Brain imaging
Published on Nov 22, 2015
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PRESENTATION OUTLINE
Learning objectives
- Know different methods of brain scanning
- Describe these methods
- Explain advantages and disadvantages of each
Photo by cogdogblog
Three types of brain imaging
- Computerised Tomography (CT)
- Magnetic Resonance Imaging (MRI)
- Functional Magnetic Resonance Imaging (fMRI)
Photo by ajari
Computerised Tomography
Use radiation (x-rays) to produce cross-section images of the brain.
Dense structures in the brain absorb more radiation than less dense structures so show up as a lighter colour. It only shows structures and will show up tumours. it will not show function. Disadvantage is that the patient is exposed to radiation - carcinogenic
Magnetic Resonance Imaging
Use a really strong magnetic field and radio waves
Again produces a cross - section . Provides a detailed picture of the brain structure by measuring the density and location of brain material. Disadvantage - patient has to lie still for a long time
Photo by Muffet
Functional MRI
Like MRI scans but they show changes in brain activity
links brain structure to brain activity using the flow of oxygenated blood. A patient may be asked to respond to stimuli during the proceedure
Photo by mhuang
Learning objectives
- Know different methods of brain scanning
- Describe these methods
- Explain advantages and disadvantages of each
Photo by cogdogblog
