Head and Neck Immobilization devices 3 Clamp 4 Clamp 5 Clamp Random Errors with different Fixation devices Immobilization device Random 3D error (1 SD,mm) Hesd Neck Shouldersb Three-fixation-point mask 0.7 09 2.39 Four-fixation-point mask 09 10 0.8 Five-fixation-point mask 10 10 1.2 Radiotherapy Oncology,2001
Head and Neck Immobilization devices 3 Clamp 4 Clamp 5 Clamp Random Errors with different Fixation devices Radiotherapy Oncology,2001
Verification Of Patient Positioning Incorporation of EPID. Cone beam CT Correction Software IGRT
•Incorporation of EPID. •Cone beam CT •Correction Software •IGRT Verification Of Patient Positioning
Set-up verification using portal imaging;review of current clinical practice Systemic Random Errors Film or EPID No.of patients No.of images Direction n(am） Cnnm (mm) Fim 22 193 21 21 2.1 1 EPID 21 (old mask) 470 品 13112 15 1 16 EPID 10 (new mask) 156 Film 27 234 111730楼 Film 29 136 532: EPID 356 品 rot ap rot ml Film(85%):EPD(15% 515 EPID 12 (PVC) 2.0 EPID 12 290 品 1.3 1111474 2.2 Radiotherapy And Oncology 2001
Radiotherapy And Oncology 2001. Systemic & Random Errors
Immobilization and Set Up Uncertainties Needs with the changing Paradigm 6 5 ◆ Medio-lateral Cranlo-caudal Anterior-posterior 4 3 2 0 2 5 Systematic error(mm;1 SD) Permissible Errors with State of Art equipment: Recommendations for Good Clinical Practice
Immobilization and Set Up Uncertainties Needs with the changing Paradigm Permissible Errors with State of Art equipment: Recommendations for Good Clinical Practice
Guidelines for patient positioning in head and neck cancer Setup the patient with neutral neck position. minimizes intra-fraction patient motion Use a customized head and neck support and face mask for each patient. improves accuracy of field matching(Neck and LAN fields) Index immobilization apparatus to the treatment table. Improves treatment setup efficiency and accuracy Use active patient position monitoring system(LED camera System) Improves setup accuracy and reproducibility,and minimizes intra- fraction patient motion These strategies can reduce the setup random errors to less than 2 mm for upper neck
Guidelines for patient positioning in head and neck cancer Setup the patient with neutral neck position. minimizes intra-fraction patient motion Use a customized head and neck support and face mask for each patient. improves accuracy of field matching (Neck and LAN fields) Index immobilization apparatus to the treatment table. Improves treatment setup efficiency and accuracy Use active patient position monitoring system (LED camera System) Improves setup accuracy and reproducibility, and minimizes intrafraction patient motion These strategies can reduce the setup random errors to less than 2 mm for upper neck