Quantitative comparison of the OCT imaging depth at 1300 nm and 1600 nm

Kodach, Vitali M.; Kalkman, Jeroen; Faber, Dirk J.; Leeuwen, van

doi:10.1364/boe.1.000176

Cited by 83 publications

(65 citation statements)

References 24 publications

(21 reference statements)

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“…Some authors suggested that an imaging window at 1700 nm offers an advantage over shorter wavelengths by increasing penetration depth as well as enhancing the image contrast at deeper penetration depths by reducing multiple scattering [37]. For biological tissues, it is expected an increase in OCT imaging depth at 1600 nm compared to 1300 nm on samples with high scattering power and low water content (enamel) [38]. Otherwise at longer wavelengths, absorption increases with greater water content, which has a counterbalancing effect [37].…”

Section: Optical Coherence Tomography-the Methodsmentioning

confidence: 99%

Dental Applications of Optical Coherence Tomography (OCT) in Cariology

et al. 2017

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Across all medical disciplines, therapeutic interventions are based on previously acquired diagnostic information. In cariology, which includes the detection and assessment of the disease "caries" and its lesions, as well as non-invasive to invasive treatment and caries prevention, visual inspection and radiology are routinely used as diagnostic tools. However, the specificity and sensitivity of these standard methods are still unsatisfactory and the detection of defects is often afflicted with a time delay. Numerous novel methods have been developed to improve the unsatisfactory diagnostic possibilities in this specialized medical field. These newer techniques have not yet found widespread acceptance in clinical practice, which might be explained by the generated numerical or color-coded output data that are not self-explanatory. With optical coherence tomography (OCT), an innovative image-based technique has become available that has considerable potential in supporting the routine assessment of teeth in the future. The received cross-sectional images are easy to interpret and can be processed. In recent years, numerous applications of OCT have been evaluated in cariology beginning with the diagnosis of different defects up to restoration assessment and their monitoring, or the visualization of individual treatment steps. Based on selected examples, this overview outlines the possibilities and limitations of this technique in cariology and restorative dentistry, which pertain to the most clinical relevant fields of dentistry.

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Section: Optical Coherence Tomography-the Methodsmentioning

confidence: 99%

Dental Applications of Optical Coherence Tomography (OCT) in Cariology

et al. 2017

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“…The constant Q describes the heterodyne intensity back-coupling efficiency from a scattering medium compared to that of a mirror and ranges from 0 to 1 (see section 4.3). From this analysis it can be observed that µ b can be determined by dividing (2) by (4). The backscattering coefficient is…”

Section: Single Scattering Model Of the Oct Signalmentioning

confidence: 99%

“…For our study we utilize a home-built time-domain OCT system, which is described in detail in Ref [4]. In summary, light from a Fianium light source is filtered to obtain a spectrum centered at 1300 nm, which is coupled into a fixed focus OCT setup.…”

Section: Oct Measurementsmentioning

confidence: 99%

“…An important application of OCT is to quantitatively determine the optical properties of tissue. The attenuation coefficient of the OCT signal can be used to characterize tissue [1][2][3] and to determine the OCT imaging depth [4]. In contrast to frequently reported measurements of the OCT attenuation coefficient, quantitative measurements of the OCT backscattering are reported less often.…”

Section: Introductionmentioning

confidence: 99%

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Determination of the scattering anisotropy with optical coherence tomography

Kodach¹,

Faber²,

Marle³

et al. 2011

Opt. Express

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Abstract:In this work we demonstrate measurements with optical coherence tomography (OCT) of the scattering phase function in the backward direction and the scattering anisotropy parameter g. Measurements of the OCT attenuation coefficient and the backscattering amplitude are performed on calibrated polystyrene microspheres with a time-domain OCT system. From these measurements the phase function in the backward direction is determined. The measurements are described by the single scattering model and match Mie calculations very well. Measurements on Intralipid demonstrate the ability to determine the g of polydisperse samples and, for Intralipid, g = 0.35 ± 0.03 is measured, which is well in agreement with g from literature. These measurements are validated using the Intralipid particle size distribution determined from TEM measurements. Measurements of g and the scattering phase function in the backward direction can be used to monitor changes in backscattering, which can indicate morphological changes of the sample or act as contrast enhancement mechanism.

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“…Two main approaches have generally been taken in determining the optimum spectral window for OCT imaging of biological tissues: quantitative spectroscopic measurements of tissue optical properties to determine the optimum spectral window [12] [13], and direct comparison using OCT at a number of common spectral windows defined by the availability of sources [19][20] [21]. The disadvantage of the latter approach is that the comparisons tend to be qualitative as different OCT instruments have different inherent sensitivities and resolutions [22] [23].…”

Section: Introductionmentioning

confidence: 99%

Optimum spectral window for imaging of art with optical coherence tomography

et al. 2013

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Optical Coherence Tomography (OCT) has been shown to have potential for important applications in the field of art conservation and archaeology due to its ability to image subsurface microstructures noninvasively. However, its depth of penetration in painted objects is limited due to the strong scattering properties of artists' paints. VIS-NIR (400 nm -2400 nm) reflectance spectra of a wide variety of paints made with historic artists' pigments have been measured. The best spectral window with which to use optical coherence tomography (OCT) for the imaging of subsurface structure of paintings was found to be around 2.2 µm. The same spectral window would also be most suitable for direct infrared imaging of preparatory sketches under the paint layers. The reflectance spectra from a large sample of chemically verified pigments provide information on the spectral transparency of historic artists' pigments/paints as well as a reference set of spectra for pigment identification. The results of the paper suggest that broadband sources at ~2 microns are highly desirable for OCT applications in art and potentially material science in general.

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Quantitative comparison of the OCT imaging depth at 1300 nm and 1600 nm

Cited by 83 publications

References 24 publications

Dental Applications of Optical Coherence Tomography (OCT) in Cariology

Dental Applications of Optical Coherence Tomography (OCT) in Cariology

Determination of the scattering anisotropy with optical coherence tomography

Optimum spectral window for imaging of art with optical coherence tomography

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