Elekta 6FFF iView panel saturation issue with Winston Lutz

[Dan Kirby]

Hi all,

We've been happily using the WL analysis for a few years but recently have been finding that the image quality for 6FFF has deteriorated (saturation we think) such that the ball bearing is barely visible. Using half dose rate solves the problem, but then we know that steering is worse at half dose rate (esp 2T) and our gantry iso diameter is then always bigger and often out of tol.

Elekta have tried calibrating the panel with 6FFF setup as XMid, which temprorarily improved it, but then it has worsened again since. I have raised a case but wondered if anyone else has already found a way around this?

I don't understand how it could've been fine for a few years and now it's not. For info, we have the AP panel, Mk6i cabinet and latest version of iView.

Thanks,

Dan