| 摘要 |
A high sensitivity radiation imaging system, aimed to perform sections (or tomographic) images of emitted radiation. This system includes a collimator having at least two openings in which the narrowest cross-section is greater than twice the intrinsic resolution of the detector so that different points of radiation impact can be detected in each opening. The plurality of openings differs in shapes, dimensions or orientations in order to provide a better overlap of their impulse function in the Fourier space. The camera head is displaced by successive steps, the successive steps being of the order of magnitude of a predetermined image resolution. Information collected by the detector is processed by storing locating information corresponding of the impact points for each position of the openings during displacement, and processing the information to reconstruct the radiation volume density function. The combination of the various impulse functions related to the different openings allows a full coverage of the Fourier space, thus resulting in high resolution of reconstructed images. This resolution is then independent of the size of the holes allowing the use of large openings resulting in a high sensitivity.
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