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| Result: Searchterm 'tr'
found in 420 messages |
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Tanya Vi
Sat. 18 Feb.12,
15:33
[Reply (1 of 2) to:
'Looking to Become Licensed/Credentialed'
started by: 'Jack McIntire'
on Tue. 1 Nov.11]
 Category:
Reimbursements and Costs
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| Looking to Become Licensed/Credentialed |
Hello to everyone,
I would like to ask what is the best way for foreign Radiology Technologist to work in USA? I am interested in MRI field and I am currently work on MRI,CT,Mammography and X-ray in private clinic in Bulgaria. I have obtained Bachelor Degree in 2004 with tree years training course.
My question is what I have to do if I want to work in USA?
Is anybody who has an experience with that?
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|  View the whole thread | | |
Steven Ford
Tue. 31 Jan.12,
08:19
[Reply (1 of 2) to:
'RF shimming'
started by: 'Reader Mail'
on Thu. 1 Oct.09]
Category:
Basics and Physics
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| RF shimming |
For Magnetic fields, the overall field is adjusted to push it up a little bit in one spot and push it down a little bit in another area. The goal is to create a field that's perfectly homogenous.
The RF field created by the transmit coil likewise must be as homogenous as possible, so that the flip angle is constant throughout the imaging volume. In the past, designers have solved this problem by building coils such as the 'birdcage' style that would create a very even amount of energy inside. This is one reason why the transmit coils tend to be large.
With the advent of 3 Tesla and stronger magnets, the RF resonant frequency also rises. RF energy absorbed in the patient rises with the higher frequencies also, and another problem raises its head: it's a lot harder to make a very homogenous RF field. Even if you are scanning phantoms, the inside tends to be subject to different energy than the edges.
But in the human body, there are all sorts of irregular lumps and bumps that absorb RF differently, further complicating matters.
Now, on modern scanners it's possible to perform a magnetic field shim with the patient actually in the magnet in order to compensate for minute changes in the magnet from one exam to another. For super-high field magnets, an RF shim is also a handy thing to do.
If you have a Multi element RF transmit coil (regular phased array coils are just for receiving) you can run a program which selectively turns up the power in some elements so that the overall signal received is maximized. That's an RF shim.
Steven Ford
Professional Imaging Services, Inc.
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| | View the whole thread | | |
Reader Mail
Mon. 30 Jan.12,
20:31
[Start of:
'Scan parameters for 1.5T GE HD'
0 Reply]
Category:
Applications and Examinations
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| Scan parameters for 1.5T GE HD |
Looking for a Tricks parameters for 1.5T GE HD.
Trick for Carotids.
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(login or register first) | |
Karen Lesley
Thu. 26 Jan.12,
15:55
[Reply (4 of 7) to:
'Imaging optic neuritis'
started by: 'Karen Lesley'
on Wed. 18 Jan.12]
Category:
General
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| Imaging optic neuritis |
Thanks Anna :-)
I've recommended thin coronal STIR (the "axial" in my original post was a mistake - I do know better, promise!) and FLAIR.
The ON is longstanding, so may not show with gadolinium, but worth a try if the budget will stretch so will add that too.
Thanks again.
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| | View the whole thread | | |
Anna Lena Golay
Wed. 25 Jan.12,
20:59
[Reply (3 of 7) to:
'Imaging optic neuritis'
started by: 'Karen Lesley'
on Wed. 18 Jan.12]
Category:
General
|
| Imaging optic neuritis |
A 2-3 mm STIR sequence through the optic nerves may show the characteristic high-signal intensity of optic neuritis. Gadolinium enhanced T1-weighted fat-saturated (to suppress the bright signal of the orbital fat tissue) images of the orbits show the inflammation of the optic nerve. White matter lesions, which denote a higher risk of developing MS, are typical imaged with FLAIR and T2-weighted images (hyperintense lesions), or show enhancement of T1-weighted images postcontrast.
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