| 摘要 |
An imaging device for imaging radiation includes an image cell array (16, figure 1). The image cell array includes an array of detector cells 19 which generate charge in response to incident radiation and an array of image cell circuits 20. Each image cell circuit is associated with a respective detector cell. The image cell circuit includes counting circuitry 44 for counting plural radiation hits incident on an associated detector cell, so that counts can be made for each cell in the array individually. The image cell circuit also includes threshold circuitry 42 connected in between each detector and each counting circuit. This receives signals generated in the associated detector cell, the size of which are dependent on the incident radiation energy, and compares these signals with one or more threshold values. The counting circuitry is then connected to the threshold circuitry so that only radiation hits within a predetermined energy range or ranges are counted.
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