[Gate-users] Hexagon(e) specification

[Alan J Green]

Now I am confused! Why (and how for that matter) does the definition 
of a hexagon depend on the material? Can you explain, or point me to 
a reference where I can find an explanation, please?

With thanks

Alan
At 01:34 16/11/2007, Park MinJae wrote:

>Dear Alan,
>
>Technically, your question depends on what material of hole you want to
>make...
>
>In common, hole is made by air...so the radius means one of inscribed
>circle...
>
>Cheers,
>MJ
>
>//=================================================
>//  Park MinJae
>//  SNU BME Ph.D. Candidate
>//
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>
>-----Original Message-----
>From: gate-users-bounces at lists.healthgrid.org
>[mailto:gate-users-bounces at lists.healthgrid.org] On Behalf Of Alan J Green
>Sent: Thursday, November 15, 2007 10:21 PM
>To: gate-users at lists.healthgrid.org
>Subject: [Gate-users] Hexagon(e) specification
>
>When modelling a gamma camera collimator the first hole is specified:
>
>/gate/collimator/daughters/name hole
>/gate/collimator/daughters/insert hexagone
>/gate/hole/geometry/setLength 6.0 cm
>/gate/hole/geometry/setRadius .381 cm
>
>(it's a HEGP collimator)
>
>I think the radius is the radius of the circumscribed (rather than
>the inscribed) circle; can anyone who knows confirm this (or correct
>it), please?
>
>With thanks
>Alan
>
>Dr Alan J Green
>Senior Lecturer
>Cancer Research UK Targeting and Imaging Group
>UCL
>Tel (+44) (0)20 7472 6373
>Fax (+44) (0)20 7794 3341
>
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Dr Alan J Green
Senior Lecturer
Cancer Research UK Targeting and Imaging Group
UCL
Tel (+44) (0)20 7472 6373
Fax (+44) (0)20 7794 3341