Echo Planar Imaging, or EPI, Fast Imaging Techniques (MRI) Essay - 1

Echo Planar Imaging, or EPI, Fast Imaging Techniques (MRI) - Essay Example Different results have been found from different body areas which have varying magnetic field strengths thus such body areas end up having varying processional water frequencies. Blood has been observed to have the highest susceptibility as it has iron contents as one of its components. 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.e. increase or decrease). (2 marks) Slew rate and the receiver bandwidth Each of the listed parameters has a different way of changing it. For example, the case of slew rate increment, an overall reduction in echo spacing as well as reduction in geometric distortion is required for it to be altered. For receiver bandwidth to be increased, an overall reduction in echo spacing, signal to noise ratio and geometric distortion need to be lowered (Van Der Zwaag, at el. 2012, p. 129) In a normal scenario, MR equipments take their time until the trapezoid gradient gets to the flat top. When this time comes, the data points will then be sampled by the MR equipments in the direction of the frequency. This implies that no data acquisition takes place during the rise time. The rise time refers to the time when the gradient is not yet at its minimum or maximum amplitude. However, by employing ramp sampling method, the data points witnessed during the readout gradient switching can be acquired during the rise time. a) Two different features can be used while employing ramp sampling, and they include; 1. Having the geometric distortion minimized; ramp sampling can be used to reduce the flat top while at the same time keeping the Nx constant. This implies that the echo spacing can be decreased consequently minimizing geometric distortion. 2. Increasing resolution; by keeping the flat top at the same level, more Nx data points can be fitted during readout and thus increasin g the overall resolution. b). Using Conjugate Synthesis; Conjugate synthesis is a symmetry property which means that only half of the raw data spaces in the whole MR can be acquired to come up with a Mr image that is complete. 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. c). Slew rate enhancement d). Echo train length reduction e) Making use of shimming to minimize distortion d). Employing parallel imaging to minimize echo spacing f) . Making use of Multi shot EPI so as to ensure that there are no cases of phase errors building up. g). Through increasing the TE which will in turn increase the transverse magnetization hence larger T2* and T2 (b) Discuss the chain of consequences if you optimize the image by increasing the receiver bandwidth. (4 marks) Receiver bandwidth generally describes how fast an MR signa l can be digitized. In cases where the receiver bandwidth is generally higher, there is a corresponding faster digitization of the produced image. This is because the aspect of receiver bandwidth is inversely proportional to the time taken during the imaging process. The receiver bandwi

Education and Life Personal Statement Example | Topics and Well Written Essays - 500 words

Education and Life - Personal Statement Example It is not only satirical, beautiful and esthetical, but also a testimony of the ancient patrimony (Efland, 2010). These reasons make me want to be involved in the discipline by enrolling for a course in History of Art. My attachment to arts started in the school years where I was able to obtain outstanding grades in history, literature and art subjects. The passion did not stop in class as it continued up to my social life when I attended several culture seminars and exhibitions. During these events, I also developed interest in photography. I admired the various mixtures of arts and information captured by legendary photographers like Cartier Bresson. Furthermore, understanding photography makes it even easier to understand artistic works from various regions of the world (Gardner & Kleiner, 2009). Outside the classroom, I have been lucky enough to be involved in exhibitions in my home town during the summer. I took part in researching and drafting the press books that were to be used in these particular exhibitions. It was a challenging and demanding duty that involved noting down the content of the exhibition and summarizing them for people to be able to easily read about what was taking place. I enjoyed taking part in this research since it gave me a chance to have a deeper insight into various art works that were in the exhibition. Apart from art, I enjoy listening to music. Blues, rock and jazz are my favorite. I try to attend concerts so that I am able experience the enthusiasm and the spectacle that make the shows a success. Moreover, I am a travel enthusiast .I enjoy this as it not only allows me to meet new people and encounter new cultures, but also exposes me to the art work in the areas I visit. It is through these trips that I come to understand how the local populations interpret and view their works and how their pieces of