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Auto detection and Beam Hold
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User defines a spherical ROI around these markers :
TI limit
– COG marker on TI is marked with a cross
– If marker on TI is inside TI Limit, circle is projected as green
– If marker outside TI Limit circle is red
– and if marker can’t be detected, circle is projected as orange
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If >=1 markers outside TI limit treatment system can
hold (pause)
the treatment beam: beam hold (BH)
– If time is chosen as trigger and beam is held the system keeps shooting TI
– If all markers return within TI limit system continues beam automatically
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ABH can act in passive or active mode