| Topic: |
Science > Physics |
| User: |
"" |
| Date: |
22 Aug 2005 07:59:33 PM |
| Object: |
What are these symbols in this formula? |
I'd really appreciate it if anyone could help identify the symbols in
Signal Relation formula:
http://bic.beckman.uiuc.edu/mritab1/nmrformulae.html
There are a few that I know, or at least think I know:
First symbol is Magnetogyric ratio of the element.
Second symbol, B, is the magnetic field that the element is in.
Third symbol, N, is total atoms per volume.
Fourth symbol, B, is the field strength of the transmitting coils?
Fifth symbol, g, is unit mass???
Sixth symbol is the Larmor relation.
The seventh symbol, T, is one of the relaxation relations??
BTW, the bottom of that web page contains a few symbol descriptions. I
guess Nx is N and Ye is Y in the formula.
The Signal Relation is the actual signal strength that the receiving
coils would pickup from the entire volume of matter, no?
As an example, what is the signal strength *difference* between H and
Au?
H1:
http://bic.beckman.uiuc.edu/mritab1/H.html
Larmor frequency = 100.000
Gyromagnetic Ratio = 26.7510E+7
Weight = 1.00079
Au197:
http://bic.beckman.uiuc.edu/mritab1/Au.html
Larmor frequency = 1.712
Gyromagnetic Ratio = 0.357E+7
Weight = 196.197
Greatly appreciated!
YT
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| User: "" |
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| Title: Re: What are these symbols in this formula? |
26 Aug 2005 11:12:18 AM |
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wrote:
I'd really appreciate it if anyone could help identify the symbols in
Signal Relation formula:
http://bic.beckman.uiuc.edu/mritab1/nmrformulae.html
There are a few that I know, or at least think I know:
First symbol is Magnetogyric ratio of the element.
Second symbol, B, is the magnetic field that the element is in.
Third symbol, N, is total atoms per volume.
Fourth symbol, B, is the field strength of the transmitting coils?
Fifth symbol, g, is unit mass???
Sixth symbol is the Larmor relation.
The seventh symbol, T, is one of the relaxation relations??
BTW, the bottom of that web page contains a few symbol descriptions. I
guess Nx is N and Ye is Y in the formula.
The Signal Relation is the actual signal strength that the receiving
coils would pickup from the entire volume of matter, no?
As an example, what is the signal strength *difference* between H and
Au?
H1:
http://bic.beckman.uiuc.edu/mritab1/H.html
Larmor frequency = 100.000
Gyromagnetic Ratio = 26.7510E+7
Weight = 1.00079
Au197:
http://bic.beckman.uiuc.edu/mritab1/Au.html
Larmor frequency = 1.712
Gyromagnetic Ratio = 0.357E+7
Weight = 196.197
Greatly appreciated!
Howdy. Looks like it's all correct. T is temperature and g is most
likely atomic weight.
Per the example between 1H and 197Au. 1H has a magnetogyric ratio ~
57.84 times greater than 197Au, but the atomic weight of 197Au is ~
195.4 times more than 1H. If we use the same N for both H and Au then
I get a signal strength difference of 3.313E+006.
I have to admit that don't seem correct. I doubt Au has a weaker NMR
signal strength by a factor over 3 million then H. That equation just
don't jive with me. The NMR receptivity of 1H is only 40,000 times
greater than 197Au. Not sure if that relates to signal strength. Very
few people if any could answer that question. Perhaps the Old Man or
Uncle Al.
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| User: "" |
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| Title: Re: What are these symbols in this formula? |
23 Aug 2005 01:45:15 AM |
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Any help? I am now fairly certain the T is not the relaxation time,
but the temperature.
YT
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| User: "" |
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| Title: Re: What are these symbols in this formula? |
23 Aug 2005 11:10:12 AM |
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Does anyone have any information on the signal strength of two basic
elements compared to each other? I've read about Receptivity, but I
don't think it is a direct correlation to signal strength.
I would appreciate any comparisons in signal strength; e.g., H1 to C13.
YT
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