This document contains 20 multiple choice questions about B-scan ultrasonography. B-scan is a non-invasive imaging technique used to diagnose various ocular conditions. It uses high frequency sound waves between 2-30 MHz to generate images of the internal structures of the eye. The questions cover topics like the principles of B-scan imaging, its use in evaluating conditions like retinal detachment and intraocular foreign bodies, and identifying structures in B-scan images like the vitreous cavity and choroidal melanoma.

1. B scan MCQs for MLOPs

2. 1. In B-Scan, ‘B’ stands for
A. Brightness
B. Brilliance
C. Blue
D. Bold

3. 2. What is the frequency of sound waves used in B-Scan ultrasonography?
A. 8 – 10 MHz
B. 18 – 20 MHz
C. 20 – 30 MHz
D. 2 – 5 MHz

4. 3. Which of the following statement is false?
A. B scan is a non-invasive examination tool
B. B scan is cost effective
C. B scan is used to diagnose corneal disorders
D. B scan uses a piezo electric crystal

5. 4. The sound wave velocity is the fastest through which of the following medium?
A. Silicone oil
B. Vitreous
C. Crystalline lens
D. Air

6. Sound wave velocities
Medium Velocity (m/sec)
Water 1480
Aqueous/ vitreous 1532
Soft tissue 1550
Cornea/ Crystalline lens 1641
Air 330
Silicone oil (1000cst) 987

7. 5. B scan can be used to diagnose all of the following conditions except?
A. Retinal detachment
B. Retinoblastoma
C. Vitreous haemorrhage
D. Macular edema

8. 6. A 60 years old male gives a history of left eye injury while working with hammer
and chisel. What does the B scan image given below show?
A. Retinal detachment
B. Intra ocular foreign body
C. Dislocated lens
D. Choroidal detachment

9. 7. A 50 years old female presented with complaints of right eye defective vision for
10 days. She gives a history of undergoing cataract surgery 1 week back. B scan can
be used in this situation to evaluate which of the following?
A. Dislocated IOL
B. Retinal detachment
C. Endophthalmitis
D. All of the above

10. 8. What type of B scan is shown in the below picture?
A. Axial
B. Transverse
C. Longitudinal
D. None of the above

11. 9. What is the direction of marker on probe in horizontal transverse scan?
A. Superior
B. Nasal
C. Inferior
D. Temporal

13. 10. What type of scan is shown in the below picture?
A. Vertical transverse
B. Longitudinal scan
C. Horizontal transverse
D. Vertical axial

14. 11. A 60 years old male patient presents with defective vision in his left eye for 2
months. There is no redness or pain. There is no history of trauma. His B scan
image is shown below. Which of these tests you do next? (select all that apply)
A. RBS
B. BP
C. Both A and B
D. Blood culture

15. 12. Which of the following is not an indication for B scan?
A. Corneal opacity
B. Vitritis
C. Hyphema
D. CNVM

16. 13. A 70 years old male patient presents with mature cataract in his right eye.
Which of the following investigation would you do?
A. OCT
B. B scan
C. HFA
D. Color vision

17. 14. Identify the ocular structure marked (yellow arrow) in the image given below?
A. Macula
B. Optic nerve
C. Lens
D. Vitreous cavity

18. 15. A 50 years old female patient recently underwent a complicated cataract
surgery in her left eye. What is shown in the image below?
A. Retinal detachment
B. Dislocated IOL
C. Lens cortex drop
D. Choroidal detachment

19. 16. A 60 years old male patient came with complaints of defective vision in his right
eye for 3 months. The image give below is his B scan. What is the diagnosis?
A. Retinal detachment
B. PVD
C. Choroidal detachment
D. None of the above

20. Differentiation of PVD, RD and CD
TECHNIQUE PVD RD CD
Topographic Smooth, open
funnel with or
without disc or
fundus
insertion.
Smooth or
folded, open or
closed funnel
with disc
insertion.
Smooth, dome
or flat ; no disc
insertion.
Quantitative Variable spike
height.
Steeply rising
100% high
spike.
Steeply rising,
thick, double
peaked 100%
high spike.
Kinetic Marked to
moderate
Moderate to
none
Mild to none

21. 17. A 20 years old female patient came with complaints of defective vision in her
right eye for 15 days. She also gave history of redness and pain in her right eye.
What is the diagnosis?
A. Anterior uveitis
B. Posterior scleritis
C. Vitritis
D. All of the above

22. 18. A 55 years old male patient came with complaints of defective vision in his left
eye for 3 months. The B scan shows a mass lesion. What is the most probable
diagnosis?
A. Retinoblastoma
B. Choroidal melanoma
C. Choroidal osteoma
D. Retinocytoma

23. Choroidal Melanoma
• Solid consistency
• Collar button/ mushroom shape
• Low to medium internal reflectivity
• Regular internal structure
• Internal blood flow
• Sound attenuation

24. 19. A 30 years old male patient came with complaints of defective vision in his left
eye for 3 days. He suffered an injury to his right eye with a cricket ball 3 days back.
What is the diagnosis?
A. Dislocated IOL
B. Dislocated lens
C. Vitreous hemorrhage
D. Intraocular foreign body

25. 20. All are true regarding the choroidal osteoma depicted in the picture except?
A. High internal reflectivity
B. Poor sound attenuation
C. Smooth/ flat apperance
D. High reflectivity on A-scan

26. • The image shows choroidal osteoma. It has
1. High internal reflectivity
2. Strong sound attenuation
3. Smooth/ flat apperance
4. High reflectivity on A-scan