#7.4 CT/PET/MRI/fMRI

computerized tomography (CT)

gives structural image through computer-assisted x-ray procedure

computerized tomography (CT)

used to visualize brain and other internal structures of the body

computerized tomography (CT)

helps detect tumors or other structural abnormality

computerized tomography (CT)

xray beams through object

molecules absorb same radiation

no absorption is reflected

photographic plate

plate created by CT that shows structures (e.g. bones) diff from surroundings

positron emission tomography (PET)

gives functional images of the brain with the detection (concentrations) of glucose (i.e. FDG)

positron emission tomography (PET)

higher activity = higher glucose

red-yellow = high activity

green-blue = low activity

fluorodeoxyglucose (FDG)

glucose that can't be metabolized = accumulates around active neurons until it's gradually broken down

magnetic resonance imaging (MRI)

gives structural image through magnetic field

magnetic resonance imaging (MRI)

makes 3D computerized image from reading the magnetic field

better than CT

magnetic resonance imaging (MRI)

reads magnetic field created by re-aligned hydrogen atoms (re-alignment caused by a magnetic field)

functional images

images that show brain activity

functional magnetic resonance imaging (fMRI)

MRI that produces functional images bc its good in localizing activity

functional magnetic resonance imaging (fMRI)

modified MRI by detecting the decreased amount of hemoglobin with oxygen due to brain usage

functional magnetic resonance imaging (fMRI)

better than PET

- no injection

- both structural & functional in 1 image

- better spatial resolution

- produce 3D images of entire brain's activity

functional magnetic resonance imaging (fMRI)

more blood flow fr brain activity = brain uses oxygen = hemoglobin w/ oxygen lowers bc of usage