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Question 20: Ultrasound SafetyWhich of the following statements about ultrasound safety is correct?%u2022Ultrasound uses ionizing radiation%u2022There are no known risks associated with diagnostic ultrasound%u2022Ultrasound can cause tissue heating%u2022Ultrasound should be avoided in pregnancy%u2022Ultrasound contrast agents are radioactiveAnswer: Ultrasound can cause tissue heatingExplanation: While ultrasound is generally considered safe, it can cause tissue heating and cavitation. These effects are minimal in diagnostic ultrasound, but the principle of ALARA (As Low As Reasonably Achievable) should be followed. Ultrasound does not use ionizing radiation and is safe in pregnancy.