Re: Nucletron HDR

[Chris Alston <alstonc@odrge.odr.georgetown.edu>]

>X-Sender: rvanausdal@cyberia.com
>Date:         Thu, 16 Jul 1998 18:46:34 -0400
>Reply-To: Medical Physics Mailing List <MEDPHYS@LISTS.WAYNE.EDU>
>Sender: Medical Physics Listserver <medphys@cwis-20.wayne.edu>
>From: rvanausdal <rvanausdal@CYBERIA.COM>
>Subject:      Re: Nucletron HDR
>To: MEDPHYS@LISTS.WAYNE.EDU
>
>Did you observe this behavior under remote viewing?  The check source is
>supposed to go approx 5mm BEYOND the last dwell position.  Your behavior
>may have occurred in a catheter whose friction was slowly increasing, and
>finally reached the "obstruction" trigger level at 1404.
>
>I assume that you had something like a flexible lung or interstitial
>catheter, since the maximum dwell point was not 1500.
>
>If you really believe that this occurred inappropriately, you need to call
>service.  We observe our v2 source action daily remotely and have not seen
>such a behavior.
>
>Ray Van Ausdal
>York Hospital
>
>At 11:21 AM 7/15/98 -0700, you wrote:
>>To all Nucletron users:
>>
>>Please be aware that for the V2 (newer design) HDR remote afterloader,
>>the maximum distance that the check cable reports after it hit an
>>obstruction could be off by at least 5 mm.  In our experience, we had
>>the maximum reference length set at 1410, the check cable reported that
>>it hit obstruction at 1404, in reality the maximum length was 1409.  If
>>one changes the maximum reference length based upon the check cable
>>report, one could be in error by at least 5 mm.  This can potentially be
>>a major error for optimized treatment plans.
>>
>>______________________________________
>>Ronny B. Chin, Ph.D.
>>Alta Bates Comprehensive Cancer Center
>>2001 Dwight Way, Berkeley, CA 94704
>>rchin@abccc.salick.com
>>Tel. (510) 204-1043;  Fax (510) 204-1499
>>
>>Attachment Converted: "c:\program files\cyberia\eudora\attach\Nucletron HDR"
>>
>
>                    *****
>Frequently Asked Questions (FAQ) for Medphys at:
>http://www.mindspring.com/~sherouse/MPFAQ/
>
>Archives of recent Medphys postings at:
>http://www.escribe.com/medicine/medphys/
>
Chris Alston
alstonc@odrge.odr.georgetown.edu
I am not here a representative of my employer.