7T general info & troubleshooting: Difference between revisions
From SpinozaWiki
No edit summary |
|||
Line 33: | Line 33: | ||
* Export raw data: | * Export raw data: | ||
** System --> Research --> Delayed reconstruction. Select exam, type number of exam. Click Prev Scans. Type 2. Click Raw Export. Now type number of your series. Click Proceed. Type a number to save your series. Type Enter/Proceed a few times. Now the scan is added to the scan list. You can add more series to reconstruct or continue, by clicking Start Scan and click Proceed. When finished click Exit to release this scan to the scanner database again. | ** System --> Research --> Delayed reconstruction. Select exam, type number of exam. Click Prev Scans. Type 2. Click Raw Export. Now type number of your series. Click Proceed. Type a number to save your series. Type Enter/Proceed a few times. Now the scan is added to the scan list. You can add more series to reconstruct or continue, by clicking Start Scan and click Proceed. When finished click Exit to release this scan to the scanner database again. | ||
** use gt pack 'n go utility | ** use gt pack 'n go utility. This requires ReconFrame (which we don't have yet) and licensed matlab software to reconstruct raw data. | ||
* Location shim parameters: '''E:\Export\PRIDE\shimtool\linear_shim.txt''' | * Location shim parameters: '''E:\Export\PRIDE\shimtool\linear_shim.txt''' | ||
* Manually selecting coil elements: | * Manually selecting coil elements: |
Revision as of 17:42, 29 October 2015
General safety aspects
- differences with 3T
Table operation
Er zijn diverse opties om te proberen het bed weer te activeren. Het beste is om die in deze volgorde te proberen:
- Stop/reset op handel uiteinde bed.
- Trek bed handmatig helemaal naar achteren. Dan 2 keer een 3 vingers reset op handel uiteinde bed. (duurt ca 2 minuten per keer)
- Undock bed manual door schakelaar op de grond naast de magneet omhoog te zetten. (undock) Daarna bed naar achteren trekken en op de rem zetten. Vervolgens schakelaar in onderste stand stand (dock) zetten. Let op want connector komt naar buiten in docking station!! Schakelaar in midden zetten (ready to dock) Connector gaat weer naar binnen. Tenslotte bed weer aansluiten. (duurt ook weer ca 2 minuten)
- CDAS reset (zie elders op deze wiki)
Als de tafel piept, is de bedpositie kwijt (ws veroorzaakt door resetten in verkeerde bedpositie). Druk op stop. Bed handmatig naar buiten schuiven. Reset. 2x 3-vinger reset.
!!!!!! Belangrijk!!!!! Bij al het resetten en aan/uit zetten, moet het tafelblad zover mogelijk naar achteren worden gezet.
Als er niets lukt is er nog de mogelijkheid om handmatig het blad naar binnen te duwen. Voorwaarde is dat de tafel wel gedocked is (connector aangesloten op het bed) en het blad los staat. Dat kan door op de stopknop te drukken. De rode lampen op de bekapping gaan aan en het blad kan dan vrij bewegen. Om hem naar binnen te schuiven moet je de beveiliging even omzetten door vooraan onder het bed Het handeltje even vast te houden tijdens het naar binnen duwen van het bed. Dit handmatig naar binnen duwen is uiteraard niet wenselijk en zwaar werk. Probeer niet al te snel te duwen, vooral als er een patient op ligt.
In alle gevallen graag Anton of mij bellen en als het mogelijk is willen we graag weten wat er gescand werd voordat het bed stopte. (protocol en tijd)
Useful commands at console
(might move to separate page accessible to all users)
- stop/start all processes (NB including data transfer!):
- permproc stop|start all stop|start all processes
- c:\nmr\gyroscan\commands\activate_configuration.pl. type y, Enter.
- start_stop_procs.pl stop also stops background processes. Needed in case of hardware reset in service room.
- Communication with PRIDE (e.g. for image-based shimming): PrideXS_XML. In case of error Access denied, no SW key pressed, kill process pridexsproc_win_cs.exe in Task Manager.
- Export raw data:
- System --> Research --> Delayed reconstruction. Select exam, type number of exam. Click Prev Scans. Type 2. Click Raw Export. Now type number of your series. Click Proceed. Type a number to save your series. Type Enter/Proceed a few times. Now the scan is added to the scan list. You can add more series to reconstruct or continue, by clicking Start Scan and click Proceed. When finished click Exit to release this scan to the scanner database again.
- use gt pack 'n go utility. This requires ReconFrame (which we don't have yet) and licensed matlab software to reconstruct raw data.
- Location shim parameters: E:\Export\PRIDE\shimtool\linear_shim.txt
- Manually selecting coil elements:
- Control Parameter Editor - Scan (approx 1/3, 6x clicking):
- User def. channel selection - yes
- at initial, Xmit Coil selection. choose 0.
- Dual coil - No. (2e surface coil off, independent selection per surface coil not possible)
- Direct protocol comparison (useful while we still run on R3)
- Export exam card with the protocols you want to compare.
- Do this:
Delayed Reconstruction,
User def element selection: yes
selecteer elementen: waarde 1
Changed default settings
- Control parameter Reconstruction: Noise clip factor 1,2,3: 0.001. Avoids noise clipping of phase to -pi in case the SNR is too low.
- Increased maximum average power to 20: max_avg_pow: 20 in mpgcoil_mtx_tr.i, add file to patch folder to apply.
Power off and power on sequence(s)
CDAS
- Reset CDAS: turn off green switch. Wait 5 seconds.
- Turn red switch.
- Unplug sense-cable (on top, labeled with red arrow). Wait 5 seconds.
- Turn on in reverse order: red switch and green switch.
- Wait for bed-lights (top) to turn green. Now plug in the sense-cable (red arrow). This controls bore light.
- At bed console, set light to 50%.
Main System
- Power off sequence: 1. scan computer. 2. CDAS. 3 Power gradient (right) and System (left), see Leiden document (original in scstaff)
- Power on sequence: in reverse order
Compressors
Procedure testing/resetting compressors Helium pump: 2 small cubic devices in the far right corner. The green light on the left device should be flashing. Check messages on small LED-displays: scroll with arrow up/down buttons. Should all be OK, not ERR. Temperature of tubes should be below room temperature (i.e. cold). To reset: press OFF. You should hear it switching off. Wait, and press ON, again hearing it switching on. To hard reset: Press OFF. Wait. Turn small black switch from I to O. Wait. Turn back to I. Wait. Important: press ON to turn the compressor back on.
(Common) malfunctions and fixes
No trigger
- Check if sync box on console pc has power (right LED green)
- Unplug/replug power.
- table
- coldhead compressors
- gradient amplifiers
No power in bed, won't dock, no 'air puffs'
- Probably no air pressure
- Check meters in cabinet at the back of CDAS (remove panel using imbus size 5)
- Pressure meters should look approx. like this: [picture to be uploaded]
Patient ventilation system
Box hanging the CDAS rack. Turn off by unplugging 220V cable.
Defect in shim gradients
Irregular 'cracking noise' in scanner room. Originates from shim rack.
Philips contacts (?)
Cor Romijn Anton ? Merel ?
AMC Contacts
During office hours, contact front office on phone number 88, option 2 Regelkamer: 62900 (outside office hours) Ed de Klerk: 06-30005770 Tom Emke: 020-5662305, 06-22452389 Roelofsen: 68103