15 May
2012
15 May
'12
1:16 p.m.
The lamp in the projector in MRI failed yesterday and had to be
replaced. Any users who have luminance sensitive paradigms (i.e. who
have calibrated their stimuli for luminance in the past) should consider
repeating these measures and making any necessary changes as the lamp
brightness may now be different.
Thanks,
--
Andre'
************************************************************************
Andre Gouws
York Neuroimaging Centre
The Biocentre
York Science Park
Heslington
YO10 5DG
Tel: +44 (0) 1904 435328
Fax: +44 (0) 1904 435356
15 May
15 May
2:15 p.m.
Further to my previous email, it has been suggested that users may want
to "enter the bulb change into the GLMs even if they don't calibrate" ..
this would attempt to regress out any systematic effect of the bulb
change on your data.
To be clear, any data acquired as of 9am on Monday the 14th of May has
been acquired with a new bulb; data acquired before that was with the
old bulb.
Thanks
On 15/05/12 14:16, Andre Gouws wrote:
The lamp in the projector in MRI failed yesterday and
had to be
replaced. Any users who have luminance sensitive paradigms (i.e. who
have calibrated their stimuli for luminance in the past) should consider
repeating these measures and making any necessary changes as the lamp
brightness may now be different.
Thanks,
--
Andre'
************************************************************************
Andre Gouws
York Neuroimaging Centre
The Biocentre
York Science Park
Heslington
YO10 5DG
Tel: +44 (0) 1904 435328
Fax: +44 (0) 1904 435356
10 Jul
10 Jul
12:20 p.m.
New subject: Further Projector maintenance - fMRI projector changed
Dear users,
Following failure ("stuck" pixels) on one of the LCD chips of the
projector in MRI, the projector has been replaced today at midday.
Recently, blue dots began appearing on 'dark' parts of the screen
suggesting this sort of failure, and following investigation this has
proven to be the case.
In order to have as little impact as possible on current settings and
acquisition protocols, users should note that we have done the following:
1) replaced the previous projector with an exact duplicate from stock
(same make and model)
2) migrated the lamp into the replacement projector
3) ensured that the hardware settings ('brightness', 'contrast' and
'zoom' on the projector are exactly as previous)
4) migrated the optical long-throw lens from the old to replacement
projector.
Reiterating the messages sent before (below), users are encouraged to
recalibrate and/or model for the change in future analyses if they feel
this is appropriate.
Thanks to those who brought the issue to our attention.
Andre'
On 15/05/12 15:15, Andre Gouws wrote:
Further to my previous email, it has been suggested
that users may want
to "enter the bulb change into the GLMs even if they don't calibrate" ..
this would attempt to regress out any systematic effect of the bulb
change on your data.
To be clear, any data acquired as of 9am on Monday the 14th of May has
been acquired with a new bulb; data acquired before that was with the
old bulb.
Thanks
On 15/05/12 14:16, Andre Gouws wrote:
--
Andre'
************************************************************************
Andre Gouws
York Neuroimaging Centre
The Biocentre
York Science Park
Heslington
YO10 5DG
Tel: +44 (0) 1904 435328
Fax: +44 (0) 1904 435356
The lamp in the projector in MRI failed yesterday
and had to be
replaced. Any users who have luminance sensitive paradigms (i.e. who
have calibrated their stimuli for luminance in the past) should consider
repeating these measures and making any necessary changes as the lamp
brightness may now be different.
Thanks,
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Andre Gouws