|
Magnetic
Resonance -
Technology
Information
Portal |
Welcome to MRI Technology • |
|
|
 | Info
Sheets |
| | | | | | | | | | | | | | | | | | | | | | | | |
 | Out-
side |
| | | | |
|
| | | | | |
| Result: Searchterm 'Image Quality'
found in 14 messages |
| Result Pages: 1 [2] 3 |
More Results:  Database (42) News Service (17) Resources (5) |
|
|
Brent Johnson
Wed. 21 Aug.13,
19:38
[Start of:
'Hitachi Airis II question'
0 Reply]
 Category:
Sequences and Imaging Parameters
|
| Hitachi Airis II question |
I have a question for a Hitachi Airis II .3T non-upgraded gradients
On T2 FSE sequences especially on thumb sagittal slices. Image quality very poor, grainy. What is ideal bandwidth and TE settings for improving image quality? Also is positioning and angle of slice a factor in image quality. The closer the anatomy is to edge of coil, does that effect image quality.
Thanks Brent
|
| |  Reply to this thread
(login or register first) | |
Steven Ford
Mon. 7 Mar.11,
16:07
[Reply (6 of 8) to:
'6-1.5T MAGNETS, DIFFERING GRADIENTS'
started by: 'Elise Gough'
on Wed. 23 Feb.11]
Category:
Applications and Examinations
|
| 6-1.5T MAGNETS, DIFFERING GRADIENTS |
We maintain a lot of magnets. The leading cause of image quality problems is applications related. Nobody can possibly know all the nuances of pulse sequences by various vendors, software levels, etc. I've heard many times that a certain machine is no good, when in fact the sequences are inefficiently set up. Look there first.
Usually the techs welcome good training. If they don't want to be trained, then you have a problem, but it sounds like this issue is caused by other factors.
If there are differences in baseline quality between the machines, then compensate for that by other means. Signal starvation is easily remedied; keep the quality as consistent as you can and let time be the variable, if it comes down to that.
|
| | View the whole thread | | |
Elise Gough
Fri. 4 Mar.11,
13:56
[Reply (2 of 8) to:
'6-1.5T MAGNETS, DIFFERING GRADIENTS'
started by: 'Elise Gough'
on Wed. 23 Feb.11]
Category:
Applications and Examinations
|
| 6-1.5T MAGNETS, DIFFERING GRADIENTS |
Thank you for your response. Our group is strict about FOV, thickness/gap parameters being the same across all magnets. One magnet has slew rate of 77, FRFSE T2, TE 85,TR 3500 Classic Fat supressed images which are pristine, vs magnets of 120 slew rate same parameters look signal starved. So gradient strength makes a speed difference, not an image quality difference?
Elise Gough RT(R)(CT)(MR)
|
| | View the whole thread | | |
Angela Hoskinson
Thu. 22 Jan.09,
03:19
[Start of:
'Gradient modes'
1 Reply]
Category:
Applications and Examinations
|
| Gradient modes |
Does changing the gradient mode from "fast" to "whisper" have an effect on the image quality? I just did a PD FS on a knee and compared two sequences that were exactly the same except for one was "fast" and the other was "whisper", which also changed the TR and TE very slightly (TR from 1970 - 2100 and TE from 29 - 31). The whisper sequence was noticeably lower quality and I can't figure out why.
|
| | View the whole thread | Reply to this thread
(login or register first) | |
Reader Mail
Mon. 14 Jan.08,
22:49
[Reply (2 of 4) to:
'Mechanical Ventilator outside of Scan room'
started by: 'Dan Barrieau'
on Wed. 20 Jun.07]
Category:
Site Planning and Specifications
|
| Mechanical Ventilator outside of Scan room |
Just to add to that. The rooms are lined with copper mesh so that Radio Frequency (RF) outside the room will not affect the image quality (and vise versa so your monitors won't freak out). The tubes through the wall are long enough to absorb and basically prevent any RF from getting in or out. The place in question probably couldn't justify the money to buy an MR safe vent. And I can't think of any pump that would be safe inside the room; although, some sites will chance taking pumps in and keeping them at a distance from the magnetic field.
|
| | View the whole thread | |
| |
| | Result Pages : 1 [2] 3 | |
|
| |
 | Look
Ups |
| |
|
MR-TIP.com uses cookies! By browsing MR-TIP.com, you agree to our use of cookies. | | | [last update: 2024-02-26 03:41:00] |
|
|
bottom
top
