Method for verifying radiation intensity modulating body and device for verifying same

Patent metadata

Field	Value
Publication number	US-10429826-B2
Application number	US-201515534730-A
Country	US
Kind code	B2
Filing date	Dec 16, 2015
Priority date	Dec 16, 2014
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

Provided are a method and apparatus for verifying a radiation beam intensity modulator. The apparatus includes a scanner; and a verification system verifying the verification target radiation beam intensity modulator, wherein the verification system includes: a modulator structure reconstruction unit extracting thickness information of the verification target radiation beam intensity modulator based on the 3D structure information of the verification target radiation beam intensity modulator; an original modulator structure information receiver receiving structure information of the original radiation beam intensity modulator; a modulator matching unit matching the verification target radiation beam intensity modulator with the original radiation beam intensity modulator based on the thickness information; and a modulator verification unit verifying the verification target radiation beam intensity modulator matched with the original radiation beam intensity modulator.

First claim

The invention claimed is:

1. An apparatus for verifying a radiation beam intensity modulator, the apparatus comprising:
a scanner configured to obtain an image of a verification target radiation beam intensity modulator by scanning the verification target radiation beam intensity modulator, and to generate 3D structure information of the verification target radiation beam intensity modulator based on the image; and
a verification system configured to verify the verification target radiation beam intensity modulator based on the 3D structure information of the verification target radiation beam intensity modulator and original radiation beam intensity modulator information,
wherein the verification system comprises:
a modulator structure reconstruction unit configured to extract thickness information of the verification target radiation beam intensity modulator based on the 3D structure information of the verification target radiation beam intensity modulator;
an original modulator structure information receiver configured to receive structure information of the original radiation beam intensity modulator;
a modulator matching unit configured to match the verification target radiation beam intensity modulator and the original radiation beam intensity modulator with each other based on the thickness information; and
a modulator verification unit configured to verify the verification target radiation beam intensity modulator matched with the original radiation beam intensity modulator.

2. The apparatus of claim 1 , wherein the scanner comprises:
a projector configured to project at least one pattern image to the verification target radiation beam intensity modulator;
an imaging device configured to capture an image of the radiation beam intensity modulator to which the at least one pattern image is projected;
a location adjuster configured to adjust a photographing location of the verification target radiation beam intensity modulator; and
a controller configured to calculate a 3D structure of the verification target radiation beam intensity modulator based on the image captured by the imaging device.

3. The apparatus of claim 2 , wherein the projector sequentially projects a plurality of pattern images having different gaps among patterns from one another.

4. The apparatus of claim 2 , wherein the imaging device includes a stereo camera having two cameras.

5. The apparatus of claim 2 , wherein the controller reconstructs the 3D structure of the verification target radiation beam intensity modulator as a depth matrix based on the image.

6. The apparatus of claim 1 , wherein the modulator matching unit obtains a thickness matrix from the 3D structure information of the verification target radiation beam intensity modulator and structure information of the original radiation beam intensity modulator, and matches the verification target radiation beam intensity modulator and the original radiation beam intensity modulator with each other based on one of center points of the verification target radiation beam intensity modulator and the original radiation beam intensity modulator, a beam isocenter, and a well-known certain reference point.

7. The apparatus of claim 1 , wherein the modulator matching unit obtains thickness matrixes of the verification target radiation beam intensity modulator and the original radiation beam intensity modulator from the 3D structure information of the verification target radiation beam intensity modulator and the structure information of the original radiation beam intensity modulator, and matches the verification target radiation beam intensity modulator with the original radiation beam intensity modulator so that a depth difference between corresponding points is minimum based on the thickness matrixes of the verification target radiation beam intensity modulator and the original radiation beam intensity modulator.

8. The apparatus of claim 7 , wherein the modulator matching unit calculates a maximum correlation coefficient (CC) between the thickness matrix of the verification target radiation beam intensity modulator and the original radiation beam intensity modulator and matches the verification target radiation beam intensity modulator with the original radiation beam intensity modulator so that the maximum CC is close to 1,

CC
=

∑

m
⁢

∑

n
⁡

(

PRC
mn

-

PRC
_

)

⁢

(

MRC
mn

-

MRC
_

)

(

∑

m
⁢

∑

n
⁡

(

PRC
mn

-

PRC
_

)

2

)

⁢

(

∑

m
⁢

∑

n
⁡

(

MRC
mn

-

MRC

Assignees

• Samsung Life Public Welfare Foundation

Inventors

• Ju Sang Gyu

Classifications

• A61N2005/1087

  Ions; Protons · CPC title

• A61N5/10 Primary

  X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy (A61N5/01 takes precedence) · CPC title

• A61N5/1031

  using a specific method of dose optimization · CPC title

• A61N5/1075

  for testing, calibrating, or quality assurance of the radiation treatment apparatus · CPC title

• A61N5/1042

  with spatial modulation of the radiation beam within the treatment head · CPC title