Patent ID: 9234966
Filing Date: 2016-01-12
CPC Classification: A61B,G01T,H01L,H04N

Claim Text:
1. A radiation imaging apparatus comprising: a plurality of pixels each including a conversion element configured to convert radiation into charge and a switching element configured to transfer an electrical signal based on the charge; a plurality of driving lines respectively connected to different switching elements of said plurality of switching elements; a driving circuit configured to apply conductive voltage to said plurality of driving lines to set said switching elements in a conductive state; bias lines for applying bias voltage to said conversion elements of said plurality of pixels to make said conversion elements convert radiation into charge; an acquisition unit configured to perform an acquisition process of an evaluation value based on a current flowing in one bias line of said bias lines while said driving circuit is applying the conductive voltage to said plurality of driving lines; a determination unit configured to perform a determination process of comparing the evaluation value with a comparison target value to determine whether radiation is being irradiated onto said conversion elements; a control unit configured to control said acquisition unit and said determination unit to perform the acquisition process and the determination process a plurality of times; and a storage unit configured to store the evaluation value used in the determination process, wherein a comparison target value used in a given determination process is based on one or more evaluation values used in one or more determination processes which are performed before the given determination process and in which it is determined that radiation has not been irradiated.