Patent ID: 7302039
Filing Date: 2007-11-27
Classification: G01N,G01T,H04N

Abstract:
1. A radiography apparatus, comprising: a conversion circuit unit including a plurality of conversion elements arranged in a row-column pattern and configured to convert radiations into an electrical signal; a drive circuit configured to control the driving of the conversion circuit unit; a reading circuit configured to read the electrical signal outputted from the conversion circuit unit; and a signal-processing unit configured to process the electrical signal outputted from the reading circuit, wherein, in an object-image reading operation, the conversion circuit unit detects an object image based on illuminated radiations, and the drive circuit drives the conversion circuit unit so as to allow the reading circuit to read a signal based on the object image, and, in an offset-data reading operation, the conversion circuit unit detects offset data in a period where the radiations are not illuminating, and the reading circuit reads a signal based on the offset data, and wherein, when the numbers of lines driven concurrently by the drive circuit in the object-image reading operation is represented by n (equal to 1 or greater) and the numbers of lines driven concurrently by the drive circuit in offset-data reading operation is represented by m, the drive circuit controls the conversion circuit unit so as to satisfy the expression: n<m.