URR mock exam 1 SPI Verified Answers

URR mock exam 1 SPI Verified Answers ____ is defined as specific area or location where Doppler shift info is being obtained. A. spectral broadening B. nyquist limit C. sample volume D. spectral window C. sample volume Spatial resolution is: A. the minimum reflector separation required to produce separate echos. B. highest with linear phased arrays. C. the weakest reflected signal the transducer can receive D. another term for slice thickness resolution A. the minumum reflector separation required to produce echos Which of the following Doppler angles would lead to the most significant error in estimation of the flow velocity? A. 25 B. 45 C. 65 D. 80 D. 80 which of the following necessary machine setting with performing a contrast evolution of the heart? A. harmonic imaging off B. mechincal index set to 0.3 or lower C. mechanical index set to 1.0 or greater D. Low PRF color Doppler setting B. mechanical index set to 0.3 or lower How many pulses are needed per scan line in order to generate a single frame of color Doppler? A. 6 B. 1 C. 16 D. 3 D. 3 The rectus abdominis muscles are associated with ____, while the diaphragm is associated with ______. A. shadowing, enhancement B. comet tail, ring down C. refractive shadowing, lobe artifact D. refraction artifact, mirror image artifact D. refraction artifact, mirror image artifact When evaluating a suspected arterial stenosis, a doppler angel of ____ degrees will produce the most accurate flow velocity. A. 0 B. 30 C. 60 D. 90 A. 0 Increasing the angle of electronic steering causes _____ production of lobe artifact. A. increased B. decreased C. no change D. limited A. increased Put the following media in order from lowest to highest according to their acoustic impedance: Bone Air Liver Blood Air, blood, liver, bone Even and odd harmonic frequencies are created by: A. alternating current to different piezoelectric elements in the transducer array B. non-linear sound wave propagation C. variable timing of the firing of the piezoelectric elements D. turbulent flow in the blood vessel B. non-linear sound wave propagation what type of transducer array has the fewest numbers of elements? A. linear phased array B. annular array C. curvilinear sequential array D. mechanical transducer B. annular array ______ artifact is caused by refraction and results in subtle image degradation. A. comet tail B. scatter C. misregistration D. multipath D. multipath Which of the following will improve lateral resolution at all depths on the image? A. dynamic transmit focusing B. dynamic receive focusing C. decrease probe frequency D. use 3 focal zones B. dynamic receive focusing which of the following units is used to describe beam intensity? A. dB/cm/MHz B. dB C. mW/cm 2 D. mW C. mW/cm 2 which of the following parameters cannot be evaluated by the AIUM test object? A. depth calibration B. distance calibration C. gray scale D. azimuthal resolution C. gray scale ultrasound hybrid imaging refers to : A. using 2D ultrasound imaging with microbubble contrast B. automated ultrasound imaging C. fusion of real time ultrasound imaging with another modality to form a new evaluation technique D. comparing ultrasound images to a CT exam on a PACS system C. fusion of real time ultrasound imaging with another modality to form a new evaluation technique which of the following system adjustments would increase the size of the spectral window? A. decreasing rejection B. changing from a 2mm to 4mm sample size C. changing from a 4mm to 2mm sample size D. tortuous vessel C. changing from a 4mm to 2mm sample size In read magnification, image size and _____ increases. In write magnification, image size and ____ increases. A. pixel size, number of pixels B. number of pixels, pixel size C. reflection amplitude, transmitted amplitude D. frame rate, time of frame production A. pixel size, number of pixels