Cascade gamma-gamma tomography and angular correlation measurements

Nicholas M. Spyrou; M. Esmail Mesbahi; Stephen N. Mallion

doi:10.1117/12.384531

25 April 2000 Cascade gamma-gamma tomography and angular correlation measurements

Nicholas M. Spyrou, M. Esmail Mesbahi, Stephen N. Mallion

Proceedings Volume 3977, Medical Imaging 2000: Physics of Medical Imaging; (2000) https://doi.org/10.1117/12.384531
Event: Medical Imaging 2000, 2000, San Diego, CA, United States

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.

Citation Download Citation

Nicholas M. Spyrou, M. Esmail Mesbahi, and Stephen N. Mallion "Cascade gamma-gamma tomography and angular correlation measurements", Proc. SPIE 3977, Medical Imaging 2000: Physics of Medical Imaging, (25 April 2000); https://doi.org/10.1117/12.384531

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