Tuning structure to pull a hotspot in Accuray Precision
Contour the hotspot itself, then constrain it. Faster and more local than raising the global max-dose weight.
Written from documentation and not yet confirmed on a real Accuray Precision. Control names may differ by version — if you use this system, the skill page has a button to confirm or correct it.
Until somebody does, this page is kept out of search results: naming your console in the title is a claim about it, and an unchecked claim is not one worth advertising.
Controls
| Tuning VOI | threshold at the isodose bounding the hotspot | |
| Max Dose | 2–3 % below the current hotspot | |
| Weight | moderate | high weight here flattens the wanted core dose |
Threshold the isodose that bounds the hotspot into a VOI, add it to the optimizer and give it a Max Dose just under where the hotspot currently sits.
Re-optimize, re-threshold, repeat. Two or three rounds usually settles it.
Re-threshold every round. The structure describes where the dose was; after a run it is a shape the dose no longer has, and constraining it wastes weight on empty space.
Why this works, and where the numbers come from →
The recipe is the console; the skill page is the reasoning and the papers behind it.
Same skill elsewhere:Elekta MonacoVarian Eclipse