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Proceedings Paper

Cascade gamma-gamma tomography and angular correlation measurements
Author(s): Nicholas M. Spyrou; M. Esmail Mesbahi; Stephen N. Mallion
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Paper Abstract

Cascade gamma-ray tomography depends on the measurement of two or more gamma-rays emitted from a radionuclide in coincidence. In using suitable detectors of appropriate timing resolution it may also be possible to obtain information about the 'chemical environment' of the radionuclide i.e. the binding site in the material to which it is attached by carrying out, simultaneously, time differential perturbed angular correlation (TDPAC) measurements. A dual block bismuth germanate (BGO) detector system, designed for use in positron emission tomography (PET) has been employed to perform cascade gamma-ray tomography with a point 60Co source (1173 and 1332 keV). It is shown that despite the poor energy resolution of the coincidence system, the point source can be imaged with a multi-hole collimator, on one or both detectors, with a resolution (full width at half maximum) of 3.8 and 2.4 +/- 0.2 mm respectively, at the expense of significantly reduced sensitivity. Practical constraints limit usefulness of the system which new scintillation systems, with respect to time and energy resolution, should overcome.

Paper Details

Date Published: 25 April 2000
PDF: 8 pages
Proc. SPIE 3977, Medical Imaging 2000: Physics of Medical Imaging, (25 April 2000); doi: 10.1117/12.384531
Show Author Affiliations
Nicholas M. Spyrou, Univ. of Surrey (United Kingdom)
M. Esmail Mesbahi, Univ. of Surrey (United Kingdom)
Stephen N. Mallion, Univ. of Surrey (United Kingdom)

Published in SPIE Proceedings Vol. 3977:
Medical Imaging 2000: Physics of Medical Imaging
James T. Dobbins III; John M. Boone, Editor(s)

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