Exposure control using digital radiography detector
First Claim
1. A method for sensing a level of ionizing radiation directed from a radiation source through a subject and toward a digital radiography detector, the method executed at least in part by a logic processor and comprising:
- obtaining image data that relates the position of the subject to the digital radiography detector;
assigning one or more radiant-energy sensing elements of the digital radiography detector as one or more exposure control sensing elements, according to the obtained image data;
sampling the one or more exposure control sensing elements one or more times during exposure to measure the exposure directed to the subject; and
providing a signal to terminate exposure according to exposure measurements obtained from the one or more exposure control sensing elements within the digital radiography detector.
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Abstract
A method for sensing a level of ionizing radiation directed from a radiation source through a subject and toward a digital radiography detector, executed at least in part by a logic processor, obtains image data that relates the position of the subject to the digital radiography detector and assigns one or more radiant-energy sensing elements of the digital radiography detector as one or more exposure control sensing elements. The one or more exposure control sensing elements are sampled one or more times during exposure to measure the exposure directed to the subject. A signal is provided to terminate exposure according to exposure measurements obtained from the one or more exposure control sensing elements within the digital radiography detector.
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Citations
19 Claims
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1. A method for sensing a level of ionizing radiation directed from a radiation source through a subject and toward a digital radiography detector, the method executed at least in part by a logic processor and comprising:
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obtaining image data that relates the position of the subject to the digital radiography detector; assigning one or more radiant-energy sensing elements of the digital radiography detector as one or more exposure control sensing elements, according to the obtained image data; sampling the one or more exposure control sensing elements one or more times during exposure to measure the exposure directed to the subject; and providing a signal to terminate exposure according to exposure measurements obtained from the one or more exposure control sensing elements within the digital radiography detector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A radiographic imaging detector comprising:
a set of radiant-energy sensing elements including a first imaging subset of radiant-energy sensing elements for imaging pixels and a second exposure termination subset of radiant-energy sensing elements to output exposure measurement signals, where different groups of the set of radiant-energy sensing elements of the radiographic imaging detector are selected as the second exposure termination subset of radiant-energy sensing elements according to image content that relates the position of the subject to the radiographic imaging detector, where a first group of the radiant-energy sensing elements is selected as the second exposure termination subset of radiant-energy sensing elements for a first radiographic image and a second group of the radiant-energy sensing elements is selected as the second exposure termination subset of radiant-energy sensing elements for a second radiographic image, where the first group of the radiant-energy sensing elements is different from the second group of the radiant-energy sensing elements. - View Dependent Claims (12, 13, 14)
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15. A radiographic imaging apparatus for obtaining a radiographic image of a subject, the imaging apparatus comprising:
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a radiation source that is energizable to generate pulsed ionizing radiation; a radiographic imaging detector disposed in the path of the radiation to form the radiographic image of the subject according to the ionizing radiation received, the radiographic imaging detector having a first subset of radiant-energy sensing elements that provide an image and a second subset of radiant-energy sensing elements that provide one or more output signals that are used for exposure measurement and termination, wherein the first and second subsets are of a variable size and the size is adjustable for the radiographic image, where a first portion of the second subset is selected for a first radiographic image and a second portion of the second subset is selected for a second radiographic image, where the first portion and the second portion are different portions of the second subset; and a control logic circuit that receives the one or more output signals from the second subset of radiant-energy sensing elements and generates a termination signal according to the received output signals. - View Dependent Claims (16, 17, 18, 19)
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Specification