1. G4NAMU GEANT4 North America Medical Users Organization (G4NAMU) GEANT4 in external beam therapy Harald Paganetti

2. G4NAMU TOPIC I: Beamline design and quality assurance

3. G4NAMU TOPIC II: Magnetic fields

4. G4NAMU TOPIC III: Absolute dosimetry Volume for absolute dosimetry

5. G4NAMU TOPIC IV: Patient dose calculation FOCUS Monte Carlo

6. G4NAMU TOPIC V: Time dependent simulations Solid lines:Patient in inhale Dashed lines:Considering the entire breathing phase

7. G4NAMU TOPIC VI: Radiation Protection

8. G4NAMU TOPIC VII: Radiation Risk © X. George Xu, RPI

9. G4NAMU TOPIC VIII: Detector Simulation

10. G4NAMU GEANT4 users in external beam radiation therapy in North America: Issues: Correct and reliable physics lists Physics wish list for upcoming new G4 versions Tracking wish list for upcoming new G4 versions CT-formats (DICOM etc) Accuracy as a function of level of detail Benchmarking data set (exp, theo) G4NAMU and other Monte Carlo groups Teaching course

11. G4NAMU Correct and reliable physics lists Protons: send e-mail to hpaganetti@partners.org

12. Possible problem in the elastic multiple scattering algorithm © Joao Seco Royal Marsden, London, UK

13. Issues related to dose calculations on CT data Memory consumption for storing CT data Conversion of CT Hounsfield units G4NAMU

14. DICOM http://bromley.phy.ulaval.ca/phys_med/DICOM/index.html G4NAMU

16. Neutron energy distributions for 150 MeV protons incident on a 1cm water slab © Wang and Paganetti RPI, New York; MGH, Boston

17. G4NAMU Role of G4NAMU with respect to other groups : Computational Medical Physics Working Group (CMPWG) American Nuclear Society (ANS) Mathematics and Computations (M&C) Biology and Medicine (BMD) Radiation Protection and Shielding (RPSD)  Bernadette Kirk AAPM Task Group 105: “Monte Carlo in Clinical Treatment Planning“  Bruce Curran and Indrin Chetty