1. (a) Sketch the load characteristics, terminal voltage/load current, of the following types of DC generator: (i) series-connected, (ii) shunt-connected and (iii) compound-connected. (b) State one purpose for which….
The sonographer in this image is demonstrating which of the following?
1. When researching the biological effects of diagnostic ultrasound, which intensity is most commonly used?
2. Clinical trials are examples of which of the following?
a. in situ studies
b. in vivo studies
c. ex vivo studies
d. in vitro studies
3. Which intensity is the greatest during the pulse?
a. spatial peak
b. pulse average
c. temporal peak
d. spatial average
4. Pulse average is defined as the average intensity:
a. of the pulse
b. over the pulse area
c. throughout the duration of a pulse
d. across the entire sound beam
5. Cavitation is the interaction of the sound wave with:
a. living organisms
b. an acoustic reflector
c. gas bubbles in the aqueous gel
d. microscopic gas bubbles found in tissue
6. Which of the following organizations regulates ultrasound equipment?
7. The AIUM recommends:
a. ultrasound as a safe obstetrical procedure
b. decreased receiver gain and increasing acoustic power
c. prudent use of ultrasound in the clinical environment
d. obstetrical examinations for sex determination of a fetus
8. Cavitation is the result of:
a. a rise in tissue temperature exceeding 1° C
b. the attenuation of the sound wave as it travels through soft tissue
c. pressure changes in soft tissue causing the formation of gas bubbles
d. introduction of bubbles into the tissues and circulation from contrast agents
19. Absorption of the sound beam is highest in:
9. Heating of soft tissue is proportional to the:
a. tissue thickness
b. mechanical index
c. operating frequency
d. spatial peak intensity
10. The sonographer in this image is demonstrating which of the following?
a. twisting of the neck and reaching of the arm
b. abduction of the shoulder and twisting of the trunk
c. twisting of the trunk and reaching of the arm
d. reaching of the arm and abduction of the shoulder