ROUB Study Guide Updated Exam With
Actual Questions And Verified Answers
| Latest 2026/ 2027| 100% Success
What is produced when a sound beam encounters an interface? - Correct Answer -Echo
What is the term for a diagnostic medical image created using ultrasound echo (sonographic)
equipment? - Correct Answer -Echogram or sonogram
What type of sound beam is produced using a concave-shaped element in the transducer of the
probe? - Correct Answer -Focused beam
What is a quantitative A-scan? - Correct Answer -A quantitative A-scan determines the size and
uses ultrasound characteristics to determine types of masses in the eye
A flat-shaped element in the transducer will produce what type of sound beam? - Correct
Answer -Non-focused
What unit of frequency is equal to one cycle per second? - Correct Answer -Hertz
,What unit measures the intensity of ultrasound? - Correct Answer -Decibels (db)
A higher frequency with less penetration produces what type of resolution? - Correct Answer -
Greater
In what medium do ultrasound waves travel slowly? - Correct Answer -Liquid
What is the velocity of the crystalline lens? - Correct Answer -1641 m/sec
What is the velocity of an aphakic eye - Correct Answer -1534 m/sec
What is the velocity of a phakic eye? - Correct Answer -1532 m/sec
What type of pseudophakic lens has a velocity of 2780 m/sec - Correct Answer -Polymethyl
methacrylate (PMMA)
What is the velocity of the retina? - Correct Answer -1550 m/sec
What is the sound velocity of glass? - Correct Answer -6040 m/sec
,What is the result of the sound velocity of a medium multiplied by its density? - Correct Answer
-Acoustic impedence
What is the effect of using higher gain on system sensitivity? - Correct Answer -Higher gain
decreases resolution
What is the term for the number of oscillations of sound waves per unit of time? - Correct
Answer -Frequency
What is the term for relative strength or amplitude of an echo that is created when sound
waves bounce back from an interface? - Correct Answer -Reflectivity
The time required for the sound waves to travel from the cornea to the retina and then return
to the probe is called "the measurement of time" and is calculated by what formula? - Correct
Answer -Velocity (distance = velocity x time ÷ 2) or (D=VxT/2)
Which medium produces a higher echo: a course retinal surface or a smooth retinal surface? -
Correct Answer -Smooth retinal surface
, A lower reflective echo is a result of that type of sound beam incidence? - Correct Answer -
Oblique
The highest reflective echo can be achieved when the sound beam is in what position in relation
to the acoustic interface? - Correct Answer -Perpendicular
What is the term for the degree of echo amplification performed by the ultrasound machine? -
Correct Answer -Gain
How is gain measured? - Correct Answer -In decibels (db)
What setting determines the effective width of the sound beam? - Correct Answer -Gain
What is the effect of using higher gain on resolution? - Correct Answer -Higher gain decreases
resolution
If the sound beam is at the widest point, what is the setting of the gain? - Correct Answer -
Maximum
If the sound beam is at the narrowest point, what is the setting of the gain? - Correct Answer -
Minimum
Actual Questions And Verified Answers
| Latest 2026/ 2027| 100% Success
What is produced when a sound beam encounters an interface? - Correct Answer -Echo
What is the term for a diagnostic medical image created using ultrasound echo (sonographic)
equipment? - Correct Answer -Echogram or sonogram
What type of sound beam is produced using a concave-shaped element in the transducer of the
probe? - Correct Answer -Focused beam
What is a quantitative A-scan? - Correct Answer -A quantitative A-scan determines the size and
uses ultrasound characteristics to determine types of masses in the eye
A flat-shaped element in the transducer will produce what type of sound beam? - Correct
Answer -Non-focused
What unit of frequency is equal to one cycle per second? - Correct Answer -Hertz
,What unit measures the intensity of ultrasound? - Correct Answer -Decibels (db)
A higher frequency with less penetration produces what type of resolution? - Correct Answer -
Greater
In what medium do ultrasound waves travel slowly? - Correct Answer -Liquid
What is the velocity of the crystalline lens? - Correct Answer -1641 m/sec
What is the velocity of an aphakic eye - Correct Answer -1534 m/sec
What is the velocity of a phakic eye? - Correct Answer -1532 m/sec
What type of pseudophakic lens has a velocity of 2780 m/sec - Correct Answer -Polymethyl
methacrylate (PMMA)
What is the velocity of the retina? - Correct Answer -1550 m/sec
What is the sound velocity of glass? - Correct Answer -6040 m/sec
,What is the result of the sound velocity of a medium multiplied by its density? - Correct Answer
-Acoustic impedence
What is the effect of using higher gain on system sensitivity? - Correct Answer -Higher gain
decreases resolution
What is the term for the number of oscillations of sound waves per unit of time? - Correct
Answer -Frequency
What is the term for relative strength or amplitude of an echo that is created when sound
waves bounce back from an interface? - Correct Answer -Reflectivity
The time required for the sound waves to travel from the cornea to the retina and then return
to the probe is called "the measurement of time" and is calculated by what formula? - Correct
Answer -Velocity (distance = velocity x time ÷ 2) or (D=VxT/2)
Which medium produces a higher echo: a course retinal surface or a smooth retinal surface? -
Correct Answer -Smooth retinal surface
, A lower reflective echo is a result of that type of sound beam incidence? - Correct Answer -
Oblique
The highest reflective echo can be achieved when the sound beam is in what position in relation
to the acoustic interface? - Correct Answer -Perpendicular
What is the term for the degree of echo amplification performed by the ultrasound machine? -
Correct Answer -Gain
How is gain measured? - Correct Answer -In decibels (db)
What setting determines the effective width of the sound beam? - Correct Answer -Gain
What is the effect of using higher gain on resolution? - Correct Answer -Higher gain decreases
resolution
If the sound beam is at the widest point, what is the setting of the gain? - Correct Answer -
Maximum
If the sound beam is at the narrowest point, what is the setting of the gain? - Correct Answer -
Minimum
