Optical Coherence Tomography

This chapter is devoted to the description of the basic principles of data acquisition of the Optical Coherence Tomography imaging technique. The physical mechanisms of the tissue optics are detailed, while the architecture of the OCT system is provided, emphasizing on both the TD-OCT and FD-OCT. Then, after discussing about the OCT image resolution, a parametric comparison of OCT with regard to IVUS imaging technique is attempted. Finally, the limitations of the technique are described, along with the safety of its application to the clinical practice.

Download Full-text

Spectral-Domain Optical Coherence Tomography for Macular Edema

The Scientific World JOURNAL ◽

10.1155/2014/191847 ◽

2014 ◽

Vol 2014 ◽

pp. 1-6 ◽

Cited By ~ 4

Author(s):

Emmerson Badaró ◽

Eduardo Novais ◽

Larissa Maria Prodocimo ◽

Juliana M. Ferraz Sallum

Keyword(s):

Optical Coherence Tomography ◽

Clinical Practice ◽

Image Resolution ◽

Spectral Domain ◽

Retinal Diseases ◽

Optical Coherence ◽

Cross Sectional ◽

Spectral Domain Oct ◽

Acquisition Speed

Optical coherence tomography (OCT) is a rapid noncontact method that allows in vivo imaging of the retina and it has become an important component in clinical practice. OCT is a useful ancillary tool for assessing retinal diseases because of its ability to provide cross-sectional retinal images and quantitatively analyze retinal morphology. The introduction of spectral-domain OCT provided major improvements in image acquisition speed and image resolution. Future studies will address how these major technologic advances will impact the use of OCT in research and clinical practice.

Download Full-text

Recognition of Weave Patterns of Striped Fabrics Using Optical Coherence Tomography

Fibres and Textiles in Eastern Europe ◽

10.5604/01.3001.0011.7311 ◽

2018 ◽

Vol 26 (3(129)) ◽

pp. 98-103 ◽

Cited By ~ 2

Author(s):

Metin Sabuncu ◽

Hakan Özdemir

Keyword(s):

Optical Coherence Tomography ◽

Imaging Technique ◽

Woven Fabric ◽

Automatic Identification ◽

Optical Coherence ◽

High Complexity ◽

Tomography Imaging ◽

High Resolution Images ◽

Optical Coherence Tomography Imaging ◽

Contactless Measurements

The recognition of woven fabric repeat by conventional techniques is labour intensive. In general, woven fabric repeat identification is accomplished automatically by employing complex algorithms and techniques. These algorithms may, however, occasionally fail, especially when dealing with high complexity texture patterns, structures, figures and colours. Optical coherence tomography (OCT) has the capability of taking high resolution images via contactless measurements. In this paper we apply the spectral domain optical coherence tomography imaging technique for identifying striped woven fabric repeat automatically. OCT scans corresponding to four different fabrics, from which the weave matrixes were recognised, are reported in this study. Automatic identification of weave patterns of striped fabrics was accomplished non-destructively by employing optical coherence tomography.

Download Full-text

In vivo cellular optical coherence tomography imaging

Nature Medicine ◽

10.1038/nm0798-861 ◽

1998 ◽

Vol 4 (7) ◽

pp. 861-865 ◽

Cited By ~ 194

Author(s):

Stephan A. Boppart ◽

Brett E. Bouma ◽

Costas Pitris ◽

James F. Southern ◽

Mark E. Brezinski ◽

...

Keyword(s):

Optical Coherence Tomography ◽

Optical Coherence ◽

Tomography Imaging ◽

Optical Coherence Tomography Imaging

Download Full-text

Optimization of X-ray Investigations in Dentistry Using Optical Coherence Tomography

Sensors ◽

10.3390/s21134554 ◽

2021 ◽

Vol 21 (13) ◽

pp. 4554

Author(s):

Ralph-Alexandru Erdelyi ◽

Virgil-Florin Duma ◽

Cosmin Sinescu ◽

George Mihai Dobre ◽

Adrian Bradu ◽

...

Keyword(s):

Optical Coherence Tomography ◽

Radiation Dose ◽

Imaging Techniques ◽

Image Resolution ◽

Optical Coherence ◽

X Rays ◽

High Quality ◽

X Ray

The most common imaging technique for dental diagnoses and treatment monitoring is X-ray imaging, which evolved from the first intraoral radiographs to high-quality three-dimensional (3D) Cone Beam Computed Tomography (CBCT). Other imaging techniques have shown potential, such as Optical Coherence Tomography (OCT). We have recently reported on the boundaries of these two types of techniques, regarding. the dental fields where each one is more appropriate or where they should be both used. The aim of the present study is to explore the unique capabilities of the OCT technique to optimize X-ray units imaging (i.e., in terms of image resolution, radiation dose, or contrast). Two types of commercially available and widely used X-ray units are considered. To adjust their parameters, a protocol is developed to employ OCT images of dental conditions that are documented on high (i.e., less than 10 μm) resolution OCT images (both B-scans/cross sections and 3D reconstructions) but are hardly identified on the 200 to 75 μm resolution panoramic or CBCT radiographs. The optimized calibration of the X-ray unit includes choosing appropriate values for the anode voltage and current intensity of the X-ray tube, as well as the patient’s positioning, in order to reach the highest possible X-rays resolution at a radiation dose that is safe for the patient. The optimization protocol is developed in vitro on OCT images of extracted teeth and is further applied in vivo for each type of dental investigation. Optimized radiographic results are compared with un-optimized previously performed radiographs. Also, we show that OCT can permit a rigorous comparison between two (types of) X-ray units. In conclusion, high-quality dental images are possible using low radiation doses if an optimized protocol, developed using OCT, is applied for each type of dental investigation. Also, there are situations when the X-ray technology has drawbacks for dental diagnosis or treatment assessment. In such situations, OCT proves capable to provide qualitative images.

Download Full-text

Utilization potential of intraluminal optical coherence tomography for the Eustachian tube

Scientific Reports ◽

10.1038/s41598-021-85634-3 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Hayoung Byun ◽

Yeon Hoon Kim ◽

Jingchao Xing ◽

Su-Jin Shin ◽

Seung Hwan Lee ◽

...

Keyword(s):

Optical Coherence Tomography ◽

Eustachian Tube ◽

Balloon Dilatation ◽

Optical Coherence ◽

Cross Sectional ◽

Anatomical Structures ◽

Complex Anatomy ◽

Before And After ◽

Tubal Lumen ◽

Oct Image

AbstractImaging the Eustachian tube is challenging because of its complex anatomy and limited accessibility. This study fabricated a fiber-based optical coherence tomography (OCT) catheter and investigated its potential for assessing the Eustachian tube anatomy. A customized OCT system and an imaging catheter, termed the Eustachian OCT, were developed for visualizing the Eustachian tube. Three male swine cadaver heads were used to study OCT image acquisition and for subsequent histologic correlation. The imaging catheter was introduced through the nasopharyngeal opening and reached toward the middle ear. The OCT images were acquired from the superior to the nasopharyngeal opening before and after Eustachian tube balloon dilatation. The histological anatomy of the Eustachian tube was compared with corresponding OCT images, The new, Eustachian OCT catheter was successfully inserted in the tubal lumen without damage. Cross-sectional images of the tube were successfully obtained, and the margins of the anatomical structures including cartilage, mucosa lining, and fat could be successfully delineated. After balloon dilatation, the expansion of the cross-sectional area could be identified from the OCT images. Using the OCT technique to assess the Eustachian tube anatomy was shown to be feasible, and the fabricated OCT image catheter was determined to be suitable for Eustachian tube assessment.

Download Full-text