Evidence map›Paper›PMID 33264638›Full record

ArticleRadiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology2021

Multicentre, deep learning, synthetic-CT generation for ano-rectal MR-only radiotherapy treatment planning.

David Bird, Michael G Nix, Hazel McCallum, Mark Teo, Alexandra Gilbert, Nathalie Casanova, Rachel Cooper, David L Buckley, David Sebag-Montefiore, Richard Speight and 2 more

Open access · hybridAbstract readMulticenter Study
In one paragraph

Article in Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 25 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
25citing papers in PubMed, 2 pooled it
8.8field-weighted citation impact, top 2% of its field
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, 2 syntheses or guidelines pooled it, 52 citations in OpenAlex.

  1. Pooled it
  2. Pooled it
  3. Article
  4. Deep Learning for CT Synthesis in Radiotherapy.Bioengineering (Basel, Switzerland) · 2025
    Review
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  17. A Survey on Deep Learning for Precision Oncology.Diagnostics (Basel, Switzerland) · 2022
    Review
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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

12 authors at 3 institutions in 1 country.

David BirdLeeds Cancer Centre, Leeds Teaching Hospitals NHS Trust, United Kingdom; Radiotherapy Research Group, Leeds Institute of Medical Research, University of Leeds, United Kingdom. Electronic address: David.bird3@nhs.net.
Michael G NixLeeds Cancer Centre, Leeds Teaching Hospitals NHS Trust, United Kingdom.
Hazel McCallumNorthern Centre for Cancer Care, Newcastle Upon Tyne Hospitals NHS Foundation Trust, United Kingdom; Centre for Cancer, Newcastle University, United Kingdom.
Mark TeoLeeds Cancer Centre, Leeds Teaching Hospitals NHS Trust, United Kingdom.
Alexandra GilbertLeeds Cancer Centre, Leeds Teaching Hospitals NHS Trust, United Kingdom; Radiotherapy Research Group, Leeds Institute of Medical Research, University of Leeds, United Kingdom.
Nathalie CasanovaLeeds Cancer Centre, Leeds Teaching Hospitals NHS Trust, United Kingdom.
Rachel CooperLeeds Cancer Centre, Leeds Teaching Hospitals NHS Trust, United Kingdom.
David L BuckleyBiomedical Imaging, University of Leeds, United Kingdom.
David Sebag-MontefioreLeeds Cancer Centre, Leeds Teaching Hospitals NHS Trust, United Kingdom; Radiotherapy Research Group, Leeds Institute of Medical Research, University of Leeds, United Kingdom.
Richard SpeightLeeds Cancer Centre, Leeds Teaching Hospitals NHS Trust, United Kingdom.
Bashar Al-QaisiehLeeds Cancer Centre, Leeds Teaching Hospitals NHS Trust, United Kingdom.
Ann M HenryLeeds Cancer Centre, Leeds Teaching Hospitals NHS Trust, United Kingdom; Radiotherapy Research Group, Leeds Institute of Medical Research, University of Leeds, United Kingdom.
Leeds Teaching Hospitals NHS Trust · GBUniversity of Leeds · GBNewcastle upon Tyne Hospitals NHS Foundation Trust · GB

Funding

Cancer Research UK 21993Cancer Research UK 28301Department of Health ICA-CDRF-2017-03-005
6 · The paper itself

Abstract

background and purposeComprehensive dosimetric analysis is required prior to the clinical implementation of pelvic MR-only sites, other than prostate, due to the limited number of site specific synthetic-CT (sCT) dosimetric assessments in the literature. This study aims to provide a comprehensive assessment of a deep learning-based, conditional generative adversarial network (cGAN) model for a large ano-rectal cancer cohort. The following challenges were investigated; T2-SPACE MR sequences, patient data from multiple centres and the impact of sex and cancer site on sCT quality.

methodRT treatment position CT and T2-SPACE MR scans, from two centres, were collected for 90 ano-rectal patients. A cGAN model trained using a focal loss function, was trained and tested on 46 and 44 CT-MR ano-rectal datasets, paired using deformable registration, respectively. VMAT plans were created on CT and recalculated on sCT. Dose differences and gamma indices assessed sCT dosimetric accuracy. A linear mixed effect (LME) model assessed the impact of centre, sex and cancer site.

resultsA mean PTV D95% dose difference of 0.1% (range: -0.5% to 0.7%) was found between CT and sCT. All gamma index (1%/1 mm threshold) measurements were >99.0%. The LME model found the impact of modality, cancer site, sex and centre was clinically insignificant (effect ranges: -0.4% and 0.3%). The mean dose difference for all OAR constraints was 0.1%.

conclusionFocal loss cGAN models using T2-SPACE MR sequences from multiple centres can produce generalisable, dosimetrically accurate sCTs for ano-rectal cancers.

Indexed as

Deep LearningHumansMagnetic Resonance ImagingMaleRadiotherapy DosageRadiotherapy Planning, Computer-AssistedTomography, X-Ray ComputedAno-rectalMagnetic Resonance onlyMR-onlyMR-only treatment planningsCTSynthetic-CT

Identifiers

PMID33264638
PMCPMC8050018
OpenAlexW3108462927

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC-ND
Read underepoch 390

Registered trials

None linked

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.