<unk>  is a very safe technique as it is non-invasive and does not involve any kind of ionising radiation. However, it is subject to certain limitations. * Operator dependency: the quality of images obtained relies on the skill of the person performing sonography. * Some brain structures are poorly visualised, notably posterior fossa structures such as the cerebellum if only the anterior fontanelle is used. * If the fontanelle is very small, for example is post-mature infants, scanning may be technically difficult. * Damage to the brain soft tissue (parenchyma), for example resulting from ischaemia or abnormal myelination, may be hard to see. Therefore many neonatal services prefer to perform an MRI scan when the infant is near term, as well as routine<unk> , to avoid missing more subtle abnormalities.
Cranial ultrasound
Brain biopsy
Transcranial pulsed ultrasound
Magnetic resonance imaging of the brain
Hemoencephalography
Audiometry
Cranio-corpography
Magnetoencephalography