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Optimisation of Irradiation Directions   in IMRT Planning Rick Johnston Matthias Ehrgott Department of Engineering Science University of Auckland M. Ehrgott, R. Johnston Optimisation of Irradiation Directions in IMRT Planning, OR Spectrum 25(2):251-264, 2003
What is Radiotherapy?
[object Object],[object Object],IMRT
Model Formulation ,[object Object],Voxels Bixels gantry
Angle Discretisation ,[object Object],[object Object],[object Object]
MOMIP Model ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],To study effect of direction optimisation consider weighted sum min   1 T 1 +   2 T 2  + ... +   K T K Extension of multicriteria model by Hamacher/Kßfer
Solution Methods   ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Integrated Methods ,[object Object],[object Object],[object Object],MIP SOLVER 1
[object Object],Isodose curve pictures obtained with prototype software developed at ITWM, Kaiserslautern
Integrated Methods ,[object Object],[object Object],[object Object],LOCAL SEARCH 2
Local Search Movie
Two-phase Methods ,[object Object],[object Object],[object Object],Fully irradiate every voxel in the tumour Avoid damage to healthy organs Benefits: SET COVERING 3
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object]
[object Object],[object Object]
Two-Phase Methods ,[object Object],4 Optimal solution of LP relaxation 10-40 beams used
 
Results ,[object Object],[object Object],[object Object]
[object Object],[object Object]
Comparison Objective 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 Problem 1 3 heads Problem 1 4 heads Problem 2 3 heads Problem 2 4 heads Problem 3 3 heads Set Covering LP relaxation Local Search Mixed Integer
Objective vs. Time Objective 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0 2000 4000 6000 8000 10000 12000 Time (s) Local search  improvement Set Covering Local Search LP relaxation Mixed Integer

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Imrt

  • 1. Optimisation of Irradiation Directions in IMRT Planning Rick Johnston Matthias Ehrgott Department of Engineering Science University of Auckland M. Ehrgott, R. Johnston Optimisation of Irradiation Directions in IMRT Planning, OR Spectrum 25(2):251-264, 2003
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  • 21. Comparison Objective 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 Problem 1 3 heads Problem 1 4 heads Problem 2 3 heads Problem 2 4 heads Problem 3 3 heads Set Covering LP relaxation Local Search Mixed Integer
  • 22. Objective vs. Time Objective 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0 2000 4000 6000 8000 10000 12000 Time (s) Local search improvement Set Covering Local Search LP relaxation Mixed Integer

Hinweis der Redaktion

  1. Welcome. Name, supervisor, conjunction with Auckland Hospital.
  2. Contrary public opinion, radiotherapy nothing do with radios. Three Treatments for cancer, local to area. Successful 60%, non-metastastised localised cancers. What going talk about today
  3. Starship Enterprise. Machine, bed interaction. Gantry turns. Number of Irradiation Directions. Auckland Hospital; welcome! Long setup times.
  4. Represents 2-d version what just saw. Bixels – intensity across the beam. Voxels, break up body into homogeneous segments. LP formulation, specify maximum dose to healthy organs, min dose tumour
  5. Creates linear problem from high-dimensional multi-extremal non-linear optimisation. (CLICK) Number of positions used picked by planners (say three). Large no. of LPs. Better approach than other papers in field.
  6. Two main approaches.
  7. MIP: each possible angle has a boo var associated. Allow only fixed number of boo variables be ‘on’ then solve. Problems. Very slow improve on initial solution. Failed find feasible integer solution in difficult problems. Priority list, improved search techniques (no time)
  8. Set is the volume of the tumour, aim to cover tumour with radiation. Aim: replicate planner decision strategies. Aim for gaps. Results: good for low number of insertion points. Generalised SC and Distribution methods.
  9. Phase 1: allow irradiation from any number of directions Phase 2: use heuristics to consider only a few of these directions. Includes Local Search