| 摘要 |
The present invention relates to a method an arrangement in an x-ray imaging apparatus (10), comprising at least one x-ray source (11), a collimator (42, 52, 62a, 62b, 72) and a registering means (43, 73), the arrangement is arranged for providing a variable exposure of said registering means (43, 73) to x-ray radiation from said x-ray source (10) through slots (45, 55, 65a, 65b, 75) on said collimator (42, 52, 62a, 62b, 72). Said arrangement comprises at least one of said collimator (42, 52, 62a, 62b, 72) or registering means (43, 73), which are arranged moveable relative each other to vary number of x-rays registered by said registering means.
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