SPI Practice Test Already Graded A+

SPI Practice Test Already Graded A+ M mode ️which mode has time on one axis and depth on another? preprocessing ️write zoom is considered: improve, decrease ️increasing the color Doppler line density will _____ color Doppler resolution but will ______ the frame rate enhancement ️the increase in the amplitude and intensity of returning echoes due to low attenuation structures: memory ️preprocessing occurs before: refraction ️which of the following does not occur with normal incidence? temporal ️which resolution has the ability to accurately depict moving structures? HIGH VELOCITIES and acute anemia ️turbulent flow is most likely to occur in which one of the following situations? shift ️the difference between the transmitted frequency and the received frequency is known as the Doppler: persistance ️what averages signals to reduce noise but results in poor temporal resolution? acoustic energy ️a hydrophone is used to measure diffuse ️what type of reflector is large and jagged in comparison to the wavelength? refraction ️the artifact associated with a change in the direction of the beam as it crosses an interface: fixed focus ️mechanical transducers have: 0 m/sec ️if a transducer moves toward a target at 1 m/sec and a target moves away from the transducer at 1 m/sec, the velocity registered by the Doppler effect would be: attenuation ️the loss of sound intensity and amplitude is called: electronically ️the sector phased array is primarily focused: shift ️an increase in the Doppler transmit frequency will result in an increase in the Doppler: decreases ️as image depth increases, PRF: electronically focus in 2 dimensions ️annular phased arrays, unlike linear phased arrays: 6mm ️a continuous wave unfocused transducer is 12 mm. the sound beam width at one near zone length is: different propagation speeds ️when a sound wave strikes a tissue interface at an oblique angle of incidence, what other condition must be present for refraction to occur? transducer diameter ️which of the following has the greatest effect on the near zone length? slice thickness ️the artifact where a fluid filled cyst may be filled in with debris area ️pressure is force per unit: propagation speed ️which of the following is not an acoustic variable? matrix ️what type of transducer arranges the piezoelectric elements in rows and columns: higher frequencies ️for pulsed wave transducers, thin elements produce: display format ️which of the following factors does NOT affect spatial resolution in the displayed image? decrease image depth ️which of the following increases frame rate? period ️all of the following will effect propagation speed except: biological ️the effects of ultrasound on living tissue is called: shift ️a change in the frequency of sound relative to the motion of the source and/or the observer is known as the Doppler: 1540 m/s ️the propagation speed of the AIUM 100 test object is? mean velocities ️color Doppler provides piezoelectric effect ️which piezoelectric effect does the transducer utilize on RECEPTION? stiffer than soft tissue ️if the propagation velocity in a medium is 3000 m/sec, the medium is probably: yes ️the Doppler shift is 5,000 Hz. The PRF is 9,000 Hz. will aliasing occur? refraction, reflection ️there is normal incidence. the acoustic impedance in medium 1 is 1.3 Megarayls, and the acoustic impedance in medium 2 is 1.3 Megarayls. there will be no: 1% ️how much energy will be reflected at a fat-muscle interface? % attenuation coefficient ️the amount of attenuation per centimeter is called: 99% ️how much energy will be reflected at a soft tissue-air interface? % 1% ️the percentage of time spent transmitting in clinical imaging is approximately: higher ️switching to a higher frequency transducer to quantify a regurgitant jet or stenotic flow will result in a _________ Doppler frequency shift 2mil Hz to 12 MHz ️the frequencies generally used for diagnostic ultrasound are: stiffness ️the propagation speed is directly related to the mediums: dynamic range ️the ratio of the largest power to the smallest power that the ultrasound system can handle is the decrease ️what effect will an increase in mediums elasticity have on the speed of sound? .5-.08 MICROseconds ️the range of periods used for diagnostic ultrasound is: 15400cm ️all of the following may be used to express the speed of sound in soft tissue except: postprocessing ️read magnification is performed during: frequency ️to increase the depth of penetration the sonographer should decrease: PRF ️the number of ultrasound pulses emitted per second is: -3dB ️if the power is decreased by a factor of two and all beam dimensions remain the same, the