Dear Stephen,
yes of course, it *can* boil down to that when you happen to look at an axial slice, from above that is. But what when you view an image in a saggital projection, for example? Would radiological convention then mean 'up=down'?
The handedness definition is a complete definition that spans 3D space, and is as such preferable above an obsolete and underspecified definition.
And when speaking of practice: image formats nowadays (lets say the last 20 yrs) are 3D or 4D. And the way handedness is solved in nii data and SPM/FSL/AFNI is through handedness, not by flipping 2D images. When you need to check or change things to your data that have to do with handedness (or flipping, for that matter), this is the definition to check or fix. So I'd even argue that in practice, handedness makes much more sense than the obsolete radiological or neurological convention.
Just my 2 cts...
Cheers,
Bas
--------------------------------------------------
Dr. S.F.W. Neggers
Division of Brain Research
Rudolf Magnus Institute for Neuroscience
Utrecht University Medical Center
Visiting : Heidelberglaan 100, 3584 CX Utrecht
Room B.01.1.03
Mail : Huispost B01.206, P.O. Box 85500
3508 GA Utrecht, the Netherlands
Tel : +31 (0)88 7559609
Fax : +31 (0)88 7555443
E-mail : [log in to unmask]
Web : http://www.neuromri.nl/people/bas-neggers
: http://www.brainsciencetools.com (CEO)
--------------------------------------------------
________________________________________
From: Stephen J. Fromm [[log in to unmask]]
Sent: Saturday, March 17, 2012 4:36 PM
To: [log in to unmask]; Neggers, S.F.W.
Subject: Re: images in spm99 and spm8
"There is no such thing as radiological or neurological convention for 3D images. Those are concepts from a time people believed brains were flat.
"One speaks of left-or right handed image handedness in 3D, as that fully defines the coordinate systems that are used."
I agree, but I would assume radiological/neurological is still useful, as a practical description, for deciding whether there's a handedness compatibility problem. (E.g. "should be left-on-left, is displayed as left-on-right".)
------------------------------------------------------------------------------
De informatie opgenomen in dit bericht kan vertrouwelijk zijn en is
uitsluitend bestemd voor de geadresseerde. Indien u dit bericht onterecht
ontvangt, wordt u verzocht de inhoud niet te gebruiken en de afzender direct
te informeren door het bericht te retourneren. Het Universitair Medisch
Centrum Utrecht is een publiekrechtelijke rechtspersoon in de zin van de W.H.W.
(Wet Hoger Onderwijs en Wetenschappelijk Onderzoek) en staat geregistreerd bij
de Kamer van Koophandel voor Midden-Nederland onder nr. 30244197.
Denk s.v.p aan het milieu voor u deze e-mail afdrukt.
------------------------------------------------------------------------------
This message may contain confidential information and is intended exclusively
for the addressee. If you receive this message unintentionally, please do not
use the contents but notify the sender immediately by return e-mail. University
Medical Center Utrecht is a legal person by public law and is registered at
the Chamber of Commerce for Midden-Nederland under no. 30244197.
Please consider the environment before printing this e-mail.
|