Techniques of Scanning

Question 1

Divisions

Answer 1

Invasive and non invasive

Question 2

Computerised Axial Tomography (CAT)

Answer 2

Noninvasive technique for examining brain structure in human through computer analysis of xray absorption at several positions around the head

• useful for visualising strokes, tumours or cortical atrophy
• high spatial resolution, mediocre temporal resolution

Question 3

Positron Emission Tomography

Answer 3

Examination of brain function by combining tomography with injections of radioactive substances used by the brain. Provides information about bloodflow and use of oxygen and sugar. Unsed for Alzheimers, Parkinsons, seizures, strokes and tumours
High spatial resolution, low temporal.

Question 4

Transcranial Magnetic Stimulation

Answer 4

Stimulation of an area of the cortex through application of strong magnetic fields . (to treat depression ) Low spatial resolution and middle temporal resolution

Question 5

Magnetencephalography

Answer 5

non invasive, measures tiny magnet fields produced by active neurons to identify active regions. Excellent temporal resolution, lack in spatial resolution

Question 6

Magnetic Resonance Imaging (MRI)

Answer 6

Noninvasive technique that uses magnetic energy to generate high resolution images for structural details.
High spatial resolution, no temporal resolution

Question 7

Diffusion tensor imaging (DTI)

Answer 7

Uses movement/diffusion of water molecules to show orientation and location
allows the mapping of the diffusion process of molecules, mainly water, in biological tissue, in vivo and non-invasively

Question 8

Functional Magnetic Resonance Imaging (fMRI)

Answer 8

Measures oxygenation of blood in the brain
Non invasive
High spatial resolution
Low temporal resolution

Question 9

Electroencephalography (EEG)

Answer 9

Measures all electrical activity of the brain.
Used a lot for sleep research or brain surgery
low spatial resolution