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| Result: Searchterm 'Bo'
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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
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Chantel Keed
Fri. 26 Oct.07,
04:14
[Start of:
'MRI study guide for a physics dummy'
2 Replies]
Category:
Basics and Physics
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| MRI study guide for a physics dummy |
I did MR for 11 months and have been out of the field for a few yrs. Registry eligibility about to run out. I would appreciate recommendations for best study guides. I learned to scan w/in a wk, but never really learned how the image was produced. A study guide from a VERY basic start point would be most helpful. Also, any recommendations on exam prep courses. Thank you for your time and any information you share.
chantelkd@yahoo.com
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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
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edy lev
Fri. 21 Sep.07,
15:29
[Start of:
'claustrophobia and mri'
1 Reply]
Category:
Patient Care and Comfort
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| claustrophobia and mri |
I have to scan my leg only, is it necessary to enter my whole body into the machine?
thanks
edy
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Roberto Reyes
Wed. 6 Jun.07,
03:20
[Start of:
'Purchase Decision'
2 Replies]
Category:
Devices, Scanner, Machines
|
| Purchase Decision |
Hello, I am in the process to buy a MRI. I have quotes from GE Signa 1.5T HD, and Siemens Symphony 1.5T (NO TIM)
Can any give me comments about each system? Want to know which system you recommend and why?
Regards
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