing an imaging system relative to the set of chambers.

### Claim 9 (depends on 1)

The method of claim 1, wherein generating the image dataset comprises transmitting light through an excitation filter of a filter subsystem, toward the imaging substrate, and transmitting light from the imaging substrate through an emission filter of the filter subsystem, toward the optical sensor.

### Claim 10 (depends on 9)

The method of claim 9, wherein generating the image dataset further comprises rotating the filter subsystem about a second axis, into a second configuration that positions at least one of the excitation filter and the emission filter of the filter subsystem into alignment with at least one of the first light source and the second light source.

### Claim 11 (depends on 9)

The method of claim 9, further comprising exciting contents of the imaging substrate and filtering emitted light from contents of the imaging substrate with a set of excitation filters and a set of emission filters of the filter subsystem, comprising filters for at least one of: HEX-based assays, FAM-based assays, ROX-based assays, and Cy5-based assays.

### Claim 12 (depends on 1)

The method of claim 1, wherein generating the image dataset further comprises tilting the platform, thereby generating a distribution of focal lengths across the platform relative to the lens, and performing a calibration operation, based upon a focal length of the distribution of focal lengths that provides a desired contrast level.

### Claim 13 (depends on 1)

The method of claim 1, further comprising adjusting thermal parameters of at least one of the imaging substrate and a sample retained at the imaging substrate, with a thermal control subsystem in thermal communication with the imaging substrate at the platform.

### Claim 14 (depends on 1)

The method of claim 1, wherein the lens actuator comprises a lens selector and a translation stage coupled to an optical shaft concentrically aligned with the lens by way of the lens selector, the method further comprising vertically translating the lens to facilitate autofocusing of the target object.