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


Out-
      side
 

Acoustic Noise Reduction (Silent, Quiet, etc.) :
cannot get better 
is in its first steps 
is done by earplugs, headphones 
must get better 
is bad, I miss something 
is unnecessary 




 
MRI Forum: When to shim?
SEARCH FORUM FOR   
Forum Overview

  Category:  General
Reply to this thread
(login or register first)
What is - 
'Forum Notification Service'?  
Matt H

Fri. 27 Oct.17,
13:23
When to shim?
On what sequences should a shim volume be added? (GE scanner)

Steven Ford

Fri. 26 Oct.18,
02:29
you ask a complex question. Any sequence that is not a standard spin echo can benefit from shimming, but its not always worth it.

If you are scanning a knee in the center of the magnet, or nearly so, you might not see much difference in gradient echo scans, which in general are quite sensitive to shim problems. But if you are doing fat-water separation or fatsat images, you will see a difference even in this example.

Because hardware varies, its hard to say in one blanket statement for every case. For sure, do it on fatsat or fat-water imaging. The next most sensitive studies are off-center imaging such as shoulders. Beyond that, you should experiment a little. Of course, erring on the side of caution is a good idea.
 
 

Steven Ford
Professional Imaging Services, Inc.

Forum Overview

  Category:  General
Reply to this thread
(login or register first)
What is - 
'Forum Notification Service'?  
I find television very educating. Every time somebody turns on the set, I go into the other room and read a book.
- Groucho Marx
 
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 • US-TIP • 
Copyright © 2003 - 2018 SoftWays. All rights reserved. [ 14 December 2018]
Terms of Use | Privacy Policy | Advertising
 [last update: 2018-03-08 05:11:00]