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Ok, i need a bit of information or if you want you could just give me the answers i guess

Well.. its for the people that have knowledge of medical physics, i just need some information on MRI and the factors that influence the signal intensity in MRI..

Would appreciate anyone helping with information towards these factors
If someone becomes enough of a help, i am sure when i come off vacation mode i could find a suitable payment, either naq/uu or maybe a free sig

My roommate is in med school. When he comes back i'll link you to what you need.

google is your friend.

i have tried google.. and most of the sites had a good sort of introduction to it and then started to go off topic towards the information i needed.

Ashu wrote:My roommate is in med school. When he comes back i'll link you to what you need.

Thanks

id suggest you try looking at the different types of MRI

as far as i can recall, MRI is usually performed on H atoms electron spin, however, it can be calibrated to act on other atoms

the intensity of the image should be heavily dependent on the magnetic field strength used

Londo Mollari wrote:id suggest you try looking at the different types of MRI

as far as i can recall, MRI is usually performed on H atoms electron spin, however, it can be calibrated to act on other atoms

the intensity of the image should be heavily dependent on the magnetic field strength used

and thus, the current supplied to the electromagnetic coil.

~soul

Solus wrote:

Londo Mollari wrote:id suggest you try looking at the different types of MRI

as far as i can recall, MRI is usually performed on H atoms electron spin, however, it can be calibrated to act on other atoms

the intensity of the image should be heavily dependent on the magnetic field strength used

and thus, the current supplied to the electromagnetic coil.

~soul

not strictly true

depends both on the current and the number of coils

although thats for a standard incuded electromagnet, things get wierd when you use a paramagnetic material

Londo Mollari wrote:not strictly true

depends both on the current and the number of coils

true, however if we're looking at the factors of signal intensity, what CAN we alter? what CAN be changed to alter the signal? its a big electromagnet, so unless you can make sections of EM coil disappear.... no. the EM coils are fixed, the variable here is the current.

~soul

Solus wrote:

Londo Mollari wrote:not strictly true

depends both on the current and the number of coils

true, however if we're looking at the factors of signal intensity, what CAN we alter? what CAN be changed to alter the signal? its a big electromagnet, so unless you can make sections of EM coil disappear.... no. the EM coils are fixed, the variable here is the current.

~soul

effective number of coils can easily be changed by short circuiting, which is much quicker and less energy intensive than changing current flow

Londo Mollari wrote:

Solus wrote:

Londo Mollari wrote:not strictly true

depends both on the current and the number of coils

true, however if we're looking at the factors of signal intensity, what CAN we alter? what CAN be changed to alter the signal? its a big electromagnet, so unless you can make sections of EM coil disappear.... no. the EM coils are fixed, the variable here is the current.

~soul

effective number of coils can easily be changed by short circuiting, which is much quicker and less energy intensive than changing current flow

as I said via MSN, i'd prefer to keep short circuiting out of such a sensitive device......

~soul

and as i said, short circuiting is cheaper, easier and more accurate

if you wanted to change the current, you'd have to alter the supply voltage, which would be costly


@ ~jin~, as i mentioned before, id recommend you look at the different forms of NMR available, it's all dependent on what you are trying to examine, some methods are better than others