| CPC G01T 1/17 (2013.01) [G01T 7/00 (2013.01)] | 20 Claims |

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1. An apparatus comprising:
a plurality of pixels each including a conversion element; and
a shielding layer covering the conversion element,
wherein the shielding layer is provided to cover at least a part of an aperture of the conversion element so that an aperture modulated transfer function (MTF) at a predetermined frequency of a signal obtained from the conversion element becomes less than or equal to a predetermined value.
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