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SPI PRACTICE QUESTIONS AND ANSWERS 100%CORRECT | UPDATED 2024-2025
what improves temporal resolution - ANSWER low line density, high frame
rate, narrow sector line, fewer pulse per frame
which of the following is true when the dynamic aperature is increased -
ANSWER near zone length increases
Which of the following is the standard protocol for digital imaging that allows
compatibility and communication between computers, workstations, and network
hardware provided by various manufacturers of CT, MRI, and ultrasound -
ANSWER DICOM
the beam of an unfocused transducer diverges in the - ANSWER fraunhofer
zone
A technique that uses an ensemble of pulses to improve penetration and contrast
resolution. - ANSWER coded excitation
The Doppler shift frequency is - ANSWER directly proportional to the velocity
of the reflector
A non-English-speaking patient presented for an ultrasound-guided breast biopsy
in which an informed consent is required. What is the most appropriate step to
take? - ANSWER use a certified language line
,The intensity of the ultrasound beam is usually greater at the focal zone because
of - ANSWER smaller beam diameter
the operating frequency depends on the - ANSWER crystal thickness
the dynamic range of a system - ANSWER Ratio of smallest to largest power
level
What term describes a digital imaging system that enables ultrasound, x-ray, MRI,
and CT images to be stored electronically and viewed remotely on a workstation? -
ANSWER PACS
Which of the following best describes autocorrelation? - ANSWER A
mathematical process in which a waveform is multiplied by time-shift versions of
itself
The acoustic impedance of a material is - ANSWER equal to the product of
density and velocity
Ultrasound transducers convert - ANSWER mechanical to electrical
A long near zone can be obtained by - ANSWER using a higher frequency
transducer
What is the ratio of particle pressure to particle velocity at a given point within the
ultrasonic field? - ANSWER impedance
, The principle that states that all points on a wavefront can be considered as point
sources for the production of spherical secondary wavelets was postulated by -
ANSWER huygens
Which of the following types of scan converter is used in current ultrasound
systems? - ANSWER digital
Which of the following is a system performance parameter that is assessed using a
multipurpose phantom to determine the minimum echo amplitude that can be
detected? - ANSWER sensitivity
The major factor in determining the acoustic power output of the transducer is
the - ANSWER magnitude of the pulser voltage spike
The extraneous beams of ultrasound not in the direction of the main axis specific
to multielement transducer arrays are called - ANSWER Grating lobes result
from multielement structures of transducer arrays. Side lobes are similar to
grating lobes but are created by mechanical or single element transducers.
The refractive index of water is slightly altered when a sound beam passes
through it, thus causing compression and rarefaction of the water molecules.
The phenomenon is the basis for what technique used to make ultrasound beam
measurements? - ANSWER Schlieren photography
artifact deeper than it actually is - ANSWER propagation speed error
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