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| Result: Searchterm 'signal'
found in 52 messages |
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More Results:  Database (369) News Service (50) Resources (8) |
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marc jupin
Thu. 26 Mar.15,
09:03
[Start of:
'receiver gain in siemens trio'
0 Reply]
 Category:
Sequences and Imaging Parameters
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| receiver gain in siemens trio |
Hi, we measured a phantom with two receiver gain option: LOW and HIGH (available from parameters).
We would like to calculate the difference in signal intensity, but unfortunately the rda files headers do not contain any information about the receiver gain value.
Does anyone have a clue how I could find the receiver gain value?
Thanks.
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May Shoemaker
Fri. 6 Feb.15,
02:40
[Start of:
'MRI questions'
0 Reply]
Category:
General
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| MRI questions |
I had MRI of the femur and pelvis. Can you explain abnormal findings:
"Marrow signal abnormality in the metaphysis and diaphysis of both femora without lesion. Possible red marrow conversion".
Specifics of MRI show:
MRI shows patchy low T1 and high T2 marrow signal in meta and diaphysis in both femur. At mid diaphyseal level, curvilinear bright T2 and STIR signal noted in the intramedullary cavity. No lesion noticed.
Thanks for any insight. Is there another website I could use for more information?
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Rena Miller
Fri. 15 Aug.14,
07:16
[Reply (1 of 2) to:
'door alarm/ MRI pauses if door opens'
started by: 'Samuel Strode'
on Thu. 7 Aug.14]
Category:
Devices, Scanner, Machines
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| door alarm/ MRI pauses if door opens |
MRIs are enclosed by a Faraday cage to shield the MRI scanner against incoming radio waves which would disturb the sent and received signals. The reception or transmission of radio waves is heavily attenuated or blocked by the cage, which is usually integrated in the walls of the scanning room. The closed RF door completes the cage preventing RFI/EMI leakage, absorbs also much of the acoustic noise and prevents unauthorized persons to enter the room. Usually, all or the unreconstructed part of information is lost if the scan is stopped by door opening. Some MRI systems allow to pause the scan (at the keyboard, not by door opening) and to continue scanning while not loosing data.
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Belinda Williams
Mon. 21 Jul.14,
21:44
[Start of:
'?'
1 Reply]
Category:
Coils
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| ? |
I work on GE excite open speed. On lumbar spine t2 axials, it appears like the coil looses signal and makes image dark and grainy. The coil gives good signal on the other sequences and tests good when engineer has tested it. The sag t2 is bright like it should but ax is dark. Any ideas why?
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shruti soni
Wed. 27 Feb.13,
00:25
[Start of:
'STIR and l-spine'
1 Reply]
Category:
Sequences and Imaging Parameters
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| STIR and l-spine |
we have got new spine coil for our 1.5 T philips achieva scanner. App came in and added new software and protocoal for that. when we run STIR sequence for l- spine with regular size patient, it comes out nice. However, with hypersthenic patient, it comes out very dark, suppressing signal from bone,fat and only shows csf in cord. could it be that TI not optimal for hypersthenic patient?
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