DARTMOUTH ENGS 167 - RADIATIONG THERAPY (17 pages)

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RADIATIONG THERAPY



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RADIATIONG THERAPY

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Lecture Notes


Pages:
17
School:
Dartmouth College
Course:
Engs 167 - Medical Imaging

Unformatted text preview:

11 20 2006 ENGG 167 MEDICAL IMAGING Lecture 22 Monday Nov 20 Radiation Therapy II Treatment Planning External Beam Shaping Brachytherapy References The Modern Technology of Radiation Oncology Ed J Van Dyk Medical Physics Publ 1999 1 Radiation Therapy II 1 Treatment Planning 2 Radiation Therapy Beam Shaping 3 Brachytherapy 4 Radiation Treatment Room Design 5 Cancer Chemotherapy 2 1 11 20 2006 Treatment planning input CT scan images Ref www varian com 3 Treatment planning target organs and doses Ref www varian com 4 2 11 20 2006 Treatment planning dose histograms Ref www varian com 5 Model Based Treatment Planning Overall approach Forward model radiation transport given source positions and tissue geometry Inverse model determining the optimal source pattern to cover the target volume and spare sensitive normal tissues Iterative solution choice of approaches are possible Ref http www dkfz de medphys physicalmodels imrt html 6 3 11 20 2006 Dose Fluence convolved with Dose Kernel Dose kernel K is a complete summation of radiation energy imparted to the tissue from a point source of radiation fluence Ref Van Dyk 7 Dose spread kernels for initial and secondary scattered radiation field Ref Van Dyk 8 4 11 20 2006 Monte Carlo prediction of scatter and kerma Ref Van Dyk 9 Model based prediction of dose Ref Van Dyk 10 5 11 20 2006 Iterative Treatment planning prostate plans http www aapm org meetings 02AM pdf 8299 37342 pdf 11 Treatment verification portal imaging Direct detection of Tx beam Specialized detector for high energy photons allows online monitoring very poor contrast though Ref www varian com 12 6 11 20 2006 Beam Shaping older methods Shielding blocks used to spare normal tissues and allow maximal delivery to tumor tissues Generally most are replaced now with multi leaf collimators Ref Van Dyk 13 Beam Shaping current multi leaf collimators Refs Van Dyk www varian com 14 7 11 20 2006 Beam Shaping current method multi leaf collimators Jaws and multileaf collimators



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