Practice Exam SPI All Answers Correct

Practice Exam SPI All Answers Correct Continous Wave transducer structure and function CW probes usually have no backing material Duty Factor of 100% Console Adjustment that will improve the temporal resolution on the image decreasing depth 7 Best UK Staycations for Your Next Caravan Holiday The rectus abdominis muscles are associated with_____________________, while the diaphragm is associated with__________________ refraction artifact, mirror image artifact You are scanning a Thyroid gland with a 5 cm wide linear array transducer. You are unable to document the upper and lower poles in the same image to obtain a length measurement of the gland. Which of the following techniques should assist in documenting the entire thyroid gland on a single image? panoramic imaging trapezoidal feild of view dual screen function IF a Doppler system is operating at a PRF of 5,000/s what is the maximum Doppler frequency that can be detected? 2.5kHz or 2500Hz because Nyquist Limit=1/2 x PRF If an ultrasound beam passes from soft tissue through a large fatty mass and then back into soft tissue, what will be displayed on the image Echoes from tissues posterior to the mass will be placed deeper on the image soft tissue speed is slower than soft tissue The wider the element diameter, the lower the beam intensity (I=P/A) ____________can be used to reduce image noise and clutter on the 2D image Spatial Compounding SonoCT beam steering, averaging, reduction of speckle, clutter, and imaging artifacts Which of the following will increase the duty factor of the pulsed ultrasound probe? decreasing the image depth increases PRF machine spends more time emitting pulses As beam width increases, how is intensity affected decreases A 5MHz transducer has a PRF of 6kHz and is being used to produce a wace with a 0.6mm wavelength and a 3mm spatial pulse length. What is the axial resolution of this system? 1.5 RESax= SPL/2 If you use a tissue phantom that contains a substance with an average propagation speed of 1600cm/s to calculate a standard ultrasound system, how will this affect the depth calibration testing reflectors will appear more shallow than they actually are located within the phantom tissue-equivalent phantoms=1540 m/s prop speed How can you adjust the elevation focus to a more superficial location in a 1D array transducer use a stand off pad focus 1m closer 1D array transducers set by an acoustic lens The average attenuation of ultrasound in soft tissue is 0.5 db/cm/MHz Which of the following is necessary for a multi hertz transducer broad bandwidth Xdcr can operate at 2 or more different ceneter frequencies Blood is flowing toward a 7MHz transducer; you expect the reflected frequency to be ________7MHz. greater than (positive) Which of the following is a limitation of Analog Doppler unable to detect post stenotic turbulence and spectral broadening underestimates high velocities overestimates low velocities cannot detect flow less than 6 m/s Increasing the angle of electronic steering causes___________production of lobe artifact. increased steering causes diffraction of the beam to occur/lobe artifacts errors in position of returning echo When a patient is supine, what is the hydrostatic pressure at the ankles? 0mmHg at the level of the heart Important to know for ABI According to the attached color map, what color will the blood be demonstrated that is moving away from the probe at 30 cm/s and is highly turbulent Green green and yellow indicate turbulence What happens to the attenuation coefficient as the wave travels through soft tissue remains constant it will remain constant until it travels through a diff medium Which of the following system functions allows the linear transducer to offer a trapezoidal field of view Electronic Steering beam can be steered outward laterally The best angle of insonation to produce the most accurate Doppler shift information is _________degrees. 0 best obtainable angle of insonation is 60 degrees. Which of the following describes an important reason to verify the US examination that is ordered is the exam that should really be performed When the suspected diagnosis is not able to be evaluated by the exam that is ordered Which of the following correctly describes the color displayed on the image? The heel-to-toe method can be used to change the course of the vessel across the image and this will allow the vessel to accurately display a single color The main advantage of a curvilinear transducer over a vector transducer is the wider near field Which of the following fetal structures carries the greatest risk of thermal injury from ultrasoun