Topic
Optical coherence tomography
About: Optical coherence tomography is a research topic. Over the lifetime, 19051 publications have been published within this topic receiving 477433 citations. The topic is also known as: optical coherent tomography.
Papers published on a yearly basis
Papers
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TL;DR: In this article, a MEMS tunable VCSEL was demonstrated for OCT imaging with high speed and long depth range of up to 1.2MHz axial scan rate with unidirectional and bidirectional high duty cycle
Abstract: This paper demonstrates new wavelength swept light source technology, MEMS tunable VCSELs, for OCT imaging.
The VCSEL achieves a combination of ultrahigh sweep speeds, wide spectral tuning range, flexibility in sweep
trajectory, and extremely long coherence length, which cannot be simultaneously achieved with other technologies. A
second generation prototype VCSEL is optically pumped at 980nm and a low mass electrostatically tunable mirror
enables high speed wavelength tuning centered at ~1310nm with ~110nm of tunable bandwidth. Record coherence
length >100mm enables extremely long imaging range. By changing the drive waveform, a single 1310nm VCSEL was
driven to sweep at speeds from 100kHz to 1.2MHz axial scan rate with unidirectional and bidirectional high duty cycle
sweeps. We demonstrate long range and high resolution 1310nm OCT imaging of the human anterior eye at 100kHz
axial scan rate and imaging of biological samples at speeds of 60kHz - 1MHz. A first generation 1050nm device is
shown to sweep over 100nm. The results of this study suggest that MEMS based VCSEL swept light source technology
has unique performance characteristics and will be a critical technology for future ultrahigh speed and long depth range
OCT imaging.
136 citations
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TL;DR: In this article, the authors presented a benchmark pilot study in which high-resolution Full-Field Optical Coherence Tomography (FF-OCT) was used to image human breast tissue and is evaluated to assess its ability to aid the pathologist's management of intra-operative diagnoses.
Abstract: We present a benchmark pilot study in which high-resolution Full-Field Optical Coherence Tomography (FF-OCT) was used to image human breast tissue and is evaluated to assess its ability to aid the pathologist's management of intra-operative diagnoses. FF-OCT imaging safety was investigated and agreement between FF-OCT and routinely prepared histopathological images was evaluated. The compact setup used for this study provides 1 mm3 resolution and 200 mm imaging depth, and a 2.25 cm2 specimen is scanned in about 7 minutes. 75 breast specimens were imaged from 22 patients (21 women, 1 man) with a mean age of 58 (range: 25-83). Pathologists blind diagnosed normal/benign or malignant tissue based on FF-OCT images alone, diagnosis from histopathology followed for comparison. The contrast in the FF-OCT images is generated by intrinsic tissue scattering properties, meaning that no tissue staining or preparation is required. Major architectural features and tissue structures of benign breast tissue, including adipocytes, fibrous stroma, lobules and ducts were characterized. Subsequently, features resulting from pathological modification were characterized and a diagnosis decision tree was developed. Using FF-OCT images, two breast pathologists were able to distinguish normal/benign tissue from lesional with a sensitivity of 94% and 90%, and specificity of 75% and 79% respectively.
136 citations
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TL;DR: Applications of this noninvasive optical technique for monitoring changes in blood flow dynamics and vessel structure following pharmacological intervention and photodynamic therapy are demonstrated.
Abstract: A noninvasive optical technique has been developed for imaging in vivo blood flow dynamics and vessel structure with high spatial resolution. The technique is based on optical Doppler tomography, which combines Doppler velocimetry with optical coherence tomography to measure blood flow velocity at discrete spatial locations in turbid biological tissue. Applications of this technique for monitoring changes in blood flow dynamics and vessel structure following pharmacological intervention and photodynamic therapy are demonstrated.
135 citations
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TL;DR: Assessment of successfully repaired idiopathic macular holes with optical coherence tomographic images provides a useful correlation with postoperative visual recovery.
135 citations
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14 May 1997TL;DR: In optical coherence tomography, a light beam scans the object along a x-line on the surface, and the depth from which light of intensity I is reflected is measured by means of a partial-coherence interferometer as mentioned in this paper.
Abstract: In optical coherence tomography, a sectional image I(x,z) of an object is obtained in that a light beam scans the object along a x-line on the surface, and the depth z from which light of intensity I is reflected is measured by means of a partial-coherence interferometer In so doing, a strong medium intensity can cover and conceal small differences in adjacent object points The invention renders small differences in adjacent object points visible in that the object is illuminated by a dual beam which simultaneously illuminates the object at two adjacent points and whose two components are in opposite phase after traversing the arrangement, so that they cancel one another in a homogeneous object structure On the other hand, if changes are brought about in the two light bundles by means of the reflectance at the object structure, they do not cancel one another, but rather produce an image signal
135 citations