TY  - RPRT
TI  - The geometric transfer function for cone and fan beam collimators.
AU  - B M Tsui
AU  - G T Gullberg
PY  - 1990
DO  - 10.1088/0031-9155/35/1/008
UR  - https://pubmed.ncbi.nlm.nih.gov/2304971/
ID  - 2304971
ER  -