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7T general info & troubleshooting

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Revision as of 15:54, 21 May 2015 by Caan (talk | contribs)

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.

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.

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 sequence: 1. scan computer. 2. CDAS. 3 Power gradient (right) and System (left), see Leiden document (original in scstaff)

Common malfunctions

  • table
  • coldhead compressors
  • gradient amplifiers

Philips contacts (?)

Cor Romijn Anton ? Merel ?

Emergency procedure (7T specific aspects)