Ultrasonography is a non-invasive imaging technique used to examine the eye. The B-scan was developed in the 1950s and 1960s and allows cross-sectional imaging of the eye. It works by emitting high frequency soundwaves into the eye and receiving echoes to create images. The B-scan examines features such as lesions through their shape, location, texture and mobility. Proper technique is required for high quality images, including centering lesions and using an appropriate probe frequency and gain. B-scans are useful for diagnosing various pathologies by comparing features to normal anatomical structures.
We can ultimately aim to obtain “optical biopsies” of cornea with the introduction of high resolution AS-OCT .
AS-OCT helps assess tissue anatomy and evaluate differences in cellular morphology and patterns to distinguish between divergent anterior segment conditions.
The presentation I have made and uploaded provides you with an in-depth insight into the patterns the strabismus may take following anomalies of extraocular muscles, deformities of the orbital structures,innnervational disturbances.
The author does not assume responsibility or legal liability for any errors in the text or for the misuse or misapplication of material in this work.
No copyright infringement, or plagiarism intended.
Amrit Pokharel
We can ultimately aim to obtain “optical biopsies” of cornea with the introduction of high resolution AS-OCT .
AS-OCT helps assess tissue anatomy and evaluate differences in cellular morphology and patterns to distinguish between divergent anterior segment conditions.
The presentation I have made and uploaded provides you with an in-depth insight into the patterns the strabismus may take following anomalies of extraocular muscles, deformities of the orbital structures,innnervational disturbances.
The author does not assume responsibility or legal liability for any errors in the text or for the misuse or misapplication of material in this work.
No copyright infringement, or plagiarism intended.
Amrit Pokharel
Ocular Ultrasound is an ultrasound for eyes that uses high frequency sound waves to get detailed pictures of your eye and it's orbit. This procedure is usually done by Ophthalmologists.
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The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
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Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
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An EFL lesson about the current events in Palestine. It is intended to be for intermediate students who wish to increase their listening skills through a short lesson in power point.
Biological screening of herbal drugs: Introduction and Need for
Phyto-Pharmacological Screening, New Strategies for evaluating
Natural Products, In vitro evaluation techniques for Antioxidants, Antimicrobial and Anticancer drugs. In vivo evaluation techniques
for Anti-inflammatory, Antiulcer, Anticancer, Wound healing, Antidiabetic, Hepatoprotective, Cardio protective, Diuretics and
Antifertility, Toxicity studies as per OECD guidelines
1. B SCAN
Moderator :- Dr. Supreet Juneja Presentor:- Dr.Pushkar Dhir
2. D 4 CONCEPTS
1. How Bscan came into existence?
2. Concept of Frequency.
3. Concept of Gain.
3. ULTRASONOGRAPHY
• Non-invasive, efficient and inexpensive diagnostic tool.
• Examiner- dependent
• Expertise
• A correlation with clinical findings is essential to make a
diagnosis.
.
4. • 1793: Lazzaro Spallanzani (Italy) discovered that bats
orient themselves with the help of sound whistles while
flying in darkness. This was the basis of modern ultrasound
application
5. • 1956: Mundt and Hughes -
first used the A-scan technique.
• 1958: Baum and Greenwood
- B-scan (immersion method)
• 1962:Oksala and Lehtinen
further refined the technique
• In the sixties, imaging of the
eyeball and
orbit using ultrasound was
popularised by Ossoining.
11. PRINCIPLE OF
ULTRASOUND
VELOCITY REFLECTIVITY
ANGLE OF
INCIDENCE
ABSORPTION
•USG wave has a
frequency > 20 kHz.
•Wavelength α Depth
of penetration of the
ultrasound.
•Larger d frequency
= short wavelength
= shallow penetration
= better resolution
• Sound travels
faster through
solids than
liquids.
•Velocity of
sound wave is
depends on
the density of
the media .
•Vitreous 1532
m/s
•Cornea speed
of 1,641 m/s
• Greater the
density
difference at
interface,
stronger the
echo/higher the
reflectivity
• The stronger
the echo, the
higher the spike
•The stronger the
echo, the
brighter the dot.
• Perpendicular
d probe to the
area of interest,
=more of the
echo is reflected
directly back into
the probe tip.
= brighter d spot.
• More dense
the medium,
the greater the
amount of
absorption.
•B-scan should
be performed
on the open
eye unless the
patient is a
small child or
has an open
wound
12. PTR before doing Bscan
• For Best B scan results :-
– Put the Probe directly on globe ( improve resolution and
determine the patient gaze)
– Coupling jelly applied to probe tip
– In cases of suspected infection cover the probe tip with cling
film
– Clean the probe tip with alcohol wipe after every use.
13. REQUISITE 4 HIGH QUALITY
BSCAN
1. Lesion Must be Placed in the centre
2. Beam must be directed perpendicular to the surface
of interest
3. Lowest Possible decibel gain that is consistent with
adequate mantainence of intensity and resolution of
lesion.
29. Normal B-scan
• Cornea, AC and the anterior capsule-not easily visualised without immersion technique
• Lens –oval high reflective structure
• Vitreous- acoustically clear
• Retina, choroid and sclera-seen together as a high reflective structure
• Sclera – 100% reflective
• Optic nerve-wedge shaped acoustic void in retrobulbar space on axial scan
• Extraocular muscles-echolucent to low reflective fusiform orbital structures
32. PVD
RETINA
DETACHMENT
CHOROID
DETACHMENT
SHAPE Linear
LOCATION
ATTCH. TO ON Variable Yes No
OTHER Thicker inferiorly Folds/Breaks Vortex Vein
SPIKE HT. 40-90% 80-100% 90-100%
SPIKE PEAKS Single Single
Double / M shape
peak
MOBILITY
Marked (Hammock
like)
Moderate Minimal
AFTER MOVMT. Marked
Moderate to
severe
Absent
33.
34.
35.
36.
37.
38.
39.
40.
41.
42.
43.
44. References
• Most of the photographs and pics hav been
taken from Textbook of Ophthalmic
Ultrasound by Hatem R. Aata WITHOUT
PRIOR PERMISSION.
46. “ Thank you for listening B scan”
• THANK YOU EVERYONE FOR PATIENTLY LISTENING TO THIS SEMINAR.
• For feedbacks & brickbats plz mail at
• ykush@yahoo.co.in./drdhir2014@gmail.com