Methods and apparatus for quantifying color changes induced by specific concentrations of biological analytes
First Claim
1. A computer-implemented method for determining a relative position on a diagnostic instrument, the method comprising:
- capturing a digital image of at least a portion of the diagnostic instrument, which has been exposed to a biological sample, the diagnostic instrument comprising at least one test medium containing a reagent, which changes color in the presence of particular analytes in the biological sample;
scanning the digital image to identify the position of a predetermined region on the diagnostic instrument;
identifying the at least one test medium on the digital image based at least in part on the position of the predetermined region; and
determining a test result by comparing the color of the at least one test medium to a set of possible test medium colors corresponding to predetermined analyte concentrations to determine an analyte concentration of the biological sample being tested.
3 Assignments
0 Petitions
Accused Products
Abstract
Methods and electronic devices for performing color-based reaction testing of biological materials. The method includes capturing and interpreting digital images of an unexposed and later exposed paddle at various delay times within an automatically calibrated environment. The test paddle includes a unique identification mechanism (UID), a Reference Color Bar (RCB) providing samples of standardized colors for image color calibration, compensation and corrections, and several test-specific sequences of Chemical Test Pads (CTP). The method further includes locating the paddle in the image, extracting the UID and validating the paddle, extracting the RCB and locating the plurality of CTP in each image. The method further reduces image noise in the CTP and calibrates the image automatically according to lighting measurements performed on the RCB. To determine test results, the method further determines several distances between the CTP and its possible trajectory in the color space described by the Manufacturer Interpretation Color Chart.
58 Citations
17 Claims
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1. A computer-implemented method for determining a relative position on a diagnostic instrument, the method comprising:
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capturing a digital image of at least a portion of the diagnostic instrument, which has been exposed to a biological sample, the diagnostic instrument comprising at least one test medium containing a reagent, which changes color in the presence of particular analytes in the biological sample; scanning the digital image to identify the position of a predetermined region on the diagnostic instrument; identifying the at least one test medium on the digital image based at least in part on the position of the predetermined region; and determining a test result by comparing the color of the at least one test medium to a set of possible test medium colors corresponding to predetermined analyte concentrations to determine an analyte concentration of the biological sample being tested. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for validating a diagnostic instrument comprising:
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capturing a pre-use digital image of at least a portion of the diagnostic instrument, prior to exposing the diagnostic instrument to a biological sample, the diagnostic instrument comprising at least one color reference comprising a plurality of reference samples of different colors and at least one test medium containing a reagent, which changes color in the presence of particular analytes in the biological sample; identifying the at least one test medium in the pre-use digital image of the diagnostic instrument; comparing a color of the at least one test medium to a set of possible test medium colors for reagents, which have not been exposed to an analyte; and determining whether the diagnostic instrument is in condition for use based at least in part on the color of the at least one test medium. - View Dependent Claims (8, 9, 10, 11)
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12. A diagnostic instrument for identifying a plurality of test results by testing a single patient fluid, the instrument comprising:
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an instrument housing; a color reference comprising a plurality of reference samples of different colors affixed to or associated with the housing for determining the test results from a digital image of the diagnostic instrument; and a plurality of test media affixed to the housing containing color-changing reagents, which change color in the presence of particular analytes in a biological sample. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification