ultra_sonografia_2015-01-14_12-13-21.pdf

usg mata

1. How to Obtain a Good
Ultrasound
Arief Wildan
Faculty of Medicine Diponegoro University - Kariadi General
Hospital
Semarang

2. Ophthalmic
Ultrasound
•Uses high-frequency sound waves,
•which are transmitted from a
probe into the eye.
•they are reflected back to the
probe and converted into an
electric signal.
•the signal is subsequently
reconstructed as an image on a
monitor.
Emedicine

3. Frequency
Abdominal
1 - 5 MHz
Ophthalmic
8 - 10 MHz
UBM
20 - 50 Mhz

4. Indication
Complete or partial
opacification of the
media
either the anterior or
posterior segment.
Clear media
the differentiation and
measurement of
intraocular tumors and
inflammatory lesions.

5. Patient and Examiner
Position
Patient position
Recline
Sitting
Topical anesthetic
drops are applied
Examiner
To the patient’s right

6. Type of scan
A scan
A one-dimensional acoustic display
in which echoes are represented
as vertical spikes from a baseline.
B scan
produces a two-dimension
indicate configuration and location
Simultaneous B scan with A scan
Ryan

7. Probe
MARKER
Always at the top of the screen

8. Three primary B-scan probe
orientations.
Transversal
Longitudinal
Axial

9. Transversal
•The probe is placed
parallel to the limbus

•Marker is placed at nasal
side or superior side

•No optic nerve showed
Temporal Nasal

10. 09.00 03.00
12.00
12.00
03.00
09.00
Nasal Temporal

11. 12.00
09.00
06.00
12.00
09.00
06.00
Temporal Nasal

13. Longitudinal
Probe at the limbus
perpendicular position
Ant - post evaluation
ON always at inferior

14. 03.00
12.00
09.00
12.00
03.00 09.00
optic nerve

15. Axial
•Through cornea
•Pass through lens and ON
•Vertical, horizontal or
oblique
•To see the location related
to the landmark (lens and
ON)
•Macula evaluation
Nasal Temporal

16. Axial
Nasal Temporal
12.00
06.00

17. Technique
Topographic
Transversal
Nasal, inferior, temporal
and superior.
IF lesion found then do
longitudinal
Axial
Vertical and horizontal

18. Technique
Quantitative
to estimate the
reflectivity (i.e. spike
height)
Once the sound beam
is directed
perpendicular to a
lesion,

19. Technique
Kinetic
After movement
mobility
a nonsolid lesion (e.g. PVD
or RD) displays after
movement
a solid lesion (e.g. tumor)
does no after movement
Vascularity
Blood flow

20. Abnormal echo source
Membrane like lesion
Point like lesion
Mass like lesion

21. Membrane like lesion
Retinal detachment, PVD and CD
Ryan

22. PVD

23. Retinal detachment

24. Choroidal detachment
Dome shape
After movement : mild / (-
)
Double peak A scan
Lack attachment to ON

25. Point like lesion
Vitreous Hemorrhage
low - medium spike

26. Mass like lesion

27. Mass like lesion
Choroidal melanoma.
Homogeneous cellular tissue
produces regular structure
low internal reflectivity.
Choroidal hemangioma.
Multiple, small vascular spaces
produce regular structure
high reflectivity.
Metastatic carcinoma.
Irregular accumulation of tumor
cells
irregular internal structure (i.e.
variable reflectivity).

28. THANK YOU

29. QUIZ
12.00
09.00 03.00
06.00
A
B C
D