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Image guided frame-less Stereotactic
Radiotherapy
Replacement!of!the!stereotac9c!!systems!with!external!!
coordinates!for!pa9ent!posi9oning!by!
direct2imaging2
before!the!treatment!and!
online2correc0on2
Use!of!
internal2anatomy2rather2than22external2landmarks22
to!avoid!geographic!miss!
BodaJHeggemann!2006!