CHECK THESE SAMPLES OF Factors affecting quality of MRI image.Benefits of circular or square spiral EPI methods
Modules 3 to 5 discuss various methods to correct for magnetic susceptibility distortions, while maintaining a good EPI image.... Compositions based on water also have high susceptibility in comparison with air (McRobbie 2007) (a) List the parameters that could be changed to optimize the epi image in this case, plus how you would change the parameter (i.... The most desirable means to achieving high resolution during a single shot epi experiments is through having the readout duration on the ky to be as long as possible so as to have only the negative and positive kx values....
14 Pages
(3500 words)
Essay
Sampling of k-space is different in EPI that enables high quality of images acquired.... EPI compared to conventional fast imaging methods: EPI uses the Blip EP method of phase encoding where each phase blip between echoes causes a shift in k-space line.... BLIP Echo Planar Imaging (epi) method- Principles of epi: epi, like FSE (Fast Spin Echo), is an imaging method that reduces the imaging time as it acquires multiple phase encoding steps in each repetition time (TR)....
10 Pages
(2500 words)
Essay
For example, one of the potential benefits of segmentation is that it allows EPI to be able to effectively run on the conventional systems where single short EPI can not be used.... The first option is, however, counter-productive because it may increase the amount of time needed to perform the overall scan while the second option if often preferred because it helps maintain the original objective of choosing epi.... Discuss the advantages and disadvantages of using segmentation in epi....
6 Pages
(1500 words)
Essay
The very large cost of mri machines and their large size and specialized installation requirements acts as a deterrent to wider use of this technology.... There is work underway that promises reduced costs and size of mri machines, especially in the form of specialized machines for the scan of extremities such as wrists and ankles.... hellip; When the external magnetic pulse is removed, the spinning protons induce an electric signal in pick up coils from which an image of the internal tissue is created digitally....
8 Pages
(2000 words)
Research Paper
epi in MRI Name Tutor Course College Date Parallel imaging is a technique that has been used widely in the current clinical applications.... When parallel imaging is applied with reduction factor, MR acquisition which is not accelerated is required in reconstructing an image data set that has the same geometry and spatial resolution without using acceleration.... The advantage of reduced motion artefacts has led to the improved image quality (Schoenberg, Dietrich & Reiser, 2007, p....
10 Pages
(2500 words)
Assignment
? Spiral scanning methods (square and circular): Points in k space are also not collected uniformly in time (that is, in the line by line method we are familiar with).... ? Make sure they have ear protection (both ear plugs and headphones if possible) and warn them that epi is a loud sequence, with high pitched noises.... ? Obviously if you want to image or measure fat, then epi is not the sequence for you.... ? Also if the patient has braces and you want to image their brain with epi that is also not going to work - either due to susceptibility distortions or B1 in homogeneities, depending upon what the braces are made of....
6 Pages
(1500 words)
Coursework
More often than not, there are a number of… These parameters include magnetic susceptibility, k-space line, spin echo sequence, duration of the epi trajectory, phase direction and gradient (Ye et al, 1996, p.... K-space line is another parameter that could be optimized so as to change the epi.... Undeniably, epi makes use of a gradient echo sequence, thus leading to the accumulation of the effect with no radiofrequency (RF) pulse to correct the same....
12 Pages
(3000 words)
Essay
hellip; A sampling of k-space is different in EPI that enables a high quality of images acquired....
EPI compared to conventional fast imaging methods:
EPI uses the Blip EP method of phase encoding, where each phase blip between echoes causes a shift in the k-spaceline.... This paper ''BLIP Echo Planar Imaging Method'' tells that FSE (Fast Spin Echo), epi is an imaging method that reduces the imaging time as it acquires multiple phase encoding steps in each repetition time (TR)....
10 Pages
(2500 words)
Report