ARCing Around a Victoreen DoubleCheck Device with PortalVision on


The DoubleCheck Morning Checkout device is barely visible. All you can see is the 3cm steel cylinder which is used for the energy constancy check (and the table top, of course). The 10 chambers of the DoubleCheck are very faintly visible.

The PortalVision is just shooting one picture after the other (continuous acquisition). Since the Pulse Length Servo is replaced by the Pulse Drop Servo during Arc Treatments and the doserate is controlled to match the actual Gantry angle, white horizontal lines appear on the images (which is not so nice). But I was amazed that it works at all. Motion blurring is not as bad as I thought (gantry moves at full speed).

Involvment of the MLC can be seen here.

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