ROUB EXAMS SCRIPT UPDATED QUESTIONS AND ANSWERS
GRADED A+
✔✔Gain - ✔✔The degree of echo amplification performed by an ultrasound system
✔✔Gates - ✔✔Markers or cursors displayed on the screen of an ultrasound instrument
thtat provide electronic measurements of the distance between two or more acoustic
interfaces.
✔✔Hertz - ✔✔A unit of frequency equal to one cycle per second
✔✔Initial line - ✔✔The first echo in a B-scan echogram, representing the probe tip,
which is always present on the screen display.
✔✔IOL Constant - ✔✔A value assigned by the manufacturer that corresponds to the
anticipated position of the lens implant within the eye.
✔✔Multiple Signals - ✔✔Artifactual echoes caused by reverberations of the sound
waves.
✔✔Optic - ✔✔The portion of an intraocular lens implant that transmits light to the retina
✔✔Optical zone - ✔✔The true center of the cornea from which keratometry readings for
intraocular lens power calculations are obtained.
✔✔Piezo-electric element - ✔✔A component of an ultrasound probe that converts
electrical to mechanical energy and vice-versa
✔✔Reflectivity - ✔✔The relative strength or amplitude of an echo that is created when
sound waves bounce back from an interface
✔✔Regression Formula - ✔✔An IOL power formula wihch is empirical, based on the
retrospective analysis of actual postperative refractive date
✔✔Resolution - ✔✔The capability of an ultrasound instrument to display two or more
interfaces as separate echoes
✔✔Reticle - ✔✔The cross hair located within the focusing mire of a keratometer
✔✔Sensitivity - ✔✔The capability of an ultrasound instrument to detect echoes
✔✔Shadowing - ✔✔An absense or a marked reduction in the strength (amplitude) of
echoes located posterior to an interface or medium due to very strong sound
attenuation
GRADED A+
✔✔Gain - ✔✔The degree of echo amplification performed by an ultrasound system
✔✔Gates - ✔✔Markers or cursors displayed on the screen of an ultrasound instrument
thtat provide electronic measurements of the distance between two or more acoustic
interfaces.
✔✔Hertz - ✔✔A unit of frequency equal to one cycle per second
✔✔Initial line - ✔✔The first echo in a B-scan echogram, representing the probe tip,
which is always present on the screen display.
✔✔IOL Constant - ✔✔A value assigned by the manufacturer that corresponds to the
anticipated position of the lens implant within the eye.
✔✔Multiple Signals - ✔✔Artifactual echoes caused by reverberations of the sound
waves.
✔✔Optic - ✔✔The portion of an intraocular lens implant that transmits light to the retina
✔✔Optical zone - ✔✔The true center of the cornea from which keratometry readings for
intraocular lens power calculations are obtained.
✔✔Piezo-electric element - ✔✔A component of an ultrasound probe that converts
electrical to mechanical energy and vice-versa
✔✔Reflectivity - ✔✔The relative strength or amplitude of an echo that is created when
sound waves bounce back from an interface
✔✔Regression Formula - ✔✔An IOL power formula wihch is empirical, based on the
retrospective analysis of actual postperative refractive date
✔✔Resolution - ✔✔The capability of an ultrasound instrument to display two or more
interfaces as separate echoes
✔✔Reticle - ✔✔The cross hair located within the focusing mire of a keratometer
✔✔Sensitivity - ✔✔The capability of an ultrasound instrument to detect echoes
✔✔Shadowing - ✔✔An absense or a marked reduction in the strength (amplitude) of
echoes located posterior to an interface or medium due to very strong sound
attenuation
