Progress in Medical Physics

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Fig. 3.

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Fig. 3. Water-pressing cover can be selected for (a) normal incidence setup and (b) oblique incidence setup. Regardless of the water level, the source to surface distance is always constant because of the water-pressing cover. Since the two covers are designed to have the same volume when submerged in water, the water level is the same.
Progress in Medical Physics 2021;32:122-9
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