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Photoacoustic computed tomography system based on adjustable focusing type optical fiber sensor

A computational tomography, optical fiber sensor technology, applied in sensors, material analysis by optical means, instruments, etc., can solve the problem of the reconstruction effect of the edge part of the observed object, the limited number of sensing units in the detection array, and the difficulty in operation. and other problems, to achieve the effect of small size, simple and compact structure, and small volume

Active Publication Date: 2018-10-02
JINAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large volume of such commercial sensors, usually a few millimeters in diameter, the number of sensing units in the detection array is limited, and in the later image reconstruction, the reconstruction effect of the edge of the observed object will be affected
At the same time, in practical applications, in order to pursue larger numerical aperture and higher longitudinal resolution, this type of sensor is often designed to be in a focused state, but once it is designed, it is difficult to operate if you want to change it according to actual needs in the later stage of the experiment up

Method used

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  • Photoacoustic computed tomography system based on adjustable focusing type optical fiber sensor
  • Photoacoustic computed tomography system based on adjustable focusing type optical fiber sensor
  • Photoacoustic computed tomography system based on adjustable focusing type optical fiber sensor

Examples

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Effect test

Embodiment 1

[0028] Such as figure 1 Shown is a photoacoustic computed tomography system diagram based on an adjustable focus fiber optic sensor, including:

[0029] The short-pulse laser 1 emits laser light with a pulse frequency of F, which is reflected by the mirror 2 and expanded by the beam expander 3, and then enters the measured object 4 placed in the water tank. The measured object 4 generates ultrasonic waves due to the photoacoustic effect. Water is used as the propagation medium of the ultrasonic wave; the ultrasonic wave is received by the optical fiber sensor 6 fixed on the optical fiber holder 5 and converted into an optical signal, and the photodetector 7 connected with the optical fiber performs photoelectric signal conversion and transmits the electrical signal to Data acquisition card 8, data acquisition card 8 transmits data to computer 9. The optical fiber holder 5 is fixed on the rotating stepping motor 10, and the rotating stepping motor 10 drives the optical fiber h...

Embodiment 2

[0033] The system composition specifically includes: short pulse laser, beam expander, measured object, water tank, N groups of fiber holders, N groups of focusing fiber sensors with the same parameters, linear translation stage, photoelectric detector, data acquisition card and computer.

[0034] Further, each of the optical fiber sensors is fixed on a corresponding optical fiber holder;

[0035] The specific steps for this type of ring detection include:

[0036] Assuming that N sets of data are collected, a fiber optic sensor is set at each 360 / N degree, and the focal points of N fiber optic sensors are gathered at one point, and the measured object is placed at the focal point of the fiber optic sensor. When the laser pulse is emitted each time, each sensor at the same time collects a set of data at a certain sampling rate set by the data acquisition card. After data processing, each set of data obtains a reconstruction map of the XY plane at a position, and N sensors obta...

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Abstract

The invention discloses a photoacoustic computed tomography system based on an adjustable focusing type optical fiber sensor. The photoacoustic computed tomography system comprises a short-pulse laserdevice, a reflector, a beam expander, a water tank, a to-be-measured object, an optical fiber clamp, the adjustable focusing type optical fiber sensor, a rotary stepping motor, a photoelectric detector, a data collecting card and a computer and is characterized in that the short-pulse laser device emits short-pulse laser which irradiates the to-be-measured object, the to-be-measured object generates an ultrasonic wave due to a photoacoustic effect, the optical fiber sensor receives the ultrasonic wave and converts the same into an optical signal, the optical signal is processed by the photoelectric detector and the data collecting card and transmitted to the computer for reconstruction to obtain a two-dimensional tomography image, and a linear translation platform controls the to-be-measured object to move axially to obtain a three-dimensional tomography image. The adjustable focusing type optical fiber sensor is simple in structure, adjustable in curvature, high in sensitivity and suitable for being used in the photoacoustic computed tomography system.

Description

technical field [0001] The invention belongs to the field of photoacoustic imaging, in particular to a photoacoustic computed tomography system based on an adjustable focus optical fiber sensor. Background technique [0002] Photoacoustic imaging is a non-invasive medical imaging method that has developed rapidly in recent years. This "optical excitation, acoustic detection" imaging technology combines the characteristics of high resolution, high contrast of optical imaging and high penetration ability of acoustic imaging, providing a powerful tool for the observation of physiological and pathological processes deep in tissues. technical means. [0003] Photoacoustic Computed Tomography (PACT) is a branch of photoacoustic imaging. In PACT, the circular detection of the observed object is a main implementation method, which is suitable for whole-body imaging of some small animals, and partial joint imaging, etc. Common ultrasonic sensors at this stage are based on piezoele...

Claims

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Application Information

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IPC IPC(8): A61B5/00G01N21/17
CPCA61B5/0033A61B5/0095G01N21/1702
Inventor 金龙白雪马军梁贻智关柏鸥
Owner JINAN UNIVERSITY
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