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Accuracy and precision of depth-resolved estimation of attenuation coefficients in optical coherence tomography
SIGNIFICANCE: Parametric imaging of the attenuation coefficient [Formula: see text] using optical coherence tomography (OCT) is a promising approach for evaluating abnormalities in tissue. To date, a standardized measure of accuracy and precision of [Formula: see text] by the depth-resolved estimati...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Society of Photo-Optical Instrumentation Engineers
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10265837/ https://www.ncbi.nlm.nih.gov/pubmed/37325192 http://dx.doi.org/10.1117/1.JBO.28.6.066001 |
Sumario: | SIGNIFICANCE: Parametric imaging of the attenuation coefficient [Formula: see text] using optical coherence tomography (OCT) is a promising approach for evaluating abnormalities in tissue. To date, a standardized measure of accuracy and precision of [Formula: see text] by the depth-resolved estimation (DRE) method, as an alternative to least squares fitting, is missing. AIM: We present a robust theoretical framework to determine accuracy and precision of the DRE of [Formula: see text]. APPROACH: We derive and validate analytical expressions for the accuracy and precision of [Formula: see text] determination by the DRE using simulated OCT signals in absence and presence of noise. We compare the theoretically achievable precisions of the DRE method and the least-squares fitting approach. RESULTS: Our analytical expressions agree with the numerical simulations for high signal-to-noise ratios and qualitatively describe the dependence on noise otherwise. A commonly used simplification of the DRE method results in a systematic overestimation of the attenuation coefficient in the order of [Formula: see text] , where [Formula: see text] is the pixel stepsize. When [Formula: see text] , [Formula: see text] is reconstructed with higher precision by the depth-resolved method compared to fitting over the length of an axial fitting range [Formula: see text]. CONCLUSIONS: We derived and validated expressions for the accuracy and precision of DRE of [Formula: see text]. A commonly used simplification of this method is not recommended as being used for OCT-attenuation reconstruction. We give a rule of thumb providing guidance in the choice of estimation method. |
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