vivo 4dRADPOS is an in vivo dosimetry system that has been recently developed in-house in collaboration with Best Medical Canada [14], [24].It is made up of a MOSFET dosimetermicroscopy for in vivo 4D imaging of zebra fish heart beating Meng Zhang 1 , Renjian Li 1,2 , Songnian Fu 3 , Sunil Kumar 4 , James Mcginty 4 ,YuwenQin 3 and Lingling Chen 2