Radiation imaging apparatus and control method thereof, and radiation imaging system
First Claim
1. A radiation imaging apparatus that performs main imaging for taking a radiographic image for use in diagnosis and preliminary imaging prior to said main imaging for determining a main exposure condition being an exposure condition used in said main imaging, said radiation imaging apparatus comprising:
- a radiation image detecting device having a detection panel having an arrangement of a plurality of pixels each for receiving radiation emitted from a radiation source and passed through an imaged portion;
a dose detection sensor for detecting a received radiation dose passed through said imaged portion;
an automatic exposure controller for comparing an integral value of said received radiation dose with a predetermined threshold value, and automatically stopping emission of said radiation from said radiation source in said preliminary imaging if said integral value has reached said threshold value; and
a main exposure condition determination unit for determining said main exposure condition based on said integral value of said received radiation dose detected during said preliminary imaging and a necessary radiation dose required for ensuring image quality of said radiographic image, said main exposure condition including a main irradiation time being an irradiation time with said radiation during said main imaging or a main time-current product being a time-current product used during said main imaging, said main imaging being carried out with use of said determined main exposure condition.
1 Assignment
0 Petitions
Accused Products
Abstract
Besides normal pixels, a plurality detection pixels are arranged in an imaging surface of an FPD. In preliminary imaging, X-rays are emitted to an imaged body portion of a patient. The detection pixels receive the X-rays passed through the body portion, and output AEC detection signals. If an integral value of the AEC detection signals has reached a threshold value, X-ray emission is stopped and the preliminary imaging is completed. A main exposure condition determination unit determines a main irradiation time, being an irradiation time with the X-rays during the main imaging, based on an irradiation time with the X-rays during the preliminary imaging and the integral value of the AEC detection signals. The main imaging is performed using the main irradiation time. The normal pixels continue a charge accumulation operation over the preliminary imaging and the main imaging to produce an X-ray image for use in diagnosis.
22 Citations
15 Claims
-
1. A radiation imaging apparatus that performs main imaging for taking a radiographic image for use in diagnosis and preliminary imaging prior to said main imaging for determining a main exposure condition being an exposure condition used in said main imaging, said radiation imaging apparatus comprising:
-
a radiation image detecting device having a detection panel having an arrangement of a plurality of pixels each for receiving radiation emitted from a radiation source and passed through an imaged portion; a dose detection sensor for detecting a received radiation dose passed through said imaged portion; an automatic exposure controller for comparing an integral value of said received radiation dose with a predetermined threshold value, and automatically stopping emission of said radiation from said radiation source in said preliminary imaging if said integral value has reached said threshold value; and a main exposure condition determination unit for determining said main exposure condition based on said integral value of said received radiation dose detected during said preliminary imaging and a necessary radiation dose required for ensuring image quality of said radiographic image, said main exposure condition including a main irradiation time being an irradiation time with said radiation during said main imaging or a main time-current product being a time-current product used during said main imaging, said main imaging being carried out with use of said determined main exposure condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A control method of a radiation imaging apparatus that performs main imaging for taking a radiographic image for use in diagnosis and preliminary imaging prior to said main imaging for determining a main exposure condition being an exposure condition used in said main imaging, said control method comprising the steps of:
-
emitting radiation from a radiation source to an imaged portion in said preliminary imaging; detecting a radiation dose received in a radiation image detecting device through said imaged portion; comparing an integral value of said received radiation dose with a predetermined threshold value; automatically stopping emission of said radiation from said radiation source and completing said preliminary imaging, if said integral value has reached said threshold value; determining said main exposure condition based on said integral value of said received radiation dose detected during said preliminary imaging and a necessary radiation dose required for ensuring image quality of said radiographic image, said main exposure condition including a main irradiation time being an irradiation time with said radiation during said main imaging or a main time-current product being a time-current product used during said main imaging; and carrying out said main imaging with use of said determined main exposure condition. - View Dependent Claims (14)
-
-
15. A radiation imaging system that performs main imaging for taking a radiographic image for use in diagnosis and preliminary imaging prior to said main imaging for determining a main exposure condition being an exposure condition used in said main imaging, said radiation imaging system comprising:
-
a radiation generating apparatus for emitting radiation to an imaged portion; a radiation image detecting device having a detection panel having an arrangement of a plurality of pixels each for receiving said radiation passed through said imaged portion; a dose detection sensor for detecting a received radiation dose passed through said imaged portion; a timer for measuring a preliminary irradiation time being an irradiation time with said radiation during said preliminary imaging; an automatic exposure controller for comparing an integral value of said received radiation dose with a predetermined threshold value, and automatically stopping emission of said radiation from said radiation generating apparatus in said preliminary imaging if said integral value has reached said threshold value; and a main exposure condition determination unit for determining said main exposure condition based on said integral value of said received radiation dose detected during said preliminary imaging, said preliminary irradiation time, and a necessary radiation dose required for ensuring image quality of said radiographic image, said main exposure condition including a main irradiation time being said irradiation time with said radiation during said main imaging or a main time-current product being a time-current product used during said main imaging, said main imaging being carried out with use of said determined main exposure condition.
-
Specification