MRI summary r1

MRI summary r1 - For each imaging modality we examine we...

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For each imaging modality we examine we want to know: 1. What are the fundamental physics that underpin the modality? 2. What is the input, what is the output (how do we make an image)? 3. What is the basic cascade of subsystems (what is the hardware diagram)? 4. What determines the contrast between regions in the system? 5. What limits/determines the resolution/PSF of a system in the modality (what parameters)? 6. What is the noise source for the system (what parameters)? 7. What are the sampling requirements for the system? 8. What parameters can be manipulated to effect tradeoffs of resolution, noise and contrast? 9. What bioeffects limit the safe use of the system? 10. What are the main artifacts peculiar to the system and how can they be avoided/manipulated?
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1. What are the fundamental physics that underpin the modality? Nuclear magnetism, given by the gyromagnetic ratio, for 1H, γ=42.57mHz/T. Some nuclei have γ=0. Larmor equation: f L = γB 1 Formation of bulk magnetization, M, a vector (“proton density”, PD), tilting of magnetization by an rf pulse, precession of the
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MRI summary r1 - For each imaging modality we examine we...

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