# US 11,307,088 B2 · Optical tomography imaging system and imaging method for generating a reconstructed image according to plural disassembled sine waves

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- Number: US 11,307,088 B2
- Document ID: US11307088B2
- Status: Granted
- Kind: B2
- Application number: 16/698,919
- Filed: 2019-11-27
- Published: 2021-05-27
- Granted: 2022-04-19
- Earliest claimed: 2019-11-21
- Assignees: National Central University; Huan-Cheng Chang
- Applicants: National Central University; Huan-Cheng Chang
- Inventors: Min-Chun Pan; Ya-Fen Hsu; Yan-Yang Hsu
- Web page: https://patentgrep.com/patent/US11307088B2

## CPC

- G01J 1/44: Electric circuits {(for command of an exposure part G03B7/02)}
- G06T 12/00: Tomographic reconstruction from projections
- A61B 5/0073: {by tomography, i.e. reconstruction of 3D images from 2D projections (A61B5/0066 takes precedence)}
- G01J 2001/4413: {Type}
- G01J 2001/4453: {PMT}
- G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N)
- G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

An optical tomography imaging system includes a signal generator, at least one light emitter, at least one light receiver, a signal processor, and an image processor. The signal generator is configured to generate a periodic signal and a reference signal. The light emitter is configured to be activated by the periodic signal to generate an optical signal passing through an object under test. The light receiver is configured to receive and convert the optical signal passing through the object under test into an electrical signal. The signal processor is configured to generate a comparison signal according to the electrical signal and the reference signal. The image processor is configured to acquire a plurality of disassembled sine waves from the comparison signal and generate a reconstructed image according to the disassembled sine waves.

## Claims

### Claim 1

An optical tomography imaging system, comprising:
a signal generator configured to generate a periodic signal and a reference signal;
at least one light emitter configured to be activated by the periodic signal to generate an optical signal passing through an object under test;
at least one light receiver configured to receive and convert the optical signal passing through the object under test into an electrical signal;
a signal processor configured to generate a comparison signal according to the electrical signal and the reference signal; and
an image processor configured to acquire a plurality of disassembled sine waves from the comparison signal and generate a reconstructed image according to the disassembled sine waves.

### Claim 2 (depends on 1)

The optical tomography imaging system of claim 1, wherein the light receiver comprises a photomultiplier tube and an amplifier, and the electrical signal is a voltage signal.

### Claim 3 (depends on 2)

The optical tomography imaging system of claim 2, wherein the signal processor comprises a mixer configured to generate the comparison signal according to the voltage signal and the reference signal and a low-pass filter configured to remove high-frequency signals of the comparison signal.

### Claim 4 (depends on 1)

The optical tomography imaging system of claim 1, wherein the periodic signal comprises a plurality of superimposition sine waves.

### Claim 5 (depends on 1)

The optical tomography imaging system of claim 1, wherein the image processor comprises a signal capturing component configured to capture the disassembled sine waves of the comparison signal.

### Claim 6

An imaging method, comprising:
activating a light emitter by a period signal to generate an optical signal passing through an object under test;
receiving and converting the optical signal passing through an object under test into an electrical signal;
generating a comparison signal according to the electrical signal and a reference signal;
acquiring a plurality of disassembled sine waves from the comparison signal; and
generating a reconstructed image according to the disassembled sine waves.

### Claim 7 (depends on 6)

The imaging method of claim 6, wherein the electrical signal is a voltage signal.

### Claim 8 (depends on 7)

The imaging method of claim 7, further comprising:
generating the comparison signal according to the voltage signal and the reference signal; and
removing high-frequency signals of the comparison signal.

### Claim 9 (depends on 6)

The imaging method of claim 6, wherein the periodic signal comprises a plurality of superimposition sine waves.

### Claim 10 (depends on 6)

The imaging method of claim 6, further comprising:
capturing the disassembled sine waves of the comparison signal.