remove unused data structure
remove unused data structure

sdimoudi/bart,mrirecon/bart,mrirecon/bart,sdimoudi/bart,Takishima/bart,sidward/bart,Takishima/bart,sidward/bart,sdimoudi/bart,sdimoudi/bart,Takishima/bart,mrirecon/bart,mrirecon/bart,mrirecon/bart,Takishima/bart,sdimoudi/bart,sidward/bart,sidward/bart,sidward/bart,Takishima/bart