This document summarizes a seminar on optical coherence tomography (OCT). OCT uses low-coherence interferometry to produce high-resolution, cross-sectional tomographic images of internal tissue microstructures. It has advantages over other imaging modalities like high resolution, rapid acquisition, and small catheter designs. The document outlines OCT applications in fields like cardiology, dermatology, and gastroenterology. It also discusses current limitations and future work to improve penetration depth, resolution, and acquisition rates to further clinical applications.
Lasers in otolaryngology is an important topic for both undergraduate and postgraduate ENT students. Dr Krishna Koirala has explained this in details in this lecture.
Lasers in otolaryngology is an important topic for both undergraduate and postgraduate ENT students. Dr Krishna Koirala has explained this in details in this lecture.
OPTICAL COHERENCE TOMOGRAPHY (SKIN OCT)....
Optical coherence tomography (OCT) is an established medical imaging technique that uses light to capture micrometer-resolution, three dimensional images from within optical scattering media (e.g., biological tissue). Optical coherence media (e.g., biological tissue). Optical coherence tomography is based on low coherence interferometry, typically employing near-infrared light. The use of relative long wavelength light allows it to penetrate into the scattering medium. Confocal microscopy, another optical technique, typically penetrates less deeply into the sample but with higher resolution.
A 4 part seminar on 3D cbct technology for seminar presentations. with added technical details and considerations with differences between a CT technology.
Also it features the technical parameters ,uses and how it is considered useful in each departments of medicine and dentistry.
Optical Coherence Tomography: Technology and applications for neuroimagingManish Kumar
Optical coherence tomography (OCT) is an emerging imaging technology with applications in biology, medicine, and materials investigations. Attractive features include high cellular-level resolution, real-time acquisition rates, and spectroscopic feature extraction in a compact noninvasive instrument. OCT can perform ‘‘optical biopsies’’ of tissue, producing images approaching the resolution of histology without having to resect and histologically process tissue specimens for characterization and diagnosis.
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In this insightful webinar, Inflectra explores how artificial intelligence (AI) is transforming software development and testing. Discover how AI-powered tools are revolutionizing every stage of the software development lifecycle (SDLC), from design and prototyping to testing, deployment, and monitoring.
Learn about:
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Builder.ai Founder Sachin Dev Duggal's Strategic Approach to Create an Innova...Ramesh Iyer
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GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using Deplo...James Anderson
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The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
The software team must secure its software delivery process to avoid vulnerability and security breaches. This needs to be achieved with existing tool chains and without extensive rework of the delivery processes. This talk will present strategies and techniques for providing visibility into the true risk of the existing vulnerabilities, preventing the introduction of security issues in the software, resolving vulnerabilities in production environments quickly, and capturing the deployment bill of materials (DBOM).
Speakers:
Bob Boule
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Transcript: Selling digital books in 2024: Insights from industry leaders - T...BookNet Canada
The publishing industry has been selling digital audiobooks and ebooks for over a decade and has found its groove. What’s changed? What has stayed the same? Where do we go from here? Join a group of leading sales peers from across the industry for a conversation about the lessons learned since the popularization of digital books, best practices, digital book supply chain management, and more.
Link to video recording: https://bnctechforum.ca/sessions/selling-digital-books-in-2024-insights-from-industry-leaders/
Presented by BookNet Canada on May 28, 2024, with support from the Department of Canadian Heritage.
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Neuro-symbolic (NeSy) AI is on the rise. However, simply machine learning on just any symbolic structure is not sufficient to really harvest the gains of NeSy. These will only be gained when the symbolic structures have an actual semantics. I give an operational definition of semantics as “predictable inference”.
All of this illustrated with link prediction over knowledge graphs, but the argument is general.
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Pradeep Chinnala, Senior Consultant Automation Developer @WonderBotz and UiPath MVP
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GraphRAG is All You need? LLM & Knowledge GraphGuy Korland
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https://arxiv.org/abs/2306.08302
2. Microsoft Research's GraphRAG paper and a review paper on various uses of knowledge graphs:
https://www.microsoft.com/en-us/research/blog/graphrag-unlocking-llm-discovery-on-narrative-private-data/
2. CONTENT
Introduction
What is OCT
Advantage of OCT
Nowadays and future equipment
Needle for OCT
OCT in Nontransparent Tissue
OCT application
Limitation
Future works
Underway work
Extention and application of OCT
Market
Conclusion
References
3. INTRODUCTION
Optical coherence tomography (OCT) is a fundamentally
new type of optical imaging modality.
OCT performs high-resolution, cross-sectional
tomographic imaging of the internal microstructure in
materials and biologic systems by measuring
backscattered or backreflected light.
4. WHAT IS OCT(OPTICAL COHERENCE
TOMOGRAPHY)?
OCT use low-coherence interferometry to produce a
two or three dimensional image of optical scattering
from internal tissue microstructures.
Michelson interferometer is used to perform low-
coherence interferometry
OCT measures intensity of reflected infrared light.
7. ADVANTAGE OF OCT
Broad dynamic range,
High resolution
Rapid data acquisition rate,
Small inexpensive catheter/endoscope design
Compact portable structure
(fiber optically based, making possible the development
of small catheters and endoscopes)
The frame rate for OCT systems are four to eight frames
per second.(assume an image size of 256 by 512 pixels.)
8. NOWADAYS AND FUTURE EQUIPMENT
Not available for sale
Pending 510(k)
DISPLAY
AND
KEYBOARD
INTEROMETER
ELECTRONICS
AND
OPTICS
+COMPUTER
FIBEROPTIC PROBE
•Low-coherence
Superluminescent
diode:800 –1300 nm
center waveength
and severl milliwatts
power.
10. OCT IN NONTRANSPARENT TISSUE
A epiglottis
B arterial layers
C atherosclerotic plaques
11. OCT APPLICATION
A Reduce High False-
Negative Rates
B Reduce Biopsy Hazardous
Applied in guiding
microsurgical procedure
Esophagus & epithelium & early
cancer Vulnerable plaque
Prostate
12. LIMITATION
Penetration: 2-3mm Ideal: 4mm
Resolution :
catheter/endoscope based image: 10μm, noncatheter: 4 μm,
1. femtosecond laser is expensive (1 μm)
2. transverse resolution needs to be similar to axial
resolution, below 10 μm need short confocal parameter
which results in the focus falling off rapidly.
Acquisition rate: <10franes/second
Lack of large-scale clinical trials
13. FUTURE WORKS
Penetration and Resolution:
1. Need to develop with similar median wavelength,
power, and bandwidth to those of the mode locked laser.
2. Need more complex catheter/ endoscope designs to
alleviate the focus falling off rapidly.
Acquisition rates: video rate is anticipated with future
embodiments.
14. UNDERWAY WORK
Combine OCT with Doppler velocimetry and
measurement of birefringence properties.
The potential of giving OCT the ability to make both
structural and dynamic assessments.
15. EXTENTION AND APPLICATION OF OCT
Name Work Research Application
Dr. Zhongping Chen University of
California, Irvine
Doppler OCT studying blood vessel function and fluid
flow, generally in small structures.
Dr. Johannes de
Boer
Massachusetts
General Hospital
(MGH)
polarization-sensitive
OCT
diagnosing burns and guiding appropriate
treatment
Dr. Brett Bouma and
Dr. Guillermo
Tierney
MGH very portable, high-
performance OCT
systems for clinical
diagnostic studies
major clinical investigations are ongoing in
the fields of gastroenterology, dermatology,
cardiology, urology, orthopedics, gynecology,
and otolaryngology.
16. MARKET
Imalux Corporation: leader
potential of OCT marketing is $2.5 billion in annual
revenue
OCT will result in a multi-application industry similar
to the path taken by ultrasound.
markets of gastroenterology, urology, and gynecology
represent revenue potential of $781 million.
17. CONCLUSION
OCT can perform a type of optical biopsy, the micron-
scale imaging of tissue morphology in situ and in real
time.
Image information is available immediately without the
need for excision and histologic processing of a
specimen.
The development of high-resolution and high-speed OCT
technology as well as OCT compatible
catheter/endoscopes and other delivery systems represent
enabling steps for many future OCT imaging clinical
applications.