Summary
Computed tomography provides a measurement of the linear absorption coefficient of material in vivo. The precision and accuracy of the measurements of this parameter made by the EMI scanner have been investigated at all three recommended voltage settings of the machine. The relationship between the EMI number and the linear absorption coefficient was found to be linear despite the polychromatic nature of the X-ray beam. The spatial resolution of the machine and the response to materials at different depths within the section have also been investigated.
Similar content being viewed by others
References
Isherwood, I., Rutherford, R.A., Pullan, B.: Computer Tomography. B. M. J. ii, 746–747 (1975)
Baker, H. L.: The impact of Computed Tomography on Neuroradiologic Practice. Radiology 116, 637–640 (1975)
Rutherford, R.A., Pullan, B.R., Isherwood, I.: Measurement of effective atomic number and electron density using an EMI scanner. Neuroradiology 11, 15–21 (1976)
EMI Ltd. Hayes, Middlesex
Veigele, W.J.: Photon cross-sections from 0.1 keV to 1 MeV for elements Z=1 to Z=94. Atomic Data Tables 5, 51–111 (1973)
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Rutherford, R.A., Pullan, B.R. & Isherwood, I. Calibration and response of an EMI scanner. Neuroradiology 11, 7–13 (1976). https://doi.org/10.1007/BF00327252
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00327252