Digitizer for an optical coherence tomography imager
AssigneeAcqiris
InventorsDaniel AEBISCHER, Pierre-François MAISTRE, Toblas BLASER
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Abstract
A digitizer and processor device for a swept-source optical coherence tomography (SS-OCT) imaging system, comprising: an input configured to receive an OCT signal; a control input configured to receive a k-clock signal; a combiner unit (130) receiving the OCT signal and the k-clock signal configured to output a composite signal; a digitizing unit (60) arranged to convert the composite signal into a digital composite signal (69); a data processing unit (70) arranged to determine a profile of optical density in a sample that generated the OCT signal based on the digital composite signal (69).
Claims10
A digitizer and processor device for a swept-source optical coherence tomography imaging system, comprising:
- an input configured to receive an OCT analogue signal;
- a control input configured to receive a k-clock analogue signal;
- a combiner unit receiving the OCT analogue signal and the k-clock analogue signal, configured to output a composite analogue signal;
- a digitizing unit arranged to convert the composite analogue signal into a digital composite signal;
- a data processing unit arranged to determine a tomographic profile of the sample that generated the OCT signal based on the digital composite signal.
The digitizer and processor of claim 3, wherein the data processing unit is arranged to determine the values of the wavenumber corresponding to sample times of the digital OCT signal, based on the digital k-clock
The digitizer and processor of claim 4, including a trigger input for receiving a trigger signal marking the occurrence of a scan of a swept light source, wherein the digitizing unit generates the digital composite signal as a vector of samples synchronised with an A/D clock, the trigger falling at a predetermined position in the vector.
The digitizer and processor of claim 5, wherein the data processing unit comprises a trigger time interpolation unit, arranged to determine a temporal position of the trigger signal, relative to the A/D clock, and to apply a correction to the values of the wavenumber corresponding to sample times of the digital OCT signal, based on said position.
Dependencies are inferred from the claim text.