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Assadi H, Demidov V, Karshafian R, Douplik A, Vitkin IA. Microvascular contrast enhancement in optical coherence tomography using microbubbles. JOURNAL OF BIOMEDICAL OPTICS 2016; 21:76014. [PMID: 27533242 DOI: 10.1117/1.jbo.21.7.076014] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Accepted: 07/11/2016] [Indexed: 06/06/2023]
Abstract
Gas microbubbles (MBs) are investigated as intravascular optical coherence tomography (OCT) contrast agents. Agar + intralipid scattering tissue phantoms with two embedded microtubes were fabricated to model vascular blood flow. One was filled with human blood, and the other with a mixture of human blood + MB. Swept-source structural and speckle variance (sv) OCT images, as well as speckle decorrelation times, were evaluated under both no-flow and varying flow conditions. Faster decorrelation times and higher structural and svOCT image contrasts were detected in the presence of MB in all experiments. The effects were largest in the svOCT imaging mode, and uniformly diminished with increasing flow velocity. These findings suggest the feasibility of utilizing MB for tissue hemodynamic investigations and for microvasculature contrast enhancement in OCT angiography.
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Affiliation(s)
- Homa Assadi
- Ryerson University, Department of Physics, 350 Victoria Street, Toronto, Ontario M5B 2K3, Canada
| | - Valentin Demidov
- University of Toronto, Department of Medical Biophysics, Toronto Medical Discovery Tower, MaRS Centre, 101 College Street, Room 15-701, Toronto, Ontario M5G 1L7, Canada
| | - Raffi Karshafian
- Ryerson University, Department of Physics, 350 Victoria Street, Toronto, Ontario M5B 2K3, CanadacSt. Michael Hospital, Keenan Research Centre of the LKS Knowledge Institute, 209 Victoria Street, Toronto M5B 1W8, Canada
| | - Alexandre Douplik
- Ryerson University, Department of Physics, 350 Victoria Street, Toronto, Ontario M5B 2K3, CanadacSt. Michael Hospital, Keenan Research Centre of the LKS Knowledge Institute, 209 Victoria Street, Toronto M5B 1W8, Canada
| | - I Alex Vitkin
- University of Toronto, Department of Medical Biophysics, Toronto Medical Discovery Tower, MaRS Centre, 101 College Street, Room 15-701, Toronto, Ontario M5G 1L7, CanadadUniversity Health Network, Princess Margaret Cancer Centre, 610 University Avenue, Tor
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Allen J, Howell K. Microvascular imaging: techniques and opportunities for clinical physiological measurements. Physiol Meas 2014; 35:R91-R141. [DOI: 10.1088/0967-3334/35/7/r91] [Citation(s) in RCA: 131] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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Zeng Y, Xiong K, Lu X, Feng G, Han D, Wu J. Laser Doppler projection tomography. OPTICS LETTERS 2014; 39:904-6. [PMID: 24562237 DOI: 10.1364/ol.39.000904] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
We propose a laser Doppler projection tomography (LDPT) method to obtain visualization of three-dimensional (3D) flowing structures. With LDPT, the flowing signal is extracted by a modified laser Doppler method, and the 3D flowing image is reconstructed by the filtered backprojection algorithm. Phantom experiments are performed to demonstrate that LDPT is able to obtain 3D flowing structure with higher signal-to-noise ratio and spatial resolution. Our experiment results display its potentially useful application to develop 3D label-free optical angiography for the circulation system of live small animal models or microfluidic experiments.
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