Recent content by offerbh

you just not helping in this furoms, why?

When I do MRI, after I send the Pulse radio, I get signal. There longitudinal magnetic and Transverse magnetic , their signal is shared or that two separate signals which are received with the antenna and create an image?

Hello again, I wanted to ask you about Pulse 90 and pulse 180 in MRI - I understand that the role of the 90 pulse is to separated the longitudinal magnetic of the proton from the external magnetic and this allowing measurement. Pulse also creates a common occurrence between the protons. Now we...

I understood the physics behind NMR is similar like the physics behind the MRI. Is relaxation underlies more to mri then for NMR? What is the difference in a few words Between NMR and MRI from the Physics view?

Ok, but now you are talking about giving the signal during the relaxation, am I right? I understand that the molecule in which the proton of the hydrogen, ie environment, more big - it will be different Signal relatively small molecule , such as water molecules?

All this is calculated by the Larmor formula when inside taken into account, among other things, the external magnetic field strength and gradient strength may also-but how is take into account the environmental changes that affect the frequency of each proton and proton?

Ok, and I understand that the frequency of this pulse is 42.58 MHz/T, but the pulse must be with Frequency Range Because proton frequencies are slightly different from each other depending on their environment (although the intensity of the magnetic field is the same) - Otherwise he would not be...

Of course, it Effect Zeeman (English is not my native language so I'm kinda having trouble translating, sorry about that). What I don't understand is the relationship between the external magnetic field, protons and the radio pulse- The radio pulse is in the frequency of the hydrogen nucleus (...

Thank. Let's look at it from the perspective of a radio pulse sent to the tissue. It give to the proton energy changing the position of the protons. Now, when they make relaxation, They emit energy that received differently because of the different environment of electrons?

No one knows?

Thanks, Maybe you could elaborate a little more about this process- We can distinguish between tissues because the shifted in resonance frequency of the hydrogen nucleus that cause because of their environment?

Hello all, I know that MRI is focuse on Hydrogen proton, but I don't understand if it focuse just in the Hydrogen proton that in water (Liquids) of the body or in all the Hydrogen proton that are within the molecules in the body. In relation to this, how the MRI could distinguish...