T1/T2 of water and fat at different field strengths

Ask and answer MRI physics and technical questions here.

T1/T2 of water and fat at different field strengths

Postby saurav2k » Mon Apr 09, 2012 1:52 am

I keep hearing that T1/T2 of water is 3000 ms.

But since T1 and T2 is depends on field strength, can anyone provide details on the T1/T2 values of say, WATER and FAT at various field strengths:
1.5T, 3T, 4.7T, 14T and especially 17.6T?

Thanks
saurav2k
Out of phase
 
Posts: 1
Joined: Mon Apr 09, 2012 1:43 am

Re: T1/T2 of water and fat at different field strengths

Postby Dave Higgins » Tue Apr 17, 2012 3:18 pm

Hi,

I don't really have the answer to your question, but perhaps these nominal values will be a start:

1.0T
T1 | T2
CSF 2100 | 160
FAT 231 | 80

1.5T
T1 | T2
CSF 2400 | 160
FAT 252 | 80

3.0T
T1 | T2
CSF 3120 | 160
FAT 292 | 80

Dave
Dave Higgins
Site Admin
 
Posts: 474
Joined: Fri Sep 02, 2005 2:21 pm
Location: Leeds, UK

Re: T1/T2 of water and fat at different field strengths

Postby PaulB » Thu Apr 26, 2012 3:17 pm

Hi,

I'm also interested in the question. In the link I ploted the values given by Dave with the relationship found by Bottomley et. al (for fat). The relationship was only found for values up to 100MHz. I guess it will be true for higher field strengths??


http://i153.photobucket.com/albums/s235/s1020099/fieldstrength_fatT1.jpg

Greetings,
MRNewbie
PaulB
In phase
 
Posts: 118
Joined: Wed Dec 17, 2008 5:37 pm

Re: T1/T2 of water and fat at different field strengths

Postby wok » Mon Feb 04, 2013 3:40 pm

Dave, would you mind indicating the reference for these values? I have seen similar values on this webpage, but I don't know whether the reference is for the values or for the formula:
Bernstein MA, King KF, Zhou XJ. Handbook of MRI Pulse Sequences. San Diego: Elsevier, 2004. page 609 (ISBN: 0-12-092861-2)
wok
Spin up
 
Posts: 17
Joined: Mon Feb 04, 2013 3:11 pm

Re: T1/T2 of water and fat at different field strengths

Postby Dave Higgins » Tue Feb 05, 2013 11:12 am

I pulled those values from the Philips MR help files on the scanner console.
No reference is quoted there, which is why I called them "nominal".

Dave
Dave Higgins
Site Admin
 
Posts: 474
Joined: Fri Sep 02, 2005 2:21 pm
Location: Leeds, UK


Return to MRI Physics Questions and Answers



Who is online

Users browsing this forum: Bing [Bot], Yahoo [Bot] and 3 guests