Method for automated radiographic quality assurance
First Claim
1. A computer implemented method for determining film density quality of a clinical radiographic image on an exposed radiographic film comprising the steps of:
- exposing a radiographic film to form a radiographic image;
digitizing said radiographic image to form a digital image of said radiographic image, said digital image comprising a plurality of pixels;
storing said digital image in a memory;
assigning a grey level value to each of said plurality of pixels based on a relative darkness of each said pixel;
generating a grey level histogram of said digital image based on said assigned grey level values;
storing said grey level histogram in a memory;
generating at least one binned grey level histogram of said digital image based on said assigned grey level values;
storing said at least one binned grey level histogram in a memory; and
determining a quality classification of said radiographic image based on an evaluation of said binned grey level histogram of said digital image;
wherein the step of generating said at least one binned grey level histogram comprisesretrieving said grey level histogram from memory;
summing a number of pixels of said digital image having grey level values in a first range, said first range being defined as a dark range;
summing a number of pixels of said digital image having grey level values in a second range, said second range being defined as an intermediate range;
summing a number of pixels of said digital image having grey level values in a third range, said third range being defined as a light range;
said first binned histogram reflecting relative percentages of the numbers of pixels of the digital images in each of said first, second and third ranges; and
storing said first binned histogram in a memory.
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Accused Products
Abstract
A method for quantitatively evaluating the quality of radiographic films is disclosed. The method provides for digitizing a radiographic image to form a digital image made up of a plurality of pixels. The individual pixels of the digitized image are assigned grey level values. These grey level values are summed to form a global histogram representing all of the pixels of the digital image. The histogram is subsequently binned and subdivided to form first and second binned histograms. A series of rules is applied to these histograms to evaluate whether the radiographic film is clinically acceptable for use in making a diagnosis.
49 Citations
7 Claims
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1. A computer implemented method for determining film density quality of a clinical radiographic image on an exposed radiographic film comprising the steps of:
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exposing a radiographic film to form a radiographic image; digitizing said radiographic image to form a digital image of said radiographic image, said digital image comprising a plurality of pixels; storing said digital image in a memory; assigning a grey level value to each of said plurality of pixels based on a relative darkness of each said pixel; generating a grey level histogram of said digital image based on said assigned grey level values; storing said grey level histogram in a memory; generating at least one binned grey level histogram of said digital image based on said assigned grey level values; storing said at least one binned grey level histogram in a memory; and determining a quality classification of said radiographic image based on an evaluation of said binned grey level histogram of said digital image;
wherein the step of generating said at least one binned grey level histogram comprisesretrieving said grey level histogram from memory; summing a number of pixels of said digital image having grey level values in a first range, said first range being defined as a dark range; summing a number of pixels of said digital image having grey level values in a second range, said second range being defined as an intermediate range; summing a number of pixels of said digital image having grey level values in a third range, said third range being defined as a light range; said first binned histogram reflecting relative percentages of the numbers of pixels of the digital images in each of said first, second and third ranges; and storing said first binned histogram in a memory. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification