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A novel secure communication network with quantum key distribution in a metropolitan area is reported. Different QKD schemes are integrated to demonstrate secure TV conferencing over a distance 45km, stable long-term operation, and application to secure mobile phones.
We have devised a standardization method for a sealed point source that can be applied to nuclides such as 22Na that emit a positron and at least one gamma ray. This method is based on coincidence counting of annihilation radiation and gamma rays using a scintillation detector array. In the present study, we performed Monte Carlo simulations to examine this method for various measurement conditions...
Objective: In order to improve the convenience and reliability of the calibration procedure with respect to the quantitative aspects of PET scanners, we have been developing new methods that rely on the use of point-like radioactive sources. The aim of this study is to report the results of the application of the proposed method for obtaining the cross-calibration factors (CCFs) of a clinical PET...
In a conventional PET scanner, coincidence events are limited by the energy window for detection of photoelectric events. In contrast, Compton scatter events occur both in a patient and in detector crystals. Scatter events within the patient cause scatter coincidences, but scatter events within crystals have useful information for an activity distribution. The PET scanner with an extended energy window...
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