Diapositive 1

Other image possibilities

MRI images?

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MRI superior soft tissue contrast

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Lower intraobserver variation

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Smaller margins

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Bulk density assignment?

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Bone must be delineated on the scans

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Doses not as accurate as could be

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DRR’s difficult

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Atlas-based electron density mapping method

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MRI atlas built up from number of patients

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Corresponding CT data sets

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Patient MRI mapped to atlas, same vectors applied to CT Atlas

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PseudoCT and planning CT dose differences 95%

<2%/2mm.

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Full examination of uncertainties needed

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How similar is anatomy of patients?

Dowling IJROBP 83 (2012). Prostate