Color image acquisition with scanning laser beam devices

• US 20090177042A1
• Filed: 01/09/2008
• Published: 07/09/2009
• Est. Priority Date: 01/09/2008
• Status: Abandoned Application

• Current Assignee: University of Washington
• Original Assignee: University of Washington
• Inventors: Johnston, Richard S.
• Application Number:
  US12/008,324
• Publication Number:
  US 20090177042A1
• Time in Patent Office: Days
• US Class Current: 600/178
• CPC Class Codes: A61B 1/00172 with means for scanning
• CPC Class Codes: A61B 1/063 for monochromatic or narrow-band illumination
• CPC Class Codes: A61B 1/0638 providing two or more wavelengths
• CPC Class Codes: A61B 1/07 using light-conductive means, e.g. optical fibres
• CPC Class Codes: A61B 5/0062 Arrangements for scanning
• CPC Class Codes: A61B 5/0084 for introduction into the body, e.g. by catheters A61B5/1459 takes precedence
• CPC Class Codes: G02B 23/2469 using optical fibres
• CPC Class Codes: G02B 23/26 using light guides for illumination G02B23/2469
• CPC Class Codes: G02B 26/103 having movable or deformable optical fibres, light guides or waveguides as scanning elements light guides per se G02B6/00

Abstract

An apparatus may include an interface to allow a scanning beam device to be coupled. The apparatus may include at least four lasers optically coupled with the interface. Each of the at least four lasers may provide a different wavelength visible spectrum light to the scanning beam device through the interface. An actuator driver of the apparatus may be electrically coupled with the interface. The actuator driver may provide actuator drive signals to the scanning beam device through the interface. The actuator drive signals may be operable to cause the scanning beam device to scan a beam of the different wavelength lights over a surface. An image generation unit of the apparatus may generate an image of the surface. The image may be generated based, at least in part, on light from the beam that has been reflected from the surface and detected by at least one photodetector.

Claims

1. An apparatus comprising:

at least four lasers, each of the at least four lasers to provide a different wavelength visible spectrum laser light;

a scanning beam device to scan a beam of the at least four different wavelength visible spectrum laser lights over a surface; and

an image generation unit to generate an image of the surface based at least in part on light from the beam that has been reflected from the surface and detected by at least one photodetector.

2. The apparatus of claim 1, wherein the at least four lasers comprise:

(a) a first red laser, a first green laser, and a first blue laser; and

(b) at least one laser selected from;

(1) a second red laser, the second red laser having a different wavelength than the first red laser;

(2) a second green laser, the second green laser having a different wavelength than the first green laser;

(3) a second blue laser, the second blue laser having a different wavelength than the first blue laser; and

(4) a laser that is not one of a red laser, a green laser, and a blue laser.

3. The apparatus of claim 1, further comprising the at least one photodetector, wherein the at least one photodetector includes a number of photodetectors that is less than a number of the at least four lasers.

4. The apparatus of claim 1, wherein the at least four lasers comprise a laser having a wavelength that is reflected by a predetermined surface of interest having a narrow spectral response band that is known in advance not to reflect any of the other lasers of the at least four lasers.

5. An apparatus comprising:

an interface to allow a scanning beam device to be coupled;

at least four lasers optically coupled with the interface, each of the at least four lasers to provide a different wavelength visible spectrum laser light to the scanning beam device through the interface;

an actuator driver electrically coupled with the interface, the actuator driver to provide actuator drive signals to the scanning beam device through the interface, the actuator drive signals operable to cause the scanning beam device to scan a beam of the different wavelength visible spectrum laser lights over a surface; and

an image generation unit to generate an image of the surface based at least in part on light from the beam that has been reflected from the surface and detected by at least one photodetector.

6. The apparatus of claim 5, wherein the at least four lasers comprise:

(a) a first red laser, a first green laser, and a first blue laser; and

(b) at least one laser selected from;

(1) a second red laser, the second red laser having a different wavelength than the first red laser;

(2) a second green laser, the second green laser having a different wavelength than the first green laser;

(3) a second blue laser, the second blue laser having a different wavelength than the first blue laser; and

(4) a laser that is not one of a red laser, a green laser, and a blue laser.

7. The apparatus of claim 5, wherein the at least four lasers comprise at least five lasers to each provide a different wavelength visible spectrum laser light.

8. The apparatus of claim 5, further comprising a light combiner coupled between the at least four lasers and the interface, the light combiner to combine the different wavelength laser lights into combined light and provide the combined light to the interface.

9. The apparatus of claim 5, further comprising the at least one photodetector, wherein the at least one photodetector is in an optical path of reflected light returned from the scanning beam device through the interface.

10. The apparatus of claim 9, wherein the at least one photodetector includes a number of photodetectors that is less than a number of the at least four lasers.

11. The apparatus of claim 10, wherein the number of photodetectors is three, and wherein the three photodetectors comprise a red photodetector, a green photodetector, and a blue photodetector.

12. The apparatus of claim 10, further comprising a light splitter optically coupled between the interface and the number of photodetectors, the light splitter to split the reflected light into different wavelength portions.

13. The apparatus of claim 5, wherein the at least four lasers comprise a laser having a wavelength that is reflected by a predetermined surface of interest having a narrow spectral response band that is known in advance not to reflect any of the other lasers of the at least four lasers.

14. The apparatus of claim 5, further comprising the scanning beam device coupled with the interface, wherein the scanning beam device comprises a scanning beam endoscope.

15. The apparatus of claim 5, further comprising the scanning beam device coupled with the interface, wherein the scanning beam device comprises a scanning fiber device having an actuator and a single cantilevered optical fiber, and wherein the actuator drive signals are operable to cause the actuator to vibrate the optical fiber within a Q-factor of its resonant frequency.

16. A method comprising:

providing at least four different wavelength visible spectrum laser lights to a scanning beam device;

providing actuator drive signals to the scanning beam device, the actuator drive signals operable to cause the scanning beam device to scan a beam of the different wavelength visible spectrum laser lights over a surface; and

generating an image of the surface based at least in part on light from the beam that has been reflected from the surface and detected.

17. The method of claim 16, wherein providing the at least four different wavelength visible spectrum laser lights comprises:

(a) providing a first red laser light, providing a first green laser light, and providing a first blue laser light; and

(b) providing at least one laser light selected from;

(1) a second red laser light, the second red laser light having a different wavelength than the first red laser light;

(2) a second green laser light, the second green laser light having a different wavelength than the first green laser light;

(3) a second blue laser light, the second blue laser light having a different wavelength than the first blue laser light; and

(4) a laser light that is not one of a red laser light, a green laser light, and a blue laser light.

18. The method of claim 16, further comprising detecting the reflected light with a number of photodetectors that is less than a number of the different wavelength laser lights.

19. A method comprising:

scanning a beam over a surface, the beam including at least four different wavelength visible spectrum laser lights;

detecting light of the beam that has been reflected from the surface at different points in time while the beam is scanned over the surface; and

generating an image of the surface based at least in part on the light detected at the different points in time.

20. The method of claim 19, wherein scanning comprises scanning a beam that comprises:

(a) a first red laser light, a first green laser light, and a first blue laser light; and

(b) at least one laser light selected from;

(1) a second red laser light having a different wavelength than the first red laser light;

(2) a second green laser light having a different wavelength than the first green laser light;

(3) a second blue laser light having a different wavelength than the first blue laser light; and

(4) a laser light that is not one of a red laser light, a green laser light, and a blue laser light.

21. The method of claim 19, wherein detecting comprises detecting the light with a number of photodetectors that is less than a number of the distinct, different wavelength visible spectrum laser lights.

22. The method of claim 19, wherein scanning the beam comprises scanning a laser light having a wavelength that is reflected by a predetermined surface of interest having a narrow spectral response band that is known in advance not to reflect any of the other lasers of the at least four lasers.

23. The method of claim 19, wherein scanning the beam comprises vibrating a single cantilevered optical fiber within a Q-factor of its resonant frequency.

24. The method of claim 19, further comprising inserting a scanning beam endoscope into a patient, and wherein scanning the beam over the surface comprises scanning the beam over a surface within the patient with the scanning beam endoscope.