X-Message-Number: 5382 From: (Brian Wowk) Newsgroups: sci.cryonics Subject: Re: MRI of dendritic spines Date: 8 Dec 95 18:54:51 GMT Message-ID: <> References: <49oni9$> <4a7jcv$> In <4a7jcv$> (David L Evens) writes: DE>Greg Stock () wrote: DE>: ---- Forwarded CryoNet Message ---- DE>: Scott Fraser et al. (at Cal Tech) have the record for MRI resolution at 18 um DE>: cubed. Optical coherence microscopy should be able to reach less than 10 DE>: um, but only at depths less than 2 mm. DE>So, it would apprear that, for such tiny samples, it should be possible DE>to obtain results very nearly as good as using optical techniques? The problem is that scan times for this resolution are extremely long (on the order of hours), whereas optical imaging is practically instaneous. While MRI might return some useful information, I think imaging changes in dendritic spines over several hours is out of the question with current MR microscopy technology. New probe designs over the next decade might change that. ---Brian Wowk Rate This Message: http://www.cryonet.org/cgi-bin/rate.cgi?msg=5382