Nobody downloaded yet

Diffusion weighted (DW) Magnetic Resonance Imaging MRI - Essay Example

Comments (0) Cite this document
Diffusion-Weighted (DW) Magnetic Resonance Imaging (MRI) Table of Contents I. Introduction 3 II. Background on Diffusion 3 III. MRI and Diffusion 4 A. How MRI is Sensitized to Diffusion 4 B. Moving and Stationary Spins- Effects 7 C. Diffusion-Weighted Images- Effect of Physiological Motion 9 D…
Download full paperFile format: .doc, available for editing
GRAB THE BEST PAPER97.4% of users find it useful
Diffusion weighted (DW) Magnetic Resonance Imaging MRI
Read TextPreview

Extract of sample
"Diffusion weighted (DW) Magnetic Resonance Imaging MRI"

Download file to see previous pages The exploration of diffusion in MRI includes the way MRI is sensitized to diffusion; the effects of spins, both stationary and moving spins; how diffusion-weighted images are affected by physiological motion; the how of the achievement of the various diffusion weightings; and information on diffusion and how those are measured (Hagmann et al. 2006; Mori and Barker 1999, pp. 102-106; Tonarelli 2012; Parker 2004, pp. S176-S178; Everdingen et al. 1998; Barker 1999; Maas 2005; Le Bihan et al. 2006; Yablonskiy et al. 2003; Koh and Collins 2007; Le Bihan 2011; Basser and Jones 2002; Battal et al. 2012; De Foer 2010; Luypaert et al. 2001; Williams et al. 1992; Topgaard 2006) II. Background on Diffusion Diffusion on the molecular level is said to be the result of natural Brownian movement, where molecules randomly move through the diffusion medium because of the agitation caused by thermal characteristics of the medium. In all the displacement of the molecules comes up to zero by mean figures, but over time, there are positive probabilities associated with the non-zero movement of a molecule, so that over time, a molecule is said to probably have moved from an initial position at an earlier time. Here the time elapsed corresponds to a correlation with the distance moved, where different fluids acting as diffusion mediums determine the distance as characterized by the diffusion constant for that liquid type. There is a difference between the freely diffusing movement of water molecules, meanwhile, to the diffusion of liquids in the tissues of human beings, so that in human tissues one talks of an ADC, or an apparent diffusion coefficient, to be differentiated from the free diffusion coefficients of liquids outside of human bodies, such as those used to characterize water in containers at certain temperatures. On the other hand, for human tissues, various considerations further come into play, such as differences in the mobility of different fluids in different parts of the body and in different parts of a particular organ, such as the human brain. Boundary conditions also differ for liquids found in different body parts. All these affect the coefficient of diffusion in various ways, with the general observation that the ADC is generally smaller in comparison to the free diffusion coefficients of liquids like water outside of the human body (Luypaert et al. 2001; Roberts and Rowley 2003). Going into diffusion types, meanwhile, there are two, one being isotropic diffusion and the other being anisotropic diffusion. In isotropic diffusion, the rate of diffusion is the same in all directions, and so the resulting diffusion distribution is spherical. In anisotropic diffusion, the diffusion rate depends on where the diffusion is oriented, and there is uneven diffusion in different directions. The distance of the diffusion is orientation-dependent, in other words, and the diffusion distribution is characterized by an ellipsoid (Module 1 2013). III. MRI and Diffusion A. How MRI is Sensitized to Diffusion In a hypothetical case, the typical distribution of displacement of water molecules in such a container is said to follow a bell curve, with majority of the water molecules able to travel only for short distances from their initial location, whereas a few of the water molecules are able to be displaced at further distances from average. For a given initial temperature of the water, moreover, ...Download file to see next pagesRead More
Cite this document
  • APA
  • MLA
(“Diffusion weighted (DW) Magnetic Resonance Imaging MRI Essay”, n.d.)
Diffusion weighted (DW) Magnetic Resonance Imaging MRI Essay. Retrieved from
(Diffusion Weighted (DW) Magnetic Resonance Imaging MRI Essay)
Diffusion Weighted (DW) Magnetic Resonance Imaging MRI Essay.
“Diffusion Weighted (DW) Magnetic Resonance Imaging MRI Essay”, n.d.
  • Cited: 0 times
Comments (0)
Click to create a comment or rate a document
Anatomy in MRI (Magnetic resonance imaging)
... Fundamental Musculoskeletal Magnetic Resonance Imaging What is a synovial joint? Ans- Synovial jointis a joint in which the opposing bone ends are covered in articular cartilage and separated from each other by a joint cavity containing synovial fluid. E.g. shoulder joint, hip joint, ankle and knee joint. 2. Name 2 regions in the body where fibro-cartilaginous discs are found Ans- Fibro cartilaginous discs are found at the menisci of knee joint and vertebral column wherein vertebras are connected by fibro-cartilaginous discs. 3. Where does the Subscapularis muscle arise? Ans- Subscapularis muscle arises from the sub scapular fossa on the anterior face of scapula. 4. Where, and via what structure does the Subscapularis muscle attach? Ans... and the...
22 Pages(5500 words)Essay
Echo Planar Imaging, or EPI, Fast Imaging Techniques (MRI)
...with sickle cell anemia who are at risk for stroke. The extent and presence of potentially feasible tissues in ischemic penumbra can be determined through perfusion (Atlas, 2008). Thus, the diagnosis of risk within the tissues through EPI means EPI might considerably turn as patients’ rational option for the therapy of acute stroke. Above figure are the example of a (a) CBV and (b) CBF map, compared with(c) diffusion weighted image (Gillard, Waldman and Barker, 2004). References Atlas, S. W. (2008). Magnetic Resonance Imaging of the Brain and Spine, LWW medical book collection 1. Lippincott Williams & Wilkins. Bankman, I. (2008). Handbook of...
15 Pages(3750 words)Essay
Echo Planar Imaging, or EPI, Fast Imaging Techniques (MRI)
...? By of Learning: Article Critique Paper Modules 3 to 5 discuss various methods to correct for magnetic susceptibility distortions, while maintaining a good EPI image. Consider the following clinical setting: You require a T2-weighted image which covers the whole of the brain, where the field of view and matrix size have been fixed at 23 cm x 23 cm, and 128 x 128 respectively. Introduction Magnetic susceptibility refers to the process y issue tissue affects magnetic field. The existing boundaries between fat and compact bone are normally affected by the transverse magnetic field de-phasing and signal distortion. The consequent of...
10 Pages(2500 words)Essay
Magnetic Resonance Imaging (MRI)
...?INTRODUCTION Magnetic Resonance Imaging (MRI) is one of the more commonly used imaging techniques used to aid diagnosis. It uses powerful magnets and radio waves to make images (Dugdale, 2010). However, emotional distress and lack of immobility not only lessen the quality of the resulting image, but it also causes adverse effects onto the health of the patient. Figure 1 shows an example of an MRI image from a moving patient. In such cases, use of sedation or general anesthesia is warranted to increase tolerance to an unpleasant but necessary procedure, and to expedite...
7 Pages(1750 words)Essay
Perfusion-weighted imaging (PW) MRI (magnetic resonance imaging)
...migraines. Perfusion-weighted imaging methods have already been utilized in many practices. Diffusion-weighted magnetic resonance imaging (MRI) has developed a recognized technique for the not affecting assessment of rational ischemia mutually in animal prototypes and humans (Moseley, et al., 1995). These are effective techniques to sense ischemic brain damage within minutes after its start, while additional conservative illustration methods for example computed tomography remain unsuccessful to notice such wound for numerous hours ranging from one to five. Williams et al. created a two-coil continuous arterial...
12 Pages(3000 words)Essay
The Use of CT, MRI and PET Scan Imaging in Visualizing the Early and Late Stage of Prostate Cancer. Discuss how the image findings may influence the radiotherapy planning process
...., & Anderson, C. (2007). Pathophysiology: Functional Alterations in Human Health. Baltimore, MD: Lippincott Williams & Wilkins. Carroll, P., Coakley, F., & Kurhanewicz, J. (2006). Magnetic Resonance Imaging and Spectroscopy of Prostate Cancer. Reviews in Urology, 8(Suppl 1), S4-S10. Groves, A., Beadsmoore, C., Cheow, H., Balan, K., Courtney, H., Kaptoge, S., et al. (2006). Can 16-detector multislice CT exclude skeletal lesions during tumour staging? Implications for the cancer patient. European Radiology, 16(5), 1066-1073. Haider, M., vanderKwast, T., anguay, J., Evans, A., Hashmi, A.-T., Lockwood, G., et al. (2007). Combined T2-Weighted and...
6 Pages(1500 words)Essay
Dynamic Nuclear Polarization MRI.What is it and what is its potential for medical imaging
6 Pages(1500 words)Essay
Anatomy in MRI (Magnetic resonance imaging)
...tensor MRI-based muscle fibre tracking. Magnetic Resonance in Medicine, 48, 97-104. Frank, L., Jung, Y., Inati, S., Tyszka, M., & Wong, E. (2010). High efficacy low distortion 3D diffusion tensor imaging with variable density spiral fast spin echoes (3D DW VDS RARE) NeuroImage. 49, 1510 – 1523. Gold, G.E., Chen, C.A. & Koo, S. (2009). Recent advances in MRI of articular cartilage. Musculoskeletal Imaging- Review, 193. [Online]. Available from: Department of Radiology, [Accessed: February 11, 2013]. Link, T.M. MRI of cartilage: Standard...
13 Pages(3250 words)Essay
Magnetic Resonance Imaging (MRI)
...Magnetic Resonance Imaging Number Introduction and Definition MRI (Magnetic Resonance Imaging) is a contemporary technique of diagnosis that observes the internal tissues of the body without employing X-rays. It is a highly essential technique for ascertaining deviations in joints, the vessels of blood, the spinal cord and brain, and other organs in the body. When in use, the machine takes images of the target organ in various angles which are then processed using a computer to yield a picture of high detail of the area selected for observation. Basically therefore, the technique makes use of a computer, an...
6 Pages(1500 words)Essay
sponsored ads
We use cookies to create the best experience for you. Keep on browsing if you are OK with that, or find out how to manage cookies.
Let us find you another Essay on topic Diffusion weighted (DW) Magnetic Resonance Imaging MRI for FREE!
logo footer
Contact us:
Contact Us Now
FREE Mobile Apps:
  • StudentShare App Store
  • StudentShare Google play
  • About StudentShare
  • Testimonials
  • FAQ
  • Blog
  • Free Essays
  • New Essays
  • Essays
  • Miscellaneous
  • The Newest Essay Topics
  • Index samples by all dates
Join us:
Contact Us