Dosimetric effect of abdominal compression in online adaptive planning for abdominal cancers treated with a 1.5 Tesla magnetic resonance-guided linear accelerator

Moghadaseh Khaleghibizaki; Angela Sobremonte; Luis Perles; Surendra Prajapati; Ergys Subashi; Yao Ding; Kristy Brock; Roya Barati; Eugene Koay; Chad Tang; Jinzhong Yang

doi:10.1016/j.phro.2025.100899

Dosimetric effect of abdominal compression in online adaptive planning for abdominal cancers treated with a 1.5 Tesla magnetic resonance-guided linear accelerator

Moghadaseh Khaleghibizaki, Angela Sobremonte, Luis Perles, Surendra Prajapati, Ergys Subashi, Yao Ding, Kristy Brock, Roya Barati, Eugene Koay, Chad Tang, Jinzhong Yang

Research output: Contribution to journal › Article › peer-review

Abstract

Compression belts (CBs) are sometimes used to reduce respiratory motion during stereotactic body radiotherapy of abdominal cancers with magnetic resonance (MR)-guided online adaptive planning. This study evaluated the dosimetric effects of overriding the relative electron density (ED) value of CBs in creating synthetic computed tomography (CT) scans for MR-guided adaptive planning. We evaluated plans for 12 patients with abdominal cancer and identified that ED values between 0.2 and 0.3 achieved the best approximation of CB ED in dose calculation. Our study presented an approach to estimate appropriate ED overrides for CBs in MR-guided online adaptive planning.

Original language	English (US)
Article number	100899
Journal	Physics and Imaging in Radiation Oncology
Volume	37
DOIs	https://doi.org/10.1016/j.phro.2025.100899
State	Published - Jan 2026

Keywords

Abdominal compression
Electron density override
MR-guided adaptive radiotherapy
Synthetic CT

ASJC Scopus subject areas

Radiation
Oncology
Radiology Nuclear Medicine and imaging

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10.1016/j.phro.2025.100899

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Khaleghibizaki, M., Sobremonte, A., Perles, L., Prajapati, S., Subashi, E., Ding, Y., Brock, K., Barati, R., Koay, E., Tang, C., & Yang, J. (2026). Dosimetric effect of abdominal compression in online adaptive planning for abdominal cancers treated with a 1.5 Tesla magnetic resonance-guided linear accelerator. Physics and Imaging in Radiation Oncology, 37, Article 100899. https://doi.org/10.1016/j.phro.2025.100899

Dosimetric effect of abdominal compression in online adaptive planning for abdominal cancers treated with a 1.5 Tesla magnetic resonance-guided linear accelerator. / Khaleghibizaki, Moghadaseh; Sobremonte, Angela; Perles, Luis et al.
In: Physics and Imaging in Radiation Oncology, Vol. 37, 100899, 01.2026.

Research output: Contribution to journal › Article › peer-review

Khaleghibizaki, M, Sobremonte, A, Perles, L, Prajapati, S, Subashi, E, Ding, Y, Brock, K, Barati, R, Koay, E, Tang, C & Yang, J 2026, 'Dosimetric effect of abdominal compression in online adaptive planning for abdominal cancers treated with a 1.5 Tesla magnetic resonance-guided linear accelerator', Physics and Imaging in Radiation Oncology, vol. 37, 100899. https://doi.org/10.1016/j.phro.2025.100899

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abstract = "Compression belts (CBs) are sometimes used to reduce respiratory motion during stereotactic body radiotherapy of abdominal cancers with magnetic resonance (MR)-guided online adaptive planning. This study evaluated the dosimetric effects of overriding the relative electron density (ED) value of CBs in creating synthetic computed tomography (CT) scans for MR-guided adaptive planning. We evaluated plans for 12 patients with abdominal cancer and identified that ED values between 0.2 and 0.3 achieved the best approximation of CB ED in dose calculation. Our study presented an approach to estimate appropriate ED overrides for CBs in MR-guided online adaptive planning.",

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AU - Khaleghibizaki, Moghadaseh

AU - Sobremonte, Angela

AU - Perles, Luis

AU - Prajapati, Surendra

AU - Subashi, Ergys

AU - Ding, Yao

AU - Brock, Kristy

AU - Barati, Roya

AU - Koay, Eugene

AU - Tang, Chad

AU - Yang, Jinzhong

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N2 - Compression belts (CBs) are sometimes used to reduce respiratory motion during stereotactic body radiotherapy of abdominal cancers with magnetic resonance (MR)-guided online adaptive planning. This study evaluated the dosimetric effects of overriding the relative electron density (ED) value of CBs in creating synthetic computed tomography (CT) scans for MR-guided adaptive planning. We evaluated plans for 12 patients with abdominal cancer and identified that ED values between 0.2 and 0.3 achieved the best approximation of CB ED in dose calculation. Our study presented an approach to estimate appropriate ED overrides for CBs in MR-guided online adaptive planning.

AB - Compression belts (CBs) are sometimes used to reduce respiratory motion during stereotactic body radiotherapy of abdominal cancers with magnetic resonance (MR)-guided online adaptive planning. This study evaluated the dosimetric effects of overriding the relative electron density (ED) value of CBs in creating synthetic computed tomography (CT) scans for MR-guided adaptive planning. We evaluated plans for 12 patients with abdominal cancer and identified that ED values between 0.2 and 0.3 achieved the best approximation of CB ED in dose calculation. Our study presented an approach to estimate appropriate ED overrides for CBs in MR-guided online adaptive planning.

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KW - Electron density override

KW - MR-guided adaptive radiotherapy

KW - Synthetic CT

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Dosimetric effect of abdominal compression in online adaptive planning for abdominal cancers treated with a 1.5 Tesla magnetic resonance-guided linear accelerator

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Keywords

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