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| Result: Searchterm 'Tesla'
found in 13 messages |
| Result Pages: [1] 2 3 |
More Results:  Database (40) News Service (56) Resources (12) |
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Schwarz Arni
Sun. 18 Aug.13,
17:11
[Start of:
'Size of B1'
0 Reply]
 Category:
Basics and Physics
|
| Size of B1 |
Hello!
How many Tesla does B1 (the HF pulse) have more or less? What range is applicable? I cannot find information about that anywhere.
Thanks!
Arni
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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
|
| 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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Aminullah Khan
Wed. 10 Feb.10,
09:14
[Start of:
'Hear MRI'
0 Reply]
Category:
Applications and Examinations
|
| Hear MRI |
can any one tell me that how can i do heat MRI with 0.2 tesla MRI
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Philip Lledo
Thu. 22 Oct.09,
08:15
[Start of:
'MRI Techologist'
0 Reply]
Category:
Jobs
|
| MRI Techologist |
Sir, Presently me working is Saudi Arabia under the Sponsor Ministry of Heath. I have 7 years experiece in the field of my expertise. I handled different types of machine, such as: Siemens Vision 1.5 Tesla Close MRI, Siemens Corcerto 0.2 Tesla Open MRI, Hitachi Aperto 0.4 Tesla Open MRI and Philips Achieva 1.5 Tesla Close MRI. Im holding a two license one from the Philippine Professional Regulation Commission and the other is from Saudi Council for Health Specialties. At the same time,i have been processing my registration for Heath professional Council (HPC)to be credited in the United Kingdom, London.
Many Thanks,
Philip C. Lledo
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palani arakkan
Wed. 1 Jul.09,
14:22
[Reply (9 of 26) to:
'MRI Technologists Jobs in Saudi Arabia'
started by: 'Mosta Mosta'
on Tue. 3 Mar.09]
Category:
Jobs
|
| MRI Technologists Jobs in Saudi Arabia |
Respected sir,
iam sam palani radiographer working in international hospital of bahrain. iam looking for the post of radiographer. handled 0.5 ge signa contour,siemens 1.5 symphony machines and experience in philips 1.5 tesla mri achieva assigned to do all kinds of special CE mr angiograms like renal,peripheral,upper limb angiogram and fetal,breast,mru,mrcp, ect
thank you your's faithfully
A.sam Palani
e.mail.sam_palanirs@yahoo.co.in
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