In general, no.
When dig it deeper, yes.
The B mode part of B超 is believed to be safe. However, for every OB ultrasound, you need M mode to detect/document fetal hear beat. M mode US beam focused on small tissue can elevate tissue temperature, among others. So LONG period M mode on fetal heart should be avoided --- don't be too excited of asking the sonographer to let you listening to your baby's heart beat !!!
Good luck.
When dig it deeper, yes.
The B mode part of B超 is believed to be safe. However, for every OB ultrasound, you need M mode to detect/document fetal hear beat. M mode US beam focused on small tissue can elevate tissue temperature, among others. So LONG period M mode on fetal heart should be avoided --- don't be too excited of asking the sonographer to let you listening to your baby's heart beat !!!
Good luck.
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