Object information acquiring apparatus and method of controlling object information acquiring apparatus

• US 10,314,494 B2
• Filed: 10/09/2013
• Issued: 06/11/2019
• Est. Priority Date: 10/18/2012
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Sato, Akira
• Primary Examiner(s): Bui Pho, Pascal M
• Assistant Examiner(s): Sakamoto, Colin T.
• Application Number:
  US14/049,354
• Publication Number:
  US 20140114169A1
• Time in Patent Office: 2,071 Days
• CPC Class Codes: A61B 5/0095 by applying light and detecting acoustic waves, i.e. photoacoustic measurements

Abstract

An object information acquiring apparatus applying light to an object, receiving an acoustic wave generated inside the object, and acquiring information on an inside of the object on the basis of the acoustic wave comprises a light source configured to selectively emit irradiation light with at least two kinds of wavelengths; a wavelength switching unit for instructing the light source to implement switching between the wavelengths of the irradiation light; an illumination optical system guiding the irradiation light to the object; and a light irradiation limiting unit for limiting irradiation of the light to the object during a period from when the wavelength switching unit provides an instruction on wavelength switching of the light to when the light source completes the wavelength switching of the light.

Claims

1. An object information acquiring apparatus applying light to an object, receiving an acoustic wave generated inside the object, and acquiring information on an inside of the object on the basis of the acoustic wave, the object information acquiring apparatus comprising:

a light source configured to selectively emit irradiation light of at least two different wavelengths, which is applied to the object;

an acoustic wave probe to receive the acoustic wave generated inside the object;

a processing unit to acquire information on the basis of the acoustic wave;

a control unit for instructing the light source to implement switching between the wavelengths of the irradiation light;

an illumination optical system connected to the light source, and guiding the irradiation light to the object; and

a light irradiation limiting unit for limiting irradiation of the irradiation light, the light irradiation limiting unit being instructed by the control unit to limit irradiation of the irradiation light to the object during a period from when the control unit provides an instruction on wavelength switching of the irradiation light to the light source to when the light source completes the wavelength switching of the irradiation light,

wherein the light source notifies the control unit that the wavelength switching is completed, and

wherein before notification by the light source that the wavelength switching is completed, the control unit instructs the light irradiation limiting unit to limit irradiation of the irradiation light to the object.

2. The object information acquiring apparatus according to claim 1, further comprising a probe for manually scanning an object surface, wherein the irradiation light is applied to the object from the probe, and

an acoustic wave probe is incorporated in the probe and receives the acoustic wave generated inside the object.

3. The object information acquiring apparatus according to claim 1, wherein the light irradiation limiting unit limits irradiation of the irradiation light to the object by means of a light-shielding mechanism arranged on the illumination optical system.

4. The object information acquiring apparatus according to claim 3, wherein the light-shielding mechanism is a shutter configured to shield the irradiation light.

5. The object information acquiring apparatus according to claim 3, wherein the light-shielding mechanism is a filter configured to attenuate the irradiation light.

6. The object information acquiring apparatus according to claim 3, wherein the light-shielding mechanism is a diffuser panel or a diffusion lens configured to diffuse the irradiation light.

7. The object information acquiring apparatus according to claim 3, wherein the light-shielding mechanism comprises a moving mechanism to move a shielding member onto an optical path of the irradiation light.

8. The object information acquiring apparatus according to claim 1, wherein the light source generates near-infrared rays.

9. The object information acquiring apparatus according to claim 1, wherein the at least two different wavelengths selectively emitted by the irradiation light source are both wavelengths of rays in a range of 400 nm to 1600 nm.

10. The object information acquiring apparatus according to claim 9, wherein the at least two different wavelengths selectively emitted by the irradiation light source are both wavelengths of rays in a range of 700 nm to 1100 nm.

11. The object information acquiring apparatus according to claim 1, wherein the light source comprises a plurality of light sources.

12. The object information acquiring apparatus according to claim 1, wherein the light source includes an interface by which the control unit instructs the light source to implement switching between the wavelengths of the irradiation light and by which the light source notifies the control unit that the wavelength switching is completed.

13. The object information acquiring apparatus according to claim 12, wherein the light source includes a movable wavelength varying mechanism responsive to instruction by the control unit to switch between the wavelengths of the irradiation light, and wherein the light source notifies the control unit via the interface that the wavelength switching is completed based on position of the movable wavelength varying mechanism.

14. The object information acquiring apparatus according to claim 13, wherein the movable wavelength varying mechanism is selected from the group consisting of a birefringent filter and a prism.

15. The object information acquiring apparatus according to claim 1, wherein the light irradiation limiting unit includes an interface by which the light irradiation limiting unit is instructed by the control unit to limit irradiation of the irradiation light.