MRI in ischemic stroke

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MRI in ischemic stroke에 관한 ppt자료입니다.

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Trembling in water
T1 Weighted Image
T2 Weighted Image
Signal Characteristics of MR
T2 signal
Reflects water content
Increases in most diseased state
Low signal suggests high cellularity
: Lymphoma or highly malignant tumor
Routine MR sequence
Diffusion weighted imaging
Ischemic stroke
ICH
Cases
Routine MR Sequence
Routine MR SequenceSpin Echo
choInversion Recovery
GRadiant And Spin Echo sequence
sequenceTurbo (or Fast) Spin Echo
choFLuid Attenuated Inversion Recovery
Routine MR sequence
Diffusion weighted imaging
Ischemic stroke
ICH
Cases
Basics of diffusion
Diffusion
Random motion of molecules
Diffusion coefficient (D)
Average distance that molecules move per unit time
Water proton
Diffusion of water molecules (In brain)
Slower than in pure water
Cellular membrane, fiber tracts
intracellular
Apparent diffusion coefficient (ADC)
Measured in biological tissue
During cerebral ischemia
Water proton mobility ↓(ADC ↓)
Within a few minutes
“Energy failure/anoxic depolarization”
Diffusion-weighted imaging
DWI is a very fast and robust technique that is easily applicable in the acute stroke situation
T. Neumann-Haefelin, MD et al.

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