| 摘要 |
Radiation imaging apparatus includes a substantially tubular body of material capable of producing scintillations in response to bombardment by ionizing radiation and means for converting the scintillations to electrical outputs including a plurality of scintillation sensing units disposed both along and around the outside of the substantially tubular body. A radiation imaging method processes outputs of the scintillation sensing units, which have axial positions and positions relative to first and second coordinates perpendicular to a longitudinal axis of the tubular body. The steps include computing in electrical form a first weighted sum of the outputs of units, the output of each unit being weighted in the sum depending on its position relative to the first coordinate, computing in electrical form a second weighted sum of the outputs of the units, the output of each unit being weighted in the second sum depending on its position relative to the second coordinate, and computing in electrical form a value of position for at least one of the scintillations as a function of the first and second weighted sums for the first and second coordinates.
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