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   


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