Evidence map›Paper›PMID 42293112›Full record

ArticlePhysics and imaging in radiation oncology2026

Commissioning of an expanded-field radiation technique using a gimbal-mounted linear accelerator.

Tomohiro Ono, Fumiya Tanaka, Shunta Jinno, Tetsuo Fukuda, Hiroyuki Kato, Hideaki Hirashima, Yuka Ono, Mitsuhiro Nakamura, Takashi Mizowaki

Abstract read
PubMed Full text at PMC Publisher
In one paragraph

Article in Physics and imaging in radiation oncology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

0numbers the graph read from it
0cells of the map it votes in
0citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

0 citing papers in PubMed.

No citing paper in PubMed yet.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

9 authors.

Tomohiro OnoDepartment of Radiation Oncology and Image-Applied Therapy, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
Fumiya TanakaX-Ray Therapy Division, Therapy System Business, Healthcare Business Group, Hitachi HighTech Corporation, Tokyo, Japan.
Shunta JinnoX-Ray Therapy Division, Therapy System Business, Healthcare Business Group, Hitachi HighTech Corporation, Tokyo, Japan.
Tetsuo FukudaX-Ray Therapy Division, Therapy System Business, Healthcare Business Group, Hitachi HighTech Corporation, Tokyo, Japan.
Hiroyuki KatoX-Ray Therapy Division, Therapy System Business, Healthcare Business Group, Hitachi HighTech Corporation, Tokyo, Japan.
Hideaki HirashimaDepartment of Radiation Oncology and Image-Applied Therapy, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
Yuka OnoDepartment of Radiation Oncology and Image-Applied Therapy, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
Mitsuhiro NakamuraDepartment of Advanced Medical Physics, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
Takashi MizowakiDepartment of Radiation Oncology and Image-Applied Therapy, Graduate School of Medicine, Kyoto University, Kyoto, Japan.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Background and purpose: A novel gimbal-mounted linear accelerator (linac) enables off-axis beam delivery. This study was aimed at commissioning an expanded-field radiation technique using a gimbal-mounted linac to validate beam data and implement patient-specific quality assurance (QA). Materials and methods: Measurements were performed with gimbal head rotations of ±50.0 mm at the isocenter plane in both pan and tilt directions and were compared with the treatment planning system (TPS) calculation results. Percentage depth doses (PDDs) were obtained for multi-leaf collimator-shaped field sizes. Off-center ratios (OCRs) were measured at the depth of maximum dose (16 mm for 6 MV and 6 MV-FFF beams) and at depths of 50, 100, and 200 mm. For patient-specific QA, film-based measurements were conducted in patients with breast cancer involving axillary lymph nodes and esophageal cancer. Results: For the PDDs and OCRs, differences between the measured and TPS-calculated doses were maintained within ±2% inside the flattening region at all energy levels under gimbal head rotation. For patient-specific QA, gamma passing rates at 3%/2 mm exceeded 90% for each case. Conclusions: These findings demonstrate that the proposed technique enables precise and effective off-axis beam delivery, thereby advancing the capabilities of modern radiotherapy.

Indexed as

CommissioningExpanded-fieldGimbal-mounted linear acceleratorOXRAYQuality assuranceRadiation techniqueTreatment planning system

Identifiers

PMID42293112
PMCPMC13264245

What OpenQuestion holds

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.