Concerning the thermal effects of ultrasound: a. Potential sources of

1.	Concerning the thermal effects of ultrasound: a. Potential sources of heating are the absorption of ultrasound waves and heat produced at the transducer surface b. A temperature rise of less than 1°C is considered to present no hazard to human tissue including the embryo and fetus, even if maintained indefinitely c. According to International Standards IEC (2007), the maximum temperature of the probe in contact with the patient should not exceed 43°C when used internally, or 50°C when used externally d. Doppler techniques pose greater heating risks when compared with B-mode imaging e. Spectral Doppler poses less heating risk compared with colour flow imaging
Answer» a. True. b. False. According to the British Medical Ultrasound Society, a diagnostic exposure that produces a maximum temperature rise of no more than 1.5°C above normal physiological levels (37°C) may be used clinically without reservation on thermal grounds. c. False. The temperature of a probe touching the patient either externally or internally should be limited to 43°C. The 50°C temperature limit applies to a probe running in air. d. True. Doppler imaging involves greater ultrasound intensities. e. False. There is a higher risk of heating in spectral Doppler as the beam is held in a fixed position.

Concerning the thermal effects of ultrasound: a. Potential sources of heating are the absorption of ultrasound waves and heat produced at the transducer surface b. A temperature rise of less than 1°C is considered to present no hazard to human tissue including the embryo and fetus, even if maintained indefinitely c. According to International Standards IEC (2007), the maximum temperature of the probe in contact with the patient should not exceed 43°C when used internally, or 50°C when used externally d. Doppler techniques pose greater heating risks when compared with B-mode imaging e. Spectral Doppler poses less heating risk compared with colour flow imaging

Answer»

a. True.

b. False. According to the British Medical Ultrasound Society, a diagnostic exposure that produces a maximum temperature rise of no more than 1.5°C above normal physiological levels (37°C) may be used clinically without reservation on thermal grounds.

c. False. The temperature of a probe touching the patient either externally or internally should be limited to 43°C. The 50°C temperature limit applies to a probe running in air.

d. True. Doppler imaging involves greater ultrasound intensities.

e. False. There is a higher risk of heating in spectral Doppler as the beam is held in a fixed position.

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