Magnetic Resonance - Technology Information Portal Welcome to MRI Technology
Info
  Sheets

Out-
      side
 

MRI is trending to low field magnets :
reduced costs will lead to this change 
AI will close the gap to high field 
only in remote areas 
is only temporary 
never 




 
MRI Forum
'Bo'
SEARCH FORUM FOR   
 
Result: Searchterm 'Bo' found in 285 messages
Result Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 [15] 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 
More Results: Database  (490)  News Service  (696)  Resources  (204)  
Forum Overview
 bottom
Schwarz Arni

Sun. 18 Aug.13,
17:11

[Start of:
'Size of B1'
0 Reply]


 
  Category: 
Basics and Physics

 
Size of B1
Hello!
How many Tesla does B1 (the HF pulse) have more or less? What range is applicable? I cannot find information about that anywhere.

Thanks!
Arni
Reply to this thread
(login or register first)
lluis solsona

Wed. 24 Jul.13,
16:03

[Reply (3 of 5) to:
'Job Opportunities in Qatar'
started by: 'Myla Taller'
on Thu. 17 May.12]


 
  Category: 
Jobs

 
Job Opportunities in Qatar
I am an experienced MRI Tech on GE 1.5 & 3T hdxt in the areas of Body,MSK, MRAs,Breast,Neuro,Cardiac..... (more than 20 years)
seeking international opportunities.
I´m from Spain ( Barcelona).


 View the whole thread
Isa Toni Toni

Wed. 24 Jul.13,
14:43

[Start of:
'why there is T2* but not T1*'
2 Replies]


 
  Category: 
Sequences and Imaging Parameters

 
why there is T2* but not T1*
often we heared about T2* but not much of T1*. i heard about T1* before correction in T1 mapping, but i guess that is different than T2 and T2* which have diffirent methods to acquire them. any comments on this is much appreciated
 
 

Isa Toni
 View the whole threadReply to this thread
(login or register first)
Barry Ng

Wed. 10 Jul.13,
17:10

[Start of:
'Titanium & MRI Safety'
2 Replies]


 
  Category: 
Safety

 
Titanium & MRI Safety
I am trying to understand why titanium is considered "MRI Safe".

I see three potential problems when considering the MRI safety of a material:

1 - If it is a ferromagnetic material extreme damaging forces will be applied to the material if exposed to a very strong magnetic field. Titanium is not a magnetic material so I do not see this as a problem.

2 - When a relatively large flat conductor (e.g. a titanium plate) is exposed to a changing magnetic field (Faraday's law) eddy currents will be created internally as the result of induced voltages. These eddy currents can be very high and cause resistive heating ("I squared R losses"). I would think these eddy currents would have the potential to cause extreme heating of the titanium. I know from experience this does occur with steel and titanium has a conductivity about the same as steel. Titanium is not magnetic as is steel but induced voltages due not require a ferromagnetic material (.e.g. copper as used in real world generators, etc.).

3 - Induced voltages are created across the length of a conductor as the result of the conductor being exposed to a changing magnetic field ("genrator effect" - Faraday's Law). Again this effect does not require a magnetic material. So why, at best, does this effect not have the potential to be uncomfortable or even very painful to the MRI patient being exposed to a huge changing magnetic field?

Invariably the response to why titanium is safe focuses on the fact that it is not magnetic. I get the deer in the headlight look when I ask about eddy current heating and induced voltages.

Please help me understand why unduced eddy current heating and induce voltages are not a concern.


 View the whole threadReply to this thread
(login or register first)
prabhjot kaur

Tue. 28 May.13,
07:34

[Start of:
'job related'
1 Reply]


 
  Category: 
Jobs

 
job related
Hello I am an experienced MR technologist (13 years +) with a premier Govt. of India Research Institute.
I want to shift to US with the job in MRI itself. I Please suggest how to go about it.........
 View the whole threadReply to this thread
(login or register first)

Result Pages : 1 2 3 4 5 6 7 8 9 10 11 12 13 14 [15] 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 
 top
 
Share This Page
FacebookTwitterLinkedIn

MR-TIP    
Community   
User
Pass
Forgot your UserID/Password ?    



Look
      Ups






MR-TIP.com uses cookies! By browsing MR-TIP.com, you agree to our use of cookies.

Magnetic Resonance - Technology Information Portal
Member of SoftWays' Medical Imaging Group - MR-TIP • Radiology-TIP • Medical-Ultrasound-Imaging • 
Copyright © 2003 - 2024 SoftWays. All rights reserved. [ 15 March 2025]
Terms of Use | Privacy Policy | Advertising
 [last update: 2024-02-26 03:41:00]