Optical coherence tomography (OCT) is a non-invasive imaging technique that uses low-coherence interferometry to produce high-resolution, cross-sectional images of biological tissues. OCT works by measuring the backscattered light from internal tissue microstructures. The basic setup uses a Michelson interferometer with a broadband light source, such as a superluminescent diode, to capture back-reflected light. There are different types of OCT systems, including time domain OCT, frequency domain OCT, and swept-source OCT. OCT has various medical applications for imaging the eye, skin, and detecting cancer or other abnormalities in human cells.
OCT is a great technology,Many ophthalmologist find very difficult to understand it ,SO I have tired to simplify it as much as possible .Hope everyone can understand now onwards the basic about OCT .
Every feedback s most welcomed sothat i can improve further in coming days
Please email your feedback to me in the following address
yourgyanu@gmail.com
optical coherence tomography is a new tool that makes retinal diagnosis easier. the above ppt includes a detailed and precise notes on OCT and its interpretation.
OCT is a great technology,Many ophthalmologist find very difficult to understand it ,SO I have tired to simplify it as much as possible .Hope everyone can understand now onwards the basic about OCT .
Every feedback s most welcomed sothat i can improve further in coming days
Please email your feedback to me in the following address
yourgyanu@gmail.com
optical coherence tomography is a new tool that makes retinal diagnosis easier. the above ppt includes a detailed and precise notes on OCT and its interpretation.
Recent advances in diagnosis of glaucoma includes all the newer trends in the fields of measuring increased IOP, anterior chamber angle and depth assessment and optic nerve head assessment including RNFL thickness.
Flexible fiberoptic catheter used for light delivery
OCT enhances imaging resolution that may permit the evaluation of clinical (e.g., luminal measurements during PCI) and research (e.g., fibrous cap thickness and strut levelanalysis) parameters for the interventional cardiologist.
Recent advances in diagnosis of glaucoma includes all the newer trends in the fields of measuring increased IOP, anterior chamber angle and depth assessment and optic nerve head assessment including RNFL thickness.
Flexible fiberoptic catheter used for light delivery
OCT enhances imaging resolution that may permit the evaluation of clinical (e.g., luminal measurements during PCI) and research (e.g., fibrous cap thickness and strut levelanalysis) parameters for the interventional cardiologist.
This presentation is mainly focused on the clinical diagnosis and interpretation of oct macula.This is presented on 4th year optometry as topic presentation.
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.
visual prosthesis replicates the natural vision of the eye and are one of the newer innovations in the field of ophthalmology. Helps in degenerative disease like Age related macular degeneration , retinitis pigmentosa etc.
ARTIFICIAL RETINA USING THIN FILM TRANSISTORS DRIVEN BY WIRELESS POWER SUPPLYManiroop Badam
Artificial retinas have been ardently desired to recover the sight sense for sight-handicapped people. We have verified that an artificial retina using poly-Si TFTs can be driven by wireless power supply. It is confirmed that the irradiated light distribution can be reproduced as the output voltage distribution owing to the parameter optimization of the wireless power supply system.
Recent advances in ophthalmology - Dr. Parag Apteparag apte
A full presentation on recent advances in ophthalmology till today. There is not a single presentation on recent advances in ophthalmology in slide share till September 2017. I have tried my best to cover most of the topics so that the lecture gets over in one hour
TECHNICAL TRAINING MANUAL GENERAL FAMILIARIZATION COURSEDuvanRamosGarzon1
AIRCRAFT GENERAL
The Single Aisle is the most advanced family aircraft in service today, with fly-by-wire flight controls.
The A318, A319, A320 and A321 are twin-engine subsonic medium range aircraft.
The family offers a choice of engines
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
Vaccine management system project report documentation..pdfKamal Acharya
The Division of Vaccine and Immunization is facing increasing difficulty monitoring vaccines and other commodities distribution once they have been distributed from the national stores. With the introduction of new vaccines, more challenges have been anticipated with this additions posing serious threat to the already over strained vaccine supply chain system in Kenya.
Democratizing Fuzzing at Scale by Abhishek Aryaabh.arya
Presented at NUS: Fuzzing and Software Security Summer School 2024
This keynote talks about the democratization of fuzzing at scale, highlighting the collaboration between open source communities, academia, and industry to advance the field of fuzzing. It delves into the history of fuzzing, the development of scalable fuzzing platforms, and the empowerment of community-driven research. The talk will further discuss recent advancements leveraging AI/ML and offer insights into the future evolution of the fuzzing landscape.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
COLLEGE BUS MANAGEMENT SYSTEM PROJECT REPORT.pdfKamal Acharya
The College Bus Management system is completely developed by Visual Basic .NET Version. The application is connect with most secured database language MS SQL Server. The application is develop by using best combination of front-end and back-end languages. The application is totally design like flat user interface. This flat user interface is more attractive user interface in 2017. The application is gives more important to the system functionality. The application is to manage the student’s details, driver’s details, bus details, bus route details, bus fees details and more. The application has only one unit for admin. The admin can manage the entire application. The admin can login into the application by using username and password of the admin. The application is develop for big and small colleges. It is more user friendly for non-computer person. Even they can easily learn how to manage the application within hours. The application is more secure by the admin. The system will give an effective output for the VB.Net and SQL Server given as input to the system. The compiled java program given as input to the system, after scanning the program will generate different reports. The application generates the report for users. The admin can view and download the report of the data. The application deliver the excel format reports. Because, excel formatted reports is very easy to understand the income and expense of the college bus. This application is mainly develop for windows operating system users. In 2017, 73% of people enterprises are using windows operating system. So the application will easily install for all the windows operating system users. The application-developed size is very low. The application consumes very low space in disk. Therefore, the user can allocate very minimum local disk space for this application.
Forklift Classes Overview by Intella PartsIntella Parts
Discover the different forklift classes and their specific applications. Learn how to choose the right forklift for your needs to ensure safety, efficiency, and compliance in your operations.
For more technical information, visit our website https://intellaparts.com
1. A PRESENTATION ON
OCT
(OPTICAL COHERENCE TOMOGRAPHY)
PREPARED BY
PUNEET SINGH THAKUR
IET DAVV (INDORE)
DIGITAL INSTRUMENTATION
ROLL NO.- DI15719
"There is a crack in everything. That's how the light goes in" 1
2. What is OCT ?
OCT basically refers to Optical coherence tomography. It is a non
contact, non destructive technique for 3D imaging of engineering and
bio medical samples.
OCT is a new type of optical imaging technology perform high
resolution cross section tomography imaging of the internal
microstructure in a material and biological system by measuring
backscattered or beck reflected light.
"There is a crack in everything. That's how the light goes in" 2
3. Basic Principle
• For biomedical engineering OCT use low-coherence interferometry to
produce a two or three dimensional image of optical scattering from
internal tissue microstructures.
• OCT is basically based on the interference phenomenon of light.
• For the basic setup of OCT we use “Michaelson Interferometer”.
Sample is to be analyse is placed on one of the arm of the
interferometer.
• But the source we use for the OCT is SLED, that is a Broad band
source preferred for depth scanning.
"There is a crack in everything. That's how the light goes in" 3
4. Component
Mirror
CCD or CMOS camera
Superluminescent Emitting Diode (SLED)
(800-1300nm, 5mW)
• The unique property of Superluminescent diodes (SLD) is the
combination of laser-diode-like output power and brightness with
broad LED-like optical spectrum. Such combination is allowed by
high optical gain in semiconductor laser materials and its wide optical
spectrum
"There is a crack in everything. That's how the light goes in" 4
6. Grating
• Any periodic perturbation is generally refers as grating. Here when we
consider Fourier domain OCT we will deal with Diffraction grating.
• Diffraction grating is an optical component with a periodic structure,
which reflect the light into several beams travelling in different
direction.
"There is a crack in everything. That's how the light goes in" 6
8. Michaelson interferometer
"There is a crack in everything. That's how the light goes in" 8
Condition for Maxima
Path difference ∆x=nλ
Condition for minima
Path difference ∆x=(2n+1)λ/2
9. Basic Set Up for OCT
"There is a crack in everything. That's how the light goes in" 9
10. Type Of OCT
1. Time Domain OCT
2. Frequency domain OCT
3. Swept Source OCT
"There is a crack in everything. That's how the light goes in" 10
13. Swept source OCT
"There is a crack in everything. That's how the light goes in" 13
RF Generator Frequency changed from 87
to 95 MHz with the step of 0.1 MHz
14. OCT of a fingertip pattern
"There is a crack in everything. That's how the light goes in" 14
15. Important Parameter
• Depth resolution-:
The larger the bandwidth of the source in TD-OCT and SB-OCT and the
wider the tuning bandwidth in SS-OCT, the better the depth resolution
is.
• Penetration depth-:
Due to scattering and absorption in the examined object, the number of
photons in the backscattered wave conserving stable phase relations to
the photons in the incident wave reduces with depth.
"There is a crack in everything. That's how the light goes in" 15
16. • Wavelength range-:
Biomedical optics requires imaging within the therapeutic window,
situated between 600 and 1000 nm, where the main constituents of the
tissue exhibit low absorption.
• Power to the object -:
In scanning regime, safety standards allow: 0.7 mW at the cornea for
imaging the retina of the human eye at 830 nm and up to 2 mW at 1060
nm ;15 mW in imaging the anterior chamber at 1300 nm and larger
power when imaging internal structures and skin.
"There is a crack in everything. That's how the light goes in" 16
17. Limitations
• Penetration: 2-3mm Ideal: 4mm
• Acquisition rate: <10frames/second
• Lack of large-scale clinical trials
"There is a crack in everything. That's how the light goes in" 17
18. Advantages
• Non contact
• Non destructive
• Non invasive
• Broad dynamic range
• No preparation of the sample or subject
• No ionizing radiation
• High resolution (1 to 15 μm)
• It can be implemented compact fiber optic components and integrated
with wide range of medical instrument.
"There is a crack in everything. That's how the light goes in" 18
20. Biomedical application
Detection of malignancy in human cells
Eye imaging
Skin imaging
"There is a crack in everything. That's how the light goes in" 20
21. References
• https://www.researchgate.net/publication/37438932_Optical_Coherence_Tomogra
phy-Principles_and_Applications
• Smart optical coherence tomography for ultra-deep imaging through highly
scattering media Amaury Badon, Dayan Li, Geoffroy Lerosey, Albert C. Boccara,
Mathias Fink, and Alexandre Aubry Institut Langevin, ESPCI ParisTech, PSL
Research University,CNRS UMR 7587, 1 rue Jussieu, 75005 Paris, France (Dated:
October 19, 2015)
• http://www.sciencedirect.com/science/article/pii/S0939388909001524
• J.G. Fujimoto “Optical Coherence Tomography: Technology and Application”
IEEE 2002
• Simultaneous topography and tomography of latent fingerprints using full-field
swept-source optical coherence tomography by Satish Kumar Dubey1, Dalip
Singh Mehta1, Arun Anand2 and Chandra Shakher1, JOURNAL OF OPTICS
A: PURE AND APPLIED OPTICS , 10 (2008) 015307 (8pp)
"There is a crack in everything. That's how the light goes in" 21