2.4 · CONCEPTS

Dose and distance metrics.

The vocabulary of plan evaluation — D95, V20, mean dose, max dose — computed from the DVH for every mapped structure in every case, and available to queries, charts, scorecards, and monitoring as one consistent set of numbers.

Endpoints bind to mapped structures

A dose endpoint in Radial is always attached to a mapped structure, not a raw string. Parotid_L Dmean means the same thing across every case in the cohort because mapping settled what the parotid is first. That is why curation precedes metrics, and why cohort-level statistics are comparable at all.

PROTOCOLS · CLINICAL-GOAL SHORTHANDMODIFIED MAYO

VFAMILY — VOLUME AT 50GyINPUT — DOSE THRESHOLD [%]OUTPUT — REPORTED UNIT reads: the share of a structure receiving at least 50 Gy, reported in percent.

DFAMILY — DOSE TO 0.03ccINPUT — VOLUME [Gy]OUTPUT — REPORTED UNIT reads: the minimum dose to the hottest 0.03 cc (the near-max), in gray.

OVFAMILY — OVERLAP VOLUME 5mmINPUT — DISTANCE [cc]OUTPUT — REPORTED UNIT (PTV)TARGET — MEASURED AGAINST reads: the volume of a structure lying within 5 mm of PTV, in cc.

DFAMILY — DOSE TO 0.03ccINPUT — VOLUME (3,LQ)PARAMS — α/β · MODEL [EQD2Gy]OUTPUT — EQD2, IN GRAY reads: the same near-max converted to EQD2 at α/β 3, now comparable across fractionation schemes.

One grammar: family, input, reported unit. Mayo notation stops at dose and volume, so Radial extends it: the distance families (overlap-volume and distance-to-target) are our own, built parallel on purpose, with the reference target named in parentheses. Equivalent dose rides in the unit as [EQD2Gy], or any EQDx, with α/β and model declared, so every clinical goal in a protocol stays one vocabulary.

Beyond dose and volume

Alongside Dx and Vx, Radial supports distance-based constraint types: overlap-volume and distance-to-target histograms (OVH and DTH), written in the same modified Mayo shorthand as the dose endpoints. That lets a protocol express geometry-aware expectations, and a reviewer see a per-patient curve behind the number.

Equivalent dose, declared

Any dose endpoint can apply equivalent-dose scaling: EQDx at a declared reference fraction size, α/β, and model, with EQD2 the common case. Declared, because the parameters are clinical: they are always visible, never invisible defaults. Targets are deliberately not converted: Radial separates them by fractionation instead of normalizing away a difference that matters.

Custom metrics: your algebra, computed live

Define any derived metric as free-form algebra over plan fields and dose endpoints bound to real structures. A live preview shows how many cohort cases actually compute and how many come back null before you save, and broken expressions are refused outright. Saved metrics become first-class: columns in the metrics tables, fields in charts, and signals monitoring can watch.

NEXT · 2.5Plan quality RELATED · 3.3Query and population DVH

Dose and distance metrics.

Endpoints bind to mapped structures

Beyond dose and volume

Equivalent dose, declared

Custom metrics: your algebra, computed live

See it on your own terms.