# US 12,213,797 B2 · Apparatus for multimodal analysis of allergic reactions in skin tests and a hybrid method for multispectral imaging of allergic reactions in skin tests and its use for automatic evaluation of the results of these tests

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- Number: US 12,213,797 B2
- Document ID: US12213797B2
- Status: Granted
- Kind: B2
- Application number: 17/047,768
- Filed: 2019-04-23
- Published: 2021-06-10
- Granted: 2025-02-04
- Earliest claimed: 2018-04-30
- Assignees: Milton Essex SA
- Applicants: Milton Essex SA
- Inventors: Jacek Stepien; Radoslaw Solan; Pawel Lukasiewicz
- Web page: https://patentgrep.com/patent/US12213797B2

## CPC

- A61B 5/411: {Detecting or monitoring allergy or intolerance reactions to an allergenic agent or substance}
- A61B 5/0064: {Body surface scanning}
- A61B 5/0077: {Devices for viewing the surface of the body, e.g. camera, magnifying lens}
- A61B 5/015: {By temperature mapping of body part}
- A61B 5/0261: {using optical means, e.g. infrared light}
- A61B 5/445: {Evaluating skin irritation or skin trauma, e.g. rash, eczema, wound, bed sore}
- A61B 2560/0223: of calibration, e.g. protocols for calibrating sensors
- A61B 2560/0406: specially shaped apparatus housings
- G01B 11/2518: {Projection by scanning of the object}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS

## Abstract

A multimodal apparatus for analysis of allergic reactions during skin tests and a method of multispectral imaging of allergic reactions in case of the type I and the type IV allergic reactions induced by performing skin allergy Prick and Patch tests combine thermal imaging with Laser Doppler flowmetry or 3D scanning to confirm the results of epidermal hyperthermia tests.

## Claims

### Claim 1

A method for imaging allergic skin reactions during a Prick test or Patch test applied to a tested area of a patient's skin, comprising:
in the case that a Prick test is applied, recording a hyperthermic component of an allergic Type I reaction occurring at the tested area using a thermal imaging camera and also performing transdermal laser Doppler flowmetry at the tested area;
in the case that a Patch test is applied, recording a hyperthermic component of an allergic Type IV reaction occurring at the tested area by using a thermal imaging camera and also recording an optical component reflecting a topography of the tested area with identification of surface skin lesions via optical reflectometry using a 3D scanner, and
based on thermal imaging obtained either by the transdermal laser Doppler flowmetry or the optical reflectometry, developing an indication of the allergic reaction of the tested area.

### Claim 2 (depends on 1)

The method according to claim 1 performed with the use of a multimodal apparatus, wherein the multimodal apparatus comprises:
a hybrid structure, combining, in an open-ended housing:
a recording system containing the infrared thermal imaging camera operating in the electromagnetic wavelength range from 760 nm to 100 μm,
a stationary camera with a CCD or CMOS photosensitive matrix, operating in a visible light spectrum within an electromagnetic wavelength range from 380 nm to 780 nm,
a rotating tube comprising:
the 3D scanner,
a Doppler sensor for performing transdermal laser Doppler flowmetry,
a heating and cooling system,
a calibration system in form of a stabilized heating black body and a spacer comprising a ring or prism releasably connected to a lower part of the housing, the spacer defining an enclosed space between the housing and the tested area, which is defined by a hole in the lower part of the spacer, the stationary camera, the thermal imaging camera and the Doppler sensor being mounted in the housing above the test area, a lower part of the housing containing the thermal imaging camera, the stationary camera and the Doppler sensor and a stepper motor for driving the rotating tube, the rotating tube being open from both a top and a bottom,
the 3D scanner comprising a pattern projector with an LED light source, a vertical pattern projection grid and a recorder equipped with a full-spectral digital camera operating in wavelength range from 300 nm to 1000 nm,
whereby both the pattern projector and the recorder are mounted in one plane, inclined with respect to the lower opening of the rotating tube, and the rotating tube itself is arranged on a circular frame allowing circular motions in a plane perpendicular to an optical axis of the thermal imaging camera.

### Claim 3 (depends on 2)

The method according to claim 2, further including the step of digitally applying an image of isotherm distribution of the tested area from the thermal imaging camera to a visible light image of the same tested area registered by the stationary camera.

### Claim 4 (depends on 1)

The method according to claim 1, further including the step of applying onto the tested area a template determining a topography of points of application of at least one test substance before the tested area is exposed to at least one test substance is applied.