Evidence map›Paper›PMID 33119953›Full record

ArticleJournal of applied clinical medical physics2020

Effect of setup error in the single-isocenter technique on stereotactic radiosurgery for multiple brain metastases.

Hisashi Nakano, Satoshi Tanabe, Satoru Utsunomiya, Takumi Yamada, Ryuta Sasamoto, Toshimichi Nakano, Hirotake Saito, Takeshi Takizawa, Hironori Sakai, Atsushi Ohta and 3 more

Abstract read
In one paragraph

Article in Journal of applied clinical medical physics, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 25 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
25citing papers in PubMed, 1 pooled it
–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

25 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
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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

13 authors.

Hisashi NakanoDepartment of Radiation Oncology, Niigata University Medical and Dental Hospital, Chuo-ku, Niigata, Japan.
Satoshi TanabeDepartment of Radiation Oncology, Niigata University Medical and Dental Hospital, Chuo-ku, Niigata, Japan.
Satoru UtsunomiyaDepartment of Radiological Technology, Niigata University Graduate School of Health Sciences, Chuo-ku, Niigata, Japan.
Takumi YamadaSection of Radiology, Department of Clinical Support, Niigata University Medical and Dental Hospital, Chuo-ku, Niigata, Japan.
Ryuta SasamotoDepartment of Radiological Technology, Niigata University Graduate School of Health Sciences, Chuo-ku, Niigata, Japan.
Toshimichi NakanoDepartment of Radiology and Radiation Oncology, Niigata University Graduate School of Medical and Dental Sciences, Chuo-ku, Niigata, Japan.
Hirotake SaitoDepartment of Radiation Oncology, Niigata University Medical and Dental Hospital, Chuo-ku, Niigata, Japan.
Takeshi TakizawaDepartment of Radiology and Radiation Oncology, Niigata University Graduate School of Medical and Dental Sciences, Chuo-ku, Niigata, Japan.
Hironori SakaiSection of Radiology, Department of Clinical Support, Niigata University Medical and Dental Hospital, Chuo-ku, Niigata, Japan.
Atsushi OhtaDepartment of Radiation Oncology, Niigata University Medical and Dental Hospital, Chuo-ku, Niigata, Japan.
Eisuke AbeDepartment of Radiology, Nagaoka Chuo General Hospital, Nagaoka, Japan.
Motoki KaiduDepartment of Radiology and Radiation Oncology, Niigata University Graduate School of Medical and Dental Sciences, Chuo-ku, Niigata, Japan.
Hidefumi AoyamaDepartment of Radiology and Radiation Oncology, Niigata University Graduate School of Medical and Dental Sciences, Chuo-ku, Niigata, Japan.

Funding

Japan Society for the Promotion of Science 19K17227KAKENHI 19K17227
6 · The paper itself

Abstract

In conventional stereotactic radiosurgery (SRS), treatment of multiple brain metastases using multiple isocenters is time-consuming resulting in long dose delivery times for patients. A single-isocenter technique has been developed which enables the simultaneous irradiation of multiple targets at one isocenter. This technique requires accurate positioning of the patient to ensure optimal dose coverage. We evaluated the effect of six degrees of freedom (6DoF) setup errors in patient setups on SRS dose distributions for multiple brain metastases using a single-isocenter technique. We used simulated spherical gross tumor volumes (GTVs) with diameters ranging from 1.0 to 3.0 cm. The distance from the isocenter to the target's center was varied from 0 to 15 cm. We created dose distributions so that each target was entirely covered by 100% of the prescribed dose. The target's position vectors were rotated from 0°-2.0° and translated from 0-1.0 mm with respect to the three axes in space. The reduction in dose coverage for the targets for each setup error was calculated and compared with zero setup error. The calculated margins for the GTV necessary to satisfy the tolerance values for loss of GTV coverage of 3% to 10% were defined as coverage-based margins. In addition, the maximum isocenter to target distance for different 6DoF setup errors was calculated to satisfy the tolerance values. The dose coverage reduction and coverage-based margins increased as the target diameter decreased, and the distance and 6DoF setup error increased. An increase in setup error when a single-isocenter technique is used may increase the risk of missing the tumor; this risk increases with increasing distance from the isocenter and decreasing tumor size.

Indexed as

Brain NeoplasmsRadiosurgeryHumansRadiotherapy DosageRadiotherapy Planning, Computer-Assistedmultiple brain metastasessetup errorsingle-isocenter techniquestereotactic radiosurgeryvolumetric modulated arc therapy

Identifiers

PMID33119953
PMCPMC7769381

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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.