Radiation camera system and method

• US 9,547,093 B2
• Filed: 11/19/2014
• Issued: 01/17/2017
• Est. Priority Date: 05/26/2014
• Status: Active Grant

• Current Assignee: Mirion Technologies Incorporated (American Capital Limited)
• Original Assignee: Canberra France SAS (American Capital Limited)
• Inventors: De Toro, Daniel, Abou-Khalil, Roger, Talent, Philippe, Bonnet, Florent, Patoz, Audrey, Duloisy, Christian, Amgarou, Khalil, Menaa, Nabil
• Primary Examiner(s): Porta, David
• Assistant Examiner(s): Faye, Mamadou
• Application Number:
  US14/547,990
• Publication Number:
  US 20150338533A1
• Time in Patent Office: 790 Days
• US Class Current: 1/1
• CPC Class Codes: G01T 1/2978 Hybrid imaging systems, e.g. using a position sensitive detector (camera) to determine the distribution in one direction and using mechanical movement of the detector or the subject in the other direction or using a camera to determine the distribution in two dimensions and using movement of the camera or the subject to increase the field of view G01T1/2985 takes precedence
• CPC Class Codes: G01T 7/00 Details of radiation-measuring instruments
• CPC Class Codes: H04N 23/00 Cameras or camera modules comprising electronic image sensors; Control thereof

Abstract

A radiation camera system and method incorporating a radiation sensor/detector (RSD) and automated operation of coded camera aperture masks (CAMs) is disclosed that may be advantageously applied to real-time tracking of radiological hot spots in crisis, maintenance, decontamination, and/or maintenance scenarios. The system/method integrates automated camera RSD positioning, CAM identification, and CAM rotation. The system incorporates computerized controls in conjunction with remotely controlled horizontal/vertical tilting motors to direct the RSD aperture position and view of the RSD. CAMs may be installed in the camera manually and are automatically identified by the system via the use of encoding magnets that are detected using a Hall-effect sensor. The CAMs may be rotated after installation in the camera by computer control to predefined positions such as “mask” and “anti-mask” to affect the desired degree of radiation screening to be applied to the RSD.

Claims

1. A radiation camera system comprising:

(a) radiation sensor/detector (RSD);

(b) coded camera aperture mask (CAM);

(c) CAM ID reader (CIR);

(d) mask rotation motor (MRM);

(e) rotation detection sensor (RDS);

(f) radiation camera enclosure (RCE); and

(g) computing control device (CCD);

wherein;

said RCE is configured to mechanically couple said RSD, said CAM, said MRM, said RDS, and said CCD;

said CAM is configured to cover said RSD and collimate radiation external to said RCE that is presented to said RSD;

said MRM is configured to rotate said CAM under direction of said CCD;

said CAM further comprises coded identification indicia (CII);

said CII encodes a unique CAM identification and aperture mask type being applied to said RSD via said CAM;

said CIR is configured to read said CII and transmit said unique CAM identification said aperture mask type to said CCD;

said CAM further comprises a plurality of rotation indicia (PRI) that identify the current rotation angle of said CAM;

said plurality of rotation indicia (PRI) are configured to provide a clock with time intervals configured to detect the presence or absence of said CII when said CAM is rotated;

said RDS is configured to detect said plurality of rotation indicia (PRI);

said CCD is configured to capture detected radiation data from said RSD and transmit said detected radiation data via a digital communications medium (DCM) to a host computer system (HCS);

said CCD is configured to receive rotation commands from said HCS via said DCM and activate said MRM in response to said rotation commands; and

said CCD is configured to capture rotation data from said RDS and transmit said rotation data via said DCM to said HCS.

2. The radiation camera system of claim 1 wherein said system further comprises a horizontal panning motor (HPM) controlled by said CCD and configured to enable horizontal panning of said RCE.

3. The radiation camera system of claim 1 wherein said system further comprises a vertical tilting motor (VTM) controlled by said CCD and configured to enable vertical tilting of said RCE.

4. The radiation camera system of claim 1 wherein said RDS comprises an optical sensor.

5. The radiation camera system of claim 3, wherein said DCM is selected from a group consisting of:

hardwired digital communication link; and

wireless digital communication link.

6. The radiation camera system of claim 1 wherein said CII comprises a series of magnets impregnated within a modular plastic holder (MPH) that retains said CAM.

7. The radiation camera system of claim 1 wherein said CCD is configured to read CAM identification data from a sensor operable to interpret said CII and further configured to transmit said CAM identification information to said HCS.

8. The radiation camera system of claim 1 wherein said rotation commands comprise commands to rotationally position said CAM in orthogonal “

mask” and

“

anti-mask”

positions.

9. The radiation camera system of claim 1 wherein said RSD comprises a gamma radiation detector.

10. The radiation camera system of claim 1 wherein said CAM is selected from a group consisting of:

aperture mask with rank 13 and 2 mm thickness;

aperture mask with rank 7 and 4 mm thickness; and

aperture mask with rank 7 and 8 mm thickness.

11. The radiation camera system of claim 1 wherein said system further comprises an imaging camera configured to automatically frame and take unobstructed pictures of the visual camera field-of-view scene images associated with said RSD and communicate said field-of-view scene images to said CCD.

12. The radiation camera system of claim 1 wherein said system further comprises a stroboscopic flash controlled by said CCD that is configured to illuminate the field-of-view of said RSD.

13. The radiation camera system of claim 1 wherein said CAM is automatically rotated under control of said CCD based on a mask/anti-mask time period automatically calculated by said HCS based on source radiation and background radiation measurements retrieved by said CCD from said RSD.

14. The radiation camera system of claim 1 wherein said RSD further comprises a shutter frame time control that is automatically adjusted by said HCS based on source radiation and background radiation measurements retrieved by said CCD from said RSD.

15. The radiation camera system of claim 1 wherein said CCD maintains historical data of radiation images on a frame-by-frame basis as retrieved from said RSD.

16. The radiation camera system of claim 1 wherein said system further comprises a laser telemeter configured to measure the distance between said RSD and a radiation source and transmit said distance measurement to said CCD wherein said CCD is configured to determine a dose rate estimate associated with exposure to said radiation source using said transmitted distance measurement.

17. The radiation camera system of claim 1 wherein said system further comprises an external radiation dose rate meter configured to capture data on and directly measure radiation dosing external to said RSD and communicate said data to said CCD.

18. The radiation camera system of claim 1 wherein said system further comprises a 3-axis accelerometer configured to capture data on movement of said RSD and transmit said data to said CCD.

19. The radiation camera system of claim 1 wherein said system further comprises a 3-axis magnetometer configured to capture data on the axial position of said RSD with respect to terrestrial magnetic North and transmit said data to said CCD.

20. The radiation camera system of claim 1 wherein said system further comprises a temperature sensor configured to capture data on the temperature of said RSD and transmit said data to said CCD.

21. A radiation camera method, said method operating in conjunction with a radiation camera system comprising:

(a) radiation sensor/detector (RSD);

(b) coded camera aperture mask (CAM);

(c) CAM ID reader (CIR);

(d) mask rotation motor (MRM);

(e) rotation detection sensor (RDS);

(f) radiation camera enclosure (RCE); and

(g) computing control device (CCD);

wherein;

said RCE is configured to mechanically couple said RSD, said CAM, said MRM, said RDS, and said CCD;

said CAM is configured to cover said RSD and collimate radiation external to said RCE that is presented to said RSD;

said MRM is configured to rotate said CAM under direction of said CCD;

said CAM further comprises coded identification indicia (CII);

said CII encodes a unique CAM identification and aperture mask type being applied to said RSD via said CAM;

said CIR is configured to read said CII and transmit said unique CAM identification said aperture mask type to said CCD;

said CAM further comprises a plurality of rotation indicia (PRI) that identify the current rotation angle of said CAM;

said plurality of rotation indicia (PRI) are configured to provide a clock with time intervals configured to detect the presence or absence of said CII when said CAM is rotated;

said RDS is configured to detect said plurality of rotation indicia (PRI);

said CCD is configured to capture detected radiation data from said RSD and transmit said detected radiation data via a digital communications medium (DCM) to a host computer system (HCS);

said CCD is configured to receive rotation commands from said HCS via said DCM and activate said MRM in response to said rotation commands; and

said CCD is configured to capture rotation data from said RDS and transmit said rotation data via said DCM to said HCS;

wherein said method comprises the steps of;

(1) rotating said CAM with said MRM under direction of said CCD;

(2) capturing detected radiation data from said RSD with said CCD and transmitting said detected radiation data via said DCM to said HCS;

(3) detecting said rotation indicia on said CAM with said RDS;

(4) receiving rotation commands with said CCD from said HCS via said DCM and activating said MRM in response to said rotation commands; and

(5) capturing rotation data with said CCD from said RDS and transmitting said rotation data via said DCM to said HCS.

22. The radiation camera method of claim 21 wherein said system further comprises a horizontal panning motor (HPM) controlled by said CCD and configured to enable horizontal panning of said RCE.

23. The radiation camera method of claim 21 wherein said system further comprises a vertical tilting motor (VTM) controlled by said CCD and configured to enable vertical tilting of said RCE.

24. The radiation camera method of claim 21 wherein said RDS comprises an optical sensor.

25. The radiation camera method of claim 21 wherein said DCM is selected from a group consisting of:

hardwired digital communication link; and

wireless digital communication link.

26. The radiation camera method of claim 21 wherein said CII comprises a series of magnets impregnated within a modular plastic holder (MPH) that retains said CAM.

27. The radiation camera method of claim 21 wherein said CCD is configured to read CAM identification data from a sensor operable to interpret said CII and further configured to transmit said CAM identification information to said HCS.

28. The radiation camera method of claim 21 wherein said rotation commands comprise commands to rotationally position said CAM in orthogonal “

mask” and

“

anti-mask”

positions.

29. The radiation camera method of claim 21 wherein said RSD comprises a gamma radiation detector.

30. The radiation camera method of claim 21 wherein said CAM is selected from a group consisting of:

aperture mask with rank 13 and 2 mm thickness;

aperture mask with rank 7 and 4 mm thickness; and

aperture mask with rank 7 and 8 mm thickness.

31. The radiation camera method of claim 21 wherein said system further comprises an imaging camera configured to automatically frame and take unobstructed pictures of the visual camera field-of-view scene images associated with said RSD and communicate said field-of-view scene images to said CCD.

32. The radiation camera method of claim 21 wherein said system further comprises a stroboscopic flash controlled by said CCD that is configured to illuminate the field-of-view of said RSD.

33. The radiation camera method of claim 21 wherein said CAM is automatically rotated under control of said CCD based on a mask/anti-mask time period automatically calculated by said HCS based on source radiation and background radiation measurements retrieved by said CCD from said RSD.

34. The radiation camera method of claim 21 wherein said RSD further comprises a shutter frame time control that is automatically adjusted by said HCS based on source radiation and background radiation measurements retrieved by said CCD from said RSD.

35. The radiation camera method of claim 21 wherein said CCD maintains historical data of radiation images on a frame-by-frame basis as retrieved from said RSD.

36. The radiation camera method of claim 21 wherein said system further comprises a laser telemeter configured to measure the distance between said RSD and a radiation source and transmit said distance measurement to said CCD wherein said CCD is configured to determine a dose rate estimate associated with exposure to said radiation source using said transmitted distance measurement.

37. The radiation camera method of claim 21 wherein said system further comprises an external radiation dose rate meter configured to capture data on and directly measure radiation dosing external to said RSD and communicate said data to said CCD.

38. The radiation camera method of claim 21 wherein said system further comprises a 3-axis accelerometer configured to capture data on movement of said RSD and transmit said data to said CCD.

39. The radiation camera method of claim 21 wherein said system further comprises a 3-axis magnetometer configured to capture data on the axial position of said RSD with respect to terrestrial magnetic North and transmit said data to said CCD.

40. The radiation camera method of claim 21 wherein said system further comprises a temperature sensor configured to capture data on the temperature of said RSD and transmit said data to said CCD.

41. A tangible non-transitory computer usable medium having computer-readable program code means embodied thereon comprising a radiation camera method, said method operating in conjunction with a radiation camera system comprising:

(a) radiation sensor/detector (RSD);

(b) coded camera aperture mask (CAM);

(c) CAM ID reader (CIR);

(d) mask rotation motor (MRM);

(e) rotation detection sensor (RDS);

(f) radiation camera enclosure (RCE); and

(g) computing control device (CCD);

wherein;

said RCE is configured to mechanically couple said RSD, said CAM, said MRM, said RDS, and said CCD;

said CAM is configured to cover said RSD and collimate radiation external to said RCE that is presented to said RSD;

said MRM is configured to rotate said CAM under direction of said CCD;

said CAM further comprises coded identification indicia (CII);

said CII encodes a unique CAM identification and aperture mask type being applied to said RSD via said CAM;

said CIR is configured to read said CII and transmit said unique CAM identification said aperture mask type to said CCD;

said CAM further comprises a plurality of rotation indicia (PRI) that identify the current rotation angle of said CAM;

said plurality of rotation indicia (PRI) are configured to provide a clock with time intervals configured to detect the presence or absence of said CII when said CAM is rotated;

said RDS is configured to detect said plurality of rotation indicia (PRI);

said CCD is configured to capture detected radiation data from said RSD and transmit said detected radiation data via a digital communications medium (DCM) to a host computer system (HCS);

said CCD is configured to receive rotation commands from said HCS via said DCM and activate said MRM in response to said rotation commands; and

said CCD is configured to capture rotation data from said RDS and transmit said rotation data via said DCM to said HCS;

wherein said method comprises the steps of;

(1) rotating said CAM with said MRM under direction of said CCD;

(2) capturing detected radiation data from said RSD with said CCD and transmitting said detected radiation data via said DCM to said HCS;

(3) detecting said rotation indicia on said CAM with said RDS;

(4) receiving rotation commands with said CCD from said HCS via said DCM and activating said MRM in response to said rotation commands; and

(5) capturing rotation data with said CCD from said RDS and transmitting said rotation data via said DCM to said HCS.

42. The computer usable medium of claim 41 wherein said system further comprises a horizontal panning motor (HPM) controlled by said CCD and configured to enable horizontal panning of said RCE.

43. The computer usable medium of claim 41 wherein said system further comprises a vertical tilting motor (VTM) controlled by said CCD and configured to enable vertical tilting of said RCE.

44. The computer usable medium of claim 41 wherein said RDS comprises an optical sensor.

45. The computer usable medium of claim 41 wherein said DCM is selected from a group consisting of:

hardwired digital communication link; and

wireless digital communication link.

46. The computer usable medium of claim 41 wherein said CII comprises a series of magnets impregnated within a modular plastic holder (MPH) that retains said CAM.

47. The computer usable medium of claim 41 wherein said CCD is configured to read CAM identification data from a sensor operable to interpret said CII and further configured to transmit said CAM identification information to said HCS.

48. The computer usable medium of claim 41 wherein said rotation commands comprise commands to rotationally position said CAM in orthogonal “

mask” and

“

anti-mask”

positions.

49. The computer usable medium of claim 41 wherein said RSD comprises a gamma radiation detector.

50. The computer usable medium of claim 41 wherein said CAM is selected from a group consisting of:

aperture mask with rank 13 and 2 mm thickness;

aperture mask with rank 7 and 4 mm thickness; and

aperture mask with rank 7 and 8 mm thickness.

51. The computer usable medium of claim 41, wherein said system further comprises an imaging camera configured to automatically frame and take unobstructed pictures of the visual camera field-of-view scene images associated with said RSD and communicate said field-of-view scene images to said CCD.

52. The computer usable medium of claim 41 wherein said system further comprises a stroboscopic flash controlled by said CCD that is configured to illuminate the field-of-view of said RSD.

53. The computer usable medium of claim 41 wherein said CAM is automatically rotated under control of said CCD based on a mask/anti-mask time period automatically calculated by said HCS based on source radiation and background radiation measurements retrieved by said CCD from said RSD.

54. The computer usable medium of claim 41 wherein said RSD further comprises a shutter frame time control that is automatically adjusted by said HCS based on source radiation and background radiation measurements retrieved by said CCD from said RSD.

55. The computer usable medium of claim 41 wherein said CCD maintains historical data of radiation images on a frame-by-frame basis as retrieved from said RSD.

56. The computer usable medium of claim 41 wherein said system further comprises a laser telemeter configured to measure the distance between said RSD and a radiation source and transmit said distance measurement to said CCD wherein said CCD is configured to determine a dose rate estimate associated with exposure to said radiation source using said transmitted distance measurement.

57. The computer usable medium of claim 41 wherein said system further comprises an external radiation dose rate meter configured to capture data on and directly measure radiation dosing external to said RSD and communicate said data to said CCD.

58. The computer usable medium of claim 41 wherein said system further comprises a 3-axis accelerometer configured to capture data on movement of said RSD and transmit said data to said CCD.

59. The computer usable medium of claim 41 wherein said system further comprises a 3-axis magnetometer configured to capture data on the axial position of said RSD with respect to terrestrial magnetic North and transmit said data to said CCD.

60. The computer usable medium of claim 41 wherein said system further comprises a temperature sensor configured to capture data on the temperature of said RSD and transmit said data to said CCD.