ABSTRACT
Brain injury, brain tumors, stroke, dementia and epilepsy severely affected people’s lives. Existing clinical brain imaging techniques contained X-ray computed tomography, magneticresonance imaging (MRI), ultrasonography and positron emission tomography (PET) (Elwell & Beard, 2005) can provide structure or functional information of the brain, and however, they all have limitations. X-ray computed tomography is expensive and moreover it uses ionizing radiation. MRI requires high cost of maintenance and demands a strong magnetic field (Wang, 2008). Ultrasonography has strong attenuation due to echo reflection of skull. PET injects radioactive substance into the human body, which will lead to irreversible damage to the body.Thus, it’s urgent to develop a novel, noninvasive and high-resolution imaging technology for brain imaging.
