2Scroll Compressor History and Development 2OPERATING PRINCIPLES................................ 3Geometry of a Scroll....................................... 3The Scroll Set ................................................. 3Compression Process ...................................... 4Compliance .....................................................
A: Your baby's heartbeat is one of the first things your doctor will look for on an ultrasound, a test that uses sound waves to give off visual images of your baby and placenta as well as your uterus and other pelvic organs.
1 This ultrasound can routinely detect a heartbeat in your baby as early as 6-7 weeks. 2  Confirming the correct dates of your pregnancy. 3  Some women are uncertain of their last menstrual period (LMP) or have irregular menstrual cycles, making it difficult for their doctor to correctly estimate when the baby is due.