ESTRO course on Image Guided Radiotherapy in Clinical Practice 2018

Margin reduction? Not necessarily !

• Hodgkin Lymphoma, considering daily CBCT and INRT (PET/CT in treatment position)

• Free breathing margins: 1cm all around

• DIBH margins ➢

3mm contouring uncertainty (systematic) 2 mm breath hold uncertainty (random)

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➢ 3 mm image registration/ residual set up error (random)

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Margins = 1 cm !!!

Work in progress, courtesy of Laura Rechner, Rigshospitalet