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 imagin...
SPI practice exam questions and
answers 2024
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
SPI practice exam questions
, SPI practice exam questions
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
the optimum operating frequency for a broad bandwidth transducer is -answer- ✔10
which of the following is not significantly affected by the limited field of view when
imaging superficial structures like the breasts -answer- ✔temporal res
the dynamic range of the display is teh -answer- ✔output power
amplitude of the transmitted voltag -answer- ✔output power
SPI practice exam questions
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