Effective duty cycle of galvanometer-based scanners: Impact on OCT imaging

Virgil Florin Duma; Patrice Tankam; Jinxin Huang; Jungeun Won; Jannick P. Rolland

doi:10.1117/12.2079776

Effective duty cycle of galvanometer-based scanners: Impact on OCT imaging

Virgil Florin Duma
, Patrice Tankam
, Jinxin Huang
, Jungeun Won
, Jannick P. Rolland

Department of Biomedical Engineering

Aurel Vlaicu University of Arad
West University of Timisoara
University of Rochester

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

2 Scopus citations

Abstract

We study experimentally the scanning functions of galvanometer-based scanners (GSs) in order to optimize them for biomedical imaging in general, and for Optical Coherence Tomography (OCT) in particular. The main scanning parameters of the scanning process are taken into account: theoretical duty cycle (of the input signal of the GS), scan frequency (fs), and scan amplitude (θm). Triangular to sawtooth scanning regimes are thus considered. We demonstrate that when increasing the scan frequency and amplitude, the scanning function (i.e., the angular position of the galvomirror) is not able to follow anymore the input signal. Furthermore, as the theoretical duty cycle is increased, the result is unexpected: the effective duty cycle actually decreases - for high fs and θm. A saturation of the device therefore occurs. The practical limits of this phenomenon are discussed. GS users are thus provided with a multi-parameter analysis that allows them for optimizing their scanning regimes and to avoid pushing the devices to their limit - when that actually results in decreasing the quality of the images obtained, by example in OCT. Gabor Domain Optical Coherence Microscopy (GD-OCM) images are made to show effects of this phenomenon.

Original language	English
Title of host publication	Design and Quality for Biomedical Technologies VIII
Editors	Rongguang Liang, Ramesh Raghavachari
Publisher	SPIE
ISBN (Electronic)	9781628414059
DOIs	https://doi.org/10.1117/12.2079776
State	Published - 2015
Event	Design and Quality for Biomedical Technologies VIII - San Francisco, United States Duration: Feb 7 2015 → Feb 8 2015

Publication series

Name	Progress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume	9315
ISSN (Print)	1605-7422

Conference

Conference	Design and Quality for Biomedical Technologies VIII
Country/Territory	United States
City	San Francisco
Period	02/7/15 → 02/8/15

Keywords

Biomedical imaging
Duty cycle
Galvanometer scanners
GD-OCM
Modeling
Optical Coherence Tomography
Sawtooth signals
Scanning functions
Triangular signals

Access to Document

10.1117/12.2079776

Cite this

Duma, V. F., Tankam, P., Huang, J., Won, J., & Rolland, J. P. (2015). Effective duty cycle of galvanometer-based scanners: Impact on OCT imaging. In R. Liang, & R. Raghavachari (Eds.), Design and Quality for Biomedical Technologies VIII Article 93150J (Progress in Biomedical Optics and Imaging - Proceedings of SPIE; Vol. 9315). SPIE. https://doi.org/10.1117/12.2079776

@inproceedings{6c6dae18a6314db99048d0b1f60d2da8,

title = "Effective duty cycle of galvanometer-based scanners: Impact on OCT imaging",

abstract = "We study experimentally the scanning functions of galvanometer-based scanners (GSs) in order to optimize them for biomedical imaging in general, and for Optical Coherence Tomography (OCT) in particular. The main scanning parameters of the scanning process are taken into account: theoretical duty cycle (of the input signal of the GS), scan frequency (fs), and scan amplitude (θm). Triangular to sawtooth scanning regimes are thus considered. We demonstrate that when increasing the scan frequency and amplitude, the scanning function (i.e., the angular position of the galvomirror) is not able to follow anymore the input signal. Furthermore, as the theoretical duty cycle is increased, the result is unexpected: the effective duty cycle actually decreases - for high fs and θm. A saturation of the device therefore occurs. The practical limits of this phenomenon are discussed. GS users are thus provided with a multi-parameter analysis that allows them for optimizing their scanning regimes and to avoid pushing the devices to their limit - when that actually results in decreasing the quality of the images obtained, by example in OCT. Gabor Domain Optical Coherence Microscopy (GD-OCM) images are made to show effects of this phenomenon.",

keywords = "Biomedical imaging, Duty cycle, Galvanometer scanners, GD-OCM, Modeling, Optical Coherence Tomography, Sawtooth signals, Scanning functions, Triangular signals",

author = "Duma, \{Virgil Florin\} and Patrice Tankam and Jinxin Huang and Jungeun Won and Rolland, \{Jannick P.\}",

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year = "2015",

doi = "10.1117/12.2079776",

language = "English",

series = "Progress in Biomedical Optics and Imaging - Proceedings of SPIE",

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Duma, VF, Tankam, P, Huang, J, Won, J & Rolland, JP 2015, Effective duty cycle of galvanometer-based scanners: Impact on OCT imaging. in R Liang & R Raghavachari (eds), Design and Quality for Biomedical Technologies VIII., 93150J, Progress in Biomedical Optics and Imaging - Proceedings of SPIE, vol. 9315, SPIE, Design and Quality for Biomedical Technologies VIII, San Francisco, United States, 02/7/15. https://doi.org/10.1117/12.2079776

Effective duty cycle of galvanometer-based scanners: Impact on OCT imaging. / Duma, Virgil Florin; Tankam, Patrice; Huang, Jinxin et al.
Design and Quality for Biomedical Technologies VIII. ed. / Rongguang Liang; Ramesh Raghavachari. SPIE, 2015. 93150J (Progress in Biomedical Optics and Imaging - Proceedings of SPIE; Vol. 9315).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Effective duty cycle of galvanometer-based scanners

T2 - Design and Quality for Biomedical Technologies VIII

AU - Duma, Virgil Florin

AU - Tankam, Patrice

AU - Huang, Jinxin

AU - Won, Jungeun

AU - Rolland, Jannick P.

PY - 2015

Y1 - 2015

N2 - We study experimentally the scanning functions of galvanometer-based scanners (GSs) in order to optimize them for biomedical imaging in general, and for Optical Coherence Tomography (OCT) in particular. The main scanning parameters of the scanning process are taken into account: theoretical duty cycle (of the input signal of the GS), scan frequency (fs), and scan amplitude (θm). Triangular to sawtooth scanning regimes are thus considered. We demonstrate that when increasing the scan frequency and amplitude, the scanning function (i.e., the angular position of the galvomirror) is not able to follow anymore the input signal. Furthermore, as the theoretical duty cycle is increased, the result is unexpected: the effective duty cycle actually decreases - for high fs and θm. A saturation of the device therefore occurs. The practical limits of this phenomenon are discussed. GS users are thus provided with a multi-parameter analysis that allows them for optimizing their scanning regimes and to avoid pushing the devices to their limit - when that actually results in decreasing the quality of the images obtained, by example in OCT. Gabor Domain Optical Coherence Microscopy (GD-OCM) images are made to show effects of this phenomenon.

AB - We study experimentally the scanning functions of galvanometer-based scanners (GSs) in order to optimize them for biomedical imaging in general, and for Optical Coherence Tomography (OCT) in particular. The main scanning parameters of the scanning process are taken into account: theoretical duty cycle (of the input signal of the GS), scan frequency (fs), and scan amplitude (θm). Triangular to sawtooth scanning regimes are thus considered. We demonstrate that when increasing the scan frequency and amplitude, the scanning function (i.e., the angular position of the galvomirror) is not able to follow anymore the input signal. Furthermore, as the theoretical duty cycle is increased, the result is unexpected: the effective duty cycle actually decreases - for high fs and θm. A saturation of the device therefore occurs. The practical limits of this phenomenon are discussed. GS users are thus provided with a multi-parameter analysis that allows them for optimizing their scanning regimes and to avoid pushing the devices to their limit - when that actually results in decreasing the quality of the images obtained, by example in OCT. Gabor Domain Optical Coherence Microscopy (GD-OCM) images are made to show effects of this phenomenon.

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KW - Galvanometer scanners

KW - GD-OCM

KW - Modeling

KW - Optical Coherence Tomography

KW - Sawtooth signals

KW - Scanning functions

KW - Triangular signals

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DO - 10.1117/12.2079776

M3 - Conference contribution

AN - SCOPUS:84928522441

T3 - Progress in Biomedical Optics and Imaging - Proceedings of SPIE

BT - Design and Quality for Biomedical Technologies VIII

A2 - Liang, Rongguang

A2 - Raghavachari, Ramesh

PB - SPIE

Y2 - 7 February 2015 through 8 February 2015

ER -

Effective duty cycle of galvanometer-based scanners: Impact on OCT imaging

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Keywords

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