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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

Overview page for 7T related information

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 ?

Emergency procedure (7T specific aspects)