Photoacoustic apparatus and method for controlling the same

• US 9,675,256 B2
• Filed: 09/30/2015
• Issued: 06/13/2017
• Est. Priority Date: 12/11/2009
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Sudo, Yoshiaki, Sato, Akira
• Primary Examiner(s): SAINT SURIN, JACQUES M
• Application Number:
  US14/871,410
• Publication Number:
  US 20160015274A1
• Time in Patent Office: 622 Days
• Field of Search: 73643
• CPC Class Codes: A61B 2560/0233 Optical standards
• CPC Class Codes: A61B 2576/00 Medical imaging apparatus involving image processing or analysis A61B1/00009, A61B6/52 and A61B8/52 take precedence; image processing per se G06T; details of algorithms for analysing medical images G06T7/0012
• CPC Class Codes: A61B 5/0059 using light, e.g. diagnosis by transillumination, diascopy, fluorescence A61B5/0093, A61B5/1455, A61B5/02416 and A61B5/0261 take precedence
• CPC Class Codes: A61B 5/0095 by applying light and detecting acoustic waves, i.e. photoacoustic measurements
• CPC Class Codes: A61B 8/08 Detecting organic movements or changes, e.g. tumours, cysts, swellings A61B8/02 - A61B8/06 take precedence

Abstract

Provided is a photoacoustic apparatus capable of recognizing variation in reception characteristic among a plurality of receiving elements that detect an acoustic wave in the photoacoustic apparatus, with a simple configuration unique to the photoacoustic apparatus.

A photoacoustic apparatus includes a detecting unit including a plurality of receiving elements configured to detect an acoustic wave that is generated when an analyte is irradiated with light; a signal processing unit configured to acquire information about the inside of the analyte from a detected signal acquired from the detecting unit; an optical absorber configured to absorb the irradiation light; and a reception characteristic calculation unit configured to calculate reception characteristic information of the plurality of receiving elements on the basis of detected signals when the plurality of receiving elements receive an acoustic wave that is generated from the optical absorber.

Claims

1. A method for controlling a photoacoustic apparatus comprising the steps of:

providing a holding member;

providing a light source outside of the holding member;

providing a detecting unit including a plurality of receiving elements outside of the holding member;

providing a plurality of optical absorbers in the holding member, each being located corresponding to each of the plurality of receiving elements;

holding an analyte with the holding member configured to form an analyte region at which the analyte is held and a no-analyte region located in a remaining region other than the analyte region;

irradiating the optical absorber with light in or on the no-analyte region through the holding member without passing through the analyte;

receiving an acoustic wave generated from the optical absorbers in or on the non-analyte region with the detecting unit when the optical absorbers are irradiated thereto; and

calculating reception characteristic information of the plurality of receiving elements on the basis of detected signals of the plurality of receiving elements.

2. The method according to claim 1, further comprising calculating reception sensitivity information of the plurality of receiving element.

3. The method according to claim 2, further comprising a step of correcting a reception signal received by the plurality of receiving elements based on the reception sensitivity information of the plurality of receiving elements calculated in the step of calculating.

4. The method according to claim 3, wherein the reception signal is multiplied by a reciprocal of the calculated reception sensitivity information in the step of correcting a reception signal received by the plurality of receiving elements.

5. The method according to claim 1, further comprising calculating a frequency characteristic information of the plurality of receiving elements.

6. The method according to claim 5, further comprising a step of correcting the reception signal received by the plurality of receiving elements based on the frequency characteristic information of the plurality of receiving elements calculated in the step of calculating.

7. The method according to claim 1, further comprising irradiating the optical absorber with light that has propagated through an uncompressed region of the holding member corresponding to a rest of a compressed region of the holding member.

8. The method according to claim 1, further comprising arranging each of the plurality of optical absorbers located at a center of the corresponding one of the receiving elements.

9. A photoacoustic apparatus comprising:

a holding member configured to hold an analyte;

a light source configured to irradiate light to the analyte transmitting through the holding member and located in opposition to the analyte with respect to the holding member;

a detecting unit configured to detect acoustic wave through the holding member and located in opposition to the analyte with respect to the holding member;

a plurality of optical absorbers disposed in or on the holding member;

a signal processing unit configured to acquire information of the analyte from a detected signal of the acoustic wave from the detecting unit; and

a reception characteristic calculation unit configured to calculate reception information based on the detected signal,

wherein the holding member has a larger area than the analyte in a holding state and the holding member includes a holding region and an unholding region outside of the unholding region, and

wherein the plurality of optical absorbers are located in the unholding region and are not located in the holding region.