ARDMS SPI Practice Exam B.docx

Which artifact is illustrated by this image? - correct answer a) Shadowing b) Side Lobe c) Reverberation d) Mirroring What is increased if the pulse duration is decreased? - correct answer a) Bandwidth b) Line Density c) Frame Rate d) Duty Factor What is the most appropriate action for the sonographer to take when receiving a verbal order for an exam? - correct answer a) Deny performance of the exam until a written request is received b) Seek approval from supervisor c) Verbally repeat the request back to the referrer to verify correctness d) Document two forms of ID of the patient What is the round trip time in soft tissue for an echo from a reflector at a depth of 1 cm - correct answer a) 1.54 usec b) 6.5 usec c)13 usec d) 26 usec What adjustment should be made to avoid the aliasing displayed on this spectral doppler image seen on spectral analysis? - correct answer a) Reposition sample volume so it is deeper. b) Decrease acoustic power c) Change the doppler angle from 60 to 45 degrees d) Decrease the transducer freq In an unfocused transducer, what is the region between the transducer face and the point where the beam diverges? - correct answer a) Side lobe b) Focal Zone c) Near field d) Far field What caused the color pattern demonstrated in the artery indicated by the arrow in this image? - correct answer a) Superimposed venous flow b) Aliasing c) Flow reversal d) Color side lobe artifact What technique increases the sharpness of high contrast boundaries? - correct answer a) Edge enhancement b) Interpolation c) Smoothing d) Frame averaging Which setting of an ultrasound system gives the sonographer the ability to display both strong and weak echoes? - correct answer a) Dynamic range b) Resolution c) Range calibration d) Sensitivity Which condition must be present for refraction to occur? - correct answer a) Presence of a strong specular reflector b) Presence of several small reflectors c) Difference in tissue prop speeds d) A change in the angle of reflection In this image, most of the blood flow is in which direction? - correct answer a) Right to left b) Left to right c) Bidirectional d) Indetermiate If red blood cells are approaching a 5 MHz doppler transducer at a sppeed of 75 cm/s, what is the appropriate received ultrasound frequency? - correct answer a) 4,500 kHz b) 4,995 kHz c) 5,005 kHz d) 5,500 kHz What is the most common cause of localized vertical nonuniformity in a real-time B-mode image? - correct answer a) Improper TGC b) Defective transducer elements c) Faulty preamplifier d) Malfunctioning scan converter The thermal index (TI) is most affected by which type of interaction between sound and tissue? - correct answer a) Reflection b) Absorption c) Scattering d) Refraction Which artifact is commonly seen with cystic masses due to the finite dimensions of the ultrasound beam? - correct answer a) Duplication b) Mirror Image c) Reverberation d) Slice thickness Which imaging mode requires two elements mounted side by side? - correct answer a) Real-time imaging b) Duplex imaging c) PW ultrasound d) CW doppler What is the nyquist limit if a PW doppler instrument has a PRF of 16 kHz? - correct answer a) 32 kHz b) 10 kHz c) 8 kHz d) 5 kHz WHich variable decreases when the number of acoustic lines per frame is increased without changing the maximum depth? - correct answer a) SPL b) Frame rate c) PRF d) Receiver dynamic range When the focal point in a B mode image is electronically changed, which type of focusing is in use? - correct answer a) Lens b) Mechanical c) Dynamic d) Curved crystal What is a benefit of using contrast agents? - correct answer a) Output power can be increased after contrast administration to improve visualization b) Increased amplitude of the returning doppler signals c) Harmonic signals produced by contrast agents are weaker than those produced by tissue d) Frame rate is improved when interrogating contrast with power doppler Frequency compounding improves image quality by doing what? - correct answer a) Increasing frame rate b) Improving dynamic range c) Reducing speckle d) Reducing grading lobes Which scenario will produce no doppler shift to the receiver? - correct answer a) Source and receiver moving at the same speed and direction b) Source moving toward the receiver c) Source moving away from receiver d) Receiver moving toward source A sound wave propagates fastest through which substance? - correct answer a) Bone b) Muscle c) Fat d) Gas What determines the center freq of a transducer? - correct answer a) Diameter