Search

# Physics MRI - Essay Example

Summary
If we now double the magnetic field strength, so that B = 3.0 T, the energy difference also doubles, since ΔE is directly proportional to B, by the equation above.
Look at the equation above. Hbar and gamma are constants ; so if I…

## Extract of sample"Physics MRI"

Download file to see previous pages The Larmor (or resonant) frequency ω0 is the frequency at which the nuclide precesses about the magnetic field. The resonant frequency is equal to the magnetogyric ratio γ (specific to the nuclide) times the magnetic field B (Brandolini, 2004):
the nuclide 13C at 75 MHz. From the equation above, the magnetogyric ratio γ is constant so that γ =ω0 /B = ω’0 /B’, where ω’0 is the resonant frequency when the magnetic field B’ = 1.5 T. Solving for ω’0 : ω’0 = (ω0 B’)/B what is the mean B and B
This is explained in the sentence directly above: the single prime corresponds to the resonant frequency when the magnetic field is 1.5 T. You are asking what is meant by B’, but if you look at the sentence above, it was just defined: B’ = 1.5T. It is the magnetic field at 1.5T. B’’ is just a different value of the magnetic field (in this case 4 T) where we are trying to find the frequency w0’’ that corresponds to it.
From this equation, if you know the frequency ω0 and the magnetic field B, then the ratio of these is the gyromagnetic ratio. We know the frequency at 6.9T from the reference cited above. Therefore, to find the frequency at a different magnetic field, we just use the equation w0/B = γ = constant. So another set of corresponding values of w0 and B, call these new values w0’’ and B’’, will also have the same ratio: w0’’/B’’ =γ constant = w0/B. Since we now have w0’’/B’’ = w0/B, we can multiply both sides by B’’ to get: w0’’ = w0 * B’’/B . Hopefully you can now see where that equation comes from.
The reason I didn’t put the calculation down in this case, is because it is EXACTLY the same as the calculation before it, but with different values. You can just follow the equations that were used in the example above it, putting in the ...Download file to see next pagesRead More
Cite this document
• APA
• MLA
• CHICAGO
(“Physics MRI Essay Example | Topics and Well Written Essays - 1000 words”, n.d.)
Physics MRI Essay Example | Topics and Well Written Essays - 1000 words. Retrieved from https://studentshare.org/physics/1592168-physics-mri
(Physics MRI Essay Example | Topics and Well Written Essays - 1000 Words)
Physics MRI Essay Example | Topics and Well Written Essays - 1000 Words. https://studentshare.org/physics/1592168-physics-mri.
“Physics MRI Essay Example | Topics and Well Written Essays - 1000 Words”, n.d. https://studentshare.org/physics/1592168-physics-mri.
Click to create a comment or rate a document
CHECK THESE SAMPLES - THEY ALSO FIT YOUR TOPIC
Physics
...Physics Introduction This paper seeks to answer a number of questions relating to physics.The areas covered include amount of wasted heat, average temperature of exhaust gas, design, amount of energy generated, and finally and estimation of the installation and maintenance costs, size, and weight of your design. 1. Estimate the amount of heat wasted on each mile from a typical car (30 MPG) Heat from any automobile is produced by burning of oxygen. The gas that is produced is carbon dioxide that is usually a product of combustion. Although there are other by-products of combustion, the main by-product is carbon dioxide (CO2). The heat that is produced will be calculated from the amount of carbon dioxide that is produced....
5 Pages(1250 words)Essay
MRI
... of the elbow complex. The Journal of Orthopaedic and Sports Physical Therapy. 17, 279-88.  VAHLENSIECK, M., GENANT, H. K., & REISER, M. (2000).MRI of the musculoskeletal system. Stuttgart, Thieme  VANDEVENNE JE, VANHOENACKER FM, PARIZEL PM, BUTTS PAULY K, & LANG RK. (2007). Reduction of metal artefacts in musculoskeletal MR imaging. JBR-BTR : Organe De La Socie?te? Royale Belge De Radiologie (SRBR) = Orgaan Van De Koninklijke Belgische Vereniging Voor Radiologie (KBVR). 90.)  WILK, K. E., REINOLD, M. M., & ANDREWS, J. R. (2009). The athlete's shoulder. Philadelphia, PA, Churchill Livingstone/Elsevier. YOCHUM, T. R., & ROWE, L. J. (1996). Essentials of skeletal radiology. Baltimore, Williams & Wilkins.... ? MRI Institute...
6 Pages(1500 words)Essay
Physics MRI Essay
...is increased from the center. Conversely, partial volume effect occurs when image losses contrast caused by insufficient resolution, hence one tissue type occupies the same pixel. These processes add up to chemical misregistration. In a case, where the gradient echo images are greater than the spin echo images, the effects mentioned above are more pronounced. This is because it uses low flip angles meaning that T1 recovery will take less time and shorter TR intervals are possible, and lacks the T2 refocusing pulse. References Faulkner, W. 1996. Basic Principles of MRI. [Online]. Available: Hancock, J. 2010. MRI Study Guide. Australian Institute of...
3 Pages(750 words)Essay
Physics
...? Physics The universe is so large and enormous that it cannot be explained in words nor can be imagined by any one. Our earth which feels and seems to us very large is in actual equivalent to a small dust particle in comparison to the enormous universe. Universe consists of a number of different elements. The universe comprises of millions of super clusters. These super clusters consist of hundreds of different sized galaxies. Of such a super cluster is our earth a part of. The super cluster consists of galaxies in the form of groups. The galaxy in which earth is situated is called Milky Way and is situated in a group called the local group which comprises of more than 30 galaxies (Caprara & Harris, 2003). The Milky Way is made... ...
2 Pages(500 words)Assignment
MRI
...?Introduction The acronym MRI stands for Magnetic Resonance Imaging is one of the best knows methods of medical imaging and tissue characterization. This theory was proposed by two eminent scholars of science, Raymond Damadian and Paul Lauterbur, who had been working independently and proposed this new concept roughly in late 1960s. This technique is basically nuclear magnetic resonance imaging, which involves computation of resonance signals obtained when an atomic nucleus is exposed to static magnetic field. MRI makes use of the natural magnetic proprieties of atoms within the body. Due to huge abundance of water in the body, hydrogen atoms are focused upon in this process. Upon applying the magnetic...
6 Pages(1500 words)Essay
Physics
...INTRODUCTION TO PHYSICS The word "physics" is derived from "physis" which means natural development. However physics is the science that studies therelation between matter and energy, thereby gives an integrated outlook to physical phenomena. Even as early as 16th century, the concept of physics inspired many great scientists like Galileo, Newton. But it gained an independent identity in 19th century. New discoveries constantly open new outlook for learning about nature. It is a way of looking at nature from the ground up, and has inspired the philosophies of the twentieth century. Today, the scope of physics is expanding through...
5 Pages(1250 words)Essay
MRI
...of the object. Slice thickness, is one important parameter, which divides the body part being examined into sections of varying width or thickness. The result of examination depends on the slice thickness. If it happens to be a minute problem, then the slice thickness will be small, because a larger slice thickness might result in erasing small lesions or pathologies. MRI is mainly used to look into the brain and the nervous system of human body to figure out the inconsistencies using the functional magnetic resonance imaging, as these parts happen to be the most delicate parts of human body. Prasad (2005, 292) states that the 'MR images are in effect computer generated visual reconfigurations of...
8 Pages(2000 words)Essay
Physics
...Physics (PART A) Question A particle moves with uniform speed v = 2.0 m s along a circular path of radius 5.0 m. Figure shows two points A and B on the circle. The angle subtended by the arc AB at the centre O is π/3 radians. Also shown are the velocity vectors of the particle, vA and vB, when it passes through A and B, respectively. (a) Determine the length of arc from A to B and the time Δt taken for the particle to travel along this arc. (2 marks) length of arc (S) = r · θ = 5.0 * (π / 3) = 5π/3 m. ≈ 5.24 m. (b) Make a similar sketch and draw in the vector representing the change of velocity Δv = vB – vA. Use trigonometry to obtain the magnitude |Δv|. (Some useful construction lines are shown dashed in...
2 Pages(500 words)Speech or Presentation
MRI
...MAGNETIC RESONANCE IMAGING by of the school/ of the Describe how MRI sequences spatially en nuclei in the read and phase direction. Spatial encoding in read direction Readout or frequency encoding is achieved by encoding the signals along a direction in space with varying frequencies. Here, the spin echo signal is sampled n number of times where n is the number of projections along the frequency-encoded axis. To rebuild the distribution of the sources along the encoded direction, it is generally essential to obtain a set of signals with a suitable set of frequencies. When there are no other position encoding components present, the FT of the signal that results is simply a one-dimensional projection profile of the...
2 Pages(500 words)Essay
MRI
...MRI Brochure A to parents and carers It is suggested that parents and children study the brochure before coming for an MRI scan. Reading the brochure makes the children prepared for the examination and thus they accept the examination requirements. Children remain calmer during the examination and behave accordingly if they bring their favourite toys, pillows or blankets with them. If a child listen some favourite music, parents are advised to bring CDs or Players with them as it provides comfort during examination. In case of any apprehensions about the procedure, it is advised to discuss it with the Radiographer a technologist trained in medical imaging) or Radiologist (a doctor who specialises in...
6 Pages(1500 words)Essay
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 Physics MRI for FREE!
+16312120006