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Whitmore L, Mackay RI, van Herk M, Korysko P, Farabolini W, Malyzhenkov A, Corsini R, Jones RM. CERN-based experiments and Monte-Carlo studies on focused dose delivery with very high energy electron (VHEE) beams for radiotherapy applications. Sci Rep 2024; 14:11120. [PMID: 38750131 PMCID: PMC11096185 DOI: 10.1038/s41598-024-60997-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Accepted: 04/30/2024] [Indexed: 05/18/2024] Open
Abstract
Very High Energy Electron (VHEE) beams are a promising alternative to conventional radiotherapy due to their highly penetrating nature and their applicability as a modality for FLASH (ultra-high dose-rate) radiotherapy. The dose distributions due to VHEE need to be optimised; one option is through the use of quadrupole magnets to focus the beam, reducing the dose to healthy tissue and allowing for targeted dose delivery at conventional or FLASH dose-rates. This paper presents an in depth exploration of the focusing achievable at the current CLEAR (CERN Linear Electron Accelerator for Research) facility, for beam energies >200 MeV. A shorter, more optimal quadrupole setup was also investigated using the TOPAS code in Monte Carlo simulations, with dimensions and beam parameters more appropriate to a clinical situation. This work provides insight into how a focused VHEE radiotherapy beam delivery system might be achieved.
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Affiliation(s)
- L Whitmore
- Department of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, UK
- The Cockcroft Institute of Science and Technology, Daresbury, UK
- Department of Radiation Physics, University of Texas MD Anderson Cancer Center, Houston, USA
| | - R I Mackay
- Division of Cancer Sciences, School of Medical Sciences, Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, UK
- Christie Medical Physics and Engineering, The Christie NHS Foundation Trust, Manchester, UK
| | - M van Herk
- Division of Cancer Sciences, School of Medical Sciences, Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, UK
- Christie Medical Physics and Engineering, The Christie NHS Foundation Trust, Manchester, UK
| | - P Korysko
- Department of Physics, University of Oxford, Oxford, UK
- CERN, 1211, Geneva 23, Switzerland
| | | | | | | | - R M Jones
- Department of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, UK.
- The Cockcroft Institute of Science and Technology, Daresbury, UK.
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Price G, Peek N, Eleftheriou I, Spencer K, Paley L, Hogenboom J, van Soest J, Dekker A, van Herk M, Faivre-Finn C. An Overview of Real-World Data Infrastructure for Cancer Research. Clin Oncol (R Coll Radiol) 2024:S0936-6555(24)00108-0. [PMID: 38631976 DOI: 10.1016/j.clon.2024.03.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Revised: 02/27/2024] [Accepted: 03/13/2024] [Indexed: 04/19/2024]
Abstract
AIMS There is increasing interest in the opportunities offered by Real World Data (RWD) to provide evidence where clinical trial data does not exist, but access to appropriate data sources is frequently cited as a barrier to RWD research. This paper discusses current RWD resources and how they can be accessed for cancer research. MATERIALS AND METHODS There has been significant progress on facilitating RWD access in the last few years across a range of scales, from local hospital research databases, through regional care records and national repositories, to the impact of federated learning approaches on internationally collaborative studies. We use a series of case studies, principally from the UK, to illustrate how RWD can be accessed for research and healthcare improvement at each of these scales. RESULTS For each example we discuss infrastructure and governance requirements with the aim of encouraging further work in this space that will help to fill evidence gaps in oncology. CONCLUSION There are challenges, but real-world data research across a range of scales is already a reality. Taking advantage of the current generation of data sources requires researchers to carefully define their research question and the scale at which it would be best addressed.
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Affiliation(s)
- G Price
- Division of Cancer Sciences, University of Manchester, Manchester, UK; The Christie NHS Foundation Trust, Manchester, UK.
| | - N Peek
- Division of Informatics, Imaging and Data Sciences, University of Manchester, Manchester, UK; The Healthcare Improvement Studies Institute (THIS Institute), University of Cambridge, Cambridge, UK
| | - I Eleftheriou
- Division of Informatics, Imaging and Data Sciences, University of Manchester, Manchester, UK
| | - K Spencer
- Leeds Institute of Health Sciences, University of Leeds, Leeds, UK; Leeds Teaching Hospitals NHS Trust, Leeds, UK; National Disease Registration Service, NHS England, UK
| | - L Paley
- National Disease Registration Service, NHS England, UK
| | - J Hogenboom
- Department of Radiation Oncology (Maastro), GROW-School for Oncology and Reproduction, Maastricht University Medical Centre+, Maastricht, The Netherlands
| | - J van Soest
- Department of Radiation Oncology (Maastro), GROW-School for Oncology and Reproduction, Maastricht University Medical Centre+, Maastricht, The Netherlands; Brightlands Institute for Smart Society (BISS), Faculty of Science and Engineering, Maastricht University, Maastricht, The Netherlands
| | - A Dekker
- Department of Radiation Oncology (Maastro), GROW-School for Oncology and Reproduction, Maastricht University Medical Centre+, Maastricht, The Netherlands
| | - M van Herk
- Division of Cancer Sciences, University of Manchester, Manchester, UK; The Christie NHS Foundation Trust, Manchester, UK
| | - C Faivre-Finn
- Division of Cancer Sciences, University of Manchester, Manchester, UK; The Christie NHS Foundation Trust, Manchester, UK
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Swinton M, Dubec M, McHugh D, Biglin E, Sanchez DF, Oliveira P, Price G, McWilliam A, van Herk M, Hoskin P, Buckley DL, Hudson A, Bristow RG, Choudhury A. Validation of Hypoxia Detection Sequences on the MR Linac. Int J Radiat Oncol Biol Phys 2023; 117:e723-e724. [PMID: 37786109 DOI: 10.1016/j.ijrobp.2023.06.2234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
PURPOSE/OBJECTIVE(S) Magnetic resonance linear accelerator (MRL) systems permit acquisition of novel imaging at the time of radiotherapy. A validated MR hypoxia imaging biomarker could select patients for adaptive radiotherapy with hypoxia modification or dose escalation. The aims of this study were (1) to develop a protocol for quantitative hypoxia sensitive MRI (2) to validate these in prostate cancer (PCa) against pimonidazole-stained prostatectomy sections. MATERIALS/METHODS Blood oxygen level dependent (BOLD), intravoxel incoherent motion (IVIM), oxygen-enhanced (OE) and dynamic contrast enhanced (DCE) MRI were used. Sequences were developed on a diagnostic 1.5 T MR (MRD) and MRL with healthy volunteers and PCa patients. The Hyprogen trial includes men with localized PCa scheduled for prostatectomy. Imaging is acquired twice prior to surgery and oral pimonidazole is taken 8-16 hours before surgery. Whole prostate (WP) and dominant prostatic lesion (DIL) were outlined on T2-weighted (T2W) images and a 'normal prostate' (NP) volume created by subtracting DIL from WP. Contours were applied to parametric maps from the quantitative MRI, with median and IQR extracted. Patient-specific 3D-printed prostate molds were created from WP volumes and used to guide prostate whole organ dissection. RESULTS Three of 20 patients recruited to date. MRI data were acquired successfully. A personalized prostate mold was produced for each patient and facilitated dissection of the prostatectomy specimen in a matching plane to MRI to validate hypoxia detection of the MR protocol. Correlation with pimonidazole staining is underway. Imaging parameter median values for NP and DIL acquired on MRD and MRL for the first patient are shown (Table 1). The expected differences between NP and DIL for T1 and D are seen and median values for T2* are consistent with reported values in the literature. CONCLUSION The MR hypoxia protocol can be acquired safely and is well-tolerated on the MRL. Once validated against pimonidazole staining adaptive radiotherapy protocols will be developed to use this information.
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Affiliation(s)
- M Swinton
- Christie Hospital, Manchester, United Kingdom
| | - M Dubec
- University of Manchester, Manchester, United Kingdom
| | - D McHugh
- The Christie NHS Foundation Trust, Manchester, United Kingdom
| | - E Biglin
- University of Manchester, Manchester, United Kingdom
| | - D F Sanchez
- The Christie NHS Foundation Trust, Manchester, United Kingdom
| | - P Oliveira
- The Christie NHS Foundation Trust, Manchester, United Kingdom
| | - G Price
- The University of Manchester, Manchester, United Kingdom
| | - A McWilliam
- Division of Cancer Sciences, School of Medical Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom
| | - M van Herk
- Division of Cancer Sciences, School of Medical Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom
| | - P Hoskin
- Division of Cancer Sciences, University of Manchester, Manchester, United Kingdom
| | - D L Buckley
- Biomedical Imaging, University of Leeds, Leeds, United Kingdom
| | - A Hudson
- The Christie NHS Foundation Trust, Manchester, United Kingdom
| | - R G Bristow
- Division of Cancer Sciences, University of Manchester, Manchester, United Kingdom
| | - A Choudhury
- Department of Clinical Oncology, The Christie NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK, Manchester, United Kingdom
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van Herk M, Abravan A, Faivre-Finn C, McWilliam A. Evaluation of Observer Variation as Natural Experiment to Detect Sensitive Heart Subregions. Int J Radiat Oncol Biol Phys 2023; 117:e489. [PMID: 37785542 DOI: 10.1016/j.ijrobp.2023.06.1718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
PURPOSE/OBJECTIVE(S) There is growing evidence associating dose to the base of the heart to reduced survival of lung cancer patients (McWilliam EJC 2017). However, randomized evidence on the benefits of sparing the base of the heart is missing. In this study we investigate variability in the shape between patients of heart contours used in planning as a natural experiment to evaluate selective heart sparing. The core assumption is that regions that are not included in the heart delineation will not be spared. MATERIALS/METHODS Data was collected for 1705 lung cancer patients treated in one center between 2010 and 2016 with IMRT/VMAT (55-66Gy in 20-33#) or SABR (54-60Gy in 3-8#), planned using manual heart contours, called delineation 1. Consistent reference heart contours were obtained using a commercial autocontouring software, called delineation 2. Heart shapes were mapped to spherical coordinates (φ, Φ, r) and the difference in radius Δr = r1 - r2 for each set of angles φ, Φ was calculated for all patients. A large Δr means that the manual delineation use for planning is relatively large in the direction. Cox-regression was performed for each set of angles using Δr, r2 and its interaction using overall survival as endpoint. Permutation testing is used to avoid multiple testing issues. The aim is to locate a region of the heart where bigger delineations lead to better sparing and hence better survival. RESULTS On average the heart base in our manual contours extends 34 mm more superior than automatic contours, because our protocol stipulates the inclusion of the full pericardial sac. Δr was not correlated with any clinical variables and is therefore a good candidate as instrumental variable in causal inference. Univariable Cox regression of Δr showed a uniform worsening of survival with larger manual delineations, likely due to reduced overall sparing given the use of volumetric dose constraints. After including the interaction with r2, no significant heart regions were found. However, analysis using the overall volume of the manual and auto-delineated heart did show a small but significant interaction effect where larger manual delineations improved outcome for smaller hearts. Our interpretation is that delineation variability relative to autocontouring (e.g., 1.9 mm SD at right atrium, up to 15 mm SD at apex) is not big enough to impact significantly on the heart dose and therewith survival because volumetric costs functions are used. In the future we will extend this analysis to include planned dose. CONCLUSION Variability in contouring in our cohort is not large enough to be used as a natural experiment to test the impact of selective heart sparing. However, larger volume delineations of small hearts are associated with reduced mortality, suggesting the importance of sparing the base of the heart where most contouring variability occurs.
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Affiliation(s)
- M van Herk
- Division of Cancer Sciences, School of Medical Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom
| | - A Abravan
- Division of Cancer Sciences, School of Medical Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, Manchester, United Kingdom
| | - C Faivre-Finn
- Division of Cancer Sciences, School of Medical Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom
| | - A McWilliam
- Division of Cancer Sciences, School of Medical Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom
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McSweeney D, Gaffney J, Price JM, Lee LW, Thomson DD, McPartlin A, Green A, Bromiley P, van Herk M, McWilliam A. Are Different Modes of Weight Loss Associated with Survival in Oropharyngeal Cancer? Int J Radiat Oncol Biol Phys 2023; 117:e606. [PMID: 37785827 DOI: 10.1016/j.ijrobp.2023.06.1975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
PURPOSE/OBJECTIVE(S) Patients with oropharyngeal squamous cell carcinomas (OPSCC) often lose weight during radical radiotherapy (RT). Nutritional intervention is required in case of severe weight loss. However, weight loss does not provide full insight into body composition changes. Muscle mass is emerging as an important prognostic factor in cancer patients. We employed on-treatment cone-beam CT (CBCT) scans to monitor muscle mass and weight loss under the hypothesis that different modes of weight loss exist and may impact overall survival (OS). MATERIALS/METHODS A retrospective analysis of 197 OPSCC patients treated with definitive or adjuvant (chemo)RT. Weekly weight measurements & CBCTs were collected. Patients were included if at least two time-points were available and the interval between the first and last was between 15-50 days. CBCTs were normalized to account for calibration differences between treatment machines. An in-house deep-learning model automatically segmented the skeletal muscle compartment at C3 on all CBCTs. Segmentations were visually checked and failures removed. Skeletal muscle volume (SMV, in mm3) was extracted after thresholding for intra-muscular fat. Relative changes in weight & SMV were then calculated. Linear models were fitted to each trajectory for every patient and slopes were estimated. The following weight & SMV categories were defined to generate equal groups: lost (more than 0.4 standard deviations (SDs) below the mean (M)), maintained (within +/- 0.4 SDs of M) or gained (more than 0.4 SDs above the M). Table 1 highlights the nine modes of body composition change. The prognostic value of these was investigated in multivariable Cox models accounting for age, sex, disease stage, oropharynx subsite, smoking status, performance status (PS), tumor p16 status, baseline weight & SMV, and treatment prescribed. The primary endpoint was OS. RESULTS Mean weight & SMV changes during treatment were -0.047±0.001% & -0.044±0.019% per day. In multivariable analysis, gaining weight & losing SMV was identified as a significant risk factor for OS (p = 0.01, hazard ratio [95% CI]: 4.59 [1.40-15.10]). In this sub-group, mean weight & SMV change were +0.054±0.008% & -0.396±0.030% per day. PS>2 (p<0.001) & lower baseline weight (p = 0.02) were also significantly associated with OS. CONCLUSION Patients losing substantial SMV but mildly gaining weight have significantly worse OS than others. This suggests there exists a group of patients where nutritional support is needed, but not offered because they maintain weight during treatment. Although our results need validation, continual monitoring of muscle condition during RT would allow these patients to be identified and promptly targeted for nutritional support.
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Affiliation(s)
- D McSweeney
- Division of Cancer Sciences, School of Medical Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom; Radiotherapy Related Research, The Christie NHS Foundation Trust, Manchester, United Kingdom
| | - J Gaffney
- The Christie NHS Foundation Trust, Manchester, United Kingdom
| | - J M Price
- Department of Clinical Oncology, The Christie NHS Foundation Trust, Manchester, United Kingdom
| | - L W Lee
- Department of Clinical Oncology, The Christie NHS Foundation Trust, Manchester, United Kingdom
| | - D D Thomson
- Department of Clinical Oncology, The Christie NHS Foundation Trust, Manchester, United Kingdom
| | - A McPartlin
- Radiation Medicine Program, Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
| | - A Green
- EMBL European Bioinformatics Institute, Cambridge, United Kingdom
| | - P Bromiley
- Division of Informatics, Imaging & Data Sciences, School of Health Sciences, Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, United Kingdom
| | - M van Herk
- Division of Cancer Sciences, School of Medical Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom; Radiotherapy Related Research, The Christie NHS Foundation Trust, Manchester, United Kingdom
| | - A McWilliam
- Division of Cancer Sciences, School of Medical Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom
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Eccles CL, Dubec M, Cobben D, van Herk M, McDaid L, Nelder C, Whiteside L, Davies LSC, McHugh L, Bridge J, Fendallamaro P, Chuter R, Hoskin P, Huddart RA, Choudhury A. Single Institution Preliminary Evaluation of a National Study for the Development of Daily Online Magnetic Resonance Image Guided Radiotherapy. Int J Radiat Oncol Biol Phys 2023; 117:e663. [PMID: 37785963 DOI: 10.1016/j.ijrobp.2023.06.2101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
PURPOSE/OBJECTIVE(S) A 4-stage non-comparative prospective feasibility study to assess and develop imaging protocols for MRIgRT was opened at the first two centers using MR Linac technology in the UK. The primary aims of this study were to determine a) the acceptability of MR images for target and organ at risk delineation and registration; b) inter/intra observer registration and delineation variation. This work reports on the initial results from a single center. MATERIALS/METHODS In June 2019, following ethical and regulatory approvals the 2nd UK centre began study recruitment as follows: Stage A: non-patient volunteer imaging to determine sequence suitability for normal tissue in 6 anatomical sites (head & neck (H&N), chest wall/breast, lung/esophagus, abdomen, male and female pelvis). Volunteers were recruited in cohorts of 3 participants per region, and image quality was assessed by 3 independent observers using a visual guidance assessment tool (VGA). Stage B: the most suitable sequences defined in stage A used to assess the visibility of targets/normal tissues in patient volunteers using the same methods as in stage A. Stage C: patient volunteers were imaged using sequences selected from stage B to determine inter and intra observer segmentation and registration variation. Stage D recruitment of patient and non-patient volunteers for further image develop and refinement of MRIgRT workflows. All participants completed experience questionnaires to optimize workflows. Participants were asked to undergo 1-12 imaging sessions, lasting no more than 60. RESULTS To date 151 participants (61 non-patients; 90 patients) have undergone 231 imaging sessions. From stage B, vendor provided, in-workflow sequences have been agreed from 47 completed VGAs by prioritizing high scores in either the tumor (e.g., lung) or organs at risk (e.g., cervix). T2w 3D sequences scored best in cervix, pancreas, prostate, bladder, liver, soft-tissue metastases and rectal cancers; T1w 3D sequences for H&N, and patient a specific approach for lung. No suitable sequences have been selected for partial breast. Research sequences (e.g., diffusion weighted or motion corrected imaging) have been agreed or are in development in stages C & D for H&N, cervix, bladder and prostate cancers. The mean interobserver (n = 8) vector variation in 5 H&N patients was largest (3.6mm) using T1-CT boney registrations and smallest (2.1mm) using T1-T1 soft-tissue registrations (mean observer match confidence 3.7/5). Analyses using MR to CT, MR to MR and CT to CT registrations in lung, pancreas, cervix, bladder, and prostate have also been completed. Interobserver delineation studies are on-going. CONCLUSION Using a 4-stage non-comparative prospective feasibility study has facilitated clinical implementation MRIgRT of multiple treatment sites at our institution.
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Affiliation(s)
- C L Eccles
- The Christie NHS Foundation Trust, Manchester, United Kingdom
| | - M Dubec
- University of Manchester, Manchester, United Kingdom
| | - D Cobben
- The Clatterbridge Cancer Centre NHS, Liverpool, United Kingdom
| | - M van Herk
- Division of Cancer Sciences, School of Medical Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom
| | - L McDaid
- The Christie NHS Foundation Trust, Manchester, United Kingdom
| | - C Nelder
- The Christie NHS, Manchester, United Kingdom
| | - L Whiteside
- The Christie NHS FT, Manchester, United Kingdom
| | | | - L McHugh
- The Christie NHS FT, Manchester, United Kingdom
| | - J Bridge
- The Christie NHS FT, Manchester, United Kingdom
| | | | - R Chuter
- The Christie NHS Foundation, Manchester, United Kingdom
| | - P Hoskin
- Mount Vernon Cancer Centre, Northwood, United Kingdom
| | - R A Huddart
- The Institute of Cancer Research, Division of Radiotherapy and Imaging, London, United Kingdom
| | - A Choudhury
- Department of Clinical Oncology, The Christie NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK, Manchester, United Kingdom
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Banfill K, Schmitt M, Riley J, McWilliam A, Pemberton L, Chan C, Harris M, Sheikh H, Coote J, Woolf D, Bayman N, Salem A, van Herk M, Faivre-Finn C. EP05.01-012 Avoiding Cardiac Toxicity in Lung Cancer Radiotherapy (ACcoLade) Trial - Initial Results. J Thorac Oncol 2022. [DOI: 10.1016/j.jtho.2022.07.458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Vasquez Osorio E, Abravan A, Green A, van Herk M, Ganderton D, McPartlin A. OC-0255 Dysphagia at 1 year is associated with mean dose to the inferior section of the brainstem. Radiother Oncol 2022. [DOI: 10.1016/s0167-8140(22)02513-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Klaassen L, Jaarsma-Coes M, Verbist B, Vu K, Klaver Y, Rodrigues M, Ferreira T, Nabarro C, Luyten G, Rasch C, van Herk M, Beenakker J. MO-0211 Inter-observer variability in MR-based target volume delineation of uveal melanoma. Radiother Oncol 2022. [DOI: 10.1016/s0167-8140(22)02313-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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McSweeney D, Radhakrishna G, Green A, Bromiley P, van Herk M, McWilliam A. PO-1286 Skeletal muscle measured at T12 is a prognostic biomarker in oesophageal cancer patients. Radiother Oncol 2022. [DOI: 10.1016/s0167-8140(22)03250-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Wilson L, Bryce-Atkinson A, Green A, Merchant T, van Herk M, Vasquez Osorio E, Faught A, Aznar M. PO-1780 Image-based data mining for radiation outcomes research applies to data from children. Radiother Oncol 2022. [DOI: 10.1016/s0167-8140(22)03744-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Abravan A, Faivre-Finn C, Banfill K, Mcwilliam A, van Herk M. OC-0441 Risk of cardiac death increases with dose to cardiac sub structure avoidance region in lung cancer. Radiother Oncol 2022. [DOI: 10.1016/s0167-8140(22)02577-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Dubec M, Datta A, Clough A, Buckley D, Little R, Berks M, Cheung S, Eccles C, Higgins D, Naish J, Matthews J, van Herk M, Bristow R, Parker G, Hoskin P, McPartlin A, Choudhury A, O'Connor J. OC-0623 First-in-human clinical translation of oxygen-enhanced MRI onto an MR Linac. Radiother Oncol 2022. [DOI: 10.1016/s0167-8140(22)02645-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Bryce-Atkinson A, Wilson L, Vasquez Osorio E, Green A, Whitfield G, McCabe M, Merchant T, van Herk M, Faught A, Aznar M. PO-1626 Automatic brain structure segmentation in children with brain tumours. Radiother Oncol 2022. [DOI: 10.1016/s0167-8140(22)03590-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Lindsay J, Bryce-Atkinson A, Meara S, Faivre-Finn C, Eccles C, Aznar M, van Herk M. PO-1631 Feasibility of low-dose 4DCBCT for patient setup and motion measurement. Radiother Oncol 2022. [DOI: 10.1016/s0167-8140(22)03595-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Henderson E, Green A, van Herk M, Vasquez Osorio E. PD-0317 A novel method to predict OAR contour errors without a ground truth using geometric learning. Radiother Oncol 2022. [DOI: 10.1016/s0167-8140(22)02810-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Dubec M, Little R, Buckley D, Hague C, Price J, Berks M, Cheung S, Salah A, Higgins D, Naish J, Matthews J, van Herk M, Parker G, McPartlin A, O'Connor J. PD-0155 Optimising oxygen-enhanced MRI for patients with head and neck carcinoma. Radiother Oncol 2022. [DOI: 10.1016/s0167-8140(22)02760-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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McWilliam A, McSweeney D, Banfill K, van Herk M, Faivre-Finn C, Green A. MO-0391 Predicting early mortality using muscle characteristics for patients with lung cancer. Radiother Oncol 2022. [DOI: 10.1016/s0167-8140(22)02357-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Abravan A, Sitch P, van Herk M, Gaito S, McPartlin A, Sashidaran S, Smith E, Whitfield G, Pan S. PD-0164 Proton therapy reduces the incidence of severe lymphopenia compared with photon. Radiother Oncol 2022. [DOI: 10.1016/s0167-8140(22)02769-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Abravan A, Salem A, Price G, Faivre-Finn C, van Herk M. Effect of systemic inflammation biomarkers on overall survival after lung cancer radiotherapy: a single-center large-cohort study. Acta Oncol 2022; 61:163-171. [PMID: 34979860 DOI: 10.1080/0284186x.2021.2022201] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2021] [Accepted: 10/18/2021] [Indexed: 12/11/2022]
Abstract
INTRODUCTION Recent studies suggest that immune-related cells can be recruited for anti-tumor functions as well as tumor progression and the interplay between systemic inflammation and local immune response may play a major role in the development and progression of various cancers including lung cancer. Inflammatory markers, such as neutrophil-to-lymphocyte ratio (NLR), platelet-to-lymphocyte ratio (PLR), and systemic immune-inflammation index (SII) can be used as surrogate biomarkers of host immune status. In this work, associations between neutrophils, lymphocytes, platelets, NLR, PLR, SII and overall survival (OS) are investigated in two cohorts of non-small cell lung cancer (NSCLC) patients treated with fractionated radiotherapy (RT) and stereotactic body radiation therapy (SBRT) and a cohort of small cell lung cancer (SCLC) patients treated with fractionated RT. MATERIAL AND METHODS Data from 2513 lung cancer patients were retrospectively analyzed. Baseline NLR, PLR, and SII (NLR × platelet count) were calculated from full blood test prior to RT initiation. Cox proportional hazards regression analyses were used to evaluate the association between systemic inflammation markers and known clinical factors with OS. RESULTS The two-year OS was 42%, 63%, and 62% in the NSCLC fractionated RT, SBRT, and SCLC cohort. NLR (per 1 unit: hazard ratio [HR]: 1.04, p < 0.05) and SII (per 100 × 109/L: HR: 1.01, p < 0.05) remained the strongest independent factors of OS in multivariable Cox analyses, correcting for clinical factors in early-stage and locally advanced NSCLC and SCLC patients treated with RT. DISCUSSION This single-center large-cohort study suggests that baseline NLR and SII are independent prognostic biomarkers associated with OS in locally advanced and early-stage NSCLC patients treated with either curative-intent fractionated RT or SBRT and SCLC patients treated with curative-intent fractionated RT. External validation is warranted to evaluate the utility of these biomarkers for patients' stratification and adapting new treatment approaches.
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Affiliation(s)
- A Abravan
- Division of Cancer Sciences, The University of Manchester, Manchester, UK
- Radiotherapy Related Research, The Christie NHS Foundation Trust, Manchester, UK
| | - A Salem
- Division of Cancer Sciences, The University of Manchester, Manchester, UK
- Radiotherapy Related Research, The Christie NHS Foundation Trust, Manchester, UK
| | - G Price
- Radiotherapy Related Research, The Christie NHS Foundation Trust, Manchester, UK
| | - C Faivre-Finn
- Division of Cancer Sciences, The University of Manchester, Manchester, UK
- Radiotherapy Related Research, The Christie NHS Foundation Trust, Manchester, UK
| | - M van Herk
- Division of Cancer Sciences, The University of Manchester, Manchester, UK
- Radiotherapy Related Research, The Christie NHS Foundation Trust, Manchester, UK
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Amugongo L, Osorio EV, Green A, Cobben D, van Herk M, McWilliam A. Impact of registration uncertainties on the prediction of early tumour response to radiotherapy in NSCLC patients. Phys Med 2021. [DOI: 10.1016/s1120-1797(22)00120-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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Abravan A, Vasquez Osorio E, Green A, McPartlin A, van Herk M. Anatomical Association of Dose Distribution With Radiotherapy-Related Lymphopenia in Oropharynx Cancer. Int J Radiat Oncol Biol Phys 2021. [DOI: 10.1016/j.ijrobp.2021.07.1200] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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McNair HA, Franks KN, van Herk M. On Target 2: Updated Guidance for Image-guided Radiotherapy. Clin Oncol (R Coll Radiol) 2021; 34:187-188. [PMID: 34728132 DOI: 10.1016/j.clon.2021.10.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Accepted: 10/11/2021] [Indexed: 11/03/2022]
Affiliation(s)
- H A McNair
- Royal Marsden NHS Foundation Trust, Sutton, UK; Institute of Cancer Research, London, UK.
| | - K N Franks
- Leeds Cancer Centre, Leeds Teaching Hospitals NHS Trust, Leeds, UK; Leeds Institute of Medical Research at St James's, Faculty of Medicine and Health, University of Leeds, Leeds, UK
| | - M van Herk
- Division of Cancer Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
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Brown S, Beasley M, Aznar MC, Belderbos J, Chuter R, Cobben D, Faivre-Finn C, Franks K, Henry A, Murray L, Price G, van Herk M. The Impact of Intra-thoracic Anatomical Changes upon the Delivery of Lung Stereotactic Ablative Radiotherapy. Clin Oncol (R Coll Radiol) 2021; 33:e413-e421. [PMID: 34001380 DOI: 10.1016/j.clon.2021.04.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Revised: 03/29/2021] [Accepted: 04/21/2021] [Indexed: 12/25/2022]
Abstract
AIMS So far, the impact of intra-thoracic anatomical changes (ITACs) on patients treated with stereotactic ablative radiotherapy (SABR) for early-stage non-small cell lung cancer is unknown. Studying these is important, as ITACs have the potential to impact the workflow and reduce treatment quality. The aim of this study was to assess and categorise ITACs, as detected on cone beam computed tomography scans (CBCT), and their subsequent impact upon treatment in lung cancer patients treated with SABR. MATERIALS AND METHODS CBCTs from 100 patients treated with SABR for early non-small cell lung cancer were retrospectively reviewed. The presence of the following ITACs was assessed: atelectasis, infiltrative change, pleural effusion, baseline shift and gross tumour volume (GTV) increase and decrease. ITACs were graded using a traffic light protocol. This was adapted from a tool previously developed to assesses potential target undercoverage or organ at risk overdose. The frequency of physics or clinician review was noted. A linear mixed effects model was used to assess the relationship between ITAC grade and set-up time (time from first CBCT to beam delivery). RESULTS ITACs were observed in 22% of patients. Twenty-one per cent of these were categorised as 'red', implying a risk of underdosage to the GTV. Most were 'yellow' (51%), indicating little impact upon planning target volume coverage of the GTV. Physics or clinician review was required in 10% of all treatment fractions overall. Three patients needed their treatment replanned. The mixed effect model analysis showed that ITACs cause a significant prolongation of set-up time (Χ2(3) = 9.22, P = 0.02). CONCLUSION Most ITACs were minor, but associated with unplanned physics or clinician review, representing a potentially significant resource burden. ITACs also had a significant impact upon set-up time, with consequences for the wider workflow and intra-fraction motion. Detailed guidance on the management of ITACs is needed to provide support for therapeutic radiographers delivering lung SABR.
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Affiliation(s)
- S Brown
- Clinical Oncology, The Christie NHS Foundation Trust, Manchester, UK; Gloucestershire Oncology Centre, Gloucestershire Hospitals NHS Foundation Trust, Cheltenham, UK.
| | - M Beasley
- Leeds Cancer Centre, Leeds Teaching Hospitals NHS Trust, Leeds, UK
| | - M C Aznar
- Division of Cancer Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
| | - J Belderbos
- Department of Radiation Oncology, Netherlands Cancer Institute, Amsterdam, the Netherlands
| | - R Chuter
- Clinical Oncology, The Christie NHS Foundation Trust, Manchester, UK; Division of Cancer Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
| | - D Cobben
- Clinical Oncology, The Christie NHS Foundation Trust, Manchester, UK; Division of Cancer Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
| | - C Faivre-Finn
- Clinical Oncology, The Christie NHS Foundation Trust, Manchester, UK; Division of Cancer Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
| | - K Franks
- Leeds Cancer Centre, Leeds Teaching Hospitals NHS Trust, Leeds, UK
| | - A Henry
- Leeds Cancer Centre, Leeds Teaching Hospitals NHS Trust, Leeds, UK; Leeds Institute of Medical Research, University of Leeds, Leeds, UK
| | - L Murray
- Leeds Cancer Centre, Leeds Teaching Hospitals NHS Trust, Leeds, UK; Leeds Institute of Medical Research, University of Leeds, Leeds, UK
| | - G Price
- Clinical Oncology, The Christie NHS Foundation Trust, Manchester, UK; Division of Cancer Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
| | - M van Herk
- Division of Cancer Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
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Sanderson B, Joseph N, Elumalai T, Cree A, van Herk M, Hoskin P, McWilliam A, Song Y, Choudhury A. PO-1518 Effect of bladder filling protocols on bladder volume variation in the age of adaptive radiotherapy. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)07969-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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McWilliam A, Abravan A, Banfill K, Price G, Faivre-Finn C, van Herk M. PH-0275 Estimating the casual effect of reducing dose to cardiac structures in lung cancer radiotherapy. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)07290-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Sargeant C, Davey A, van Herk M, McWilliam A. PO-1821 Impact of motion compensated reconstruction of 4DCT on radiomic features. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)08272-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Lindsay J, Bryce-Atkinson A, Meara S, Lines D, van Herk M, Aznar M. PO-1678 simulation of low-dose cone beam CT for paediatric image-guided proton beam therapy. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)08129-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Craddock M, Nestle U, Schimek-Jasch T, Kremp S, Lenz S, Price G, Salem A, Faivre-Finn C, van Herk M, McWilliam A. OC-0190 Validation of the impact of heart base dose on survival in NSCLC patients from the PET-Plan Trial. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)06805-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Davey A, van Herk M, Faivre-Finn C, Lilley J, Sun F, Franks K, McWilliam A. OC-0640 Dose-density interaction predicts local relapse and distant metastasis following lung SABR. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)06996-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Mbanu P, Vasquez Osorio E, Mistry H, Mercer J, Malcomson L, Kochhar R, Renehan A, van Herk M, Saunders M. PH-0105 Prediction of clinical complete response in rectal cancer using clinical and radiomics features. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)07239-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Abravan A, Faivre-Finn C, Khalifa J, Banfill K, McWilliam A, van Herk M. OC-0191 Cardiac death relates to cardiac admission and left anterior descending artery RTdose in lung cancer. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)06806-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Robbins J, Argota-Perez R, Green A, van Herk M, Korreman S, Vasquez Osorio E. OC-0363 Evaluation of how well a PCA model represents anatomical variations during H&N radiation treatment. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)06878-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Eiben B, Chandy E, Abravan A, Rompokos V, Grimes H, D’Souza D, Poynter A, van Herk M, McClelland J. PD-0893 Probabilistic lung tumour target definition from 4DCT data: A motion model based approach. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)07172-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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35
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van Herk M, Bryce-Atkinson A, Lindsay J, Faivre-Finn C, Eccles C. PO-1755 What is the best reference image for IGRT using 4D CBCT? Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)08206-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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McSweeney D, Bromiley P, van Herk M, Green A, McWilliam A. PO-1673 Improving data collection for deep-learning auto-segmentation models. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)08124-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Henderson E, Vasquez Osorio E, van Herk M, Brouwer C, Steenbakkers R, Green A. PO-1695 Accurate H&N 3D segmentation with limited training data using 2-stage CNNs. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)08146-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Whitmore L, Mackay RI, van Herk M, Jones JK, Jones RM. Focused VHEE (very high energy electron) beams and dose delivery for radiotherapy applications. Sci Rep 2021; 11:14013. [PMID: 34234203 PMCID: PMC8263594 DOI: 10.1038/s41598-021-93276-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Accepted: 06/10/2021] [Indexed: 12/04/2022] Open
Abstract
This paper presents the first demonstration of deeply penetrating dose delivery using focused very high energy electron (VHEE) beams using quadrupole magnets in Monte Carlo simulations. We show that the focal point is readily modified by linearly changing the quadrupole magnet strength only. We also present a weighted sum of focused electron beams to form a spread-out electron peak (SOEP) over a target region. This has a significantly reduced entrance dose compared to a proton-based spread-out Bragg peak (SOBP). Very high energy electron (VHEE) beams are an exciting prospect in external beam radiotherapy. VHEEs are less sensitive to inhomogeneities than proton and photon beams, have a deep dose reach and could potentially be used to deliver FLASH radiotherapy. The dose distributions of unfocused VHEE produce high entrance and exit doses compared to other radiotherapy modalities unless focusing is employed, and in this case the entrance dose is considerably improved over existing radiations. We have investigated both symmetric and asymmetric focusing as well as focusing with a range of beam energies.
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Affiliation(s)
- L Whitmore
- Department of Physics and Astronomy, University of Manchester, Manchester, UK
- The Cockcroft Institute of Science and Technology, Daresbury, Warrington, UK
| | - R I Mackay
- The Christie NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK
- Division of Cancer Sciences, School of Medical Sciences, Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, UK
| | - M van Herk
- The Christie NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK
- Division of Cancer Sciences, School of Medical Sciences, Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, UK
| | - J K Jones
- The Cockcroft Institute of Science and Technology, Daresbury, Warrington, UK
- ASTeC, STFC Daresbury Laboratory, Daresbury, Warrington, UK
| | - R M Jones
- Department of Physics and Astronomy, University of Manchester, Manchester, UK.
- The Cockcroft Institute of Science and Technology, Daresbury, Warrington, UK.
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Hague C, McPartlin A, Lee LW, Hughes C, Mullan D, Beasley W, Green A, Price G, Whitehurst P, Slevin N, van Herk M, West C, Chuter R. An evaluation of MR based deep learning auto-contouring for planning head and neck radiotherapy. Radiother Oncol 2021; 158:112-117. [PMID: 33636229 DOI: 10.1016/j.radonc.2021.02.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Revised: 02/02/2021] [Accepted: 02/15/2021] [Indexed: 10/22/2022]
Abstract
INTRODUCTION Auto contouring models help consistently define volumes and reduce clinical workload. This study aimed to evaluate the cross acquisition of a Magnetic Resonance (MR) deep learning auto contouring model for organ at risk (OAR) delineation in head and neck radiotherapy. METHODS Two auto contouring models were evaluated using deep learning contouring expert (DLCExpert) for OAR delineation: a CT model (modelCT) and an MR model (modelMRI). Models were trained to generate auto contours for the bilateral parotid glands and submandibular glands. Auto-contours for modelMRI were trained on diagnostic images and tested on 10 diagnostic, 10 MR radiotherapy planning (RTP), eight MR-Linac (MRL) scans and, by modelCT, on 10 CT planning scans. Goodness of fit scores, dice similarity coefficient (DSC) and distance to agreement (DTA) were calculated for comparison. RESULTS ModelMRI contours improved the mean DSC and DTA compared with manual contours for the bilateral parotid glands and submandibular glands on the diagnostic and RTP MRs compared with the MRL sequence. There were statistically significant differences seen for modelMRI compared to modelCT for the left parotid (mean DTA 2.3 v 2.8 mm), right parotid (mean DTA 1.9 v 2.7 mm), left submandibular gland (mean DTA 2.2 v 2.4 mm) and right submandibular gland (mean DTA 1.6 v 3.2 mm). CONCLUSION A deep learning MR auto-contouring model shows promise for OAR auto-contouring with statistically improved performance vs a CT based model. Performance is affected by the method of MR acquisition and further work is needed to improve its use with MRL images.
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Affiliation(s)
- C Hague
- Department of Head and Neck Clinical Oncology, The Christie NHS Foundation Trust, Manchester, UK.
| | - A McPartlin
- Department of Head and Neck Clinical Oncology, The Christie NHS Foundation Trust, Manchester, UK.
| | - L W Lee
- Department of Head and Neck Clinical Oncology, The Christie NHS Foundation Trust, Manchester, UK.
| | - C Hughes
- Department of Head and Neck Clinical Oncology, The Christie NHS Foundation Trust, Manchester, UK.
| | - D Mullan
- Department of Radiology, The Christie NHS Foundation Trust, Manchester, UK.
| | - W Beasley
- Christie Medical Physics and Engineering, The Christie NHS Foundation Trust, Manchester, UK.
| | - A Green
- Division of Cancer Sciences, Faculty of Biology, Medicine and Heath, University of Manchester, Manchester Academic Health Science Centre, The Christie NHS Foundation Trust, Manchester, UK.
| | - G Price
- Division of Cancer Sciences, Faculty of Biology, Medicine and Heath, University of Manchester, Manchester Academic Health Science Centre, The Christie NHS Foundation Trust, Manchester, UK.
| | - P Whitehurst
- Christie Medical Physics and Engineering, The Christie NHS Foundation Trust, Manchester, UK.
| | - N Slevin
- Department of Head and Neck Clinical Oncology, The Christie NHS Foundation Trust, Manchester, UK
| | - M van Herk
- Christie Medical Physics and Engineering, The Christie NHS Foundation Trust, Manchester, UK; Division of Cancer Sciences, Faculty of Biology, Medicine and Heath, University of Manchester, Manchester Academic Health Science Centre, The Christie NHS Foundation Trust, Manchester, UK.
| | - C West
- Division of Cancer Sciences, Faculty of Biology, Medicine and Heath, University of Manchester, Manchester Academic Health Science Centre, The Christie NHS Foundation Trust, Manchester, UK.
| | - R Chuter
- Christie Medical Physics and Engineering, The Christie NHS Foundation Trust, Manchester, UK; Division of Cancer Sciences, Faculty of Biology, Medicine and Heath, University of Manchester, Manchester Academic Health Science Centre, The Christie NHS Foundation Trust, Manchester, UK.
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Shortall J, Vasquez Osorio E, Cree A, Song Y, Dubec M, Chuter R, Price G, McWilliam A, Kirkby K, Mackay R, van Herk M. Inter- and intra-fractional stability of rectal gas in pelvic cancer patients during MRIgRT. Med Phys 2021; 48:414-426. [PMID: 33164217 DOI: 10.1002/mp.14586] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 10/08/2020] [Accepted: 10/31/2020] [Indexed: 11/07/2022] Open
Abstract
PURPOSE Due to the electron return effect (ERE) during magnetic resonance imaging guided radiotherapy (MRIgRT), rectal gas during pelvic treatments can result in hot spots of over-dosage in the rectal wall. Determining the clinical impact of this effect on rectal toxicity requires estimation of the amount and mobility (and stability) of rectal gas during treatment. We therefore investigated the amount of rectal gas and local inter- and intra-fractional changes of rectal gas in pelvic cancer patients. METHODS To estimate the volume of gas present at treatment planning, the rectal gas contents in the planning computed tomography (CT) scans of 124 bladder, 70 cervical and 2180 prostate cancer patients were calculated. To estimate inter- and intra-fractional variations in rectal gas, 174 and 131 T2-w MRIs for six cervical and eleven bladder cancer patients were used. These scans were acquired during four scan-sessions (~20-25 min each) at various time-points. Additionally, 258 T2-w MRIs of the first five prostate cancer patients treated using MRIgRT at our center, acquired during each fraction, were analyzed. Rectums were delineated on all scans. The area of gas within the rectum delineations was identified on each MRI slice using thresholding techniques. The area of gas on each slice of the rectum was used to calculate the inter- and intra-fractional group mean, systematic and random variations along the length of the rectum. The cumulative dose perturbation as a result of the gas was estimated. Two approaches were explored: accounting or not accounting for the gas at the start of the scan-session. RESULTS Intra-fractional variations in rectal gas are small compared to the absolute volume of rectal gas detected for all patient groups. That is, rectal gas is likely to remain stable for periods of 20-25 min. Larger volumes of gas and larger variations in gas volume were observed in bladder cancer patients compared with cervical and prostate cancer patients. For all patients, local cumulative dose perturbations per beam over an entire treatment in the order of 60 % were estimated when gas had not been accounted for in the daily adaption. The calculated dose perturbation over the whole treatment was dramatically reduced in all patients when accounting for the gas in the daily set-up image. CONCLUSION Rectal gas in pelvic cancer patients is likely to remain stable over the course of an MRIgRT fraction, and also likely to reappear in the same location in multiple fractions, and can therefore result in clinically relevant over-dosage in the rectal wall. The over-dosage is reduced when accounting for gas in the daily adaption.
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Affiliation(s)
- J Shortall
- Department of Cancer Sciences, The University of Manchester, Manchester, UK
| | - E Vasquez Osorio
- Department of Cancer Sciences, The University of Manchester, Manchester, UK
| | - A Cree
- Department of Cancer Sciences, The University of Manchester, Manchester, UK
- The Christie NHS Foundation Trust, Manchester, UK
| | - Y Song
- Department of Cancer Sciences, The University of Manchester, Manchester, UK
- The Christie NHS Foundation Trust, Manchester, UK
| | - M Dubec
- Department of Cancer Sciences, The University of Manchester, Manchester, UK
- The Christie NHS Foundation Trust, Manchester, UK
| | - R Chuter
- Department of Cancer Sciences, The University of Manchester, Manchester, UK
- The Christie NHS Foundation Trust, Manchester, UK
| | - G Price
- Department of Cancer Sciences, The University of Manchester, Manchester, UK
- The Christie NHS Foundation Trust, Manchester, UK
| | - A McWilliam
- Department of Cancer Sciences, The University of Manchester, Manchester, UK
- The Christie NHS Foundation Trust, Manchester, UK
| | - K Kirkby
- Department of Cancer Sciences, The University of Manchester, Manchester, UK
- The Christie NHS Foundation Trust, Manchester, UK
| | - R Mackay
- Department of Cancer Sciences, The University of Manchester, Manchester, UK
- The Christie NHS Foundation Trust, Manchester, UK
| | - M van Herk
- Department of Cancer Sciences, The University of Manchester, Manchester, UK
- The Christie NHS Foundation Trust, Manchester, UK
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Virgolin M, Wang Z, Balgobind BV, van Dijk IWEM, Wiersma J, Kroon PS, Janssens GO, van Herk M, Hodgson DC, Zadravec Zaletel L, Rasch CRN, Bel A, Bosman PAN, Alderliesten T. Surrogate-free machine learning-based organ dose reconstruction for pediatric abdominal radiotherapy. Phys Med Biol 2020; 65:245021. [PMID: 32580177 DOI: 10.1088/1361-6560/ab9fcc] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
To study radiotherapy-related adverse effects, detailed dose information (3D distribution) is needed for accurate dose-effect modeling. For childhood cancer survivors who underwent radiotherapy in the pre-CT era, only 2D radiographs were acquired, thus 3D dose distributions must be reconstructed from limited information. State-of-the-art methods achieve this by using 3D surrogate anatomies. These can however lack personalization and lead to coarse reconstructions. We present and validate a surrogate-free dose reconstruction method based on Machine Learning (ML). Abdominal planning CTs (n = 142) of recently-treated childhood cancer patients were gathered, their organs at risk were segmented, and 300 artificial Wilms' tumor plans were sampled automatically. Each artificial plan was automatically emulated on the 142 CTs, resulting in 42,600 3D dose distributions from which dose-volume metrics were derived. Anatomical features were extracted from digitally reconstructed radiographs simulated from the CTs to resemble historical radiographs. Further, patient and radiotherapy plan features typically available from historical treatment records were collected. An evolutionary ML algorithm was then used to link features to dose-volume metrics. Besides 5-fold cross validation, a further evaluation was done on an independent dataset of five CTs each associated with two clinical plans. Cross-validation resulted in mean absolute errors ≤ 0.6 Gy for organs completely inside or outside the field. For organs positioned at the edge of the field, mean absolute errors ≤ 1.7 Gy for [Formula: see text], ≤ 2.9 Gy for [Formula: see text], and ≤ 13% for [Formula: see text] and [Formula: see text], were obtained, without systematic bias. Similar results were found for the independent dataset. To conclude, we proposed a novel organ dose reconstruction method that uses ML models to predict dose-volume metric values given patient and plan features. Our approach is not only accurate, but also efficient, as the setup of a surrogate is no longer needed.
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Affiliation(s)
- M Virgolin
- Life Sciences and Health Group, Centrum Wiskunde & Informatica, The Netherlands. shared first authorship, the two authors contributed equally to this work
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Bryce-Atkinson A, de Jong R, Bel A, Aznar MC, Whitfield G, van Herk M. Evaluation of Ultra-low-dose Paediatric Cone-beam Computed Tomography for Image-guided Radiotherapy. Clin Oncol (R Coll Radiol) 2020; 32:835-844. [PMID: 33067079 DOI: 10.1016/j.clon.2020.09.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 09/11/2020] [Accepted: 09/29/2020] [Indexed: 01/01/2023]
Abstract
AIMS In image-guided radiotherapy, daily cone-beam computed tomography (CBCT) is rarely applied to children due to concerns over imaging dose. Simulating low-dose CBCT can aid clinical protocol design by allowing visualisation of new scan protocols in patients without delivering additional dose. This work simulated ultra-low-dose CBCT and evaluated its use for paediatric image-guided radiotherapy by assessment of image registration accuracy and visual image quality. MATERIALS AND METHODS Ultra-low-dose CBCT was simulated by adding the appropriate amount of noise to projection images prior to reconstruction. This simulation was validated in phantoms before application to paediatric patient data. Scans from 20 patients acquired at our current clinical protocol (0.8 mGy) were simulated for a range of ultra-low doses (0.5, 0.4, 0.2 and 0.125 mGy) creating 100 scans in total. Automatic registration accuracy was assessed in all 100 scans. Inter-observer registration variation was next assessed for a subset of 40 scans (five scans at each simulated dose and 20 scans at the current clinical protocol). This subset was assessed for visual image quality by Likert scale grading of registration performance and visibility of target coverage, organs at risk, soft-tissue structures and bony anatomy. RESULTS Simulated and acquired phantom scans were in excellent agreement. For patient scans, bony atomy registration discrepancies for ultra-low-dose scans fell within 2 mm (translation) and 1° (rotation) compared with the current clinical protocol, with excellent inter-observer agreement. Soft-tissue registration showed large discrepancies. Bone visualisation and registration performance reached over 75% acceptability (rated 'well' or 'very well') down to the lowest doses. Soft-tissue visualisation did not reach this threshold for any dose. CONCLUSION Ultra-low-dose CBCT was accurately simulated and evaluated in patient data. Patient scans simulated down to 0.125 mGy were appropriate for bony anatomy set-up. The large dose reduction could allow for more frequent (e.g. daily) image guidance and, hence, more accurate set-up for paediatric radiotherapy.
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Affiliation(s)
- A Bryce-Atkinson
- Division of Cancer Sciences, School of Medical Sciences, Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, UK.
| | - R de Jong
- Department of Radiation Oncology, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, the Netherlands
| | - A Bel
- Department of Radiation Oncology, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, the Netherlands
| | - M C Aznar
- Division of Cancer Sciences, School of Medical Sciences, Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, UK; Clinical Trial Service Unit, Nuffield Department of Population Health, University of Oxford, Oxford, UK
| | - G Whitfield
- Manchester Academic Health Science Centre, The Christie NHS Foundation Trust, Manchester, UK; The Children's Brain Tumour Research Network, The University of Manchester, Royal Manchester Children's Hospital, Manchester, UK
| | - M van Herk
- Division of Cancer Sciences, School of Medical Sciences, Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, UK
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Mercieca S, Pan S, Belderbos J, Salem A, Tenant S, Aznar MC, Woolf D, Radhakrishna G, van Herk M. Impact of Peer Review in Reducing Uncertainty in the Definition of the Lung Target Volume Among Trainee Oncologists. Clin Oncol (R Coll Radiol) 2020; 32:363-372. [PMID: 32033892 DOI: 10.1016/j.clon.2020.01.026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Revised: 11/06/2019] [Accepted: 12/04/2019] [Indexed: 12/25/2022]
Abstract
AIMS To evaluate the impact of peer review and contouring workshops on reducing uncertainty in target volume delineation for lung cancer radiotherapy. MATERIALS AND METHODS Data from two lung cancer target volume delineation courses were analysed. In total, 22 trainees in clinical oncology working across different UK centres attended these courses with priori experience in lung cancer radiotherapy. The courses were made up of short presentations and contouring practice sessions. The participants were divided into two groups and asked to first individually delineate (IND) and then individually peer review (IPR) the contours of another participant. The contours were discussed with an expert panel consisting of two consultant clinical oncologists and a consultant radiologist. Contours were analysed quantitatively by measuring the volume and local distance standard deviation (localSD) from the reference expert consensus contour and qualitatively through visual analysis. Feedback from the participants was obtained using a questionnaire. RESULTS All participants applied minor editing to the contours during IPR, leading to a non-statistically significant reduction in the mean delineated volume (IND = 140.92 cm3, IPR = 125.26 cm3, P = 0.211). The overall interobserver variation was similar, with a localSD of 0.33 cm and 0.38 cm for the IND and IPR, respectively (P = 0.848). Six participants (29%) carried out correct major changes by either including tumour or excluding healthy tissue. One participant (5%) carried out an incorrect edit by excluding parts of the tumour, while another observer failed to identify a major contour error. The participants' level of confidence in target volume delineation increased following the course and identified the discussions with the radiologist and colleagues as the most important highlights of the course. CONCLUSION IPR could improve target volume delineation quality among trainee oncologists by identifying most major contour errors. However, errors were also introduced after IPR, suggesting the need to further discuss major changes with a multidisciplinary team.
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Affiliation(s)
- S Mercieca
- Faculty of Health Science, University of Malta, Msida, Malta; Faculty of Medicine (AMC), University of Amsterdam, Amsterdam, The Netherlands.
| | - S Pan
- Department of Clinical Oncology, The Christie NHS Foundation Trust, Manchester, UK
| | - J Belderbos
- Department of Radiation Oncology, Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - A Salem
- Department of Clinical Oncology, The Christie NHS Foundation Trust, Manchester, UK; University of Manchester, Manchester Academic Health Centre, The Christie NHS Foundation Trust, Manchester, UK
| | - S Tenant
- Department of Clinical Oncology, The Christie NHS Foundation Trust, Manchester, UK
| | - M C Aznar
- University of Manchester, Manchester Academic Health Centre, The Christie NHS Foundation Trust, Manchester, UK
| | - D Woolf
- Department of Radiation Oncology, Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - G Radhakrishna
- Department of Clinical Oncology, The Christie NHS Foundation Trust, Manchester, UK
| | - M van Herk
- University of Manchester, Manchester Academic Health Centre, The Christie NHS Foundation Trust, Manchester, UK
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Shortall J, Vasquez Osorio E, Aitkenhead A, Berresford J, Agnew J, Budgell G, Chuter R, McWilliam A, Kirkby K, Mackay R, van Herk M. Experimental verification the electron return effect around spherical air cavities for the MR-Linac using Monte Carlo calculation. Med Phys 2020; 47:2506-2515. [PMID: 32145087 DOI: 10.1002/mp.14123] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Revised: 02/28/2020] [Accepted: 02/28/2020] [Indexed: 11/10/2022] Open
Abstract
PURPOSE Dose deposition around unplanned air cavities during magnetic resonance-guided radiotherapy (MRgRT) is influenced by the electron return effect (ERE). This is clinically relevant for gas forming close to or inside organs at risk (OARs) that lie in the path of a single beam, for example, intestinal track during pelvic treatment. This work aims to verify Monte Carlo calculations that predict the dosimetric effects of ERE around air cavities. For this, we use GafChromic EBT3 film inside poly-methyl methacrylate (PMMA) -air phantoms. METHOD Four PMMA phantoms were produced. Three of the phantoms contained centrally located spherical air cavities (0.5, 3.5, 7.5 cm diameter), and one phantom contained no air. The phantoms were split to sandwich GafChromic EBT3 film in the center. The phantoms were irradiated on an Elekta Unity system using a single 10 × 10 cm2 7-MV photon beam under the influence of a 1.5-T transverse magnetic field. The measurements were replicated using the Elekta Monaco treatment planning system (TPS). Gamma analysis with pass criteria 3%/3 mm was used to compare the measured and calculated dose distributions. We also consider 3%/2 mm, 2%/3 mm, and 2%/2 mm pass criteria for interest. RESULTS The gamma analysis showed that >95% of the points agreed between the TPS-calculated and measured dose distributions, using 3%/3 mm criteria. The phantom containing the largest air cavity had the lowest agreement, with most of the disagreeing points lying inside the air cavity (dose to air region). CONCLUSIONS The dose effects due to ERE around spherical air cavities are being calculated in the TPS with sufficient accuracy for clinical use.
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Affiliation(s)
- J Shortall
- Department of Cancer Sciences, The University of Manchester, Manchester, UK
| | - E Vasquez Osorio
- Department of Cancer Sciences, The University of Manchester, Manchester, UK
| | - A Aitkenhead
- Department of Cancer Sciences, The University of Manchester, Manchester, UK
- Department of Medical Physics and Engineering, The Christie NHS Foundation Trust, Manchester, UK
| | - J Berresford
- Department of Medical Physics and Engineering, The Christie NHS Foundation Trust, Manchester, UK
| | - J Agnew
- Department of Medical Physics and Engineering, The Christie NHS Foundation Trust, Manchester, UK
| | - G Budgell
- Department of Cancer Sciences, The University of Manchester, Manchester, UK
- Department of Medical Physics and Engineering, The Christie NHS Foundation Trust, Manchester, UK
| | - R Chuter
- Department of Cancer Sciences, The University of Manchester, Manchester, UK
- Department of Medical Physics and Engineering, The Christie NHS Foundation Trust, Manchester, UK
| | - A McWilliam
- Department of Cancer Sciences, The University of Manchester, Manchester, UK
- Department of Medical Physics and Engineering, The Christie NHS Foundation Trust, Manchester, UK
| | - K Kirkby
- Department of Cancer Sciences, The University of Manchester, Manchester, UK
- Department of Medical Physics and Engineering, The Christie NHS Foundation Trust, Manchester, UK
| | - R Mackay
- Department of Cancer Sciences, The University of Manchester, Manchester, UK
- Department of Medical Physics and Engineering, The Christie NHS Foundation Trust, Manchester, UK
| | - M van Herk
- Department of Cancer Sciences, The University of Manchester, Manchester, UK
- Department of Medical Physics and Engineering, The Christie NHS Foundation Trust, Manchester, UK
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Mercieca S, Belderbos J, Gilson D, Dickson J, Pan S, van Herk M. Implementing the Royal College of Radiologists' Radiotherapy Target Volume Definition and Peer Review Guidelines: More Still To Do? Clin Oncol (R Coll Radiol) 2019; 31:706-710. [DOI: 10.1016/j.clon.2019.07.021] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 07/24/2019] [Accepted: 07/29/2019] [Indexed: 12/25/2022]
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Bartel F, Visser M, de Ruiter M, Belderbos J, Barkhof F, Vrenken H, de Munck JC, van Herk M. Non-linear registration improves statistical power to detect hippocampal atrophy in aging and dementia. Neuroimage Clin 2019; 23:101902. [PMID: 31233953 PMCID: PMC6595082 DOI: 10.1016/j.nicl.2019.101902] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Revised: 05/01/2019] [Accepted: 06/16/2019] [Indexed: 12/25/2022]
Abstract
OBJECTIVE To compare the performance of different methods for determining hippocampal atrophy rates using longitudinal MRI scans in aging and Alzheimer's disease (AD). BACKGROUND Quantifying hippocampal atrophy caused by neurodegenerative diseases is important to follow the course of the disease. In dementia, the efficacy of new therapies can be partially assessed by measuring their effect on hippocampal atrophy. In radiotherapy, the quantification of radiation-induced hippocampal volume loss is of interest to quantify radiation damage. We evaluated plausibility, reproducibility and sensitivity of eight commonly used methods to determine hippocampal atrophy rates using test-retest scans. MATERIALS AND METHODS Manual, FSL-FIRST, FreeSurfer, multi-atlas segmentation (MALF) and non-linear registration methods (Elastix, NiftyReg, ANTs and MIRTK) were used to determine hippocampal atrophy rates on longitudinal T1-weighted MRI from the ADNI database. Appropriate parameters for the non-linear registration methods were determined using a small training dataset (N = 16) in which two-year hippocampal atrophy was measured using test-retest scans of 8 subjects with low and 8 subjects with high atrophy rates. On a larger dataset of 20 controls, 40 mild cognitive impairment (MCI) and 20 AD patients, one-year hippocampal atrophy rates were measured. A repeated measures ANOVA analysis was performed to determine differences between controls, MCI and AD patients. For each method we calculated effect sizes and the required sample sizes to detect one-year volume change between controls and MCI (NCTRL_MCI) and between controls and AD (NCTRL_AD). Finally, reproducibility of hippocampal atrophy rates was assessed using within-session rescans and expressed as an average distance measure DAve, which expresses the difference in atrophy rate, averaged over all subjects. The same DAve was used to determine the agreement between different methods. RESULTS Except for MALF, all methods detected a significant group difference between CTRL and AD, but none could find a significant difference between the CTRL and MCI. FreeSurfer and MIRTK required the lowest sample sizes (FreeSurfer: NCTRL_MCI = 115, NCTRL_AD = 17 with DAve = 3.26%; MIRTK: NCTRL_MCI = 97, NCTRL_AD = 11 with DAve = 3.76%), while ANTs was most reproducible (NCTRL_MCI = 162, NCTRL_AD = 37 with DAve = 1.06%), followed by Elastix (NCTRL_MCI = 226, NCTRL_AD = 15 with DAve = 1.78%) and NiftyReg (NCTRL_MCI = 193, NCTRL_AD = 14 with DAve = 2.11%). Manually measured hippocampal atrophy rates required largest sample sizes to detect volume change and were poorly reproduced (NCTRL_MCI = 452, NCTRL_AD = 87 with DAve = 12.39%). Atrophy rates of non-linear registration methods also agreed best with each other. DISCUSSION AND CONCLUSION Non-linear registration methods were most consistent in determining hippocampal atrophy and because of their better reproducibility, methods, such as ANTs, Elastix and NiftyReg, are preferred for determining hippocampal atrophy rates on longitudinal MRI. Since performances of non-linear registration methods are well comparable, the preferred method would mostly depend on computational efficiency.
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Affiliation(s)
- F Bartel
- Department of Radiology and Nuclear Medicine, VU University Medical Center, Amsterdam, the Netherlands.
| | - M Visser
- Department of Radiology and Nuclear Medicine, VU University Medical Center, Amsterdam, the Netherlands
| | - M de Ruiter
- Division of Psychosocial Research and Epidemiology, Netherlands Cancer Institute, Amsterdam, the Netherlands
| | - J Belderbos
- Department of Radiotherapy, Netherlands Cancer Institute, Amsterdam, the Netherlands
| | - F Barkhof
- Department of Radiology and Nuclear Medicine, VU University Medical Center, Amsterdam, the Netherlands; UCL institutes of Neurology and healthcare engineering, London, United Kingdom
| | - H Vrenken
- Department of Radiology and Nuclear Medicine, VU University Medical Center, Amsterdam, the Netherlands
| | - J C de Munck
- Department of Radiology and Nuclear Medicine, VU University Medical Center, Amsterdam, the Netherlands
| | - M van Herk
- Manchester Cancer Research Centre, Division of Cancer Science, School of Medical Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester Academic Health Sciences Centre, Manchester, United Kingdom
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Hague C, Beasley W, Green A, Garcez K, Lee L, Maranzano M, McPartlin A, Mullan D, Sykes A, Thomson D, van Herk M, West C, Slevin N. Evaluation of a Novel Atlas to Reduce Variability of Contouring Masticatory Muscles in Head and Neck Cancer Patients. Int J Radiat Oncol Biol Phys 2018. [DOI: 10.1016/j.ijrobp.2018.07.858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Bartel F, van Herk M, Vrenken H, Vandaele F, Sunaert S, de Jaeger K, Dollekamp NJ, Carbaat C, Lamers E, Dieleman EMT, Lievens Y, de Ruysscher D, Schagen SB, de Ruiter MB, de Munck JC, Belderbos J. Inter-observer variation of hippocampus delineation in hippocampal avoidance prophylactic cranial irradiation. Clin Transl Oncol 2018; 21:178-186. [PMID: 29876759 DOI: 10.1007/s12094-018-1903-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Accepted: 05/24/2018] [Indexed: 01/22/2023]
Abstract
BACKGROUND Hippocampal avoidance prophylactic cranial irradiation (HA-PCI) techniques have been developed to reduce radiation damage to the hippocampus. An inter-observer hippocampus delineation analysis was performed and the influence of the delineation variability on dose to the hippocampus was studied. MATERIALS AND METHODS For five patients, seven observers delineated both hippocampi on brain MRI. The intra-class correlation (ICC) with absolute agreement and the generalized conformity index (CIgen) were computed. Median surfaces over all observers' delineations were created for each patient and regional outlining differences were analysed. HA-PCI dose plans were made from the median surfaces and we investigated whether dose constraints in the hippocampus could be met for all delineations. RESULTS The ICC for the left and right hippocampus was 0.56 and 0.69, respectively, while the CIgen ranged from 0.55 to 0.70. The posterior and anterior-medial hippocampal regions had most variation with SDs ranging from approximately 1 to 2.5 mm. The mean dose (Dmean) constraint was met for all delineations, but for the dose received by 1% of the hippocampal volume (D1%) violations were observed. CONCLUSION The relatively low ICC and CIgen indicate that delineation variability among observers for both left and right hippocampus was large. The posterior and anterior-medial border have the largest delineation inaccuracy. The hippocampus Dmean constraint was not violated.
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Affiliation(s)
- F Bartel
- Department of Radiology and Nuclear Medicine, VU University Medical Center, Amsterdam, The Netherlands
| | - M van Herk
- Department of Cancer Sciences, University of Manchester, Manchester, UK
| | - H Vrenken
- Department of Radiology and Nuclear Medicine, VU University Medical Center, Amsterdam, The Netherlands
| | - F Vandaele
- Department of Radiotherapy, Iridium Cancer Network, Antwerp, Belgium
| | - S Sunaert
- Department of Radiology, University Hospitals Leuven, Louvain, Belgium
| | - K de Jaeger
- Department of Radiotherapy, Catharina Hospital, Eindhoven, The Netherlands
| | - N J Dollekamp
- Department of Radiotherapy, The University Medical Center Groningen, Groningen, The Netherlands
| | - C Carbaat
- Department of Radiotherapy, Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX, Amsterdam, The Netherlands
| | - E Lamers
- Department of Radiotherapy, Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX, Amsterdam, The Netherlands
| | - E M T Dieleman
- Department of Radiotherapy, Academic Medical Center, Amsterdam, The Netherlands
| | - Y Lievens
- Department of Radiation Oncology, Ghent University Hospital, Ghent, Belgium
| | - D de Ruysscher
- Department of Radiotherapy, Maastricht University Medical Center, Maastricht, The Netherlands
| | - S B Schagen
- Division of Psychosocial Research and Epidemiology, Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - M B de Ruiter
- Division of Psychosocial Research and Epidemiology, Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - J C de Munck
- Department of Radiology and Nuclear Medicine, VU University Medical Center, Amsterdam, The Netherlands
| | - J Belderbos
- Department of Radiotherapy, Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX, Amsterdam, The Netherlands.
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McWilliam A, Lee L, Harris M, Sheikh H, Pemberton L, Faivre-Finn C, van Herk M. Benefit of using motion compensated reconstructions for reducing inter-observer and intra-observer contouring variation for organs at risk in lung cancer patients. Radiother Oncol 2017; 126:333-338. [PMID: 29221648 DOI: 10.1016/j.radonc.2017.11.021] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Revised: 11/08/2017] [Accepted: 11/22/2017] [Indexed: 10/18/2022]
Abstract
BACKGROUND AND PURPOSE In lung cancer patients, accuracy in contouring is hampered by image artefacts introduced by respiratory motion. With the widespread introduction of 4DCT there is additional uncertainty caused by the use of different reconstruction techniques which will influence contour definition. This work aims to assess both inter- and intra-observer contour variation on average and motion compensated (mid-position) reconstructions. MATERIAL AND METHODS Eight early stage non-small cell lung cancer patients that received 4DCT were selected and these scans were reconstructed as average and motion compensated datasets. 5 observers contoured the organs at risk (trachea, oesophagus, proximal bronchial tree, heart and brachial plexus) for each patient and each reconstruction. Contours were compared against a STAPLE volume with distance to agreement metrics. Intra-observer variation was assessed by redelineation after 4 months. RESULTS The inter-observer variation was significantly smaller using the motion compensated datasets for the trachea (p = 0.006) and proximal bronchial tree (p = 0.004). For intra-observer variation, a reduction in contour variation was seen across all organs at risk in using motion compensated reconstructions. CONCLUSIONS This work shows that there is benefit in using motion compensated reconstructions for reducing both inter-observer and intra-observer contouring variations for organs at risk in lung cancer patients.
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Affiliation(s)
- A McWilliam
- Division of Cancer Sciences, School of Medical Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester Academic Health Science Centre, UK; Department of Radiotherapy Related Research, The Christie NHS Foundation Trust, Manchester, UK.
| | - L Lee
- Department of Clinical Oncology, The Christie NHS Foundation Trust, Manchester, UK
| | - M Harris
- Department of Clinical Oncology, The Christie NHS Foundation Trust, Manchester, UK
| | - H Sheikh
- Department of Clinical Oncology, The Christie NHS Foundation Trust, Manchester, UK
| | - L Pemberton
- Department of Clinical Oncology, The Christie NHS Foundation Trust, Manchester, UK
| | - C Faivre-Finn
- Division of Cancer Sciences, School of Medical Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester Academic Health Science Centre, UK; Department of Radiotherapy Related Research, The Christie NHS Foundation Trust, Manchester, UK
| | - M van Herk
- Division of Cancer Sciences, School of Medical Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester Academic Health Science Centre, UK; Department of Radiotherapy Related Research, The Christie NHS Foundation Trust, Manchester, UK
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Price G, van Herk M, Faivre-Finn C. Data Mining in Oncology: The ukCAT Project and the Practicalities of Working with Routine Patient Data. Clin Oncol (R Coll Radiol) 2017; 29:814-817. [DOI: 10.1016/j.clon.2017.07.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Revised: 06/28/2017] [Accepted: 07/08/2017] [Indexed: 11/28/2022]
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