Method and system for localization of inter-rib spaces and automated lung texture analysis in digital chest radiographs
First Claim
1. A method for automated analysis of lung texture in a radiographic chest image, comprising:
- obtaining digital image data representative of said image;
selecting at least one region of interest (ROI) in said image for analysis;
removing background trend due to the gross anatomy of the lung and chest wall from the image data corresponding to said ROI and thereby producing corrected image data, representative of fluctuating patterns of the underlying lung texture, in which the background trend is removed;
processing the corrected image data to extract predetermined characteristics therefrom for evaluation.
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Abstract
A method and system for automated analysis of digital radiographic images in which regions-of-interest (ROI'"'"'s) are first determined, and subsequently analyzed for abnormalities. To locate the ROI'"'"'s, the outer ribcage and midline boundary locations of the chest image are determined from the digital image data. Vertical profiles are then selected and background trend is then removed from each vertical profile. A shift-variant sinusoidal function is fitted to each vertical profile and ROI'"'"'s are selected based on the fitted functions. The non-uniform background trend is removed from the original image data of each selected ROI to obtain corrected data. The power spectrum of the lung texture is obtained from the 2D Fourier transform of the corrected data and is filtered by the human visual response. Finally, the root-mean-square (rms) variation, R, and the first moment of the power spectrum, M, are determined as quantitative texture measures for the magnitude and coarseness (or fineness), respectively, of the lung texture.
112 Citations
62 Claims
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1. A method for automated analysis of lung texture in a radiographic chest image, comprising:
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obtaining digital image data representative of said image; selecting at least one region of interest (ROI) in said image for analysis; removing background trend due to the gross anatomy of the lung and chest wall from the image data corresponding to said ROI and thereby producing corrected image data, representative of fluctuating patterns of the underlying lung texture, in which the background trend is removed; processing the corrected image data to extract predetermined characteristics therefrom for evaluation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method for selecting at least one region of interest (ROI) for analysis of lung texture in a radiographic chest image, comprising:
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obtaining digital image data representative of said image; boundary processing said digital image data to derive ribcage edge and midline boundaries; deriving at least one vertical profile at a predetermined location in relation to the ribcage edge and midline boundaries derived in said boundary processing step; removing background trend from the at least one vertical profile to obtain vertical profile corrected (VPC) data; selecting said at least one ROI based on said VPC data. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33)
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34. A system for automated analysis of lung texture in a radiographic chest image, comprising:
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means for obtaining digital image data representative of said image; means for selecting at least one region of interest (ROI) in said image for analysis; means for removing background trend due to the gross anatomy of the lung and chest wall from the image data corresponding to said ROI and thereby producing corrected image data, representative of fluctuating patterns of the underlying lung texture, in which the background trend is removed; processing means for extracting from the corrected image data predetermined characteristics for evaluation. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
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55. A system for selecting at least one region of interest (ROI) for analysis of lung texture in a radiographic chest image, comprising:
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means for obtaining digital image data representative of said image; boundary processing means for deriving from said digital image data ribcage edge and midline boundaries; means for deriving at least one vertical profile at a predetermined location in relation to the ribcage edge and midline boundaries derived by said boundary processing means; means for removing background trend from the at least one vertical profile to obtain vertical profile corrected (VPC) data; and means for selecting said at least one ROI based on said VPC data. - View Dependent Claims (56, 57, 58, 59, 60, 61, 62)
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Specification