SPI

1. Directly related means a. when one item increases or decreases, the second item responds the same direction b. when one item increases, the second item remains independent c. when one item increases, the change in the second item depends on additional factors 2. Two quantities are proportional if an increase in one quality leads to a/an _________ in the other. a. Increase b. Decrease c. increase in same ratio d. requires more than one factor for change 3. Proportionally related ...

13 microsecond rule CORRECT ANSWERS: the rule that states that it takes 13 microseconds for sound to travel 1 cm in soft tissue absorption CORRECT ANSWERS: the conversion of sound energy to heat acoustic cavitation CORRECT ANSWERS: the production of bubbles in a liquid medium acoustic speckle CORRECT ANSWERS: the interference pattern caused by scatterers that produces the granular appearance of tissue on a sonographic image AUIM test object CORRECT ANSWERS: an outdated test obje...

You have decreased the acoustic power by -3 dB. Which of the following most accurately describes this adjustment? A. Intensity has been quadrupled B. Intensity has been quartered C. Intensity has been increased 10 times D. Intensity has been halved E. Intensity has not been altered CORRECT ANSWERS: D. Intensity has been halved intensity change of 3 dB corresponds to a doubling of the intensity. if it's changed by -3 dB, intensity is halved. When you switch from a 2.5 MHz to a 5 MH...

What is a typical frame rate for B-mode real-time imaging? A. 1-9 kHz B. 10-50 Hz C. 100-200 MHz D. 200-300 Hz E. 0.05-0.9 Hz CORRECT ANSWERS: B. 10-50 Hz <Frame rates are displayed in terms of Hz, a unit of frequency equal to one cycle per second. Although frame rates vary, typical real-time frame rates range from 10 Hz to 50 Hz. If the frame rate is 30 Hz, that means 30 frames are produced in one second. Faster frame rates are found with cardiac imaging> What component is n...

What is frequency determined by? CORRECT ANSWERS: The source, thickness of piezoelectric element and propagation speed to a lesser degree Thicker element is equal to ________ frequencies CORRECT ANSWERS: Lower What is the reciprocal of frequency and what is the symbol CORRECT ANSWERS: Period, T The time it takes for 1 cycle to occur CORRECT ANSWERS: Period What is propagation speed determined by CORRECT ANSWERS: Stiffness and density of the medium Propagation speed of sound t...

The mass you are imaging has a diameter of 35MM. The value can also be expressed as: A. 350 cm B. 0.35 cm C. 3.5 cm D. 35 m E. 3.5 CORRECT ANSWERS: C. 3.5 cm Relative measurement based on a logarithmic scale is expressed in: A. Newtons per centimeter squared B. Watts per centimeter squared C. dB D. Pa C. Neper CORRECT ANSWERS: C. dB Which prefix equals 10^-3 A. Micro B. Milli C. Mega D. Centi E. None of the above CORRECT ANSWERS: B. Milli When you change the tran...

128-256 CORRECT ANSWERS: A cross-section image is made up of many scanlines. How many scanlines are there in one frame? Electromagnet wave CORRECT ANSWERS: Which type of wave is able to travel in both vacuum and different media Mechanical longitudinal wave CORRECT ANSWERS: Which type of wave is an ultrasound waves? Perpendicular CORRECT ANSWERS: In a mechanical transverse wave,, particles move____to the sound source Parallel CORRECT ANSWERS: Any mechanical longitudinal waves, pa...

No known effect CORRECT ANSWERS: The confirmed bio effects on pregnant women with use of real-time diagnostic instruments is: Low-frequency, high-intensity CORRECT ANSWERS: Which of the following combinations of frequency and intensity would most likely result in cavitation? Continuous wave CORRECT ANSWERS: Which of the following mold requires two crystals: one for transmitting and one for receiving? Bandwidth CORRECT ANSWERS: The range of frequencies contained in the Pulse ARE CALL...