Systems and methods for imaging large field-of-view objects

• US 9,724,058 B2
• Filed: 07/25/2016
• Issued: 08/08/2017
• Est. Priority Date: 03/19/2002
• Status: Expired

• Current Assignee: Medtronic Navigation Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Navigation Incorporated (Medtronic Plc)
• Inventors: Grant, Richard K., Johnson, Norbert, Gregerson, Eugene A.
• Primary Examiner(s): SONG, HOON K
• Application Number:
  US15/218,407
• Publication Number:
  US 20160331335A1
• Time in Patent Office: 379 Days
• CPC Class Codes: A61B 6/032 Transmission computed tomography [CT]
• CPC Class Codes: A61B 6/06 Diaphragms
• CPC Class Codes: A61B 6/4021 involving movement of the focal spot
• CPC Class Codes: A61B 6/4085 Cone-beams
• CPC Class Codes: A61B 6/4233 using matrix detectors
• CPC Class Codes: A61B 6/4405 the apparatus being movable or portable, e.g. handheld or mounted on a trolley
• CPC Class Codes: A61B 6/4452 the source unit and the detector unit being able to move relative to each other
• CPC Class Codes: G01N 2223/419 computed tomograph
• CPC Class Codes: G01N 23/043 using fluoroscopic examination, with visual observation or video transmission of fluoroscopic images
• CPC Class Codes: G01N 23/046 using tomography, e.g. computed tomography [CT]

Abstract

An imaging apparatus and related method comprising a detector located a distance from a source and positioned to receive a beam of radiation in a trajectory; a detector positioner that translates the detector to an alternate position in a direction that is substantially normal to the trajectory; and a beam positioner that alters the trajectory of the radiation beam to direct the beam onto the detector located at the alternate position.

Claims

1. A method of operating an image apparatus, comprising:

positioning a detector to image at least a portion of a volume configured to hold an object larger than a field-of-view of the detector;

utilizing a detector positioner to translate the detector to multiple positions relative to the volume;

positioning a beam such that a trajectory of the beam follows the path of the translating detector; and

moving a rotor within a gantry such that the beam follows the path of the translating detector;

wherein the detector and a beam source that emits the beam are movably mounted to the rotor.

4. The method of claim 1, further comprising moving separately all of the beam source, the detector, and the rotor while obtaining images of the object.

5. The method of claim 1, further comprising rotating the rotor within an interior cavity of the gantry over a 360°

circumference of the gantry.

6. The method of claim 1, further comprising moving a source housing within a source stage to move the source housing about a central point to direct the beam onto the detector.

7. The method of claim 1, wherein the beam is projected by the beam source, and the trajectory of the beam is altered by tilting the beam source.

8. The method of claim 1, wherein translating the detector further includes translating the detector along an arc.

9. The method of claim 1, wherein translating the detector further includes translating the detector along a line.

2. A method of operating an image apparatus, comprising:

positioning a detector to image at least a portion of a volume configured to hold an object larger than a field-of-view of the detector;

utilizing a detector positioner to translate the detector to multiple positions relative to the volume;

positioning a beam such that a trajectory of the beam follows the path of the translating detector; and

driving a beam source with a motor to pivotally move the beam source on a swiveling source mount;

wherein the beam source is mounted to a source frame having at least two separated walls and a series of lateral members extending between the at least two separated walls and the swiveling source mount to pivotally hold the source relative to the source frame.

3. A method of operating an image apparatus, comprising:

positioning a detector to image at least a portion of a volume configured to hold an object larger than a field-of-view of the detector;

utilizing a detector positioner to translate the detector to multiple positions relative to the volume;

positioning a beam such that a trajectory of the beam follows the path of the translating detector; and

moving a detector carriage relative to a detector frame having at least two separated walls and a series of lateral members extending between the at least two separated walls;

wherein the detector is mounted to the detector carriage to hold the detector.

10. A method of operating an image apparatus, comprising:

positioning a detector to image at least a portion of a volume configured to hold an object larger than a field-of-view of the detector, including;

positioning the detector at a first position within a gantry to image a first portion of the object;

positioning a beam such that the beam is detected by the detector at the first position;

moving the detector to a second position within the gantry to image the first portion of the object;

moving the beam such that the beam is detected by the detector at the second position; and

moving a rotor within the gantry from a first angle to a second angle;

wherein both of the detector and a beam source that emits the beam are moveably mounted to the rotor.

11. The method of claim 10, further comprising:

moving all of the beam source, the detector, and the rotor to minimize exposure of the object to radiation while obtaining images of the object.

12. The method of claim 10, further comprising:

moving separately all of the beam source, the detector, and the rotor while obtaining images of the object.

13. The method of claim 10, wherein moving the detector to the second position within the gantry includes moving the detector along an arc.

14. The method of claim 10, wherein moving the detector to the second position within the gantry includes moving the detector along a line.

15. A method of operating an imaging apparatus, comprising:

positioning an object within an O-shaped gantry;

rotating a rotor carrying a source and a detector within an interior cavity of the gantry about the object;

positioning the detector to image a portion of the object that is larger than a field-of-view of the detector;

translating the detector to multiple positions relative to the object; and

positioning a beam from the source such that a trajectory of the beam follows the path of the translating detector.

16. The method of claim 15, further comprising utilizing a detector positioner to translate the detector to the multiple positions.

17. The method of claim 15, wherein the detector is translated along one of an arc or along a line.

18. The method of claim 15, further comprising tilting the source at a focal point to change the trajectory of the beam to follow the path of the translating detector.