Phase-resolved Doppler imaging with dual-detection full-range frequency domain optical coherence tomography

Meemon, Panomsak; Lee, K. S.; Rolland, Jannick P.

doi:10.1117/12.878647

Cited by 2 publications

(1 citation statement)

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“…Alternatively, diffraction grating-based frequency-domain optical delay lines (FD-ODL), also known as rapid scanning optical delay (RSOD) lines [41][42][43] have been used in TD-OCT mainly for rapid axial scanning up to a few kHz, as, to generate an axial scan, they only involve a tilt of a small mirror back and forth over a short angular range. Other uses include hardwarebased dispersion imbalance compensation in OCT [44][45][46], fast depth tracking and adaptive ranging [47][48][49][50], and complex conjugate artifact removal in FD-OCT [51][52][53][54][55]. In FD-ODL the mirror counter-rotation is typically actuated by a galvanometric scanner, for which a PID servo controller and the associated electronics including a power supply capable of supplying high currents are needed.…”

Section: Introductionmentioning

confidence: 99%

Long-range frequency-domain optical delay line based on a spinning tilted mirror for low-cost ocular biometry

Urizar

Castro

Gambra³

et al. 2023

Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XXVII

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Optical biometers are routinely used to measure intraocular distances in ophthalmic applications such as cataract surgery planning or myopia monitoring. However, due to their high cost and reduced transportability, access to them for screening and surgical planning is still limited in low-resource and remote settings. To increase patients' access to optical biometry we propose a novel low-cost frequency-domain optical delay line (FD-ODL) based on an inexpensive stepper motor spinning a tilted mirror, for integration into a time-domain (TD)-biometer, amenable to a compact footprint. In the proposed FD-ODL, the axial scan range and the A-scan rate are decoupled from one another, as the former only depends on the spinning mirror tilt angle, while the A-scan rate only depends on the motor shaft rotational speed. We characterized the scanning performance and specifications for two spinning mirror tilt angles, and compared them to those of the standard, more expensive FD-ODL implementation, employing a galvanometric scanner for group delay generation. A prototype of the low-cost FD-ODL with a 1.5 deg tilt angle, resulting in an axial scan range of 6.61 mm and an A-scan rate of 10 Hz was experimentally implemented and integrated in a dual sample beam optical low-coherence reflectometry (OLCR) setup with a detour unit to replicate the measurement window around the anterior segment and the retina. The intraocular distances of a model eye were measured with the proposed low-cost biometer and found in good agreement with those acquired by a custom swept-source optical coherence tomography (SS-OCT) system, and two commercial biometers, validating our novel design.

show abstract

Section: Introductionmentioning

confidence: 99%

Long-range frequency-domain optical delay line based on a spinning tilted mirror for low-cost ocular biometry

Urizar

Castro

Gambra³

et al. 2023

Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XXVII

View full text Add to dashboard Cite

show abstract

Long-range frequency-domain optical delay line based on a spinning tilted mirror for low-cost ocular biometry

Urizar,

de Castro,

Gambra

et al. 2023

Preprint

View full text Add to dashboard Cite

Optical biometers are routinely used to measure intraocular distances in ophthalmic applications such as cataract surgery planning or myopia monitoring. However, due to their high cost and reduced transportability, access to them for screening and surgical planning is still limited in low-resource and remote settings. To increase patients’ access to optical biometry we propose a novel low-cost frequency-domain optical delay line (FD-ODL) based on an inexpensive stepper motor spinning a tilted mirror, for integration into a time-domain (TD) biometer, amenable to a compact footprint. In the proposed FD-ODL, the axial scan range and the A-scan rate are decoupled from one another, as the former only depends on the spinning mirror tilt angle, while the A-scan rate only depends on the motor shaft rotational speed. We characterized the scanning performance and specifications for two spinning mirror tilt angles, and compared them to those of the standard, more expensive FD ODL implementation, employing a galvanometric scanner for group delay generation. A prototype of the low-cost FD-ODL with a 1.5 deg tilt angle, resulting in an axial scan range of 6.61 mm and an A-scan rate of 10 Hz was experimentally implemented and integrated in a dual sample beam optical low-coherence reflectometry (OLCR) setup with a detour unit to replicate the measurement window around the anterior segment and the retina. The intraocular distances of a model eye were measured with the proposed low-cost biometer and found in good agreement with those acquired by a custom swept-source optical coherence tomography (SS-OCT) system, and two commercial biometers, validating our novel design.

show abstract

Phase-resolved Doppler imaging with dual-detection full-range frequency domain optical coherence tomography

Cited by 2 publications

References 0 publications

Long-range frequency-domain optical delay line based on a spinning tilted mirror for low-cost ocular biometry

Long-range frequency-domain optical delay line based on a spinning tilted mirror for low-cost ocular biometry

Long-range frequency-domain optical delay line based on a spinning tilted mirror for low-cost ocular biometry

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