Method of determining distribution of a dose in a body

Patent metadata

Field	Value
Publication number	US-9295432-B2
Application number	US-201314434410-A
Country	US
Kind code	B2
Filing date	Oct 10, 2013
Priority date	Oct 19, 2012
Publication date	Mar 29, 2016
Grant date	Mar 29, 2016

Abstract

A method of determining a distribution of a dose in a body is presented including the steps of scanning at least one region of the body to extract image data, calculating a plurality of parameters from the image data, and entering a plurality of computed tomography (CT) scan parameters. The method also includes the steps of calculating radiation distribution by using a local interaction principle and creating a three-dimensional dose map based on the calculated radiation distribution.

First claim

The invention claimed is:

1. A method of determining a radiation distribution of a dose in a body, the method comprising:
scanning at least one region of the body to extract image data, wherein the image data is represented as a plurality of three-dimensional cubic voxels;
calculating a plurality of parameters from the image data;
entering a plurality of computed tomography (CT) scan parameters;
calculating the radiation distribution by using a customized local interaction principle, which calculates a radiant flux of the plurality of three-dimensional cubic voxels by measuring radiant fluxes flowing between neighboring cubic voxels of the plurality of three-dimensional cubic voxels; and
creating a three-dimensional dose map based on the calculated radiation distribution.

2. The method according to claim 1 , further comprising rescaling the image data.

3. The method according to claim 1 , further comprising representing the image data as either a 64×64 voxel grid or a 128×128 voxel grid in an x-y plane.

4. The method according to claim 1 , wherein the radiation distribution indicates an energy absorbed in every voxel.

5. The method according to claim 1 , wherein the plurality of CT scan parameters includes at least one of attenuation factors, phase function factors, and scattering factors.

6. The method according to claim 1 , further comprising computing the radiation distribution in six directions for scattering according to the following formula:

I

+
x

⁡

(

i
,
j
,
k

)

=

T
⁡

(

i
,
j
,
k

)

*

I

+
x

⁡

(

i
-
1

,
j
,
k

)

+

R
⁡

(

i
,
j
,
k

)

*

I

-
x

⁡

(

i
+
1

,
j
,
k

)

+

S
⁡

(

i
,
j
,
k

)

*

(

I

+
y

⁡

(

i
,

j
-
1

,
k

)

+

I

-
y

⁡

(

i
,

j
+
1

,
k

)

+

I

+
z

⁡

(

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j
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k
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1

)

+

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z

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j
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k
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1

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)

where 1 represents radiant flux, i, j and k are unit vect

Assignees

• Koninkl Philips Nv

Inventors

• Gerland Elazar Lars

Classifications

• A61B6/466

  adapted to display 3D data · CPC title

• A61B6/032 Primary

  Transmission computed tomography [CT] · CPC title

• G06T2207/10104

  Positron emission tomography [PET] · CPC title

• G16H50/30

  for calculating health indices; for individual health risk assessment · CPC title

• G06T2207/20104

  Interactive definition of region of interest [ROI] · CPC title