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Samenvatting P&O3 Beeldherkenning

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Samenvatting beeldherkenning P&O3

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Beeldherkenning P&O3
Radiotherapie

ICRU
= International Commission on Radiation Units and Measurements.
De commissie houdt zich o.a. bezig met:
 Passende procedures voor meting en toediening ten behoeve van klinische radiologie en
radiobiologie.
 Noodzakelijke fysische data ten behoeve van uniformiteit in ‘reporting’.

Rapporten:
 ICRU-38 t.b.v. intracavitaire RT in gyn.
 ICRU-50 Prescribing, Recording and Reporting Photon Beam Therapy
 ICRU-58 t.b.v. interstitiële RT
 ICRU-62 (update van ICRU 50)
 ICRU-78 Prescribing, Recording, and Reporting Proton-Beam Therapy
 ICRU-83 Prescribing, Recording, and Reporting Photon-Beam Intensity-Modulated Radiation Therapy
(IMRT)

ICRU 50: hoe alle bestralingsplannen worden geregistreerd en gemaakt. Zodanig dat deze wereldwijd
gevolgd kunnen worden.

Aanbevelingen voor fotonenbundels:
 Voorschriften (doseringspunten e.d.)
 Vastleggen (waar komt welke dosis; in ICRU punt, minimale- en maximale dosis)
 Rapporteren (‘afspraken’ tussen de verschillende radiotherapeutische centra)

Volumedefinities

 GTV. Gross Tumor Volume. Tumorvolume dat zichtbaar/palpabel is op CT. Demonstreerbaar.
Verschillende variaties in tekengrootte. Wordt alleen ingetekend als de tumor zichtbaar is (b.v. op
huid).
Onzekerheden GTV-grootte:
1. Inter-observer variatie. Intekenverschillem tussen meerdere artsen.
2. Intra-observer variatie. Zelfde arts, verschillende tekenmomenten.
3. Detailverschil tussen bijvoorbeeld CT en MR.

 CTV. Clinical Target Volume. GTV + eventuele microscopische uitbreiding. Bevat demonstreerbare
GTV en/of subklinische maligne uitbreiding. Uitbreiding verschilt per tumor(soort). Extra marges,
vanwege variaties tekengrootte. Grootte is afhankelijk van behandeling (curiatief/palliatief).
Eventueel een CTV 2 en CTV 3 als blijkt dat meer gebieden subklinische uitbreiding bevatten.
Variaties in CTV:
1. Geometrische variatie en onzekerheden
2. Intrafractionele variatie  tijdens de bestralingssessie

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