Dale Purves' et al: Neuroscience 6th Edition

Computerised Tomography (CT) - A narrow X-ray beam, with the help of rotating (adjustable) detectors, collect radio density information from every orientation around a narrow slice. This allows the software to create a tomographic image by calculating the radio density of each point. The following preliminary research is taken from: "Wikipedia: X-ray tube." This beam was delivered by Crookes' Tubes. These generated the electrons required to emit X-rays by ionising the residual air within a glass chamber partially evacuated of matter. The aforementioned glass bulbs contained atmospheric pressures that varied from 0.005 to 0.1 Pa. The X-ray waves emitted by the cathode were guided by its complementary, particleabsorbing anode placed at a particular angle. The aluminium cathode was concave. The resulting point source of localised X-ray beams gave sharper images. The 3D radio-density matrices that evolved gave an image with anatomical resolution in the millimetre range. Diffusion Tensor Imaging (DTI) - By aligning the radio frequency to the magnetic fields of water molecules in axon tracts, DTI can visualise and establish axon pathway connectivity and the neuro-vascular system. Event Related Potential Analysis (ERP) - EEG electrodes are placed in an ordered spatial array across the scalp. The electrical activity from each point in the electrode array is detected, amplified and subsequently mapped with reference to each others' positions