| abstract |
A multimodal fiducial marker ( 10 ) for registration of data is disclosed. The multimodal fiducial marker ( 10 ) generally comprises a first portion ( 12 ) made from at least one radiopaque material and a second portion ( 14 ) made from a porous material capable of absorbing at least one radioactive material. The second portion ( 14 ) at least partially surrounds the first portion ( 12 ). |