TY - RPRT TI - Fast transmission CT for determining attenuation maps using a collimated line source, rotatable air-copper-lead attenuators and fan-beam collimation. AU - R J Jaszczak AU - D R Gilland AU - M W Hanson AU - S Jang AU - K L Greer AU - R E Coleman PY - 1993 UR - https://pubmed.ncbi.nlm.nih.gov/8355079/ ID - 8355079 ER -