Physiology: Difference between revisions
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7. Your physiology data will be automatically exported with Flywheel. If you want to manually export your physiology data you can do this from G:/log/physlog or use the gtPacknGo software. | 7. Your physiology data will be automatically exported with Flywheel. If you want to manually export your physiology data you can do this from G:/log/physlog or use the gtPacknGo software. | ||
Note: For those of you who use the Philips MR Physiology recording system to measure and analyze VCG and respiratory signals, it is good to know that MR scanners with wireless VCG devices have a different sampling frequency than older wired systems. The sampling frequency of current Philips 3T systems is *496.03Hz*. The frequency of the older wired systems was 500Hz. In most cases this difference is negligible within fMRI trials, but the time difference can vary significantly over longer periods of time. | |||
The following scripts can be helpful when dealing with physlog files: | |||
Matlab: https://nl.mathworks.com/matlabcentral/fileexchange/42100-readphilipsscanphyslog-filename-channels-skipprep | |||
Python: https://community.mr-paradise.com/t/physlog-file-reader-in-python/3192 | |||
Revision as of 16:13, 30 July 2020
1. Take 2 batteries from the battery charger and put them in both the PPU (3) and VCG (4) unit, even if you only use PPU. You may leave the VCG unit in the closet if you don’t use it.
2. Place the respiratory sensor (1) horizontally +/- 5 cm above the navel of your subject and secure it with the Velcro band.
3. Put the finger clip (2) on the left ring finger. Put the side with the light on the opposite side of the finger nail.
4. In the control room, press the right mouse button on the bottom left side of the screen when you are in the application software and choose PPU + Resp to show the measurements on the bottom left.
5. The measurements are also shown on the little screen on the scanner.
6. To remove the battery from the unit, first push the battery handles on the sides before you pull out the battery. The batteries last +/- 1 hour, so preferably change them for every participant and always put the used ones in the charger immediately. Put all batteries back in the charger when you are finished scanning.
7. Your physiology data will be automatically exported with Flywheel. If you want to manually export your physiology data you can do this from G:/log/physlog or use the gtPacknGo software.
Note: For those of you who use the Philips MR Physiology recording system to measure and analyze VCG and respiratory signals, it is good to know that MR scanners with wireless VCG devices have a different sampling frequency than older wired systems. The sampling frequency of current Philips 3T systems is *496.03Hz*. The frequency of the older wired systems was 500Hz. In most cases this difference is negligible within fMRI trials, but the time difference can vary significantly over longer periods of time.
The following scripts can be helpful when dealing with physlog files: Matlab: https://nl.mathworks.com/matlabcentral/fileexchange/42100-readphilipsscanphyslog-filename-channels-skipprep Python: https://community.mr-paradise.com/t/physlog-file-reader-in-python/3192