| CPC G21K 1/04 (2013.01) [A61B 6/06 (2013.01)] | 18 Claims |

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1. A collimator comprising:
an adjustable aperture; and
a first pair of knobs configured to adjust a size of the adjustable aperture by manipulating one or both of the first pair of knobs;
wherein the first pair of knobs are attached at opposite sides of the collimator, and
wherein each of the first pair of knobs is configured to adjust a different dimension of the adjustable aperture.
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