Patent ID: 8824634

Claim:
An apparatus for sensing a level of ionizing radiation directed through a subject and toward an imaging detector, the apparatus comprising: a panel having a set comprising a two-dimensional array of sensor elements disposed relative to the subject and the imaging detector, wherein each sensor element in the set is individually addressable for providing an indicator signal corresponding to the amount of ionizing radiation received; a control circuit that is in communication with the two-dimensional array of sensor elements and that is responsive to entered instructions: to define one or more composite radiation measurement regions along the panel, wherein each of the one or more composite radiation measurement regions is formed as a proper subset of the set of sensor elements and has two or more sensor elements and has a boundary with respect to the panel; to adjust the boundary of the one or more composite radiation measurement regions within the panel by changing the corresponding proper subset; and to collect the indicator signals from sensor elements in the one or more composite radiation measurement regions and to form an output signal according to the collected indicator signals; and a transmission channel that is in communication with the control circuit and that is energizable to transmit the output signal.