Is a technique for scanning the brain and cerebrospinal fluid using high-frequency sound waves. It is used almost exclusively in babies because their fontanelle (the soft spot on the skull) provides an "acoustic window".
You don't need to do anything special to prepare for this test.
If an older baby is having the test, it may help if the baby is a little hungry. You can feed your baby during the test. This may help calm your baby so he or she will hold still during the test.
This test is done by a doctor who is an expert in imaging tests (radiologist). Or it may be done by an ultrasound technologist (sonographer) who works along with a radiologist. For a baby, the test may be done at the baby's bedside in the neonatal intensive care unit (NICU).
Your baby will lie on his or her back. The transducer is moved across the soft spot on top of the head. This spot is called the fontanelle. You may be asked to hold your baby during the test. Pictures of the brain and inner fluid chambers (ventricles) can be seen on a video screen.
For an adult, the test is done during brain surgery to help find a brain mass.
There are no contraindications to neurosonography.