[Gate-users] Hexagon(e) specification

Park MinJae MJ at ToTi.us
Fri Nov 16 02:34:28 CET 2007

Dear Alan,

Technically, your question depends on what material of hole you want to

In common, hole is made by air...so the radius means one of inscribed


//  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

Dr Alan J Green
Senior Lecturer
Cancer Research UK Targeting and Imaging Group
Tel (+44) (0)20 7472 6373
Fax (+44) (0)20 7794 3341 

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