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| Result: Searchterm 'Range'
found in 21 messages |
| Result Pages: 1 2 3 [4] 5 |
More Results:  Database (79) News Service (25) Resources (10) |
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Dan McGuan
Thu. 6 Oct.05,
20:35
[Reply (1 of 2) to:
'Machine Opening artifact'
started by: 'Neil Brice'
on Tue. 28 Sep.04]
 Category:
Artifacts
|
| Machine Opening artifact |
Neil,
I think you're talking about the edges of the shimmed volume of the magnet, or the coil.
Magnets are shimmed to a specific volume in the field (every model magnet is different). When you attempt to scan an object that reaches the edge of this volume you will see distortion from imaging the unshimmed area of the magnet.
Also shimming large objects that exceed the range of the receiver portion of the coil will cause distortions.
Hopefully this answers your question?
Good Luck,
Dan McGuan
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|  View the whole thread | | |
Susan Angelico
Thu. 15 Sep.05,
20:07
[Reply (1 of 3) to:
'3T imaging parameters'
started by: 'Nancy Dudek'
on Fri. 26 Aug.05]
Category:
Sequences and Imaging Parameters
|
| 3T imaging parameters |
At 3T the T1 time is longer (so the TR should also be longer) and the T2 time is shorter (TE can be shorter). However, when we got a 3T machine we tested different TR and TE's and found out that in practice the useful range don't has a big difference from that of a 1.5T MR system.
The contrast looks a bit different - that's normal.
In addition, ask the manufacturer.
There are a lot of other parameters that affect the contrast in 3T.
Hope this will help
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| | View the whole thread | | |
Nancy Dudek
Fri. 26 Aug.05,
00:25
[Start of:
'3T imaging parameters'
2 Replies]
Category:
Sequences and Imaging Parameters
|
| 3T imaging parameters |
Hi
Am looking for the ranges of acceptable TR and TE's for standard spin echo and gradient echo sequences on a 3T.
Does anyone know these or tell me where I can find this info?
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MengChe LOOI
Sat. 13 Nov.04,
03:48
[Reply (1 of 2) to:
'Temperature Monitoring'
started by: 'Schmidt Marga'
on Sun. 6 Jun.04]
Category:
Equipment
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| Temperature Monitoring |
The ideal solution for temperature monitoring during MRI is by using a fibre optic temperature monitoring system.
Fibre optic has inherent distinctive advantages as they are intrinsically safe, 100% immunity to EMI and RFI hence, the temperature reading is reliable.
They are a few manufacturers for this type of system with varying price range but one thing to note is to find out if the system is suitable for human physiological use. Most systems have not gained FDA or other regulations approvals for clinical use.
System and sensor accuracy, repeatability and packaging are also important factors to keep note of.
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Susan Angelico
Tue. 26 Oct.04,
00:24
[Reply (1 of 6) to:
'Brain Protocol'
started by: 'Oscar Cidri'
on Tue. 7 Sep.04]
Category:
Protocols
|
| Brain Protocol |
Hi Oscar,
depending of the indication (tumor, stroke, haemorrhage, epilepsy, inflammation, malformation....) different sequences are useful for brain MRI.
A protocol for a wide range of indications: sagittal T2, coronal Flair, transversal DWI and transversal T1 without and with contrast medium. In case of a result a second plane of a T1 sequence after contrast e.g. coronal is recommended.
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