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Discussion Items Image Registration in Radiotherapy: Consider the Costs as well as the Benefits •Information about the Royal Brisbane Hospital •Benefits of Image Registration •Use of image registration at the RBH •Costs of image registration •Work processes Kevina Choma Central Area Health Services Cancer Care Services - RBH Medicare Benefits Schedule Discussion Items •Information about the Royal Brisbane Hospital •Benefits of Image Registration •Use of image registration at the RBH •Costs of image registration •Work processes Benefits of Image Registration Benefits of Image Registration •The ability to better visualise the GTV and PTV Benefits of Image Registration CT based PTV PET based PTV Benefits of Image Registration •The ability to better visualise the GTV and PTV •Account for tumour motion through duration of scan •Reduced interobserver variations •Reduction in PTV size for some patients leading to dose escalation Benefits of Image Registration CT–MRI image fusion: delineation of the clinical target volume (CTV) and critical organs. Red line, CT CTV; yellow line, MRI CTV; blue line, rectum (CT); green line, bladder (CT). Potential Sources of Error •Choose the best technique •Mismatching non-rigid structures Sannazzari, G., Ragona, R., Redda, M, Giglioli, F., Isolato, G., Guarneri, A., (2002), CT-MRI Image Fusion for Delineation of Volumes in ThreeDimensional Conformal Radiation Therapy in the Treatment of Localized Prostate Cancer. The British Journal of Radiology, 75: 603-607. Potential Sources of Error Potential Sources of Error Potential Sources of Error Potential Sources of Error •Choose the best technique •Mismatching non-rigid structures •Image Resolution differences between modalities •Window levels Discussion Items •Information about the Royal Brisbane Hospital •Benefits of Image Registration •Use of image registration at the RBH •Costs of image registration •Work processes Image Registration Workload Image Registration Workload by Modality Tumour Type per Modality -PET Tumour Type per Modality-MRI Tumour Type per Modality -CT Discussion Items Start-up Costs •Information about the Royal Brisbane Hospital •Benefits of Image Registration •Use of image registration at the RBH •Costs of image registration •Work processes Treatment planning system $1,600,000 Data transfer system $12-30,000 Flat Top Couch $20,000 Stabilisation equipment $10,000 Wall mounted lasers $19,500 Same equipment for RT dept $10,000 Staff Training approx 56 FTE hours Ongoing Costs Imaging study $800 Patient travel/inconvenience up to ~ $600 RT staff in MI department 25FTE hrs/month Registration and QA 15FTE hrs/month Opportunity costs 25 less patients simulated/month 40 FTE hrs/month RO QA time RO voluming time Discussion Items •Information about the Royal Brisbane Hospital •Benefits of Image Registration •Use of image registration at the RBH •Costs of image registration •Work processes Ongoing Costs Increased complexity of planning and treatment Ongoing staff training ~ 11/2 FTE hrs/month Poor registrations – reduced value to patient and increased time involved in performing registration Work Processes •Collaboration with Medical Imaging department •Use of PET transmission scan for registration •Alignment of patient appointments •Limitation on staff who can perform registrations •Use the PET transmission scan as the planning study •Use of software based mutual information algorithm Conclusion •The use of image registration potentially benefits patients having radiation therapy treatment provided it is used correctly. •Demand for this tool is increasing •Important to develop and maintain processes to ensure quality and cost effectiveness Thanks for your attention Thank you to Greg Rattray for advice and helping with the images References References 1. 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