@misc{indiciaeebf91caaf6c1,
  title = {Validation of the central-ray approximation for attenuated depth-dependent convolution in quantitative SPECT reconstruction.},
  author = {Z Liang and J Cheng and J Ye},
  year = {1997},
  doi = {10.1088/0031-9155/42/2/015},
  url = {https://pubmed.ncbi.nlm.nih.gov/9044425/},
  note = {Source identifier: 9044425}
}