IMPROVISED RADIOTHERAPY TECHNIQUES IN TELE COBALT WITHOUT MLC

IMPROVISED BEAM MODIFICATION TECHNIQUES IN TELECOBALT - A Feasibility Study A comparison between cobalt and linear accelerator-based IMRT treatment plans ,[object Object],[object Object],[object Object],[object Object],BOG 24June2011 Presentation

Investigating team (Co-investigators) ,[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],INTRODUCTION

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Recent advances in -

3DCRT/IMRT/IGRT ,[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object]

2 D planning systems ,[object Object]

Most often in our routine clinical practice: - ,[object Object],[object Object],[object Object],[object Object]

RATIONALE FOR THE STUDY ,[object Object],[object Object]

[object Object],[object Object],[object Object],MATERIALS & METHODS

Mould room techniques ,[object Object],[object Object],[object Object],[object Object]

CT simulation ,[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],Machine

CT TPS ,[object Object],[object Object]

Virtual Simulation ,[object Object],[object Object],[object Object],[object Object],[object Object]

TPS Planning Process ,[object Object],[object Object],[object Object],[object Object]

Conformal Radiation ,[object Object],[object Object],[object Object],Geometrical Field shaping Geometrical Field shaping with Intesity Modulation

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Improvisation of 3D plan

[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Case 1 ,[object Object],[object Object],[object Object],[object Object],[object Object]

Conventional 3 D Plan : Filed AP & 2 Lateral with shield

Improvised 3D Plan for Telecobalt

IMRT Plan : 95% isodose covering PTV Cobalt Plan: 90% isodose covering TV

IMRT Plan: Good coverage in other sections Cobalt Plan: Slight dipping of isodose lines near the lt eye due to fixed shielding block , can be improved with Cerrobent blocks

DVH : Cobalt plan has comparatively similar DVHG to IMRT with considerable normal issue low doses

Comparison of Mean Dose to PTV and adjacent Normal tissue

RT Technique used: Fields, Sub Fields and Shielded Zones: 8 Field

Field Positions: AP(2), RAO, LAO, Rt Lat (2), Lt Lat(2)

Plan Implementation and Treatment Delivery Verification

Setup Time ,[object Object],[object Object],[object Object]

CASE 2 ,[object Object],[object Object]

CONCLUSION ,[object Object],[object Object],[object Object],[object Object]

IMPROVISED RADIOTHERAPY TECHNIQUES IN TELE COBALT WITHOUT MLC

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IMPROVISED RADIOTHERAPY TECHNIQUES IN TELE COBALT WITHOUT MLC