Collimator is an important equipment in gamma scanning system. Visual field and measurement uniformity are important metric on properties of collimator. This paper studied the influence of the collimator shape and size on the visual field and measurement uniformity. The small and large square windows were not the optimal. Comparing those properties, a special shape collimator was introduced in this research. By contrast, its properties were improved. Then, we made several groups of experiments with the orthogonal experimental design, and discussed the effect of size parameters on the visual field and measurement uniformity. The length of the collimator is the most important factor. The influence of size parameters is the same on measurement uniformity. Then, we obtained the optimal size parameters.

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