METHOD FOR CREATING A PIXEL IMAGE FROM SAMPLED DATA OF A SCANNED BEAM IMAGER

• US 20090245599A1
• Filed: 03/27/2008
• Published: 10/01/2009
• Est. Priority Date: 03/27/2008
• Status: Active Grant

• Current Assignee: Ethicon Endo-Surgery, Inc. (Johnson & Johnson)
• Original Assignee: Ethicon Endo-Surgery, Inc. (Johnson & Johnson)
• Inventors: Weir, Michael P.
• Granted Patent: US 8,050,520 B2
• Time in Patent Office: Days
• US Class Current: 382/128
• CPC Class Codes: A61B 1/00096 Optical elements
• CPC Class Codes: A61B 1/06 with illuminating arrangements
• CPC Class Codes: G02B 26/105 with one or more pivoting mirrors or galvano-mirrors G02B26/101 takes precedence
• CPC Class Codes: G06T 3/02 Affine transformations for image registration G06T3/147; for image mosaicing G06T3/4038

Abstract

A method for creating a pixel image in a two-dimensional display coordinate system from sampled data derived from a collector of a scanned beam imager adapted to transmit a beam of radiation which traces a trajectory in a two-dimensional acquisition coordinate system. The trajectory contains datum locations in the acquisition coordinate system associated with the sampled data. The method includes receiving the sampled data. The method also includes adjusting a mathematical model of the trajectory based on a function of at least one of rotation, translation, and desired scaling of the model of the trajectory. The method also includes constructing the pixel image in the display coordinate system from the adjusted model of the trajectory.

Claims

1. A method for creating a pixel image in a two-dimensional rectangular display coordinate system from sampled data derived from a collector of a scanned beam imager having an oscillating reflector, wherein the reflector has a surface, wherein the reflector has substantially orthogonal first and second axes of rotation, wherein the reflector oscillates in a resonant mode about the first and second axes of rotation causing a beam of radiation reflected from the surface to trace a substantially Lissajous trajectory in a two-dimensional acquisition coordinate system, wherein the Lissajous trajectory contains datum locations in the acquisition coordinate system associated with the sampled data, wherein the reflector has a third axis of rotation substantially orthogonal to the first and second axes of rotation of the reflector, and wherein the method comprises:

a) receiving the sampled data;

b) derotating a mathematical model of the Lissajous trajectory to account for rotation of the scanned beam imager about the third axis of rotation from a reference orientation;

c) constructing the pixel image in the display coordinate system from the derotated model; and

d) displaying the constructed pixel image.

2. The method of claim 1, wherein the reference orientation is a user-inputted upright viewing position.

3. The method of claim 2, also including inserting at least a portion of the scanned beam imager into a patient wherein the portion includes the reflector and the collector.

4. The method of claim 1, wherein the sampled data is sampled at a constant sampling rate.

5. The method of claim 1, wherein the rotation of the scanned beam imager from the reference orientation is derived from at least one output of at least one sensor affixed to the scanned beam imager.

6. The method of claim 1, wherein the scanned beam imager has an insertion tube which is insertable into a patient, and wherein the reflector and the collector are disposed within the insertion tube proximate a distal end of the insertion tube.

7. The method of claim 6, wherein the insertion tube when straight has a central longitudinal axis which is not substantially orthogonal to a plane defined by the first and second axes of rotation of the reflector.

8. A method for creating a pixel image in a two-dimensional display coordinate system from sampled data derived from a collector of a scanned beam imager adapted to transmit a beam of radiation which traces a trajectory in a two-dimensional acquisition coordinate system, wherein the trajectory contains datum locations in the acquisition coordinate system associated with the sampled data, wherein rotation of the scanned beam imager about an imager axis causes rotation of the trajectory in the acquisition coordinate system, and wherein the method comprises:

a) receiving the sampled data;

b) derotating a mathematical model of the trajectory to account for the rotation of the scanned beam imager about the imager axis from a reference orientation;

c) constructing the pixel image in the display coordinate system from the derotated model; and

d) performing at least one of storing the constructed pixel image in a memory and displaying the constructed pixel image.

9. The method of claim 8, wherein the reference orientation is a user-inputted viewing position.

10. The method of claim 9, also including inserting at least a portion of the scanned beam imager into a patient wherein the portion includes the collector.

11. The method of claim 8, wherein the sampled data is sampled at a constant sampling rate.

12. The method of claim 8, wherein the rotation of the scanned beam imager from the reference orientation is derived from at least one output of at least one sensor affixed to the scanned beam imager.

13. The method of claim 8, wherein the scanned beam imager has an insertion tube which is insertable into a patient, and wherein the collector is disposed within the insertion tube proximate a distal end of the insertion tube.

14. The method of claim 13, wherein the insertion tube when straight has a central longitudinal axis which is not substantially orthogonal to a plane defined by the two-dimensional acquisition coordinate system.

15. A method for creating a pixel image in a two-dimensional display coordinate system from sampled data derived from a collector of a scanned beam imager adapted to transmit a beam of radiation which traces a trajectory in a two-dimensional acquisition coordinate system, wherein the trajectory contains datum locations in the acquisition coordinate system associated with the sampled data, and wherein the method comprises:

a) receiving the sampled data;

b) adjusting a mathematical model of the trajectory based on a function of at least one of rotation, translation, and desired scaling of the model;

c) constructing the pixel image in the display coordinate system from the adjusted model; and

d) performing at least one of storing the constructed pixel image in a memory and displaying the constructed pixel image.

16. The method of claim 15, wherein the reference orientation is a user-inputted viewing position.

17. The method of claim 16, also including inserting at least a portion of the scanned beam imager into a patient wherein the portion includes the collector.

18. The method of claim 15, wherein the sampled data is sampled at a constant sampling rate.

19. The method of claim 15, wherein the scanned beam imager has an insertion tube which is insertable into a patient, and wherein the collector is disposed within the insertion tube proximate a distal end of the insertion tube.

20. The method of claim 19, wherein the insertion tube when straight has a central longitudinal axis which is not substantially orthogonal to a plane defined by the two-dimensional acquisition coordinated system.