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DOI: 10.1055/s-2008-1004619
© Georg Thieme Verlag Stuttgart · New York
FDG-PET in der Bestrahlungsplanung von nichtkleinzelligen Bronchialkarzinomen
FDG-PET in Radiotherapy Planning of Non Small Cell Lung CancerPublication History
Publication Date:
28 February 2008 (online)
Zusammenfassung
Neben dem Einsatz der FDG-PET beim Staging und Restaging von nichtkleinzelligen Bronchialkarzinomen (NSCLC) ist die Integration von FDG-PET-Daten in die Bestrahlungsplanung ein zukunftsträchtiger Einsatzbereich der PET in der Strahlentherapie. Der mögliche Vorteil für den Patienten liegt in der genaueren Detektion von tumorbefallenen Regionen für die Zielvolumendefinition. Insbesondere in Fällen mit postobstruktiven Belüftungsstörungen senkt die FDG-PET erheblich die Unsicherheit, die sich in der Varianz der Volumendefinition zwischen verschiedenen Therapeuten ausdrückt. Auch die höhere diagnostische Genauigkeit der FDG-PET im Vergleich mit der CT bezüglich des mediastinalen Lymphknotenstagings bei NSCLC könnte zur Beschränkung der Bestrahlung nur auf tumorbefallene Areale führen, wenn die diesbezüglichen Zielvolumenkonzepte entsprechend adaptiert werden. Ein noch ungelöstes Problem ist die beste Art der technischen Konturierung der auflösungs- und bewegungsbedingt nur unscharf abbildbaren FDG-Anreicherung für die Zielvolumendefinition. Hier sind möglicherweise kontrastorientierte Verfahren der gangbarste Weg. Klinische Studien werden zeigen, ob und wie groß der Benefit der FDG-basierten Betrahlungsplanung für Patienten mit NSCLC wirklich ist. Ziel ist das Erreichen höherer, wirksamerer Strahlendosen in präzise definierten kleinen Zielvolumina bei gleichzeitig optimaler Schonung des gesunden Gewebes.
Abstract
Besides the use of FDG-PET in staging and restaging of patients with non-small cell lung cancer (NSCLC), the integration of PET-data into the radiotherapy planning process is a promising field for PET in radiooncology. The possible benefit of the patients lies in the more exact definition of malignant structures for target volume definition. Especially in cases with post-obstructive atelectasis the use of FDG-PET significantly improves the inter-observer-variability of target volumes. Moreover, the higher diagnostic accuracy in lymph node staging compared to CT could lead to a restriction of irradiation fields to FDG positive areas, if clinical target volume concepts were adapted to the new technologies available. Still unsolved is the problem of which is the best method for technical delineation of PET-based target volumes, as due to resolution and movement effects, the FDG-accumulations appear blurred. Here, possibly contrast-oriented methods are of use. Clinical studies will show the benefit of FDG-PET based target volume definition for patients with NSCLC concerning local control and normal tissue complication probability. The aim is to apply higher radiation doses in more exactly defined volumes, while simultaneously sparing normal tissues.
Schlüsselwörter
FDG-PET - PET / CT - Strahlentherapie - Planung - NSCLC
Key words
FDG-PET - FDG-PET / CT - irradiation treatment - planning - NSCLC
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PD Dr. U. Nestle
Klinik für Nuklearmedizin · Universitätsklinikum des Saarlandes
Kirrberger Str.
66421 Homburg / Saar
Email: Ursula.Nestle@uks.eu