Diagnosis of dysplasia using laser induced fluoroescence
First Claim
1. An in vivo method of detecting tissue abnormality in a diagnostic cervical tissue sample in a patient, comprising:
- illuminating the diagnostic cervical tissue sample and a presumptively histologically normal cervical tissue sample with electromagnetic radiation;
detecting a first fluorescence intensity spectrum from the diagnostic tissue sample;
detecting a second fluorescence intensity spectrum from the presumptively histologically normal cervical tissue sample;
calculating from a predetermined portion of said first fluorescence intensity spectrum, a first slope parameter which is indicative of tissue abnormality;
calculating from a predetermined portion of said second fluorescence intensity spectrum, a second slope parameter which is indicative of presumptively histologically normal cervical tissue; and
detecting tissue abnormality in the diagnostic cervical tissue sample as a function of said first and second slope parameters.
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Accused Products
Abstract
Apparatus and in vivo methods to distinguish normal and abnormal cervical tissue and to detect cervical intraepithelial neoplasia (CIN) in a diagnostic cervical tissue sample. Induced fluorescence intensity spectra from known normal cervical tissue and a diagnostic tissue sample are obtained from the same patient. Peak fluorescence intensity values for normal tissue samples are averaged, as are slope measurements from predetermined portions of spectra induced in both known normal cervical tissue and the diagnostic tissue sample. Peak fluorescence intensities of diagnostic tissue spectra are divided by average peak fluorescence intensity values for normal tissue in the same patient to yield relative peak fluorescence intensity values. Normal and abnormal cervical tissues are distinguished using a predetermined empirical discriminant function of slope measurements derived from normal tissue spectra and relative peak fluorescence intensity measurements in the same patient. CIN is distinguished from tissue with human papilloma virus injection or inflammation using a predetermined empirical discriminant function of average slope measurements on spectra from known normal tissue and slope measurements on a diagnostic tissue spectrum.
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Citations
20 Claims
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1. An in vivo method of detecting tissue abnormality in a diagnostic cervical tissue sample in a patient, comprising:
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illuminating the diagnostic cervical tissue sample and a presumptively histologically normal cervical tissue sample with electromagnetic radiation; detecting a first fluorescence intensity spectrum from the diagnostic tissue sample; detecting a second fluorescence intensity spectrum from the presumptively histologically normal cervical tissue sample; calculating from a predetermined portion of said first fluorescence intensity spectrum, a first slope parameter which is indicative of tissue abnormality; calculating from a predetermined portion of said second fluorescence intensity spectrum, a second slope parameter which is indicative of presumptively histologically normal cervical tissue; and detecting tissue abnormality in the diagnostic cervical tissue sample as a function of said first and second slope parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An in vivo method of detecting tissue abnormality in a diagnostic cervical tissue sample in a patient, comprising:
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identifying a presumptively histologically normal cervical tissue sample from the patient; illuminating the diagnostic tissue sample and said presumptively histologically normal tissue sample with electromagnetic radiation; detecting a first fluorescence intensity spectrum from the diagnostic tissue sample; detecting a second fluorescence intensity spectrum from said presumptively histologically normal tissue sample; calculating a slope parameter indicative of tissue abnormality from said first fluorescence intensity spectrum; calculating an intensity parameter characteristic of normal tissue from said second fluorescence intensity spectrum; calculating a discriminant parameter as a function of said slope and intensity parameters; detecting tissue abnormality in the diagnostic cervical tissue sample by substituting said discriminant parameter in a predetermined discriminant function.
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12. An in vivo method of detecting CIN in a diagnostic cervical tissue sample in a patient having presumptively known normal cervical tissue, comprising:
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illuminating the diagnostic tissue sample and presumptively known normal cervical tissue with electromagnetic radiation; detecting a first fluorescence intensity spectrum from the diagnostic tissue sample; detecting a second fluorescence intensity spectrum from the presumptively known normal cervical tissue; calculating from a predetermined portion of said first fluorescence intensity spectrum a first slope parameter which is indicative of CIN in the diagnostic cervical tissue sample; calculating from a predetermined portion of said second fluorescence intensity spectrum a second slope parameter which characterizes presumptively normal cervical tissue in the patient; and detecting CIN in the diagnostic cervical tissue sample as a function of said first and second slope parameters. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. An apparatus for in vivo detection of tissue abnormality in a diagnostic cervical tissue sample in a patient having presumptively known normal cervical tissue, comprising:
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means for applying electromagnetic radiation to a diagnostic cervical tissue sample and to presumptively known normal cervical tissue; radiation detection means for detecting a fluorescence intensity spectrum induced in the diagnostic cervical tissue sample, and for detecting a plurality of normal fluorescence intensity spectra induced in the presumptively known normal cervical tissue by said means for applying; a computer, connected to said means for applying and to said means for detecting, including, means for measuring a peak normal fluorescence intensity value in each normal fluorescence intensity spectrum, means for calculating an average peak normal fluorescence intensity from said peak normal fluorescence intensity values, means for measuring a peak fluorescence intensity value from said fluorescence intensity spectrum induced in the diagnostic cervical tissue sample, means for calculating from a predetermined portion of said fluorescence intensity spectrum a slope parameter, which is indicative of tissue abnormality, means for calculating relative peak fluorescence intensity as a function of said peak fluorescence intensity value and said average peak normal fluorescence intensity, and means for detecting tissue abnormality as a function of said slope parameter and said relative peak fluorescence intensity.
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Specification