Fixed call to indexing function in makevolume.cc
Fixed call to indexing function in makevolume.cc

sk1712/IRTK,BioMedIA/IRTK,BioMedIA/IRTK,BioMedIA/IRTK,BioMedIA/IRTK,BioMedIA/irtk-legacy,sk1712/IRTK,ghisvail/irtk-legacy,ghisvail/irtk-legacy,sk1712/IRTK,BioMedIA/irtk-legacy,ghisvail/irtk-legacy,BioMedIA/irtk-legacy,BioMedIA/irtk-legacy,ghisvail/irtk-legacy,sk1712/IRTK