IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0223712
(2007-02-02)
|
등록번호 |
US-8183541
(2012-05-22)
|
우선권정보 |
EP-06101441 (2006-02-09) |
국제출원번호 |
PCT/EP2007/051036
(2007-02-02)
|
§371/§102 date |
20080930
(20080930)
|
국제공개번호 |
WO2007/090798
(2007-08-16)
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발명자
/ 주소 |
|
출원인 / 주소 |
- Deutsches Krebsforschungszentrum des Oeffentlichen Rechts
|
대리인 / 주소 |
Birch, Stewart, Kolasch & Birch, LLP
|
인용정보 |
피인용 횟수 :
10 인용 특허 :
0 |
초록
▼
The invention relates to a radiation treatment apparatus and an inverse treatment planning method for intensity modulated particle therapy for the treatment of a target within a biological system using at least two fields, each field comprising a plurality of Bragg peaks, the at least two fields bei
The invention relates to a radiation treatment apparatus and an inverse treatment planning method for intensity modulated particle therapy for the treatment of a target within a biological system using at least two fields, each field comprising a plurality of Bragg peaks, the at least two fields being planned to place a defined number of beam spots j from different directions with certain weights wj within the target. The inverse treatment planning method optimizes the weights wj of the beam spots for the at least two fields simultaneously in order to produce a prescribed biological effect within the target by minimizing an objective function based on biological effects ε, the biological effects ε being treated in a linear-quadratic model, which describes the biological effects in the target by two parameters α and β, where ε=αD+βD2, D denoting a dose, and wherein the two parameters α and β for each voxel i of the target (αi and βi) are calculated as dose-averaged mean values of αi,j- and √{square root over (βi,j)}-components, which relate to all beam spots j contributing to a total dose Di in the voxel i.
대표청구항
▼
1. An inverse treatment planning method for intensity modulated particle therapy for the treatment of a target within a biological system using at least two fields, each field comprising a plurality of Bragg peaks, the at least two fields being planned to place a defined number of beam spots j from
1. An inverse treatment planning method for intensity modulated particle therapy for the treatment of a target within a biological system using at least two fields, each field comprising a plurality of Bragg peaks, the at least two fields being planned to place a defined number of beam spots j from different directions with certain weights wj within the target, wherein the inverse treatment planning method optimizes the weights wj of the beam spots for the at least two fields simultaneously in order to produce a prescribed biological effect within the target by minimizing an objective function based on biological effects ε, the biological effects ε being treated in a linear-quadratic model which describes the biological effects in the target by two parameters α and β, where ε=αD+βD2, D denoting a dose, and wherein the two parameters α and β for each voxel i of the target αi and βi are calculated as dose-averaged mean values of αi,j- and √{square root over (βi,j)}-components, which relate to all beam spots j contributing to a total dose Di in the voxel i, wherein the two parameters α and β for each voxel i of the target (αi and βi) are calculated as dose-averaged mean values of the form αi=1Di∑j=1NwjDi,jαi,jandβi=1Di∑j=1NwjDi,jβi,j for Di>0, Di=∑j=1NwjDi,j with N beam spots contributing to the total dose Dj in voxel i. 2. The inverse treatment planning method according to claim 1, wherein an objective function is minimized, which is based on the formula Fɛ(w→)=∑i∈T(ɛi(w→)-ɛT)2 with εi denoting the biological effect in the voxel i of the target, {right arrow over (w)} the weights of the beam spots and εT the prescribed biological effect of a reference radiation. 3. The inverse treatment planning method according to claim 1, wherein an objective function is minimized, which is based on the formula Fɛ(w→)=∑i∈T(αi(w→)Di(w→)+βi(w→)Di2(w→)-ɛT)2 with Di denoting the total dose of the at least two fields in voxel i and αi and βi the α- and β-values at voxel i, wherein Di=∑j=1NwjDi,j with Di,j denoting a dose contribution of beam spot j at voxel i for unit fluence, N beam spots contributing to the dose Di at voxel i, and wj denoting a weighting factor of beam spot j and wherein the prescribed biological effect εT is given by εT=αTxDT+βTxDT2 with αTX and βTX being X-ray response parameters of the target and DT denoting a prescribed photon dose. 4. The inverse treatment planning method according to claim 1, wherein an objective function is minimized, which includes constraints relating to minimum and maximum biological effect levels for the target and maximum effect levels for organs at risk or normal tissue within the biological system. 5. The inverse treatment planning method according to claim 1, wherein the αi,j- and √{square root over (βi,j)}-components are derived from a radiobiological model or from measured data for α and β as a function of depth in a single Bragg peak. 6. The inverse treatment planning method according to claim 1, wherein a constant value βi,j=βi is set, which depends only on a tissue type at voxel i. 7. The inverse treatment planning method according to claim 1, wherein the αi,j-components are assumed to be laterally constant and are extracted from a single curve as a function of residual range, independent of an initial beam energy. 8. Use of an inverse treatment planning method for intensity modulated particle therapy for the treatment of a target within a biological system using at least two fields, each field comprising a plurality of Bragg peaks, the at least two fields being planned to place a defined number of beam spots j from different directions with certain weights wj within the target, wherein the inverse treatment planning method optimizes the weights wj of the beam spots for the at least two fields simultaneously in order to produce a prescribed biological effect within the target by minimizing an objective function based on biological effects ε, the biological effects ε being treated in a linear-quadratic model which describes the biological effects in the target by two parameters α and β, where ε=αD+βD2, D denoting a dose, and wherein the two parameters α and β for each voxel i of the target αi and βi are calculated as dose-averaged mean values of αi,j- and √{square root over (βi,j)}-components, which relate to all beam spots j contributing to a total dose Di in the voxel i for planning the treatment of a tumor with an ion beam containing ions with an atomic number ≧2. 9. A radiation treatment apparatus for delivering a radiation treatment to a target within a biological system comprising a field unit for generating at least two fields, each field comprising a plurality of Bragg peaks, the at least two fields being provided to place a defined number of beam spots j from different directions with certain weights wj within the target anda unit for inverse treatment planning being provided for optimizing the weights wj of the beam spots for the at least two fields simultaneously before the radiation treatment in order to produce a prescribed biological effect within the target by minimizing an objective function based on biological effects ε, the biological effects ε being treated in a linear-quadratic model, which describes the biological effects in the target by two parameters α and β, where ε=αD+βD2, D denoting a dose, and wherein the two parameters α and β for each voxel i of the target (αi, βi) are calculated as dose-averaged mean values of αi,j- and √{square root over (βi,j)}-components, which relate to all beam spots j contributing to a total dose Di in the voxel i.
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