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22.02.2016 | Original Article

4D-Listmode-PET-CT and 4D-CT for optimizing PTV margins in gastric lymphoma

Determination of intra- and interfractional gastric motion

verfasst von: Gabriele Reinartz, M.D., Uwe Haverkamp, Ph.D., Ramona Wullenkord, Philipp Lehrich, Jan Kriz, M.D., Florian Büther, Klaus Schäfers, Ph.D., Michael Schäfers, M.D., Hans Theodor Eich, M.D.

Erschienen in: Strahlentherapie und Onkologie | Ausgabe 5/2016

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Abstract

Purpose

New imaging protocols for radiotherapy in localized gastric lymphoma were evaluated to optimize planning target volume (PTV) margin and determine intra-/interfractional variation of the stomach.

Methods

Imaging of 6 patients was explored prospectively. Intensity-modulated radiotherapy (IMRT) planning was based on 4D/3D imaging of computed tomography (CT) and positron-emission tomography (PET)-CT. Static and motion gross tumor volume (sGTV and mGTV, respectively) were distinguished by defining GTV (empty stomach), clinical target volume (CTV = GTV + 5 mm margin), PTV (GTV + 10/15/20/25 mm margins) plus paraaortic lymph nodes and proximal duodenum. Overlap of 4D-Listmode-PET-based mCTV with 3D-CT-based PTV (increasing margins) and V95/D95 of mCTV were evaluated. Gastric shifts were determined using online cone-beam CT. Dose contribution to organs at risk was assessed.

Results

The 4D data demonstrate considerable intra-/interfractional variation of the stomach, especially along the vertical axis. Conventional 3D-CT planning utilizing advancing PTV margins of 10/15/20/25 mm resulted in rising dose coverage of mCTV (4D-Listmode-PET-Summation-CT) and rising D95 and V95 of mCTV. A PTV margin of 15 mm was adequate in 3 of 6 patients, a PTV margin of 20 mm was adequate in 4 of 6 patients, and a PTV margin of 25 mm was adequate in 5 of 6 patients.

Conclusion

IMRT planning based on 4D-PET-CT/4D-CT together with online cone-beam CT is advisable to individualize the PTV margin and optimize target coverage in gastric lymphoma.

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Titel: 4D-Listmode-PET-CT and 4D-CT for optimizing PTV margins in gastric lymphoma
Determination of intra- and interfractional gastric motion
verfasst von: Gabriele Reinartz, M.D.
Uwe Haverkamp, Ph.D.
Ramona Wullenkord
Philipp Lehrich
Jan Kriz, M.D.
Florian Büther
Klaus Schäfers, Ph.D.
Michael Schäfers, M.D.
Hans Theodor Eich, M.D.
Publikationsdatum: 22.02.2016
Verlag: Springer Berlin Heidelberg
Erschienen in: Strahlentherapie und Onkologie / Ausgabe 5/2016
Print ISSN: 0179-7158
Elektronische ISSN: 1439-099X
DOI: https://doi.org/10.1007/s00066-016-0949-0

Springer Medizin

4D-Listmode-PET-CT and 4D-CT for optimizing PTV margins in gastric lymphoma

Determination of intra- and interfractional gastric motion