Photoacustic measuring apparatus

A measurement device, sound wave technology, applied in the direction of measurement device, diagnostic recording/measurement, radio wave measurement system, etc., can solve the problem of image resolution reduction and other problems

Active Publication Date: 2012-07-18
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when performing ordinary image reconstruction processing that assumes a constant speed of sound, the resolution of the image decreases

Method used

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Examples

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no. 1 example

[0031] will refer to Figure 1A with Figure 1B A first embodiment of the present invention is described. Figure 1A is a schematic diagram showing an example of a measuring device to which the present invention is applicable. Figure 1B is an enlarged schematic diagram showing the structure of a detector and a shape maintaining member for explaining a virtual detection region. In this embodiment, a PAT apparatus utilizing photoacoustic tomography is described as an example. The PAT device generates image data by receiving sound waves generated in the subject when the subject is irradiated with light pulses.

[0032] The PAT device according to the present embodiment includes a light source 11 , an optical assembly 13 , a pressure plate 15 serving as a shape maintaining member, a detector 18 , and a processing unit 70 . Image data is generated by the processing unit 70 and displayed by the display device 21. The processing unit 70 includes a signal processor 19 and an ima...

no. 2 example

[0061] In the second embodiment, as Figure 4 As shown, a filter 47 having an opening 51 is provided on the shape maintaining member 48 . The second embodiment differs from the first embodiment in that the opening 51 defines a virtual detection area 46 and the element is divided into a plurality of receiving surfaces.

[0062] Such as Figure 4 As shown, a filter 47 having a physical opening 51 and made of a material that reflects or absorbs reflected ultrasound waves is disposed on the shape maintaining member 48 . Acoustic waves passing through opening 51 are received by element 52 . The element 52 is divided into a plurality of receiving surfaces 49 . The sound waves are received by the receiving surface and converted into a plurality of electric signals (detection signals) 50 . Then, the processing unit performs delay processing based on the distances a1 to a5 from the opening to the respective receiving surfaces and adds the respective detection signals 50 . Delay pr...

no. 3 example

[0067] In the first and second embodiments, a PAT apparatus using photoacoustic tomography that receives acoustic waves generated in a subject in response to irradiation of light to the subject is described in detail. However, the same principle is also applicable to a measurement device (ultrasonic device) that generates image data by transmitting sound waves (typically ultrasonic waves) from a probe and receiving sound waves reflected in a subject. In this case, similarly to the first and second embodiments, a virtual detection area can be used in reception. In addition, also in the process of transmitting the acoustic wave, a virtual detection area may be used as a virtual transmission area. The above-mentioned virtual detection area is directly used as a virtual transmission area, and ultrasonic waves can be transmitted as if it were transmitted from the virtual transmission area (virtual detection area). As a result, in the transmitted sound wave, disturbance in the wave...

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Abstract

A measuring apparatus includes a shape maintaining member that maintains a shape of at least a part of a subject, an element that receives an acoustic wave through the shape maintaining member and converts the acoustic wave into a first electric signal, the acoustic wave being generated in the subject when the subject is irradiated with light, and a processing unit that generates image data using the first electric signal. The processing unit determines, on the basis of the first electric signal, a first time from when the acoustic wave is generated in the subject to when the acoustic wave reaches a reception surface of the element. The processing unit converts the first electric signal into a second electric signal using a difference between the first time and a second time in which the acoustic wave travels from a virtual detection region set near a subject-side surface of the shape maintaining member to the reception surface of the element, the second electric signal being assumed to have been obtained by receiving the acoustic wave at the virtual detection region.

Description

technical field [0001] The invention relates to measuring devices. More particularly, the present invention relates to a measurement device that receives acoustic waves propagating within a subject and generates image data. Background technique [0002] In the medical field, research on a measurement device that generates image data based on information about the inside of a subject by irradiating a subject such as a living body with light emitted from a light source such as a laser has been actively conducted. A photoacoustic tomography (PAT) device is an example of such a measuring device. In photoacoustic tomography, a subject is irradiated with light emitted from a light source so that the light propagates and diffuses in the subject. Biological tissue in the subject absorbs the energy of the light and generates sound waves (typically ultrasonic waves). Ultrasonic waves are received by detectors to obtain electrical signals. The electrical signal is mathematically an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/00A61B8/00A61B8/08G01N21/17G01S15/02G01S15/89G10K11/00
CPCA61B8/0825G01N21/1702G01S7/52049A61B5/0095A61B5/0091A61B5/4312
Inventor 福谷和彦小林秀一
Owner CANON KK
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