Method for dynamic range management of digital radiographic images
First Claim
1. In an X-ray imaging system comprising an X-ray source, a digital X-ray detector and a digital display device, a method for establishing a dynamic range for said display device comprising the steps of:
- operating said detector to provide a set of count values representing X-ray image data acquired by said detector from an object of imaging;
applying a specified analytical function to said set of count values to generate a set of optical density values which collectively define an optical density range; and
mapping said optical density range to the dynamic range of said display device.
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Abstract
In an X-ray imaging system comprising an X-ray source, a digital X-ray detector and a display device, an arrangement is provided for setting or establishing the dynamic range of the image at the display device. The detector is operated to provide a set of count values representing X-ray image data acquired by the detector from an object of imaging, and a set of standardized values, such as optical density values, is derived from the count values. The optical density values collectively define a range of optical density values, and the dynamic range of the display device is mapped thereto. The display device is enabled to present an image of the object which appears similar to or substantially the same as an image of the object presented by, for example, a specified analog X-ray film.
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Citations
20 Claims
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1. In an X-ray imaging system comprising an X-ray source, a digital X-ray detector and a digital display device, a method for establishing a dynamic range for said display device comprising the steps of:
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operating said detector to provide a set of count values representing X-ray image data acquired by said detector from an object of imaging;
applying a specified analytical function to said set of count values to generate a set of optical density values which collectively define an optical density range; and
mapping said optical density range to the dynamic range of said display device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. In an X-ray imaging system comprising an X-ray source, a digital X-ray detector and a digital display device, a method for establishing a dynamic range for said display device comprising the steps of:
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acquiring a set of count values representing X-ray image data from an object of imaging;
applying a specified analytical function to said set of count values to generate a set of standardized values; and
mapping the standardized values to the dynamic range of said display device - View Dependent Claims (10)
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11. In an X-ray imaging system comprising an X-ray source, a digital X-ray detector disposed to provide count values representing detected X-radiation, and a digital display device, a method for establishing the dynamic range of said display device comprising the steps of:
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initially operating said system to determine the particular count value which is provided by said digital detector when a known X-ray dose is applied thereto, said known X-ray dose being associated with a specified analog X-ray film having a corresponding H-D curve;
operating said detector to provide a set of count values representing X-ray image data acquired by said detector from an object of imaging;
deriving a functional relationship between optical density and count values from said particular count value, and from said H-D curve of said specified analog film;
applying said functional relationship to said set of count values to generate a set of optical density values which collectively define an optical density range; and
mapping said optical density range to the dynamic range of said display device. - View Dependent Claims (12, 13, 14)
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15. An X-ray imaging system comprising:
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an X-ray source;
a digital X-ray detector disposed to provide a set of count values representing X-ray image data acquired by said detector from an object of imaging;
a digital display device coupled to said detector; and
a processor disposed to receive said count values and to generate a set of optical density values in response thereto, said optical density values being functionally related to said count values and the minimum and maximum optical density values collectively defining an optical density range, said processor being further disposed to map said optical density range to the dynamic range of said display device. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification