Pulse Sequences: Diffusion
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Diffusion and diffusion-weighted imaging (DWI) is the subject of this section. In our Q&A book from 13 years ago, Jonathan Burdette and I considered diffusion imaging an "Advanced Topic". Today, DWI is so important and widely utilized that it clearly deserves being considered as "basic" pulse sequence.
- What is diffusion?
- What is the difference between isotropic and anisotropic diffusion?
- What is the difference between the diffusion coefficient (D) and the "apparent" diffusion coefficient (ADC)?
- How do you make a DW image?
- What is meant by the b-value? How do I pick it?
- In body imaging a starting b-value of 50 (s/mm²) instead of b=0 is often used. Why is this?
- What is the Trace DW image? How does it differ from the ADC map?
- If a stroke is bright on a standard DW image, why is it dark on the ADC map?
- What is T2 shine-through?
- How does the "exponential" ADC map differ from a "conventional" ADC map?
- I know what T2-shine-through is, but what is T2-blackout?
- Which diseases are "bright" on DW imaging and why?
- What is the diffusion tensor? How is this different from "regular" diffusion?
- What is Diffusion Tensor Imaging (DTI), and how does it differ from "regular" diffusion-weighed imaging?
- How is whole-body DWI performed and why should I use it?