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…
Download full paperFile format: .doc, available for editing
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
(“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.
These questions have been responded to in a certain chronological order as follow. Frequencies encoding gradients, as well as phase encoding gradients areboth essential part of the spatially encoded data. It is, thus, true that using the induced differences in the frequency and the phase of precession, makes the data amenable for analysis by the Fourier transform.
However, it is necessary to assume that the frequency of the true resonance will depend on the actual value (local) of the magnetic field in operations. On the other hand, McRobbie, et al, argues that it is also necessary to note that the magnetic field must be uniformly designed, and temporarily superimposed on the focal static field.
According to Hesselink (2010), varied image contrast is achieved using different pulse sequences and variation of the image parameters previously mentioned. The first image contrast technology that should be mentioned is proton density, which refers to the number of protons per unit contained in the image being studied.
The author explains that MRA or Magnetic resonance angiography is a test that is used to evaluate blood flow through the arteries without cutting it open to see. MRA is also used to detect aneurysms within the brain and abnormalities of the blood capillaries in the brain, spinal cord or in the other systems of the body.
Since its implementation into health care settings in the late 1980s, the focus on MRI safety has dramatically increased. This project provides a critical review on best practice MRI safety protocol. The project presents results of a review of peer review literature which is pertinent to MRI safety.
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.
Magnetic Resonance Imaging is among the most popularly deployed clinical diagnostic tools, which works by making use of a “strong magnetic field” to produce “high- resolution anatomical information with excellent soft-tissue contrast”.
In order to carry out the process of MRI, the patient is placed within the MR scanner. A MRI scanner is a large, doughnut or a tunnel shaped magnet open at both ends. The magnetic field generated aligns the atomic particles, known as protons which are positively charged particles and are present in most of the body's tissues.
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
6 Pages(1500 words)Essay
GOT A TRICKY QUESTION? RECEIVE AN ANSWER FROM STUDENTS LIKE YOU!
Save Your Time for More Important Things
Let us write or edit the essay on your topic
with a personal 20% discount.