We have demonstrated the feasibility of semiconductor Compton cameras for multiple molecular imaging in nuclear medicine. The Compton camera used in this work comprises two double-sided orthogonal-strip germanium detectors, and their excellent energy resolution enabled discrimination of the nuclides and accurate determination of the scattering angle for g rays in wide energy range. Three radioactive tracers of 65 ZnCl 2 , 85 SrCl 2 , and iodinated ( 131 I) methylnorcholestenol were injected to a living mouse and were measured simultaneously. Both two-and three-dimensional images of each tracer were obtained by a fixed-angle imaging with a single Compton camera, which reflected the different in vivo behavior of them.

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A method to measure wideband permeability was developed for 5-mm-square magnetic thin film from 0.1 to 10GHz by using a shielded short-circuited microstrip line as the test fixture. The S11 parameters of the test fixturewere measured with a vector network analyzer (VNA). The permeability was derived, based on the lumped element approximation, by comparing S11s with S11os which corresponded to without and with a strong magnetic field parallel to the microwave magnetic field caused by the microstrip line. In this case, the influence of substrate on which the thin film prepared could not be neglected due to the small gap between the microstrip line and the substrate. We introduced a method to derive an effective permittivity e caused by the substrate by comparing S11o of blank fixture with S11os of fixture with sample under a strong static magnetic field. We also propose a method of determining whether the lumped element approximation is valid or not.