Radiographic imaging device and method with stop timing based on dosage detection
First Claim
1. A radiographic device which is connected to a radiation generation device irradiating a subject with radiation in order to allow communication therebetween and receives the radiation transferred through the subject so as to radiograph a radiological image of the subject, comprising:
- an image detection unit that has an imaging region where a plurality of pixels accumulating signal charges corresponding to a dose of the radiation are arranged and detects the radiological image;
a dose detection unit that detects an arrival dose of the radiation arriving at the imaging region;
a stop timing prediction unit that predicts a stop timing for stopping irradiation of the radiation in the radiation generation device based on the arrival dose detected by the dose detection unit and a preset dose target value in order to prevent excess radiation exposure to the subject; and
a communication unit that sends a stop timing notification for notifying the stop timing to the radiation generation device before the stop timing arrives,wherein the communication unit sends the stop timing notification a predetermined time before the stop timing, the predetermined time being set in consideration of a time lag of communication with the radiation generation device, andwherein a time lag of the communication is an average time lag derived from multiple measurement points according to a communication path with the radiation generation device.
1 Assignment
0 Petitions
Accused Products
Abstract
An AEC unit of an electronic cassette sets a dose target value and a short-circuited pixel used for AEC based on a radiographing condition. When a control unit of the electronic cassette detects start of irradiation of X rays, the AEC unit starts integration of a cumulative dose of X rays which are incident to a target region based on a dose detection signal output by the short-circuited pixel. The AEC unit predicts a stop timing at the time point t1, waits until the time point t2 which is a predetermined time earlier than a scheduled stop time, and sends a stop timing notification to an X-ray generation device at the time point t2. When the stop timing notification is received, a X-ray source control device immediately inputs an irradiation stop command so as to stop an operation of an X-ray source.
28 Citations
25 Claims
-
1. A radiographic device which is connected to a radiation generation device irradiating a subject with radiation in order to allow communication therebetween and receives the radiation transferred through the subject so as to radiograph a radiological image of the subject, comprising:
-
an image detection unit that has an imaging region where a plurality of pixels accumulating signal charges corresponding to a dose of the radiation are arranged and detects the radiological image; a dose detection unit that detects an arrival dose of the radiation arriving at the imaging region; a stop timing prediction unit that predicts a stop timing for stopping irradiation of the radiation in the radiation generation device based on the arrival dose detected by the dose detection unit and a preset dose target value in order to prevent excess radiation exposure to the subject; and a communication unit that sends a stop timing notification for notifying the stop timing to the radiation generation device before the stop timing arrives, wherein the communication unit sends the stop timing notification a predetermined time before the stop timing, the predetermined time being set in consideration of a time lag of communication with the radiation generation device, and wherein a time lag of the communication is an average time lag derived from multiple measurement points according to a communication path with the radiation generation device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. A radiographic system comprising:
-
a radiation generation device that irradiates a subject with radiation; and a radiographic device that is connected to the radiation generation device in order to allow communication therebetween and receives the radiation transferred through the subject so as to radiograph a radiological image of the subject, wherein the radiographic device includes an image detection unit that includes an imaging region where a plurality of pixels accumulating signal charges corresponding to a dose of the radiation are arranged and detects the radiological image; a dose detection unit that detects an arrival dose of the radiation arriving at the imaging region; a stop timing prediction unit that predicts a stop timing for stopping irradiation of the radiation in the radiation generation device based on the arrival dose detected by the dose detection unit and a preset dose target value in order to prevent excess radiation exposure to the subject; and a communication unit that sends a stop timing notification for notifying the radiation generation device of the stop timing to the radiation generation device before the stop timing arrives, wherein the communication unit sends the stop timing notification a predetermined time before the stop timing, the predetermined time being set in consideration of a time lag of communication with the radiation generation device, wherein a time lag of the communication is an average time lag derived from multiple measurement points according to a communication path with the radiation generation device, and wherein the radiation generation device includes a radiation source that applies the radiation; and a radiation source control unit that controls the radiation source, wherein the radiation source control unit includes a communication unit that receives the stop timing notification; and a control unit that stops irradiation by the radiation source based on the stop timing notification. - View Dependent Claims (20, 21, 22, 23)
-
-
24. A control method for a radiographic device which is connected to a radiation generation device irradiating a subject with radiation in order to allow communication therebetween and includes an image detection unit provided with an imaging region where a plurality of pixels accumulating signal charges corresponding to a dose of the radiation are arranged and receiving the radiation transferred through the subject so as to detect a radiological image of the subject, comprising:
-
a dose detection step of detecting an arrival dose of the radiation arriving at the imaging region; a stop timing prediction step of predicting a stop timing for stopping irradiation of the radiation in the radiation generation device based on the detected arrival dose and a preset dose target value in order to prevent excess radiation exposure to the subject; and a communication step of sending a stop timing notification for notifying the radiation generation device of the stop timing to the radiation generation device before the stop timing arrives wherein the communication step sends the stop timing notification a predetermined time before the stop timing, the predetermined time being set in consideration of a time lag of communication with the radiation generation device, and wherein a time lag of the communication is an average time lag derived from multiple measurement points according to a communication path with the radiation generation device.
-
-
25. A non-transitory computer readable recording medium recording thereon a control program for a radiographic device which is connected to a radiation generation device irradiating a subject with radiation in order to allow communication therebetween and includes an image detection unit provided with an imaging region where a plurality of pixels accumulating signal charges corresponding to a dose of the radiation are arranged and receiving the radiation transferred through the subject so as to detect a radiological image of the subject, the control program causing a computer to function as:
-
a dose detection unit that detects an arrival dose of the radiation arriving at the imaging region; a stop timing prediction unit that predicts a stop timing for stopping irradiation of the radiation in the radiation generation device based on the arrival dose detected by the dose detection unit and a preset dose target value in order to prevent excess radiation exposure to the subject; and a communication unit that sends a stop timing notification for notifying the radiation generation device of the stop timing to the radiation generation device before the stop timing arrives, wherein the communication unit sends the stop timing notification a predetermined time before the stop timing, the predetermined time being set in consideration of a time lag of communication with the radiation generation device, and wherein a time lag of the communication is an average time lag derived from multiple measurement points according to a communication path with the radiation generation device.
-
Specification