SCOPUS ID: 26638425000: http://www.scopus.com/authid/detail.uri?authorId=26638425000
RESEARCHER ID: http://www.researcherid.com/rid/F-7094-2012
RESEARCH GATE: https://www.researchgate.net/profile/Adrian_Podoleanu
- Head of Applied Optics Group
Podoleanu received the Ph.D. degree in Electronics from the Electronics and
Telecommunications Faculty, Technical University of Bucharest, Romania in 1984.
He began his career teaching at the Technical University Bucharest, Romania. As
an associate professor, he taught Physics, Optics and Optoelectronics and
developed research on Lasers and fast optoelectronics.
2004 he is a Full Professor of Biomedical Optics in the School of Physical
Sciences at the University of Kent, Canterbury, UK and heads the Applied Optics
Group. His research interests focus on optical coherence tomography
(OCT), imaging the eye, distance measurements using low coherence
interferometry, subnanosecond dwell time multichannel
digital correlation, sensing and secure optical communications. He contributed
towards development of the en-face OCT imaging as a novel technology to
complement the more conventional longitudinal OCT imaging, towards the dual
imaging instrument for the eye, OCT/SLO and towards Fourier domain OCT with no
mirror terms (using Talbot bands).
is involved in teaching of non-invasive optical imaging methods with emphasis
on OCT, Electromagnetism and Optics and Medical Physics.
- Excellence Prize for Innovation in Health in the field of optical coherence tomography, at the 2nd Edition of Innovation in Health Awards, Media Systems Communication (MSCo.), Sheraton Hotel, Bucharest, Romania, 8 April 2015;
- Royal Society Wolfson Research Merit Award, 2015;
- European Research Council, Advanced Research Fellowship, 2010-2015;(please here link:https://erc.europa.eu/projects-and-results/erc-funded-projects/cogatimabio)
- Ambassador’s Diploma, Embassy of Romania in the UK, 24 Oct. 2009;
- Leverhulme Research Fellowship, 2004 - 2006;
- The Romanian Academy “Constantin Miculescu” prize for research in Lasers and Nonlinear Optics in 1984.
Fellowships And Honours
- Visiting professor: New York Eye and Ear Infirmary, USA, 2008-2015;
- Visiting professor: Victor Babes University of Pharmacy and Medicine Timisoara, Romania, since
- Distinguished visitor University of Auckland, New Zealand, April 2013.
Convenor PH504, Electromagnetism and Optics Convenor PH513, Medical Physics Convenor PH800, Biomedical Optics (.doc)
in peer reviewed journals: 206
at conferences: over 670 (resulting in proceedings of or longer than 3 pages,
21 awarded, 4 patent applications.
talks and seminars: 72.
is a member in the editorial boards of 8 journals, chaired 8 international
conferences and acted as a member in the organising committees of over 40 international conferences.
is director of Optopod Ltd, a spin-out of the University of Kent involved in spectral OCT.
Top publishing author in the University for 2010 - 2015
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Room 301, Ingram Building
1st in the Top 100 authors, by number of publications at the University of Kent over the period 2012 to 2015.
For a full list of publications please click here. (pdf)
Cernat, R. et al. (2017). Gabor fusion master slave optical coherence tomography. Biomedical Optics Express [Online] 8:813-827. Available at: http://dx.doi.org/10.1364/BOE.8.000813.
Abstract | View in KAR
This paper describes the application of the Gabor filtering protocol to a Master/Slave (MS) swept source optical coherence tomography (SS)-OCT system at 1300 nm. The MS-OCT system delivers information from selected depths, a property that allows operation similar to that of a time domain OCT system, where dynamic focusing is possible. The Gabor filtering processing following collection of multiple data from different focus positions is different from that utilized by a conventional swept source OCT system using a Fast Fourier transform (FFT) to produce an A-scan. Instead of selecting the bright parts of A-scans for each focus position, to be placed in a final B-scan image (or in a final volume), and discarding the rest, the MS principle can be employed to advantageously deliver signal from the depths within each focus range only. The MS procedure is illustrated on creating volumes of data of constant transversal resolution from a cucumber and from an insect by repeating data acquisition for 4 different focus positions. In addition, advantage is taken from the tolerance to dispersion of the MS principle that allows automatic compensation for dispersion created by layers above the object of interest. By combining the two techniques, Gabor filtering and Master/Slave, a powerful imaging instrument is demonstrated. The master/slave technique allows simultaneous display of three categories of images in one frame: multiple depth en-face OCT images, two cross-sectional OCT images and a confocal like image obtained by averaging the en-face ones. We also demonstrate the superiority of MS-OCT over its FFT based counterpart when used with a Gabor filtering OCT instrument in terms of the speed of assembling the fused volume. For our case, we show that when more than 4 focus positions are required to produce the final volume, MS is faster than the conventional FFT based procedure.
Bradu, A., Rivet, S. and Podoleanu, A. (2016). Master/slave interferometry ideal tool for coherence revival swept source optical coherence tomography. Biomedical Optics Express [Online] 7:2453-2468. Available at: http://doi.org/10.1364/BOE.7.002453.
Abstract | View in KAR | View Full Text
In this paper, we demonstrate that the master slave (MS) interferometry method can significantly simplify the practice of coherence revival swept source optical coherence tomography (OCT) technique. Previous implementations of the coherence revival technique required considerable resources on dispersion compensation and data resampling. The total tolerance of the MS method to nonlinear tuning, to dispersion in the interferometer and to dispersion due to the laser cavity, makes the MS ideally suited to the practice of coherence revival. In addition, enhanced versatility is allowed by the MS method in displaying shorter axial range images than that determined by the digital sampling of the data. This brings an immediate improvement in the speed of displaying cross-sectional images at high rates without the need of extra hardware such as graphics processing units or field programmable gate arrays. The long axial range of the coherence revival regime is proven with images of the anterior segment of healthy human volunteers.
Rivet, S. et al. (2016). Optical module to extend any Fourier-domain optical coherence tomography system into a polarisation-sensitive system. Journal of Optics [Online] 18:5607. Available at: http://dx.doi.org/10.1088/2040-8978/18/6/065607.
Abstract | View in KAR
This article presents a theoretical study on an optical module (OM) that can be inserted between an object under investigation and a Fourier-domain optical coherence tomography system, transforming the latter into a polarisation-sensitive optical coherence tomography optical coherence tomography (OCT) system. The module consists of two electro-optic modulators, a Faraday rotator, a linear polariser and a quarter-wave plate. A detailed description on how the module can be used to extract both the net retardance and the fast axis orientation of a linear birefringent sample is presented. This is achieved by taking two sequential measurements for different values of retardance produced by the electro-optic modulator. The module keeps measurements free from undesired polarimetric effects due to birefringence in the single-mode optical fibre and diattenuation in fibre-based couplers within OCT systems. Simulations have been carried out in order to evaluate the effects of chromatic behaviour of the components within the OM.
Rivet, S. et al. (2016). Complex Master Slave Interferometry. Optics Express [Online] 24:2885-2904. Available at: http://dx.doi.org/10.1364/OE.24.002885.
Abstract | View in KAR | View Full Text
A general theoretical model is developed to improve the novel Spectral Domain Interferometry method denoted as Master/Slave (MS) Interferometry. In this model, two functions, g and h are introduced to describe the modulation chirp of the channeled spectrum signal due to nonlinearities in the decoding process from wavenumber to time and due to
dispersion in the interferometer. The utilization of these two functions brings two major improvements to previous implementations of the MS method. A first improvement consists in reducing the number of channeled spectra necessary to be collected at Master stage. In previous MSI implementation, the number of channeled spectra at the Master stage
equated the number of depths where information was selected from at the Slave stage. The paper demonstrates that two experimental channeled spectra only acquired at Master stage suffice to produce A-scans from any number of resolved depths at the Slave stage. A second improvement is the utilization of complex signal processing. Previous MSI implementations discarded the phase. Complex processing of the electrical signal determined by the channeled spectrum allows phase processing that opens several novel avenues. A first consequence of such signal processing is reduction in the random component of the phase without affecting the axial resolution. In previous MSI implementations, phase instabilities were reduced by an average over the wavenumber that led to reduction in the axial resolution.
Chin, C. et al. (2016). Acousto-optic tunable filter for dispersion characterization of time-domain optical coherence tomography systems. Applied Optics [Online] 55:5707-5714. Available at: http://dx.doi.org/10.1364/AO.55.005707.
Abstract | View in KAR
A broadband supercontinuum light source with an acousto-optic tunable filter (AOTF) are used to characterize dispersion in two time-domain OCT systems, at 850 and 1300 nm. The filter is designed to sweep across two spectral ranges, which are restricted here from 800 to 900 nm and from 1200 to 1500 nm, respectively. Dispersion compensation for 850 nm was achieved with a spectral delay line. Dispersion compensation for 1300 nm was achieved using BK 7 rod glasses in the reference arm. The AOTF allows evaluation of dispersion in under as well as overcompensated systems. The AOTF method is based on wavelength dependence of the optical path difference corresponding to the maximum strength of the interference signal recorded using a mirror as object. Comparison is made between the AOTF method and the more usual method based on measurement of the full width at half-maximum of the autocorrelation peak. This comparison shows that the AOTF method is more accurate in terms of evaluation of the dispersion left uncompensated after each adjustment. The AOTF method additionally provides information on the direction of dispersion compensation.
Publications in the last 12 Months
A list of all publications in the last 12 months can be found here. (.pdf)
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- PG: PH800, Biomedical Optics;
- 2nd year: Electromagnetism and Optics II (PH504);
- 3rd year: Relativity, Optics and Maxwell's equations (PH604);
- Biomedical Optics (within the unit Medical Physics, PH513);
LECTURES AT SUMMER SCHOOLS
Lasers in Medicine and Life Sciences, Szeged, Hungary, 13-18 July 2015
Optical Coherence Tomography Part A, 16th July 2015, on youtube back to top
Optical Coherence Tomography Part B, 16th July 2015, on youtube
Professor Adrian Podoleanu is head of the Applied Optics Group.
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