Doppler flow velocity detection method for optical coherence tomography system

Abstract

The invention discloses a Doppler flow velocity detection method for an optical coherence tomography system, which includes the following steps: A scan mechanism performs transverse two-dimensional scanning on a steady-state calibration sample, the acquisition of three-dimensional interference signal data, Fourier transform is performed on each column of that sample three-dimensional interferencesignal data to obtain an OCT three-dimensional data map, the phase information in the OCT three-dimensional data is calculated, the phase information introduced by the scanning mechanism is extracted,according to the phase information introduced by the scanning mechanism, the rotational error parameters of the scanning mechanism are calculated, The phase information introduced by the OCT three-dimensional scanning is calculated, and the phase information is extracted to obtain the phase data map of the sample OCT scanning. The accurate phase map of the sample is obtained by subtracting the phase information introduced by the three-dimensional scanning from the phase data map, and the velocity distribution map of the sample is obtained by calculating the velocity of the sample according tothe accurate phase map of the sample. The invention can obtain the actual error of the scanning mechanism, and further obtain the accurate value of the phase error introduced by the scanning mechanism to the OCT imaging.

Description

technical field [0001] The invention belongs to the field of optical coherence tomography (OCT for short), and specifically relates to a Doppler flow velocity detection method of an optical coherence tomography system. Background technique [0002] Optical coherence tomography (OCT) is an emerging technology that has emerged in the past decade. It is based on the principle of light interference and uses a broadband light source to achieve high-resolution depth tomography with a resolution of several microns. Due to its high-resolution and non-destructive tomographic imaging capabilities, OCT has become an important imaging technology in the fields of medicine, industry, and hygiene. , Lossless, fast, three-dimensional imaging. Doppler OCT technology uses the Doppler principle to extract the flow velocity information in the OCT image to obtain the flow velocity value. [0003] At present, the commonly used Doppler technology is the phase demodulation technology, and the sca...

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Problems solved by technology

[0003] At present, the commonly used Doppler technology is phase demodulation technology, and the scanning mechanism used in the OCT system will inevitably introduce additional phase information into the phase of the final OCT image due to assembly errors. If it is not processed and suppressed, the final extracted flow velocity The value is not the true accurate speed of the detected object

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