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Photoacoustic apparatus

A technology of light source and light irradiation, which is applied in the fields of medical science, instrumentation, diagnosis using tomography, etc., and can solve the problem of low precision

Active Publication Date: 2016-06-08
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, when the subject information of the target region is acquired by the photoacoustic device, the accuracy of the subject information may be low in a region where the amount of blood is small

Method used

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Examples

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no. 1 example

[0021] The photoacoustic device according to the present embodiment is a device that acquires subject information from a reception signal of a photoacoustic wave. The subject information according to the present embodiment is information on the subject obtained from reception signals of photoacoustic waves generated by the photoacoustic effect. Specifically, the subject information includes, for example, generated sound pressure (initial sound pressure), optical energy absorption density, optical absorption coefficient, and concentration of substances constituting a certain tissue. Here, the concentration of the substance includes, for example, oxygen saturation, oxyhemoglobin concentration, reduced hemoglobin concentration, and total hemoglobin concentration. The total hemoglobin concentration is the sum of the oxygenated hemoglobin concentration and the reduced hemoglobin concentration. In addition, distribution data such as optical absorption coefficient distribution and o...

no. 2 example

[0108] Next, a subject information acquisition method according to a second embodiment using a photoacoustic device similar to that in the first embodiment will be described.

[0109] The state of muscle contraction caused by electrical stimulation changes according to the application time or non-application time, so it is considered that the manner in which the amount of blood changes to the target area changes when the application time or non-application time changes. In addition, for example, the elasticity and structure of blood vessels differ from subject to subject, so it is considered that the manner in which the amount of blood changes with respect to a change in application time or non-application time varies from subject to subject different. Therefore, it is considered that the application time or non-application time at which subject information can be acquired with high accuracy differs from subject to subject due to individual differences among subjects.

[0110...

no. 3 example

[0129] Next, a subject information acquisition method according to a third embodiment using a photoacoustic device similar to that in the first or second embodiment will be described.

[0130] As described above, it is considered that the application time t1 or the non-application time t3 at which subject information can be acquired with high precision differs from subject to subject due to individual differences among subjects.

[0131] Therefore, the present embodiment is different from the first embodiment or the second embodiment in that the processing unit 190 changes the application time t1 or the non-application time t3 according to the acquired image data of the subject information. Hereinafter, configurations or steps similar to those in the first embodiment or the second embodiment are denoted by the same reference numerals, and detailed descriptions thereof will be omitted.

[0132] Figure 7 A flowchart for acquiring subject information according to the third embo...

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Abstract

A photoacoustic apparatus according to the present invention includes an electrical stimulation unit configured to apply a voltage to a subject, and a processing unit configured to set a light irradiation timing such that the subject is irradiated with pulsed light at least once in a period from an irradiation start timing determined in accordance with an application start timing of the voltage to when a first time period starting from the application start timing and ending at an application end timing of the voltage passes, and to set the light irradiation timing such that the subject is not irradiated with pulsed light outside the period from the irradiation start timing to when the first time period passes.

Description

technical field [0001] The present invention relates to a photoacoustic device utilizing the photoacoustic effect. Background technique [0002] One of imaging techniques using light is a photoacoustic imaging technique. In photoacoustic imaging, first, a subject is irradiated with pulsed light generated from a light source. Irradiation light propagates and diffuses through the subject and is absorbed at multiple positions within the subject, thereby generating photoacoustic waves. The transducer converts the photoacoustic wave into an electric signal, and the processing device acquires information on optical property values ​​inside the object by performing analysis processing on the electric signal. [0003] The sound pressure P generated by the photoacoustic wave generated from the light absorber in the subject 0 (hereinafter, also referred to as initial sound pressure) can be expressed by the following expression. [0004] P 0 =Γ·μ a ·Φ......(1) [0005] Here, Γ r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/00A61B5/1455
CPCA61B5/0073A61B5/0095A61B5/7475A61B2576/00G16H30/40
Inventor 大古场稔冈一仁
Owner CANON KK