The color assigned to flow towards the transducer is:
Definition
red
Term
The type of processing utilized with most color flow systems is:
Definition
autocorrection
Term
On color flow imaging, the best way to overcome aliasing is:
Definition
Term
The color priority on color flow instruments is used to:
Definition
Term
The color map represent the:
Definition
mean Doppler shifts only
Term
Aliasing is found in all of the following imaging modes except:
Definition
CW doppler
Term
PWD instruments are characterized because of their ability to do all of the following except:
Definition
no alaising or velocity limits
Term
The method used by CW Doppler to discriminate valuable signals is the
Definition
Term
In Doppler systems, changing the PRF is equal to changing the:
Definition
Term
An artifact that appears as multiple reflections equally spaced is called:
Definition
reverbaration
Term
Color mirror image artifacts can be eliminated by:
Definition
Term
Enchancement occurs when the sound beam travels through a region of ______ than the surrounding tissue.
Definition
Term
The type of test object that evaluates sample gate accurancy and registration is the
Definition
Term
Quality assurance test for evaluating the lateral resolution and beam width would ultilize the rods in Group
Definition
C
Term
The term used to describe a procedure or test determining that a person does not have disease is:
Definition
Term
The ALARA principle relates to:
Definition
Both minimum output and minimum exposure
Term
The method of identifying and measuring the parts of the ultrasound that have the potential for producing bioeffects is called:
Definition
dosimetry
Term
which statement about higher frequencies is most correct?
Definition
does not affect the propagation speed
Term
Transducer frequency is directly proportional to:
Definition
Term
As an ultrasound wave travels through the body, its intensity usually:
Definition
decreases
Term
which statement about higher frequencies is most correct?
Definition
Term
which condition between two media interfaces would produce the greatest amount of ultrasound reflected back to the transducer
Definition
large impedance difference
Term
Refraction often causes a type of artifact known as:
Definition
Term
The most effective crystal thickness is ____ the wavelength
Definition
Term
The optimal matching layer thickness is ____ the wavelength
Definition
Term
which statement about dicing & sub-dicing of the elements in a transducer is most correct:
Definition
A) B) C) D)
Term
The largest range of output intensities is seen with:
Definition
A) B) C) D)
Term
The echoes are stored before final display by the:
Definition
Term
Which result is most correct if the scan line density is halved:
Definition
Term
The number of pulses per second is referred to as:
Definition
Term
Line density for a given transducer is determined by:
Definition
A) B) C) D)
Term
The portion of the ultrasound system that stores the image before it is displayed is called:
Definition
Term
The advantages of a digital scan converter versus analog include all of the following except:
Definition
Term
What refresh rate do most high resolution monitors have?
Definition
60
Term
The difference between the transmit frequency and the received frequency is called the:
Definition
Doppler shift
Term
The angle corrector is used to:
Definition
Term
PWD instruments are characterized because of their ability to do all of the following except:
Definition
no alaising or velocity limits
Term
Multipath artifacts are caused by the sound beam interacting with a ______ surface
Definition
Term
The type of test object that evaluates sample gate accurancy and registration is the
Definition
Term
The AIUM has issued a statement saying no confirmed biological effects on patients of instruments operators have been reported at intensities below ______ mW/cm squared.
Definition
100
Term
Period and frequency are:
Definition
inversely
Term
The optimal matching layer thickness is ____ the wavelength
Definition
1/4
Term
Axial resolution is determined by:
Definition
spatial pulse length
Term
The tyoe of transducer that ulitizies concentric rings is called:
Definition
annular phased away
Term
The type of transducer that uses its geometric design to steer the elements and create a quasi sector shape image is called:
Definition
curved array
Term
Which of the following is NOT an advantage of harmonic imaging?
Definition
Term
Harmonics result from
Definition
non-linear tissue propagation of sound
Term
which statement about dicing & sub-dicing of the elements in a transducer is most correct
Definition
A) B) C) D)
Term
An eight bit deep imaging matriz would provide up to _____ shades of gray:
Definition
256
Term
What form are the signals as they leave the receiver
Definition
analog
Term
The advantages of a digital scan converter versus analog include all of the following except
Definition
signal integrity
Term
If the right artial pressure or central venous pressure is increased the veins in the body usually are
Definition
dilated
Term
The color priority on color flow instruments is used to:
Definition
Term
Color sensitivity is affected by of following factors except:
Definition
Term
Refraction causes lateral displacement of the reflector and is caused by _____ incidence
Definition
oblique
Term
Section thickness artifacts result from:
Definition
Term
Which one of the following is NOT a function of a test object:
Definition
beam profile
Term
The type of test object that contains gel with small spheres in random positions is the
Definition
Term
The formula for Positive predictive value (PV+) is:
Definition
Term
The beam profile is measured by what method?
Definition
accoustic optics
Term
which statement about higher frequencies is most correct?
Definition
does not affect the propagation speed
Term
Refraction often causes a type of artifact known as:
Definition
lateral position error
Term
In order for a refracted wave to be produced, which of the following conditions must be met at an interface?
Definition
oblique incidence, different sound speeds
Term
The resonant frequency of the tranducer is determined by the
Definition
crystal thickness
Term
Which is NOT considered a method of focusing
Definition
geometric design shpe
Term
The advantages of a digital scan converter versus analog include all of the following except:
Definition
Term
Advantages of laser imagers above multi-format cameras are all of the following except:
Definition
inexpensive
Term
The maximum amount of turbulence is usually detected
Definition
Term
The color priority on color flow instruments is used to:
Definition
Term
Radiation force measures which intensites?
Definition
Term
High receiver gains will increase the intensity of the sound.
