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© Hitachi Medical Corporation. 2014. All rights reserved. © Hitachi Medical Corporation. 2014. All rights reserved.

Collapsed Cones Convolution Superposition

IMRT DMPO(Direct Machine Parameter Optimization)

Pinnacle3

© Hitachi Medical Corporation. 2014. All rights reserved.





D(r)

dV r-r’

r r’

r1’

r2’ r3’

= Ä


D(r)

dV r-r’

r r’

r1’

r2’ r3’

D r r r K r r V

( ) ( ) ( ) ( ) = ¢ ¢ - ¢ ò m

r Y

= Ä

dV


D(r)

dV r-r’

r r’

r1’

r2’ r3’

D r r r K r r dV V

( ) ( ) ( ) ( ) = ¢ ¢ - ¢ ò m

r Y

D r r r K r r r r K r r ( ) ( ) ( ) ( ) ( ) ( ) ( ) K = ¢ ¢ - ¢ ì í î

+ ¢ ¢ - ¢ + ü ý þ

å m r

m r 1 1 1 2 2 2 Y Y

= Ä


T r r r ( ) ( ) ( ) ¢ = ¢ ¢ m

r Y


= mr

m

r

mr

mr


r ( ) = ¢ Y Φ0 hν exp(-μd

Bin

X m) Y m)


2D array

Bin

X m) Y m)


X

Bin

Primary Colimator


X


X J

aw

Y Jaw Flattening Filter

Jaw


X J

aw

Y Jaw

X

X 0

1

Flattening Filter

Jaw


X J

aw

Y Jaw

X 0

1

MLC

MLC

Flattening Filter

Jaw


X J

aw

Y Jaw

X 0

1

MLC

MLC

Flattening Filter

Jaw


MLC

X J

aw

Y Jaw

Tongue & groove

Interleaf Transmission

Leaf end Transmission

(Offset)

MLC MLC

Flattening Filter

Jaw


Offset

MLCOff-center

X

Offset

MLC Leaf End Radius


Ideal beam


with

( )



OCR

Ideal beam


OCR

Ideal beam


Ä

OCR

Ideal beam


Ideal beam

OCR


Ideal beam

OCR

Cross Line

In Line



Patient surface

Electron contamination

Electron dose

Depth

Dose

PDD



Ä Ä Ä

ò E m/r lookup


m/r lookup

m/r lookup

m/r lookup"Photon Mass Attenuation and Energy-absorption Coefficients from 1 keV to 20 MeV" by J H Hubbell (Int J Appl Radiat Isot, Vol 33, pp 1269 to 1290, 1982).


m/r lookup

m/r lookup

m/r lookup"Photon Mass Attenuation and Energy-absorption Coefficients from 1 keV to 20 MeV" by J H Hubbell (Int J Appl Radiat Isot, Vol 33, pp 1269 to 1290, 1982).



m/r lookup

CT

m/r lookup

r ( ) ¢ r ( ) ¢ r

r ¢ r r ( ) - ¢ r r ( ) - ¢ r

r r ¢ - ( )


Y r1 ¢ r1 ( ) ¢ r

r1 ¢


Y r1 ¢ r1 ( ) ¢ r

r1 ¢


Y r1 ¢ r1 ( ) ¢ r

r1 ¢


hni


S Wi(hni) Ki(hni)

hni

hni

Ki


r rK r ( ) - ¢ ) r r

r ¢ - ( © Hitachi Medical Corporation. 2014. All rights reserved.

Zenith Bins Azimuth Bins

Fast Convolve 8 Bins 5 Bins

CCCS AdaptiveConvolve 48 Bins 24 Bins


Continuous

Dose Spread Kernel

Discrete

Dose Spread Kernel

(Collapsed Cones)

voxel size 16mm voxel size 4mm

Adaptive Convolve CCCS

4mm



= =


= = =


= = =

=


=


=

=


=

=

=


=

≠

=

= = =


≠



2KPPCENG · â + ô * ú - 大阪大学大学院医学系研究科 ... > > > Ä > I ý > à > I > u...

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