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01-02-2018 | Technical Note

Four-dimensional cone-beam computed tomography-guided radiotherapy for gastric lymphoma

Authors: Ryo Toya, Tetsuo Saito, Yoshinobu Shimohigashi, Yohei Yotsuji, Tomohiko Matsuyama, Takahiro Watakabe, Yudai Kai, Yasuyuki Yamashita, Natsuo Oya

Published in: Japanese Journal of Radiology | Issue 2/2018

Abstract

Purpose

We describe a treatment method with four-dimensional cone-beam computed tomography (4D-CBCT)-guided radiotherapy for gastric lymphoma.

Materials and methods

We performed image-guided radiotherapy (IGRT) with 15 fractions for a gastric mucosa-associated lymphoid tissue lymphoma patient, using 4D-CBCT. The stomach was delineated based on 4D-CT images. For image guidance, an automatic registration between planning CT and 4D-CBCT images was performed based on the bony anatomy (bone matching), followed by manual registration based on the stomach in 4D-CBCT images of all 10 phases (4D matching). We calculated the covering ratio (CR) with variable stomach-to-planning target volume (PTV) margins, based on the images of all phases [CR (%) = the number of covering phases/all 150 phases × 100].

Results

The patient underwent radiotherapy (RT) as scheduled, without any significant adverse effects. The appropriate PTV margins (CR ≥ 95%) were 25 mm (CR 99.3%) and 15 mm (CR 98.7%) for bone and 4D matching, respectively.

Conclusion

4D matching using 4D-CBCT is appropriate for IGRT of gastric lymphomas.

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Title: Four-dimensional cone-beam computed tomography-guided radiotherapy for gastric lymphoma
Authors: Ryo Toya
Tetsuo Saito
Yoshinobu Shimohigashi
Yohei Yotsuji
Tomohiko Matsuyama
Takahiro Watakabe
Yudai Kai
Yasuyuki Yamashita
Natsuo Oya
Publication date: 01-02-2018
Publisher: Springer Japan
Published in: Japanese Journal of Radiology / Issue 2/2018
Print ISSN: 1867-1071
Electronic ISSN: 1867-108X
DOI: https://doi.org/10.1007/s11604-017-0698-8

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Four-dimensional cone-beam computed tomography-guided radiotherapy for gastric lymphoma

Abstract

Purpose

Materials and methods

Results

Conclusion

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Abstract

Purpose

Materials and methods

Results

Conclusion

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