SpinozaWiki:Quality Control Weekly results
From SpinozaWiki
From February 2014 onwards, a selection of the results from the weekly QC will be published here. For more detailed results, send Tinka an email.
snfr Agar_3mm; rdc Agar_3mm; drift Agar 3mm
sn 32 channel, red=channel 1-16, blue=channel 17-32 (-24)
Weeks of September 30th to October 3rd No qpi values have been measured above 10. No qpi value has been measured above 50. All tests were within specs.
Weeks of September 24th September 30th 26 qpi values have been measured between 1 and 10. One qpi value has been measured between 10 and 50. In this weeks 185 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. All other tests were within specs.
Weeks of September 16th to September 24th 47 qpi values have been measured between 1 and 10. In this weeks 317 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. All other tests were within specs.
Weeks of September 11th to September 16th 13 qpi values have been measured between 1 and 10. In this weeks 225 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. All other tests were within specs.
Weeks of August 19th to September 11th 114 qpi values have been measured between 1 and 10; 1 qpi value has been measured between 10 and 50. In these weeks 1377 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. All other tests were within specs.
Week of August 10th to August 19th 38 qpi values have been measured between 1 and 10. In this week 472 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. All other tests were within specs.
Week of July 29th to August 5th 49 qpi values have been measured between 1 and 10. In this week 490 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. All other tests were within specs.
Week of July 22nd to July 29th 36 qpi values have been measured between 1 and 10. In this week 545 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. All other tests were within specs.
Week of July 15th to July 22nd 32 qpi values have been measured between 1 and 10. In this week 435 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. All other tests were within specs.
Week of July 8th to July 15th 23 qpi values have been measured between 1 and 10. In this week 623 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. All other tests were within specs.
Week of July 1st to July 8th 15 qpi values have been measured between 1 and 10. One qpi values have been measured between 10 and 50. In this week 519 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. All other tests were within specs.
Week of June 24th to July 1st 20 qpi values have been measured between 1 and 10. In this week 497 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. All other tests were within specs.
Week of June 17th to June 24th 13 qpi values have been measured between 1 and 10. In this week 364 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. All other tests were within specs.
Week of June 10th to June 17th 31 qpi values have been measured between 1 and 10. Two qpi value has been measured between 10 and 50. In this week 407 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. All other tests were within specs.
Week of June 3rd to June 10th 28 qpi values have been measured between 1 and 10. One qpi value has been measured between 10 and 50. In this week 595 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. All other tests were within specs.
Week of May 27th to June 3rd 24 qpi values have been measured between 1 and 10. In this week 771 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. All other tests were within specs.
Week of May 20th to May 27th 12 qpi values have been measured between 1 and 10. In this week 594 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. All other tests were within specs. The helium lvl was measured at 49% again, however I will no longer report this until the level changes again. As mentioned before the helium level will go down slowly over time.
Week of May 13th to May 20th 10 qpi values have been measured between 1 and 10. In this week 653 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. The helium level was measured at 49% instead of 50%. All other tests were within specs.
Week of May 6th to May 13th 26 qpi values have been measured between 1 and 10. In this week 872 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. The helium level was measured at 49% instead of 50%. The humidity in the exam room was measured below specs occasionally. All other tests were within specs.
Week of April 29th to May 6th 15 qpi values have been measured between 1 and 10. In this week 625 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. The helium level was measured at 49% instead of 50%. All other tests were within specs.
Week of April 22nd to April 29th 10 qpi values have been measured between 1 and 10. 1 qpi values has been emasured between 10 and 50. In this week 866 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. The helium level was measured at 49% instead of 50%. All other tests were within specs.
Week of April 15th to April 22nd 15 qpi values have been measured between 1 and 10. In this week 823 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. The helium level was measured at 49% instead of 50%. All other tests were within specs.
Week of April 8th to April 15th 6 qpi values have been measured between 1 and 10. In this week 745 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. The helium level was measured at 49% instead of 50%. All other tests were within specs.
Week of April 1st to April 8th 8 qpi values have been measured between 1 and 10. In this week 1082qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. The helium level was measured at 49% instead of 50%. All other tests were within specs.
Extra check-up 04-04-2012 The headcoil that was installed on 18th of March malfunctioned today. Therefore a new headcoil was delivered in the evening. A couple of tests were run to check the functioning of the new head coil. The signal to noise ratio of the 32 channels was higher than ever. The 3mm Agar results were comparable with previous weeks.
Week of March 25th to April 1st 12 qpi values have been measured between 1 and 10. In this week 868 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. The helium level was measured at 49% instead of 50%. The humidity and temperature in the tech room and exam room have occasionally been a bit below specs. All other tests were within specs.
Week of March 18th to March 25th 4 qpi values have been measured between 1 and 10. In this week 835 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. The helium level was measured at 49% instead of 50%. All other tests were within specs. Due to the NX server being very slow today, the plots will be updated later this week.
Week of March 11th to March 18th 4 qpi values have been measured between 1 and 10. In this week 912 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. The helium level was measured at 49% instead of 50%. All other tests were within specs. This week a new headcoil was installed. I compared the rdc, drift, snfr of the 3mm Agar of the old and new coil and I compared the 32 channels. The values of the new coil compared to the old one are comparable to better.
32-channel test
The measurements of the new 32-channel headcoil are higher than the mean of previous measurements and higher than the old coil measurement. Some measurements of the individual channels are near the old coil and previous measurements, while others are better. Channel 9 is one of the channels that has been decreasing over the weeks and has sometimes been found to be lower than specs, the new coil did much better on this channel.
The mean (standard deviation) of the means of the signal-to-noise ratio of the 32 channels (N=29) is 113.63 (4.04). The mean signal-to-noise ratio of the old coil measured this quality control is 112.38. This is .31 std dev lower than the mean. The mean signal-to-noise ratio of the new coil measured this quality control is 120.04. This is 1.59 std dev higher than the mean and 1.90 higher than the old coil.
The mean (standard deviation) of the signal-to-noise ratio of channel 9 (N=29) is 83.56 (4.31). The mean signal-to-noise ratio of channel 9 of the old coil measured this quality control is 83.77. This is .05 std dev higher than the mean. The mean signal-to-noise ratio of channel 9 of the new coil measured this quality control is 96.88. This is 3.09 std dev higher than the mean and 3.04 higher than the old coil.
Agar 3mm
The Agar 3mm measurements of the new coil are lower than the mean values (N=33) and lower than the values of the old coil. However the values are well within range. Also the previous values have not been decreasing.
The mean (standard deviation) signal-to-noise ratio of the 3mm Agar of the measurement before this quality control is605.96 (87.95). The signal-to-noise ratio of the old coil measured this quality control is 607.09. This is .01 std dev higher than the mean. The signal-to-noise ratio of the new coil measured this quality control is 575.31. This is .35 std dev lower than the mean and .36 lower than the old coil.
The mean (standard deviation) rdc of the 3mm Agar of the measurement before last quality control are 2.42 (.25). The rdc of the old coil measured this quality control is 2.79. This is 1.50 std dev higher than the mean. The rdc of the new coil measured this quality control is 2.45. This is .12 std dev lower than the mean and 1.39 lower than the old coil.
The mean (standard error) drift of the 3mm Agar of the measurement before last quality control are -1.47*10^-4 (7.25*10^-5) The drift of the old coil measured this quality control is .002. This is .94 std dev higher than the mean. The drift of the new coil measured this quality control is .002. This is .81 std dev lower than the mean and 1.75 lower than the old coil.
Week of March 4th to March 11th 2 qpi values have been measured between 1 and 10. In this week 783 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. The signal-to-noise ratio of channel 9 has been measured a little bit below normal specifications. The helium level was measured at 49% instead of 50%. All other tests were within specs.
Week of February 26th to March 4th 20 qpi values have been measured between 1 and 10. In this week 790 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. The signal-to-noise ratio of channel 9 has been measured a little bit below normal specifications. The helium level was measured at 49% instead of 50%. All other tests were within specs. The scanner has been recalibrated this week. The beamer has been replaced this week.
Week of February 19th to February 26th 13 qpi values have been measured between 1 and 10. In this week 770 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. All other tests were within specs. From this week I'll be checking the temperature and humidity of the scanroom and the control room.
Week of February 12th to February 19th 3 qpi values have been measured between 1 and 10. In this week 769 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. All other tests were within specs.
Week of February 5th to February 12th 5 qpi values have been measured between 1 and 10. In this week 721 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. All other tests were within specs.
Week of January 22nd to February 5th 2 qpi values have been measured between 1 and 10. In this week 776 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. The signal-to-noise ratio of channel 9 has been measured a little bit below normal specifications. The helium level was measured at 49% instead of 50%, this is no problem. The stimulus computer has no audio output, this will be dealt with as soon as possible. A temporary solution is to boot the computer in eyetracker mode, because apparently then audio works fine. All other tests were within specs.
Week of January 22nd to 29th 14 qpi values have been measured between 1 and 10. In this week 720 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. The signal-to-noise ratio of channel 9 has been measured a little bit below normal specifications. After redoing the 32 channel check, channel 9 was within specs again. All other tests were within specs.
Week of January 15th to 22nd 25 qpi values have been measured between 1 and 10. One qpi value has been measured between 10 and 50. In this week 658 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. All other tests were within specs.
Week 8 januari to 15 januari One qpi value has been measured between 1 and 10. In this week 684 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. All other tests were within specs.
Weeks 24 december to 8 januari One qpi value has been measured between 1 and 10. In these two weeks 736 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. The signal-to-noise ratio of channel 9 has been measured a little bit below normal specifications, this will be looked in to. After redoing the 32 channel check, channel 9 was within specs again. All other tests were within specs. This week there were some heating problems in the Spinoza Center including the scanning room, which made scanning impossible. The problem seems to be fixed, the temperature is normal again.
Week 18 december to 24 december One qpi value has been measured between 1 and 10. In this week 490 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. All other tests were within specs.
Week 11 december to 18 december One qpi value has been measured between 1 and 10. In this week 505 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. All other tests were within specs. The helium level was measured at 50% again.
Week 4 december to 11 december No qpi values have been measured above 1. In this week 615 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. All other tests were within specs. For the first time a helium level of 49% instead of 50% was measured. A second measurement of the helium level showed 50% again. The helium level is expected to drop over time.
Week 27 november to 4 december No qpi values have been measured above 1. In this week 377 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. All other tests were within specs. The left headphone seems to work improperly for some not-high quality audio files, especially for low tones.
Week 20 november to 27 november No qpi values have been measured above 1. In this week 250 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. All other tests were within specs.
Weeks 6 november to 20 november Two qpi value have been measured between 1 and 10. No qpi values have been measured above 10. In these two weeks week 829 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. All other tests were within specs. A new folder was added in the Quality Control folder on bigbrother fMRIprojects regarding additional information. From time to time new files will be added with information on something that was noticed but unclear during quality control. I added a short text on 'unwanted program policy' of the McAfee virusscanner.
Week 29 oktober to 6 november Six qpi value have been measured between 1 and 10. No qpi values have been measured above 10. In this week 686 qpi values have been measured. One scan, despite the number of dynamics, gives one qpi value. All other tests were within specs. The batteries which ran empty quickly last week have worked fine this week.
Week 23 to 29 oktober Two qpi value have been measured between 1 and 10. No qpi values have been measured above 10. All other tests were within specs. Two batteries ran empty very quick, attention will be payed to this, perhaps new batteries will be ordered soon.
Week 17 to 23 oktober Two qpi value has been measured between 1 and 10. No qpi values have been measured above 10. All other tests were within specs. Beamer gave a first warning that the light needs to be replaced. The beamer works fine, a new light will be placed soon.
Week 9 to 16 oktober Ten qpi value has been measured between 1 and 10. No qpi values have been measured above 10. All other tests were within specs.
15 october Monthly calibration of system.
Week 2 to 9 oktober One qpi value has been measured between 1 and 10. No qpi values have been measured above 10. All other tests were within specs.
week 25 september to 2 oktober Two qpi values were measured between 1 and 10. No qpi values were measured above 10. In comparison to previous weeks we will now only present the amount of qpi deviations (instead of the values) between 1 and 10, 10 and 50, 50 and 200. And only present the specific values when over 200. Because small values bear no problems and are therefore uninformative, however the number of deviations do bear information. Values above 200 might bear problems in the form of artefacts and are therefore presented. All other tests were within specifications.
28 september The DWI phantom has arrived. This makes it possible to improve DWI sequences with a quantitative evaluation (vs eyeballing) and to implement a quantitative quality control for the DWI sequences. Implementation will be over the next couple of weeks.
weeks 11 september to 25 september Seven minder QPI deviations (2.509; 1.801; 19.423; 1.204; 1.252; 3.247; 1.670) have been measured. All other tests were within specifications.
22 september Replacement of CDAS panel and Multi-transmit panel.
15 september Quarterly periodic maintenance. The system passed the extended testing protocol of Philips. However, one of the boards of the CDAS will be replaced in the coming weeks from a prospective maintenance perspective.
13 september The system has been re-calibrated. This solves the eddy current artifacts observed in some of the DWI scans in the last weeks of august. We will now re-calibrate the system on a monthly basis the prevent these types of problems in the future. The Sense 3 DWI scans still show some eddy current distortions. Inspection of old data revealed that this has always been the case and is a limitation of the system itself.
Week 4 to 11 september Two very minor QPI deviations have been measured (1.055; 1.013). All other tests were within specifications.
28 of August to 4 of September Three minor QPI deviations (10.705; 1.666; 1.057) have been measured. All other test were within specifications. The SNR values of all channels in the headcoil were good. It seems that last week was probably a small deviation within normal range. The meeting with technical personal from Philips has been postponed for a week.
22 to 28 of August Seven minor QPI deviations (6.162; 2.236; 2.136; 3.099; 1.560; 1.631; 3.632) have been measured. 4 of the 32 channels in the headcoil showed a minor drop in signal to noise ratio, however we didn't find any qualitative artefacts. During last week we found some artefacts in DTI scans.
Weeks 7 to 21 of August Five minor QPI deviations (1.521; 1.087; 2.112; 1.577; 1.854) have been measured. All other tests were within specifications.
Week 31 of July to 6 of August One QPI deviations of 0.697 was measured. All other tests were withing specifications. The batteries for the eyetracker have arrived. They will be installed permanently into the setup during the month of august. QPI values will again be monitored on a weekly basis (vs. a daily basis).
Week 24 to 30 of july During 1 measurement QPI deviations were measured. The values were around 2. No further measures are taken at this time but QPI values will be tracked on a daily basis. A new 32-channel headcoil has arrived and the sensors have been tested and were within specifications. All other tests were within specifications.
Week 17 to 23 of july During 3 measurements QPI deviations were measured. During the most extreme sessions the values were around 20. All QPI deviations were present during eyetrack recordings. The wire feeding the eyetracker with electricity is not MRI compatible and we decided to order MRI batteries for this device. No further measures are taken at this time but QPI values will be tracked on a daily basis. All other tests were within specifications.