MRI diffusion

MRI diffusion.

MRI diffusion Discuss the process of obtaining diffusion information using MRI. Your answer should include: How MRI is sensitised to diffusion? The effect on stationary and moving spins? The effect of physiological motion on diffusion-weighted images? How different diffusion weightings are achieved? Measurement of diffusion information.? Answer is based on provided 3 modules and the resources should be at least 20 references Images and figures can be taken from modules and it is highly recommended to get more images and figures from additional sources. Comments of tutor on one answer for one student (sample 2) is uploaded for you, however both sample answers are important ( sample answer one are very good and achieved high mark however answe3r 2 has got some good information) and the comments on sample answer 2 are as follows (however, please see them in the uploaded file) : It is highly needed to demonstrate the understanding of diffusion equations: b value. ADC, FA Isotropic vs anisotropic diffusion measurements Ways to determine ADC accurately. Explain stejskal tanner diffusion . all of the phase shifts and refocusing by diffusion gradients should be explained and also the role of the 90 and 180 pulses . What is the disadvantage of single shot EPI? Equation of b- value need to be explained and how you optimize parameters little delta, big delta, G and TE to achieve optimum b value and SNR Explain anistropic and isotropic diffusion and ways to measure them accurately Definition of ADC and what DETAILED information you can get from these measurements.

MRI diffusion

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