Real-time tomographic imaging without x-rays: a smart pixel array with massively parallel signal processing for real-time optical coherence tomography performing close to the physical limits

2005 ◽  
Author(s):  
S. Beer ◽  
P. Seitz
Keyword(s):  
Signal Processing ◽  
Optical Coherence Tomography ◽  
Real Time ◽  
Tomographic Imaging ◽  
Massively Parallel ◽  
Optical Coherence ◽  
X Rays ◽  
Pixel Array ◽  
Smart Pixel ◽  
Parallel Signal Processing

scholarly journals The Use of Optical Coherence Tomography in Dental Diagnostics: A State-of-the-Art Review

2017 ◽  
Vol 2017 ◽  
pp. 1-31 ◽  
Author(s):  
Monika Machoy ◽  
Julia Seeliger ◽  
Liliana Szyszka-Sommerfeld ◽  
Robert Koprowski ◽  
Tomasz Gedrange ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Time Delay ◽  
Internal Structure ◽  
State Of The Art ◽  
Biological Tissues ◽  
Tomographic Imaging ◽  
Optical Coherence ◽  
X Rays ◽  
Analytical Technology

Optical coherence tomography provides sections of tissues in a noncontact and noninvasive manner. The device measures the time delay and intensity of the light scattered or reflected from biological tissues, which results in tomographic imaging of their internal structure. This is achieved by scanning tissues at a resolution ranging from 1 to 15 μm. OCT enables real-time in situ imaging of tissues without the need for biopsy, histological procedures, or the use of X-rays, so it can be used in many fields of medicine. Its properties are not only particularly used in ophthalmology, in the diagnosis of all layers of the retina, but also increasingly in cardiology, gastroenterology, pulmonology, oncology, and dermatology. The basic properties of OCT, that is, noninvasiveness and low wattage of the used light, have also been appreciated in analytical technology by conservators, who use it to identify the quality and age of paintings, ceramics, or glass. Recently, the OCT technique of visualization is being tested in different fields of dentistry, which is depicted in the article.

Spectroscopic optical coherence tomography based on wavelength de-multiplexing and smart pixel array detection

2004 ◽  
Vol 237 (4-6) ◽  
pp. 275-283 ◽  
Author(s):  
Markus Laubscher ◽  
Stéphane Bourquin ◽  
Luc Froehly ◽  
Boris Karamata ◽  
Theo Lasser
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Coherence ◽  
Pixel Array ◽  
Array Detection ◽  
Smart Pixel ◽  
Smart Pixel Array

scholarly journals Acceleration of optical coherence tomography signal processing by multi-graphics processing units

2014 ◽  
Vol 07 (03) ◽  
pp. 1450010 ◽  
Author(s):  
Xiqi Li ◽  
Guohua Shi ◽  
Ping Huang ◽  
Yudong Zhang
Keyword(s):  
Signal Processing ◽  
Optical Coherence Tomography ◽  
Real Time ◽  
Time Domain ◽  
Graphics Processing Units ◽  
High Speed ◽  
Interpolation Method ◽  
Time Signal ◽  
Optical Coherence ◽  
Zero Padding

A multi-GPU system designed for high-speed, real-time signal processing of optical coherence tomography (OCT) is described herein. For the OCT data sampled in linear wave numbers, the maximum processing rates reached 2.95 MHz for 1024-OCT and 1.96 MHz for 2048-OCT. Data sampled using linear wavelengths were re-sampled using a time-domain interpolation method and zero-padding interpolation method to improve image quality. The maximum processing rates for 1024-OCT reached 2.16 MHz for the time-domain method and 1.26 MHz for the zero-padding method. The maximum processing rates for 2048-OCT reached 1.58 MHz, and 0.68 MHz, respectively. This method is capable of high-speed, real-time processing for OCT systems.

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

Sensors ◽  
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.

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