7T general info & troubleshooting: Difference between revisions
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* '''start_stop_procs.pl stop''' also stops background processes. Needed in case of hardware reset in service room. | * '''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. | * 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: use gt pack 'n go utility | |||
* Location shim parameters: '''E:\Export\PRIDE\shimtool\linear_shim.txt''' | |||
=== Changed default settings === | === 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. | * 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) === | === Power off and power on sequence(s) === | ||
* Reset CDAS: turn off green switch. Wait 5 seconds. Turn red switch. Wait 5 seconds. Turn on in reverse order. | * Reset CDAS: turn off green switch. Wait 5 seconds. Turn red switch. Wait 5 seconds. Turn on in reverse order. | ||
* Power sequence: 1. scan computer. 2. CDAS. 3 Power gradient (right) and System (left), see [https://www.spinozacentre.nl/wiki2/images/2/25/7T_powersequence_Leiden.pdf Leiden document (original in scstaff)] | * Power off sequence: 1. scan computer. 2. CDAS. 3 Power gradient (right) and System (left), see [https://www.spinozacentre.nl/wiki2/images/2/25/7T_powersequence_Leiden.pdf Leiden document (original in scstaff)] | ||
* Power on sequence: in reverse order | |||
=== Common malfunctions === | === Common malfunctions === | ||
Revision as of 15:58, 21 May 2015
General safety aspects
- differences with 3T
Table operation
Useful commands at console
(might move to separate page accessible to all users)
- permproc stop|start all stop|start all processes (NB including data transfer!).
- 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: use gt pack 'n go utility
- Location shim parameters: E:\Export\PRIDE\shimtool\linear_shim.txt
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)
- Reset CDAS: turn off green switch. Wait 5 seconds. Turn red switch. Wait 5 seconds. Turn on in reverse order.
- 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
Common malfunctions
- table
- coldhead compressors
- gradient amplifiers
Philips contacts (?)
Cor Romijn Anton ? Merel ?