Large-volume scintillator detector for rapid real-time 3-D dose imaging of advanced radiation therapy modalities

• US 9,625,583 B2
• Filed: 05/30/2014
• Issued: 04/18/2017
• Est. Priority Date: 05/31/2013
• Status: Active Grant

• Current Assignee: Universite Laval
• Original Assignee: Universite Laval, Board of Regents of the University of Texas System (University of Texas System)
• Inventors: Robertson, Daniel, Beddar, A. Sam, Archambault, Louis
• Primary Examiner(s): Gaworecki, Mark R
• Application Number:
  US14/893,872
• Publication Number:
  US 20160103227A1
• Time in Patent Office: 1,054 Days
• CPC Class Codes: A61N 5/1071 for verifying the dose delivered by the treatment plan
• CPC Class Codes: G01T 1/10 Luminescent dosimeters
• CPC Class Codes: G01T 1/2042 Composition for liquid scintillation systems
• CPC Class Codes: G01T 1/29 Measurement performed on radiation beams, e.g. position or section of the beam; Measurement of spatial distribution of radiation

Abstract

An apparatus and method for measuring three-dimensional radiation dose distributions with high spatial and temporal resolution using a large-volume scintillator. The scintillator converts the radiation dose distribution into a visible light distribution. The visible light is transported to one or more photo-detectors, which measure the light intensity. The light signals are processed to correct for optical artifacts, and the three-dimensional light distribution is reconstructed. The reconstructed light distribution is post-processed to convert light amplitudes to measured radiation doses. The high temporal resolution of the detector makes it possible to observe the evolution of a dynamic dose distribution as it changes over time. Integral dose distributions can be measured by summing the dose over time.

Claims

1. A radiation dose detector device, comprising:

a scintillating element;

a plurality of light detectors configured to detect light emitted from the scintillating element, wherein;

the plurality of light detectors are coupled to a housing extending around the scintillating element;

each light detector of the plurality of light detectors comprises a field of view;

the entire scintillating element is in the field of view of each light detector of the plurality of light detectors; and

a computer, wherein the computer is configured to receive data from the plurality of light detectors and configured to generate a three-dimensional map of light emitted from the scintillating element.

2. The radiation dose detector device of claim 1 wherein the plurality of light detectors are configured to simultaneously detect light emitted from the scintillating element.

3. The radiation dose detector device of claim 1 wherein at least one of the plurality of light detectors are selected from the group consisting of:

charge-coupled device (CCD) cameras, complementary metal-oxide sensor (CMOS) cameras, light field cameras, photodiode arrays and photomultiplier tube arrays.

4. The radiation dose detector device of claim 1 wherein the plurality of light detectors are coupled to a housing, wherein the housing is configured to block external light from entering the radiation dose detector.

5. The radiation dose detector device of claim 1 further comprising a collimator between the scintillating element and at least one of the plurality of light detectors.

6. The radiation dose detector device of claim 1 further comprising one or more optical fibers between the scintillating element and at least one of the plurality of light detectors.

7. The radiation dose detector device of claim 1 wherein the computer comprises a computer readable medium comprising software configured to execute a pre-processing algorithm, a tomographic reconstruction algorithm and a post-processing algorithm.

8. The radiation dose detector device of claim 7 wherein the pre-processing algorithm is configured to correct for both optical and dosimetric artifacts.

9. The radiation dose detector device of claim 7 wherein the tomographic reconstruction algorithm converts data received from the plurality of light detectors into a three-dimensional dose distribution.

10. The radiation dose detector device of claim 9 wherein the tomographic reconstruction algorithm comprises a filtered backprojection algorithm.

11. The radiation dose detector device of claim 9 wherein the tomographic reconstruction algorithm comprises an iterative algorithm.

12. The radiation dose detector device of claim 7 wherein the post-processing algorithm is configured to convert grayscale levels of three-dimensional light distribution into actual dose values by comparison with a reference measurement.

13. A three-dimensional radiation dose detector device, comprising:

a continuous volumetric scintillating element; and

means for measuring the light emission from said scintillating element from multiple positions or directions simultaneously and with high temporal resolution, wherein;

said means for measuring the light emission from said scintillating element is positioned around said scintillating element;

said means for measuring the light emission from said scintillating element comprises a depth of field that extends through said scintillating element.

14. The radiation dose detector device of claim 13 wherein the continuous volumetric scintillating element has a volume of about 500 to 15,000 cubic centimeters.

15. The radiation dose detector device of claim 13 wherein the temporal resolution is up to 100 samples per second.

16. The radiation dose detector device of claim 13, wherein said scintillating element is an organic or inorganic material in solid, liquid, or gelatinous state.

17. The radiation dose detector device of claim 13, wherein said means for measuring light emission comprises one or more charge-coupled devices, complementary metal-oxide-semiconductor devices, light field cameras, photomultiplier tubes, photodiodes, avalanche photodiodes.

18. The radiation dose detector device of claim 13, wherein said means of measuring light emission comprises one or more light-field imagers or plenoptic cameras.

19. The radiation dose detector of claim 13, wherein said means for measuring light emission includes detectors equally spaced at an angle θ

, with the sum of all angles equal to 360 degrees.

20. The radiation dose detector device of claim 13, wherein said means for measuring light emission includes detectors unequally-spaced at angles θ

i, where the sum of all θ

i equals 360 degrees or less.