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| Result: Searchterm 'Contrast'
found in 78 messages |
| Result Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 [14] 15 16 |
More Results:  Database (373) News Service (140) Resources (28) |
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Reader Mail
Sun. 19 Feb.06,
14:36
[Start of:
'CE-MRA Vasovist protocol'
1 Reply]
 Category:
Protocols
|
| CE-MRA Vasovist protocol |
We will start soon with Vasovist (MS-325) for peripheral CE-MRA with moving table. Expecting higher resolution due to longer possible scan times - but discussing timing and needed post processing.
Is bolus timing needed - is fluoroscopic triggering possible - for the arterial phase?
Any experiences with this contrast agent, a good scan protocol or some good sources about Vasovist?
Anything appreciated!
Greetings
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syam reddy
Wed. 25 Jan.06,
12:11
[Start of:
'vibe sequences in neuro mri?'
1 Reply]
Category:
Sequences and Imaging Parameters
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| vibe sequences in neuro mri? |
I am trying to cut down on time and have read a few articles that talk about mprage and vibe imaging but I am wondering if I can use them for post contrast imaging instead of t 1 sequence on my brain and spine studies. Anyone have any experience or comments about that?
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GONZALO SOLIS
Tue. 22 Nov.05,
05:35
[Start of:
'usmarine2tim2'
0 Reply]
Category:
Basics and Physics
|
| usmarine2tim2 |
Hello to all my fellow MR Technologists and / or students:
I have a few questions that I would greatly appreciate if someone could help me answer. The dead line is THIS Friday 25th 1000AM morning so please reply STAT
Please e mail me at USMARINE2TIM2@YAHOO.COM
1. . Breath hold duration of less than _________are
recommended when dealing with MR Arenal artery
scan?
a. 30sec
b. 25sec
c. 18sec
d. 8
2. . In renal angiography, what anatomical
landmark does the 3d slab need to cover just
anterior to?
a. Adrenal glands
b. Hepatic vein
c. Portal vein
d. Abdominal aorta
3. .What makes MRI a better choice than DSA for evaluation of a bilateral renal artery stenoses at the orgins of the renal arteries?
a. It is a noisier examination
b. The contrast used is less nephrotoxic than DSA
contrast
c. MRI has higher special resolution than DSA
4. Signal loss will result when further maturation of the clot produces which one of the following?
a. methemoglobin
b. hemosiderin
c. phagocytosis.
d. hemoglobin
5. .For cine gradient echo imaging with true FISP, which of the following statements is TRUE?
a. .images have better image contrast and acquisitions are faster than conventional cine gradient echo imaging
b. cine true FISP images can be performed on any MRI unit
c. to make true FISD images, intravenous gadolinium contrast is needed
d. .true FISP images cannot be used for breath- hold acquisitions because the sequence is too slow
6. Which one of the following statements is NOT
true about phase contrast imaging?
a. .phase contrast imaging is useful for measuring blood flow
b. .phase contrast images are ECG gated
c. .phase contrast images can be performed on most
scanners with cardiac imaging capabilities
d. phase contrast images required
intravenous gadolinium contrast
Thank you so much
Gonzalo RT (R) --future-Ã MR
God Bless
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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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Sue Johanson
Wed. 27 Apr.05,
03:36
[Reply (1 of 4) to:
'Contrast MRA COW.'
started by: 'Marilia White'
on Thu. 3 Mar.05]
Category:
Contrast Agents
|
| Contrast MRA COW. |
Hi,
seems crazy, you should have many undesirable veins! We run a 3D TOF MRA of the circle of willis without contrast with best results (1.5T and 3T).
Contrast enhanced 3D MRA of the carotids are done with machine injection (never with a butterfly!), automated bolus detection and a flow of 3ml/sec and 25 ml Gad. If no bolus detection program is available, look for the delay with a test bolus of 2ml. With a high resolution scan, both carotids and circle of willis are assessable. The use of a set like Smartset for the injection is helpful if no power injector is available.
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