Download Diffusion MRI: From quantitative measurement to in-vivo by Heidi Johansen-Berg, Timothy E.J. Behrens PDF
By Heidi Johansen-Berg, Timothy E.J. Behrens
Diffusion MRI is a magnetic resonance imaging (MRI) technique that produces in vivo pictures of organic tissues weighted with the neighborhood microstructural features of water diffusion, supplying an efficient technique of visualizing sensible connectivities within the fearful procedure. This booklet is the 1st complete reference selling the certainty of this quickly evolving and robust expertise and supplying the basic guide for designing, examining or studying diffusion MR experiments.
The publication provides diffusion imaging within the context of well-established, classical experimental ideas, in order that readers could be in a position to investigate the scope and barriers of the recent imaging know-how with appreciate to concepts on hand formerly.
All chapters are written via major overseas specialists and canopy method, validation of the imaging know-how, software of diffusion imaging to the research of edition and improvement of ordinary mind anatomy, and disruption to the white topic in neurological ailment or psychiatric sickness.
. Discusses all points of a selection MRI research from acquisition, via research, to interpretation, delivering an important reference textual content for scientists designing or reading diffusion MR experiments
. functional recommendation on operating an experiment
. complete colour all through
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Extra resources for Diffusion MRI: From quantitative measurement to in-vivo neuroanatomy
18 Plot of Mz vs. time for a FLAIR experiment. After an rf inversion pulse (time 0), the longitudinal magnetization (Mz) from CSF, gray matter (GM), and white matter (WM) recover at different rates. If one excites the spins into the transverse plane when the CSF magnetization becomes zero, CSF appears black in the image. I. Introduction to Diffusion MRi 30 2. Pulse sequences for diffusion-weighted MRI obtaining diffusion-weighted images, eliminating some of the challenges of SSEPI, and introducing new challenges as well.
More symmetric sampling helps to overcome artifacts from asymmetrically collected data in the presence of head rotation. Cardiac gating helps to mitigate signal loss from tissue shear during the diffusion-weighting gradients. 10. As stated earlier in this chapter, any bipolar gradient gives a phase to spins which is proportional to their velocity. If one applies two sets of bipolar gradients which are equal in magnitude but opposite in order, then any spin moving with a fixed velocity during both sets of bipolar gradients receives equal and opposite phases, respectively, which cancel each other out.
The first is patient heating from rf power deposition, also known as specific absorption ratio, or SAR. This is a well-characterized effect, and scanners limit the amount of rf power that can be used in a sequence to limit patient heating. This effect scales with B02, and SAR can be limiting at 3 tesla in some applications such as FSE methods unless lower flip angles are used for refocusing. The second effect is called magnetization transfer, or MT, saturation. While an rf pulse excites the water and fat protons in a given slice, it also saturates the magnetization of protons bound to various molecular structures.