[Gate-users] Partially replacing volume

[SeungEun Lee]

Dear all,


I want to simulate a phantom which has small air-filled cylinder inside
uniform region (e.g., NEMA NU-4 IQ phantom)

(Air-filled cylinder is not on the axis of cylindrical uniform region, and
length is smaller than uniform region.)

Forbidding 'source' is possible but not 'volume', so non-radioactive water
cold region is possible but not air.
Also I found that volume must not overlap in GATE system, so I cannot
re-define air region inside uniform region(water).

Is there any experience or way to partially replace volume so that
air-filled region can be placed inside water-filled one?



Best regards,
Seungeun Lee.
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