oncentra prostate image fusion - brachyacademy · image fusion applications (cont) mp-mri fusion:...
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![Page 1: Oncentra Prostate Image Fusion - BrachyAcademy · Image fusion applications (cont) mp-MRI fusion: T2-DWI. Focal GTV delineation - DWI. Focal GTV delineation - DCE. Joshua.Mason@leedsth.nhs.uk](https://reader033.vdocuments.mx/reader033/viewer/2022042712/5fa5fbc759f5063570725f53/html5/thumbnails/1.jpg)
Oncentra Prostate Image Fusion
Josh Mason
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Oncentra Prostate Image Fusion
• Multiple image volumes (US, MR, CT)• Rigid fusion (translation, rotation) of any
two image volumes• Automatic, manual and marker based
image fusion
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Import multiple volumes
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6-window layout
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Image overlay
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Split screen view
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Manual fusion
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Marker based fusion
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Automatic fusion
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Points to be aware of
• Default fusion based on centre of volumes • MR slices relocated to transverse position• Internal co-ordinate system• Automatic fusion of US-MR difficult
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Image fusion applications
• MRI guided HDR focal tumour boost• Multi-parametric MRI (T2 weighted, diffusion
weighted and dynamic contrast enhanced) used to delineate tumour volume
• Focal boost dose applied to tumour volume, whole prostate treated to standard dose
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• MR-MR for tumour delineation – Allows multi-parametric MRI overlay, and
corrections for movement/distortion
• MR-US for treatment planning – Allows focal boost dose to target the tumour
in US based treatment planning
• We use manual fusion option for both
Image fusion applications (cont)
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mp-MRI fusion: T2-DWI
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Focal GTV delineation - DWI
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Focal GTV delineation - DCE
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US-MR registration for focal boost
• Structures are associated to the primary volume
• Template not positioned for MRI• => register MR volumes before implant• Prostate moves and deforms during
implant
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Workflow
• Register MR (Pri) to library US (Sec) • => MR contours positioned in template• Re-register MR (Sec) to live US (Pri) after
needle implantation
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MR to library US fusion
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Transfer to secondary
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Live US – MRI fusion
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Live US – MRI fusion
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Focal GTV dose boost