ARDMS SPI Exams Questions and Answers Certified Solutions 100 Correct Answers Verified A Graded
ARDMS SPI Exams Study Solutions | A+ Rated Study Resource Example of nonspecular reflector - answer - red blood cells What happens to spatial pulse length when frequency increases? - answer - decreases Axial resolution is dependent on? - answer - Spatial Pulse Length Lateral resolution is dependent on? - answer - beam diameter Where does the beam of an unfocused transducer diverge? - answer - in the far field (Fraunhofer zone) Reverberation artifacts are a result of - answer - two or more strong reflecting surfaces True/False: Grating lobes are essential for the proper operation of a linear phased array. - answer - False grating loves are NOT essential. They are an UNDESIRABLE artifact True/False: Electronically steered scanners always produce higher resolution images than do mechanically steered scanners. - answer - False resolution depends on beam width, focusing, aperture, and frequency, not steering method. Electronic steering can introduce artifacts that reduce resolution. True/False: An annular array scanner uses mechanical beam steering. - answer - True True/False: A linear sequenced array cannot be dynamically focused. - answer - False linear sequenced arrays are electronically focused and steered registration or B-mode alignment - answer - Which AIUM test object function utilizes all the groups of wires in the AIUM 100 mm test object? axial resolution - answer - Which AIUM test object function utilizes the A group of wires in the AIUM 100 mm test object? lateral resolution - answer - Which AIUM test object function utilizes the B group of wires in the AIUM 100 mm test object? dead zone - answer - Which AIUM test object function utilizes the D group of wires in the AIUM 100 mm test object? depth calibration - answer - Which AIUM test object function utilizes the C or E groups of wires in the AIUM 100 mm test object? What happens to axial resolution when spatial pulse length is decreased? - answer - improves How much will a 3.5 MHz pulse be attenuated after passing through 2 cm of soft tissue? - answer - 3.5 dB Propagation speed errors result in - answer - improper axial position Enhancement is caused by - answer - weakly attenuating structures The Doppler shift frequency is - answer - directly proportional to the velocity of the reflector The number of frames per second necessary for a real-time image to be flicker free is - answer - more than 15 True/False: The SPTA intensity will always be larger than the SATA intensity. - answer - True The intensity of the ultrasound beam is usually greater at the focal zone because of - answer - the smaller beam diameter If the amplitude is doubled, the intensity is - answer - quadrupled The attenuation for soft tissue is - answer - increased with tissue thickness The acoustic impedance of the matching layer - answer - can be chosen to improve transmission into the body True/False: In a pulse-echo system, the quality factor should be made as large as possible. - answer - False True/False: The beam diameter is constant in the near zone. - answer - False The operating frequency is dependent on - answer - thickness of the crystal The period of an ultrasound wave is - answer - the time of one cycle The dynamic range of a system is - answer - the ratio of smallest to largest power level that the system can handle True/False: The intensity of an ultrasonic beam can be measured with radiation force balance. - answer - True Increasing the pulse repetition period - answer - increases the maximum depth that can be imaged Ultrasound bioeffects - answer - are not confirmed below 100 mW/cm² SPTA True/False: No refraction can occur at an interface if the media impedances are equal. - answer - False True/False: Smaller transducers always produce smaller beam diameters. - answer - False True/False: The ultrasound beam profile can be measured with a hydrophone. - answer - True True/False: The pulsed-Doppler system yields better depth resolution than th
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