, Volume 11, Issue 1, pp 15–21

Measurement of effective atomic number and electron density using an EMI scanner


  • R. A. Rutherford
    • Department of Medical BiophysicsUniversity of Manchester
  • B. R. Pullan
    • Department of Medical BiophysicsUniversity of Manchester
  • I. Isherwood
    • Department of Diagnostic RadiologyUniversity of Manchester

DOI: 10.1007/BF00327253

Cite this article as:
Rutherford, R.A., Pullan, B.R. & Isherwood, I. Neuroradiology (1976) 11: 15. doi:10.1007/BF00327253


Computed tomography, employing an EMI scanner at two beam energies, can be used to obtain information about the electron density and the effective atomic number of materials. The theory which is discussed has been verified experimentally and then applied in the investigation of some brain tumours in vivo. It is anticipated that, as techniques improve, the ability to carry out chemical and physical analysis of pathological processes in vivo will be an important application of computed tomography.

Key words

Computed tomographyEMI scannerElectron densityEffective atomic numberBrain tumour diagnosis

Copyright information

© Springer-Verlag 1976