Method and system for measuring a molecular array background signal from a continuous background region of specified size
First Claim
1. A method for determining a background signal intensity for a particular feature from a representation of scanned intensity values of a molecular array comprising data points and containing discrete features at specified locations, each feature having a region of interest containing a number of data points, the method comprising:
- specifying a size for a background region corresponding to the feature;
selecting as background data points those data points within the specified background region;
filtering the selected data points to remove all data points that lie within specified locations of features and at least one region of interest of features in the region of specified size for the background region; and
determining the background signal intensity for the particular feature from the filtered, selected data points, wherein background-subtraction of data points from the particular feature using the determined background signal intensity facilitates calculation of accurate and reproducible log ratios between at least one of multi-channel and inter-array data.
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Abstract
A method and system for estimating the background signal over an arbitrarily-sized region of a scanned image of a molecular array, including a background region surrounding the ROI corresponding to the feature. A bit mask is generated, based on a molecular-array, feature-based data set that includes pixel-based intensities and a list of features, including feature coordinates and feature ROI radii, to indicate those pixels in the scanned image of the molecular array corresponding to background, and those pixels in the scanned image of the molecular array corresponding to features and ROIs. An integrated intensity for a background region of arbitrary size and shape can be efficiently determined by selecting pixels within the background region that are indicated to be background pixels in the bit mask. By selecting background anuli of sufficient size to overlap with the background anuli of neighboring features, a relatively continuous function of background-signal-verusus-position can be obtained across the surface of a molecular array in order to examine non-local, background-signal-related phenomena.
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Citations
23 Claims
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1. A method for determining a background signal intensity for a particular feature from a representation of scanned intensity values of a molecular array comprising data points and containing discrete features at specified locations, each feature having a region of interest containing a number of data points, the method comprising:
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specifying a size for a background region corresponding to the feature; selecting as background data points those data points within the specified background region; filtering the selected data points to remove all data points that lie within specified locations of features and at least one region of interest of features in the region of specified size for the background region; and determining the background signal intensity for the particular feature from the filtered, selected data points, wherein background-subtraction of data points from the particular feature using the determined background signal intensity facilitates calculation of accurate and reproducible log ratios between at least one of multi-channel and inter-array data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 19)
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17. A computer readable medium carrying one or more sequences of instructions for determining a background signal intensity for a particular feature from a representation of scanned intensity values of a molecular array comprising data points and containing discrete features at specified locations, each feature having a region of interest containing a number of data points, wherein execution of one or more sequences of instructions by one or more processors causes the one or more processors to perform the steps of:
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selecting as background data points those data points within a specified background region; filtering the selected data points to remove all data points that lie within specified locations of features and at least one region of interest of features in the region of specified size for the background region; and determining the background signal intensity for the particular feature from the filtered, selected data points, wherein background-subtraction of data points from the particular feature using the determined background signal intensity facilitates calculation of accurate and reproducible log ratios between at least one of multi-channel and inter-array data.
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20. A molecular-array-data processing system comprising:
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a computer processor; a communications medium by which molecular array data points are received by the molecular-array-data processing system; one or more memory components that store molecular array data points; and a program, stored in the one or more memory components and executed by the computer processor to perform the following steps receiving specified location of features; specifying a size for a background region corresponding to the feature; selecting as background data points those data points within the specified background region; filtering the selected data points to remove all data points that lie within specified locations of features and at least one region of interest of features in the region of specified size for the background region; and determining the background signal intensity for the particular feature from the filtered, selected data points, wherein background-subtraction of data points from the particular feature using the detennined background signal intensity facilitates calculation of accurate and reproducible log ratios between at least one of multi-channel and inter-array data. - View Dependent Claims (21)
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22. A method for determining a background signal intensity for a particular feature from a representation of scanned intensity values of a molecular array comprising data points and containing discrete features at specified locations, each feature having a region of interest containing a number of data points represented by pixel intensity values associated with pixels in a scanned image of the molecular array, the method comprising:
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specifying size for a background region corresponding to the feature; selecting as background pixels those pixels within the specified background region; filtering the selected pixels to remove all pixels that lie within specified location of features and at least one region of interest of features in the region of specified size for the background region; and determining the background signal intensity for the particular feature from the filtered, selected pixels, wherein background-subtraction of pixels from the particular feature using the determined background signal intensity facilitates calculation of accurate and reproducible log ratios between at least one of multi-channel and inter-array data. - View Dependent Claims (23)
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Specification