Intensity modulated field

It is often difficult to make homogenous dose distribution with several photon beams. In such case, homogenous distribution for complex target may be achieved easily by make eIntensity modulated fieldf, at first.

Let's try to make plan for this 'L' shape GTV.

http://www.geocities.jp/nekoone2000v/photos/2007/Lshape/L0.JPG

http://www.geocities.jp/nekoone2000v/photos/2007/Lshape/L1.JPG

http://www.geocities.jp/nekoone2000v/photos/2007/Lshape/L2.JPG

http://www.geocities.jp/nekoone2000v/photos/2007/Lshape/L3.JPG

http://www.geocities.jp/nekoone2000v/photos/2007/Lshape/L4.JPG

In this situation, the dose is distribution seems to be a crossing..

http://www.geocities.jp/nekoone2000v/photos/2007/Lshape/L5.JPG

Additional fields are added only necessary areas to bottom up.

http://www.geocities.jp/nekoone2000v/photos/2007/Lshape/L6.JPG

http://www.geocities.jp/nekoone2000v/photos/2007/Lshape/L7.JPG

http://www.geocities.jp/nekoone2000v/photos/2007/Lshape/L8.JPG

Adjust dose weight

http://www.geocities.jp/nekoone2000v/photos/2007/Lshape/L9.JPG

Complete

http://www.geocities.jp/nekoone2000v/photos/2007/Lshape/L10.JPG

 

Round background field

http://www.geocities.jp/nekoone2000v/photos/2007/Lshape/L11.JPG

Adjust dose weight

http://www.geocities.jp/nekoone2000v/photos/2007/Lshape/L12.JPG

Complete

http://www.geocities.jp/nekoone2000v/photos/2007/Lshape/L13.JPG

 

Appendix

Let's try to make plan for this 'O' shape GTV.

http://www.geocities.jp/nekoone2000v/photos/2007/Lshape/O0.jpg

Rotational center is a center of GTV. Inner Jaw is overrided. A dose indication point is set in an appropriate place.

Arc : 0->90, 90->180, 180->270, 270->0

http://www.geocities.jp/nekoone2000v/photos/2007/Lshape/O1.jpghttp://www.geocities.jp/nekoone2000v/photos/2007/Lshape/O2.jpghttp://www.geocities.jp/nekoone2000v/photos/2007/Lshape/O3.jpg

Adjust dose weight

http://www.geocities.jp/nekoone2000v/photos/2007/Lshape/O4.jpg

Complete

 http://www.geocities.jp/nekoone2000v/photos/2007/Lshape/O5.jpg http://www.geocities.jp/nekoone2000v/photos/2007/Lshape/O6.jpg

 

<Hint for planner>

http://www.geocities.jp/nekoone2000v/photos/2007/Lshape/bottom-up.JPG

 http://www.geocities.jp/nekoone2000v/photos/2007/physical/celluloid_picture_CFIMRT_anm.gif

<Although I wrote the above-mentioned text in 2007, changing until it continues up to now twists it, and it is true.>

last modification date: 2014/08/15

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