[ RadSafe ] SPECT/CT survey

[John Jacobus]

There are two different images that are fused
together.  One is from the emissions of the
radioactive isotope in the patient.  These images are
usually fuzzy, and it is difficult to determine the
exact anatomical location in the body.  The other is
from a CT scan of the patient using x-rays which give
a tremendous picture of the gross anatomy, but cannot
identify small lesions what uptake the radioactive
material.  Both are tomographic images, but provide
different pieces or details of information.

In this sense, PET/CT is the same as SPECT/CT.  The
PET resolution of radioactive uptake is much better
than that for the nuclear medicine compound. 

--- Jaro <jaro-10kbq at sympatico.ca> wrote:

> I'm confused -- isn't "SPECT/CT" redundant ?
> .....there's already a "CT" at
> the end of "SPECT"
> 
> The reason I thought there's much more PET than
> SPECT, is because it appears
> that that's all the hospitals (in Canada anyway) are
> buying these days --
> see graph at
>
http://www.cns-snc.ca/branches/quebec/slowpoke/accelerateurs_Canada_2003.jpg
> 
> .....its part of my CNS-Quebec web page presenting
> some basics of PET and
> SPECT (in French only) at
>
http://www.cns-snc.ca/branches/quebec/slowpoke/CHUS_forensique.html
> Included at the bottom of the page are four animated
> 3D pictures obtained
> using both PET and SPECT (you have to click on the
> thumbnails to see them).
> 
> Thnx
> 
>  Jaro
> ^^^^^^^^^^^^^^^^^^^^^
> 
> 
> -----Original Message-----
> From: Richard Smart [mailto:r.smart at unsw.edu.au]
> Sent: Sunday, February 13, 2005 6:49 PM
> To: Jaro; radsafe at radlab.nl
> Subject: Re: [ RadSafe ] SPECT/CT survey
> 
> 
> Dear Jaro,
> 
> I'm not certain what gave you the impression that
> there were more PET units
> than SPECT.  Nearly every gamma camera that has been
> sold in the last 20
> years has had SPECT capabilities.  PET has really
> only entered  main-stream
> clinical utility in the last 5 - 10 years, while
> SPECT has been used
> routinely since the 1970s.
> 
> SPECT units vastly outnumber PET scanners.
> 
> What has changed is the advent of SPECT/CT scanners.
>  Until recently GE was
> the only major producer of a combined scanner. In
> 2004, other major vendors,
> such as Siemens and Philips, introduced integrated
> SPECT/CT scanners.
> PET/CT has been used clinically for a longer period.
> 
> Richard
> 
> ----- Original Message -----
> From: "Jaro" <jaro-10kbq at sympatico.ca>
> To: <radsafe at radlab.nl>
> Sent: Monday, February 14, 2005 5:22 AM
> Subject: RE: [ RadSafe ] SPECT/CT survey
> 
> 
> > That's very interesting John.
> > Somehow, I was under the impression that there
> were many more PET machines
> > in service, than SPECT --- reason being that PETs
> don't need nuke reactors
> > for support, and as we all know, the latter are
> rapidly going out of style
> > (or out of "political correctness").
> > Would you please explain, if possible, why your
> establishment's nuke
> > medicine dep't seems to be bucking the trend ?
> ....or is the appearance of
> > such a trend simply fictitious ?
> >
> > Thanks again.
> >
> >  Jaro
> >
> >  Jaro Franta, P.Eng.
> > Tel.: (514) 875-3444
> > Montréal, Québec
> > frantaj at aecl.ca
> > web master, CNS Québec branch:
> > http://www.cns-snc.ca/branches/quebec/quebec.html
> >
> > <><><><><><><><><><><>
> >
> >
> >
> > -----Original Message-----
> > From: radsafe-bounces at radlab.nl
> [mailto:radsafe-bounces at radlab.nl]On
> Behalf
> > Of John Jacobus
> > Sent: Sunday, February 13, 2005 12:21 PM
> > To: molex77 at yahoo.com; radsafe at radlab.nl
> > Subject: Re: [ RadSafe ] SPECT/CT survey
> >
> >
> > We currently have a single PET/CT scanner, and
> four
> > SPECT cameras.  All of our SPECT images are fused
> to
> > separate CT scanners.
> > <SNIP>
> >
> > --
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=====
+++++++++++++++++++
"Baltimore is actually a very safe city if you are not involved in the drug trade."
DR. PETER BEILENSON, the city's health commissioner.

-- John
John Jacobus, MS
Certified Health Physicist
e-mail:  crispy_bird at yahoo.com


		
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