| US 7,532,706 B2 | ||
| Imaging apparatus, imaging system, imaging method, and computer program | ||
| Toshio Kameshima, Kumagaya (Japan); Tadao Endo, Honjo (Japan); Tomoyuki Yagi, Honjo (Japan); and Katsuro Takenaka, Kodama-gun (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Dec. 27, 2005, as Appl. No. 11/319,910. | ||
| Application 11/319910 is a continuation of application No. PCT/JP2005/014436, filed on Aug. 05, 2005. | ||
| Claims priority of application No. 2004-231446 (JP), filed on Aug. 06, 2004; and application No. 2005-226622 (JP), filed on Aug. 04, 2005. | ||
| Prior Publication US 2006/0104417 A1, May 18, 2006 | ||
| Int. Cl. H05G 1/64 (2006.01); H05G 1/58 (2006.01); H03G 3/00 (2006.01); H01L 27/146 (2006.01) | ||
| U.S. Cl. 378—98 [378/116; 250/214 AG; 250/370.09] | 15 Claims |
| 1. An imaging apparatus comprising:
an imaging unit having a plurality of conversion elements, said imaging unit being configured to obtain an image signal according
to a radiation dose transmitted through an object; and
a gain correction unit which corrects, in order to correct gain characteristics of the plurality of conversion elements, an
image signal from said imaging unit using a correction signal stored on a storage medium, the gain characteristics being input/output
characteristics of each of the plurality of conversion elements, the input/output characteristics being a relation between
the number of photons or radiation dose incident on each of the plurality of conversion elements and charge amount or output
signal amount generated in each of the plurality of conversion elements according to the number of photons or radiation dose,
the correction signal being a signal obtained from said imaging unit by a radiation irradiation on said imaging unit without
an object between a radiation generating device and said imaging unit,
wherein said gain correction unit is arranged to select a correction signal corresponding to a radiographic mode from a plurality
of correction signals corresponding to a plurality of radiographic modes between which a radiation dose to said imaging unit
in order to obtain the image signal for one image differs, and correct the image signal in the radiographic mode by performing
division for the image signal and the selected correction signal.
|