Dr. rer. nat. Martin Ahrens

Wissenschaftler/Postdoc
Institut für BMO
Maria-Göppert-Str.1
23562 Lübeck
Gebäude MFC 1,
Raum 411-2
Email: | m.ahrens(at)uni-luebeck.de |
Phone: | +49 0451 3101 3239 |
Fax: | +49 0451 3101 3282 |
Publikationsliste
Awanish P.
Singh,
Madita
Göb,
Martin
Ahrens,
Tim
Eixmann,
Hinnerk
Schulz-Hildebrandt,
Gereon
Hüttmann,
Robert
Huber, and
Maik
Rahlves,
Synchronous high-speed OCT imaging with sensor less brushless DC motor and FDML laser in a phase-locked loop, in Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XXVII , Joseph A. Izatt and James G. Fujimoto, Eds. SPIE, 032023. pp. 1236703.
Synchronous high-speed OCT imaging with sensor less brushless DC motor and FDML laser in a phase-locked loop, in Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XXVII , Joseph A. Izatt and James G. Fujimoto, Eds. SPIE, 032023. pp. 1236703.
DOI: | 10.1117/12.2652955 |
Bibtex: | ![]() @inproceedings{10.1117/12.2652955, author = {Awanish Pratap Singh and Madita G{\"o}b and Martin Ahrens and Tim Eixmann and Hinnerk Schulz-Hildebrandt and Gereon H{\"u}ttmann and Robert Huber and Maik Rahlves}, title = {{Synchronous high-speed OCT imaging with sensor less brushless DC motor and FDML laser in a phase-locked loop}}, volume = {12367}, booktitle = {Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XXVII}, editor = {Joseph A. Izatt and James G. Fujimoto}, organization = {International Society for Optics and Photonics}, publisher = {SPIE}, pages = {1236703}, abstract = {High-speed endoscopic optical coherence tomography (OCT) imaging in the MHz range has shown great potential in various medical applications ranging from cancer screening to vascular disease monitoring. High-speed imaging always suffers from non-uniform rotational distortion (NURD) due to asynchronous motor rotation with the OCT system. Several research groups have previously attempted to solve this problem, using either an expensive motor with a sensor or numerical correction after data acquisition. However, both techniques pose challenges for practical use. Therefore, in this study, we use an inexpensive sensorless brushless DC motor with a Fourier domain mode-locked (FDML) laser-based MHz OCT system and try to resolve the problem of synchronization using three different modalities, (i) Slave-mode: The FDML frequency serves as a master frequency for the motor, which is phase-locked to the FDML frequency, (ii) Master-mode: The revolution trigger obtained from the motor’s back electromotive force (BEMF) signal serves as a trigger signal for the OCT imaging system, (iii) Both: Fully synchronized setup, where the motor rotation is synchronized with the laser and the imaging system is synchronized with the motor to achieve phase-stable OCT imaging. The first case slightly fluctuates in live preview and imaging due to the absence of a revolution trigger, while the second has varying motor speeds. Therefore, we use the third case to phase-lock the motor with FDML and get a distortion-free live preview and image acquisition. Finally, we demonstrate high-speed SS-OCT structural imaging (at 3.3 MHz A-scan rates) of a finger with a 16 mm diameter probe (at 40,000 rpm).}, keywords = {Optical Coherence Tomography, Endoscopy, FDML , Closed Loop Motor Control, NURD compensation, Brushless DC Motor, Back Electromotive Force}, year = {2023}, doi = {10.1117/12.2652955}, URL = {https://doi.org/10.1117/12.2652955} } |
P
Musial,
Tabea
Kohlfaerber,
Martin
Ahrens,
Hinnerk
Schulz-Hildebrandt,
Philipp
Steven, and
Gereon
Hüttmann,
Dynamic Contrast Microscopic Optical Coherence Tomography As a Novel Method for Assessing Corneal Epithelium During Exposure to Benzalkonium Chloride, Translational Vision Science & Technology , vol. 11(5), pp. 28-28, 2022.
Dynamic Contrast Microscopic Optical Coherence Tomography As a Novel Method for Assessing Corneal Epithelium During Exposure to Benzalkonium Chloride, Translational Vision Science & Technology , vol. 11(5), pp. 28-28, 2022.
DOI: | 10.1167/tvst.11.5.28 |
Datei: | tvst.11.5.28 |
Bibtex: | ![]() @article{Musial-2022, author = {Musial, G;Kohlfaerber, T;Ahrens, M;Schulz-Hildebrandt, H;Steven, P and Hüttmann, G}, title = {Dynamic Contrast Microscopic Optical Coherence Tomography As a Novel Method for Assessing Corneal Epithelium During Exposure to Benzalkonium Chloride}, journal = {Translational Vision Science & Technology}, keywords = {toxicity; optical coherence tomography; benzalkonium chloride}, volume = {11(5)}, pages = {28-28}, ISSN = {2164-2591}, DOI = {10.1167/tvst.11.5.28}, url = {https://doi.org/10.1167/tvst.11.5.28}, year = {2022}, type = {Journal Article} } |
Tabea
Kohlfaerber,
Mario
Pieper,
Michael
Münter,
Cornelia
Holzhausen,
Martin
Ahrens,
Christian
Idel,
Ludwig
Bruchhage,
Anke
Leichtle,
Peter
König,
Gereon
Hüttmann, and
Hinnerk
Schulz-Hildebrandt,
Dynamic microscopic optical coherence tomography to visualize the morphological and functional micro-anatomy of the airways, Biomedical Optics Express , vol. 13 (6), pp. 3211-3223, 2022.
Dynamic microscopic optical coherence tomography to visualize the morphological and functional micro-anatomy of the airways, Biomedical Optics Express , vol. 13 (6), pp. 3211-3223, 2022.
DOI: | 10.1364/BOE.456104 |
Bibtex: | ![]() @article{Kohlfarber2022, author = {Kohlfaerber, T;Pieper, M;Münter, M;Holzhausen, C;Ahrens, M;Idel, C;Bruchhage, K-L;Leichtle, A;König, P;Hüttmann, G and Schulz-Hildebrandt, H}, title = {Dynamic microscopic optical coherence tomography to visualize the morphological and functional micro-anatomy of the airways}, journal = {Biomedical Optics Express}, volume = {13 (6)}, pages = {3211-3223}, DOI = {10.1364/BOE.456104}, year = {2022}, type = {Journal Article} } |
Michael
Münter,
Mario
Pieper,
Tabea
Kohlfaerber,
Ernst
Bodenstorfer,
Martin
Ahrens,
Christian
Winter,
Robert
Huber,
Peter
König,
Gereon
Hüttmann, and
Hinnerk
Schulz-Hildebrandt,
Microscopic optical coherence tomography (mOCT) at 600 kHz for 4D volumetric imaging and dynamic contrast, Biomed. Opt. Express , vol. 12, pp. 6024-6039, 2021.
Microscopic optical coherence tomography (mOCT) at 600 kHz for 4D volumetric imaging and dynamic contrast, Biomed. Opt. Express , vol. 12, pp. 6024-6039, 2021.
DOI: | 10.1364/BOE.425001 |
Bibtex: | ![]() @article{Münter2021, author = {M. Münter, M. Pieper, T. Kohlfaerber, E. Bodenstorfer, M. Ahrens, C. Winter, R. Huber, P. König, G. Hüttmann and H. Schulz-Hildebrandt}, title = {Microscopic optical coherence tomography (mOCT) at 600 kHz for 4D volumetric imaging and dynamic contrast}, journal = {BiomedOptE}, volume = {12(10)}, Keywords = {CMOS cameras,Full field optical coherence tomography,High numerical aperture optics, Image processing,In vivo imaging,Medical imaging,Ag-Huber}, pages = {6024-6039}, DOI = {10.1364/BOE.425001}, year = {2021}, type = {Journal Article} } |
Hinnerk
Schulz-Hildebrandt,
Martin
Ahrens,
Elisa
Wilken,
Cornelia
Holzhausen,
Peter
König, and
Gereon
Hüttmann,
Endo-microscopic optical coherence tomography (emOCT) with dynamic contrast, in Endoscopic Microscopy XVI , Guillermo Tearney J M.D. and Thomas D Wang and Melissa J Suter, Eds. SPIE, 2021.
Endo-microscopic optical coherence tomography (emOCT) with dynamic contrast, in Endoscopic Microscopy XVI , Guillermo Tearney J M.D. and Thomas D Wang and Melissa J Suter, Eds. SPIE, 2021.
DOI: | 10.1117/12.2575733 |
Datei: | 12.2575733 |
Bibtex: | ![]() @inproceedings{10.1117/12.2575733, title = {Endo-microscopic optical coherence tomography (emOCT) with dynamic contrast}, author = {Hinnerk Schulz-Hildebrandt and Martin Ahrens and Michael M\"{u}nter and Elisa Wilken and Tabea Kohlf\"{a}rber and Cornelia Holzhausen and Peter K\"{o}nig and Gereon H\"{u}ttmann}, editor = {Guillermo Tearney J M.D. and Thomas D Wang and Melissa J Suter}, url = {https://doi.org/10.1117/12.2575733}, doi = {10.1117/12.2575733}, year = {2021}, date = {2021-01-01}, booktitle = {Endoscopic Microscopy XVI}, volume = {11620}, publisher = {SPIE}, organization = {International Society for Optics and Photonics}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Martin
Ahrens,
Christian
Idel,
Peter
König,
Gereon
Hüttmann, and
Hinnerk
Schulz-Hildebrandt,
Voice coil based endomicroscopic optical coherence tomography probe for in vivo mucosa examination, in Endoscopic Microscopy XVI , Guillermo Tearney J M.D. and Thomas D Wang and Melissa J Suter, Eds. SPIE, 2021.
Voice coil based endomicroscopic optical coherence tomography probe for in vivo mucosa examination, in Endoscopic Microscopy XVI , Guillermo Tearney J M.D. and Thomas D Wang and Melissa J Suter, Eds. SPIE, 2021.
DOI: | 10.1117/12.2578787 |
Datei: | 12.2578787 |
Bibtex: | ![]() @inproceedings{10.1117/12.2578787, title = {Voice coil based endomicroscopic optical coherence tomography probe for in vivo mucosa examination}, author = {Martin Ahrens and Christian Idel and Peter K\"{o}nig and Gereon H\"{u}ttmann and Hinnerk Schulz-Hildebrandt}, editor = {Guillermo Tearney J M.D. and Thomas D Wang and Melissa J Suter}, url = {https://doi.org/10.1117/12.2578787}, doi = {10.1117/12.2578787}, year = {2021}, date = {2021-01-01}, booktitle = {Endoscopic Microscopy XVI}, volume = {11620}, publisher = {SPIE}, organization = {International Society for Optics and Photonics}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Hartmut
Schneider,
Martin
Ahrens,
Michaela
Strumpski,
Claudia
Rüger,
Matthias
Häfer,
Gereon
Hüttmann,
Dirk
Theisen-Kunde,
Hinnerk
Schulz-Hildebrandt, and
Rainer
Haak,
An Intraoral OCT Probe to Enhanced Detection of Approximal Carious Lesions and Assessment of Restorations, J Clin Med , vol. 9(10), 2020.
An Intraoral OCT Probe to Enhanced Detection of Approximal Carious Lesions and Assessment of Restorations, J Clin Med , vol. 9(10), 2020.
DOI: | 10.3390/jcm9103257 |
Bibtex: | ![]() @article{schneider2020, author = {Schneider, H.;Ahrens, M.;Strumpski, M.;Ruger, C.;Hafer, M.;Huettmann, G.;Theisen-Kunde, D.;Schulz-Hildebrandt, H. and Haak, R.}, title = {An Intraoral OCT Probe to Enhanced Detection of Approximal Carious Lesions and Assessment of Restorations}, journal = {J Clin Med}, volume = {9(10)}, keywords = {OCT; intraoral probe; carious lesions; caries diagnosis; dental restorations}, ISSN = {2077-0383 (Print) 2077-0383 (Linking)}, DOI = {10.3390/jcm9103257}, year = {2020}, type = {Journal Article} } |
Michael
Münter,
Mario
Pieper,
Malte
Casper,
Martin
Ahrens,
Tabea
Kohlfaerber,
Ramtin
Rahmanzadeh,
Peter
König,
Gereon
Hüttmann, and
Hinnerk
Schulz-Hildebrandt,
Dynamic contrast in scanning microscopic OCT, Optic Letters , 2020.
Dynamic contrast in scanning microscopic OCT, Optic Letters , 2020.
Datei: | 2003.00006 |
Bibtex: | ![]() @article{Münter2020, author = {Münter, M;Endt, M v;Pieper, M;Casper, M;Ahrens, M;Kohlfaerber, T;Rahmanzadeh, R;König, P;Hüttmann, G and Schulz-Hildebrandt, H}, title = {Dynamic contrast in scanning microscopic OCT}, journal = {Optic Letters}, url = {https://arxiv.org/abs/2003.00006}, year = {2020}, type = {Journal Article} } |
Rainer
Haak,
Martin
Ahrens,
Hartmut
Schneider,
Michaela
Strumpski,
Claudia
Rueger,
Matthias
Haefer,
Dirk
Theisen-Kunde, and
Hinnerk
Schulz-Hildebrandt,
Handheld OCT probe for intraoral diagnosis on teeth, in Proc. SPIE 11073, Clinical and Preclinical Optical Diagnostics II , 2019. pp. 1--4.
Handheld OCT probe for intraoral diagnosis on teeth, in Proc. SPIE 11073, Clinical and Preclinical Optical Diagnostics II , 2019. pp. 1--4.
DOI: | 10.1117/12.2527185 |
ISBN: | 9781510628397 |
Datei: | 12.2527185.full |
Bibtex: | ![]() @inproceedings{Haak2019, author = {Haak, Rainer and Ahrens, Martin and Schneider, Hartmut and Strumpski, Michaela and Rueger, Claudia and Haefer, Matthias and H{\"{u}}ttmann, Gereon and Theisen-Kunde, Dirk and Schulz-Hildebrandt, Hinnerk}, booktitle = {Proc. SPIE 11073, Clinical and Preclinical Optical Diagnostics II}, doi = {10.1117/12.2527185}, isbn = {9781510628397}, number = {110730W}, pages = {1--4}, title = {{Handheld OCT probe for intraoral diagnosis on teeth}}, keywords = {OCT,Endoskope}, year = {2019}, } |
Hinnerk
Schulz-Hildebrandt,
Tom
Pfeiffer,
Tim
Eixmann,
Sabrina
Lohmann,
Martin
Ahrens,
Josua
Rehra,
Wolfgang
Draxinger,
Peter
König,
Robert
Huber, and
Gereon
Hüttmann,
High-speed fiber scanning endoscope for volumetric multi-megahertz optical coherence tomography, Opt. Lett. , vol. 43, no. 18, pp. 4386-4389, 09 2018. Optica Publishing Group.
High-speed fiber scanning endoscope for volumetric multi-megahertz optical coherence tomography, Opt. Lett. , vol. 43, no. 18, pp. 4386-4389, 09 2018. Optica Publishing Group.
DOI: | 10.1364/OL.43.004386 |
Bibtex: | ![]() @article{Schulz-Hildebrandt:18, author = {Hinnerk Schulz-Hildebrandt and Tom Pfeiffer and Tim Eixmann and Sabrina Lohmann and Martin Ahrens and Joshua Rehra and Wolfgang Draxinger and Peter K\"{o}nig and Robert Huber and Gereon H\"{u}ttmann}, journal = {Opt. Lett.}, keywords = {Fiber optics imaging; Endoscopic imaging; Medical and biological imaging; Optical coherence tomography; Fourier domain mode locking; Image quality; Optical coherence tomography; Single mode fibers; Step index fibers; Three dimensional imaging}, number = {18}, pages = {4386--4389}, publisher = {Optica Publishing Group}, title = {High-speed fiber scanning endoscope for volumetric multi-megahertz optical coherence tomography}, volume = {43}, month = {Sep}, year = {2018}, url = {https://opg.optica.org/ol/abstract.cfm?URI=ol-43-18-4386}, doi = {10.1364/OL.43.004386}, abstract = {We present a forward-viewing fiber scanning endoscope (FSE) for high-speed volumetric optical coherence tomography (OCT). The reduction in size of the probe was achieved by substituting the focusing optics by an all-fiber-based imaging system which consists of a combination of scanning single-mode fibers, a glass spacer, made from a step-index multi-mode fiber, and a gradient-index fiber. A lateral resolution of 11 $\mu$m was achieved at a working distance of 1.2 mm. The newly designed piezo-based FSE has an outer diameter of 1.6 mm and a rigid length of 13.5 mm. By moving the whole imaging optic in spirals for scanning the sample, the beam quality remains constant over the entire field of view with a diameter of 0.8 mm. The scanning frequency was adjusted to 1.22 kHz for use with a 3.28 MHz Fourier domain mode locked OCT system. Densely sampled volumes have been imaged at a rate of 6 volumes per second.}, } |