[Gate-users] Hexagon(e) specification

[Park MinJae]

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

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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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