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. 2017 Nov 9;12(1):175.
doi: 10.1186/s13014-017-0906-9.

Potential dosimetric benefits of adaptive tumor tracking over the internal target volume concept for stereotactic body radiation therapy of pancreatic cancer

Konstantina Karava  1   2 , Stefanie Ehrbar  3   4 , Oliver Riesterer  3   4 , Johannes Roesch  3   4 , Stefan Glatz  3   4 , Stephan Klöck  3   4 , Matthias Guckenberger  3   4 , Stephanie Tanadini-Lang  3   4
Affiliations

Potential dosimetric benefits of adaptive tumor tracking over the internal target volume concept for stereotactic body radiation therapy of pancreatic cancer

Konstantina Karava et al. Radiat Oncol. .

Abstract

Background: Radiotherapy for pancreatic cancer has two major challenges: (I) the tumor is adjacent to several critical organs and, (II) the mobility of both, the tumor and its surrounding organs at risk (OARs). A treatment planning study simulating stereotactic body radiation therapy (SBRT) for pancreatic tumors with both the internal target volume (ITV) concept and the tumor tracking approach was performed. The two respiratory motion-management techniques were compared in terms of doses to the target volume and organs at risk.

Methods and materials: Two volumetric-modulated arc therapy (VMAT) treatment plans (5 × 5 Gy) were created for each of the 12 previously treated pancreatic cancer patients, one using the ITV concept and one the tumor tracking approach. To better evaluate the overall dose delivered to the moving tumor volume, 4D dose calculations were performed on four-dimensional computed tomography (4DCT) scans. The resulting planning target volume (PTV) size for each technique was analyzed. Target and OAR dose parameters were reported and analyzed for both 3D and 4D dose calculation.

Results: Tumor motion ranged from 1.3 to 11.2 mm. Tracking led to a reduction of PTV size (max. 39.2%) accompanied with significant better tumor coverage (p<0.05, paired Wilcoxon signed rank test) both in 3D and 4D dose calculations and improved organ at risk sparing. Especially for duodenum, stomach and liver, the mean dose was significantly reduced (p<0.05) with tracking for 3D and 4D dose calculations.

Conclusions: By using an adaptive tumor tracking approach for respiratory-induced pancreatic motion management, a significant reduction in PTV size can be achieved, which subsequently facilitates treatment planning, and improves organ dose sparing. The dosimetric benefit of tumor tracking is organ and patient-specific.

Keywords: Motion management; Pancreas; Radiotherapy; Stereotactic body radiation therapy; Tumor tracking.

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Conflict of interest statement

Ethics approval and consent to participate

For this study anonymized patient data was used. According to our local ethics committee this does not require ethics approval.

Consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Figures

Fig. 1
Fig. 1
Linear regression between PTV reduction (%) and 3D tumor motion [Equation: y=-2.28*(3D motion)-4.09, R 2=0.541]
Fig. 2
Fig. 2
Boxplots indicating the distribution of dose parameters for the target volume (3D & 4D dose) over all patients. Target volume: ITV (ITV concept); GTV (tumor tracking approach). 3D= three dimensional; 4D = four dimensional dose. ITV = internal target volume concept; track = tumor tracking approach
Fig. 3
Fig. 3
Dose-volume histograms (DVHs) for the target volume (TV), PTV and GTV, and also for the organs at risk (bowel, duodenum, liver, and stomach) for both dose distributions (3D and 4D) and motion management methods (the ITV concept and tumor tracking approach) in case of patient 1 (pancreatic motion: 11.2 mm) and patient 7 (2.1 mm). Target volume: ITV (ITV concept); GTV (tumor tracking approach). 3D = three dimensional; 4D = four dimensional dose. ITV = internal target volume concept; track = tumor tracking approach
See this image and copyright information in PMC

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