**7. Ultrafast Doppler ultrasound**

There is an increasing interest in studying the function of human brain using neuro-imaging techniques [18]. In particular, ultrasonic waves which are transmitted at extremely high or ultrafast frame rates, have shown promise in detecting blood flow signals in very small vessels such as those that perfuse the brain [18]. This has been experimented in rodents with advantages of high spatial and temporal resolution, improved penetration and ability to detect microvascular changes associated with brain functions [18].

The advantages are further enhanced due to its portability and possibility of bedside use. Over the past one decade, bold attempts at applying the technique in preclinical imaging, creates room for wider possibilities in neonates, during operative surgery, or better still, the development of non-invasive brain machine interfaces [19]. The clinical application of this technique opens a new vista in the understanding of brain hemodynamics, changes following brain insult, and options for preserving neurological function [18, 19].
