Regarding the recommendations of the British Medical Ultrasound Societ

1.	Regarding the recommendations of the British Medical Ultrasound Society for obstetric and neonatal ultrasound: a. In obstetric scanning up to 10 weeks after the last menstrual period, the operator should monitor the thermal index for bone (TIB) b. There are no time restrictions on scanning with a thermal index (TI) <1.0 c. Scanning of the embryo or fetus is not recommended, however briefly, with a TI >3.0 d. General neonatal scanning is not recommended, however briefly, with a TI >3.0 e. In neonates, the possibility of lung or intestine damage occurs with a mechanical index (MI) >0.7
Answer» a. False. The thermal index for soft tissue (TIS) should be monitored. The TIS assumes that only soft tissue is insonated. At 10 weeks after the last menstrual period, ossification of the fetal spine starts and the TIB should be monitored. b. False. Scanning with a TI between 0.7 and 1.0 is restricted to 60 min. There are no time restrictions for a TI <0.7. c. True. d. False. Scanning of the central nervous system (transcranial or spinal ultrasound) is not recommended with a TI >3.0. In this case, the thermal index for cranial imaging (TIC) should be monitored. General neonatal scanning is not recommended with a TI >6.0. Note that, although allowed, scanning with a TI just below these values is unlikely to be of clinical use due to the time restrictions (e.g. general scanning with a TI between 4 and 5 is allowed for 15 s, and with a TI between 5 and 6 for 5 s only). e. False. This possibility exists with an MI >0.3.

Regarding the recommendations of the British Medical Ultrasound Society for obstetric and neonatal ultrasound: a. In obstetric scanning up to 10 weeks after the last menstrual period, the operator should monitor the thermal index for bone (TIB) b. There are no time restrictions on scanning with a thermal index (TI) <1.0 c. Scanning of the embryo or fetus is not recommended, however briefly, with a TI >3.0 d. General neonatal scanning is not recommended, however briefly, with a TI >3.0 e. In neonates, the possibility of lung or intestine damage occurs with a mechanical index (MI) >0.7

Answer»

a. False. The thermal index for soft tissue (TIS) should be monitored. The TIS assumes that only soft tissue is insonated. At 10 weeks after the last menstrual period, ossification of the fetal spine starts and the TIB should be monitored.

b. False. Scanning with a TI between 0.7 and 1.0 is restricted to 60 min. There are no time restrictions for a TI <0.7.

c. True.

d. False. Scanning of the central nervous system (transcranial or spinal ultrasound) is not recommended with a TI >3.0. In this case, the thermal index for cranial imaging (TIC) should be monitored. General neonatal scanning is not recommended with a TI >6.0. Note that, although allowed, scanning with a TI just below these values is unlikely to be of clinical use due to the time restrictions (e.g. general scanning with a TI between 4 and 5 is allowed for 15 s, and with a TI between 5 and 6 for 5 s only).

e. False. This possibility exists with an MI >0.3.

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