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

Out-
      side
 

Personalized protocols (age, gender, body habitus, etc.) lead to :
more automated planning 
improved patient comfort 
better diagnostics 
optimized image quality 
nothing 
 
MRI Forum
'MRI'
SEARCH FORUM FOR   
 
Result: Searchterm 'MRI' found in 415 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 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 [73] 74 75 76 77 78 79 80 81 82 83 
More Results: Database  (561)  News Service  (1300)  Resources  (333)  
Forum Overview
 bottom
Paul Tesla

Fri. 16 Nov.07,
08:55

[Reply (1 of 4) to:
'Haste and Rare sequences'
started by: 'Elena sussi'
on Tue. 13 Nov.07]

 
  Category: 
Sequences and Imaging Parameters
 
Haste and Rare sequences
RARE is the Generic name for TSE or FSE. So I guess you should say "Single-shot RARE with half fourier acquisition".

source: MRI. From picture to proton. D.W McRobbie
 View the whole thread
Paul Tesla

Fri. 9 Nov.07,
15:31

[Start of:
'How do you measure SNR?'
0 Reply]

 
  Category: 
Basics and Physics
 
How do you measure SNR?
I know this is a basic question but how do you measure SNR?

This page:
http://dnl.ucsf.edu/users/dweber/dweber_docs/mri_quality.html

tells me to measure an as small as possible ROI for the signal mean and as large as possible ROI for the standard deviation.

But I have a book called "MRI from picture to proton": This says that the standard deviation of the noise (Sn) can be measured using the mean or standard deviation (sd) of a background region. Then you can use the relationship:

Mean = 1.25 Sn
sd = 0.66 Sn

to find Sn. But where do the values 1.25 and 0.66 come from?

It also says that the measured mean of the signal ROI is related to the MR signal instensity (S) using:

Mean = sqrt(S^2 + Sn^2)

But why do they add up quadratically?

Thankyou for your help. Please leave a message or email me,

Paul

-------------
mri.tesla@gmail.com
Reply to this thread
(login or register first)
bob smith

Wed. 17 Oct.07,
06:41

[Reply (1 of 2) to:
'does the metaloceramic dental crowns are problem for MRI'
started by: 'Dimitar Todorov'
on Thu. 9 Mar.06]

 
  Category: 
Safety
 
does the metaloceramic dental crowns are problem for MRI
hey everyone

I had an MRI (1.5 Tesla) and I have a dental crown and bridge, and metal fillings. I think I have the metal bonding porcelain crowns made with Nickel-Chromium, but it doesn’t matter. You will feel nothing. It doesn’t matter if you have titanium, or anything else. The MRI people are more worried about metal in soft tissue which can move around during the scan. Anything on your teeth or bone is fixed and therefore won’t cause problems. And for the patient, who cares about pain / discomfort, there is none, you’ll experience no sensation at all due to dental work.

Hope this helps
 View the whole thread
venkata srinath gudala

Mon. 15 Oct.07,
07:15

[Reply (5 of 6) to:
'Examinations of children'
started by: 'George'
on Sat. 22 Nov.03]

 
  Category: 
Applications and Examinations
 
Examinations of children
particularly childrens around 2yrs-8yrs its better to wake them up early than usual and allow them to play or take them for a ride(not to make sleep till they reach mri centre) 60% of children will coperate (with out sedation)
 View the whole thread
Ilene Williams

Tue. 14 Aug.07,
18:55

[Reply (6 of 11) to:
'MRI Study Guide'
started by: 'Nicole DeMoss'
on Fri. 10 Mar.06]

 
  Category: 
General
 
MRI Study Guide
One of your members recommended www.mrireviewstore.com. I ordered a CD from them for $70 and it has nothing on it. I've tried to contact them but have gotten no response. Any suggestions or help on this matter?
Ilene Williams
 View the whole thread

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 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 [73] 74 75 76 77 78 79 80 81 82 83 
 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 - 2025 SoftWays. All rights reserved. [ 21 May 2025]
Terms of Use | Privacy Policy | Advertising
 [last update: 2025-05-13 01:28:00]