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Klinge T, Talbot H, Paddick I, Ourselin S, McClelland JR, Modat M. Toward semi-automatic biologically effective dose treatment plan optimisation for Gamma Knife radiosurgery. Phys Med Biol 2022; 67:215001. [PMID: 35961305 PMCID: PMC10518700 DOI: 10.1088/1361-6560/ac8965] [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: 11/09/2021] [Revised: 07/26/2022] [Accepted: 08/12/2022] [Indexed: 11/12/2022]
Abstract
Objective.Dose-rate effects in Gamma Knife radiosurgery treatments can lead to varying biologically effective dose (BED) levels for the same physical dose. The non-convex BED model depends on the delivery sequence and creates a non-trivial treatment planning problem. We investigate the feasibility of employing inverse planning methods to generate treatment plans exhibiting desirable BED characteristics using the per iso-centre beam-on times and delivery sequence.Approach.We implement two dedicated optimisation algorithms. One approach relies on mixed-integer linear programming (MILP) using a purposely developed convex underestimator for the BED to mitigate local minima issues at the cost of computational complexity. The second approach (local optimisation) is faster and potentially usable in a clinical setting but more prone to local minima issues. It sequentially executes the beam-on time (quasi-Newton method) and sequence optimisation (local search algorithm). We investigate the trade-off between time to convergence and solution quality by evaluating the resulting treatment plans' objective function values and clinical parameters. We also study the treatment time dependence of the initial and optimised plans using BED95(BED delivered to 95% of the target volume) values.Main results.When optimising the beam-on times and delivery sequence, the local optimisation approach converges several orders of magnitude faster than the MILP approach (minutes versus hours-days) while typically reaching within 1.2% (0.02-2.08%) of the final objective function value. The quality parameters of the resulting treatment plans show no meaningful difference between the local and MILP optimisation approaches. The presented optimisation approaches remove the treatment time dependence observed in the original treatment plans, and the chosen objectives successfully promote more conformal treatments.Significance.We demonstrate the feasibility of using an inverse planning approach within a reasonable time frame to ensure BED-based objectives are achieved across varying treatment times and highlight the prospect of further improvements in treatment plan quality.
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Affiliation(s)
- Thomas Klinge
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences (WEISS), Dept. Medical Physics and Biomedical Engineering, University College London, London, United Kingdom
- Centre for Medical Image Computing, Dept. Medical Physics and Biomedical Engineering, University College London, London, United Kingdom
- School of Biomedical Engineering & Imaging Sciences, King’s College London, London, United Kingdom
| | - Hugues Talbot
- CentraleSupélec, Université Paris-Saclay, Inria, Gif-sur-Yvette, France
| | - Ian Paddick
- Queen Square Gamma Knife Centre, National Hospital for Neurology and Neurosurgery, London, United Kingdom
| | - Sébastien Ourselin
- School of Biomedical Engineering & Imaging Sciences, King’s College London, London, United Kingdom
| | - Jamie R McClelland
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences (WEISS), Dept. Medical Physics and Biomedical Engineering, University College London, London, United Kingdom
- Centre for Medical Image Computing, Dept. Medical Physics and Biomedical Engineering, University College London, London, United Kingdom
| | - Marc Modat
- School of Biomedical Engineering & Imaging Sciences, King’s College London, London, United Kingdom
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Hopewell JW, Paddick I, Jones B, Klinge T. Letter to the Editor. Biologically effective dose and the treatment of AVMs. J Neurosurg 2021; 134:2007-2008. [PMID: 33482636 DOI: 10.3171/2020.9.jns203545] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- John W Hopewell
- 6Green Templeton College, University of Oxford, United Kingdom
| | - Ian Paddick
- 7Gamma Knife Centre, National Hospital for Neurology and Neurosurgery, London, United Kingdom
| | - Bleddyn Jones
- 6Green Templeton College, University of Oxford, United Kingdom.,8Gray Laboratory, CRUK/MRC Oxford Institute for Radiation Oncology, University of Oxford, United Kingdom
| | - Thomas Klinge
- 9Wellcome/EPSRC Centre for Interventional and Surgical Sciences, University College London, United Kingdom.,10Centre for Medical Image Computing, University College London, United Kingdom
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Klinge T, Modat M, McClelland JR, Dimitriadis A, Paddick I, Hopewell JW, Walton L, Rowe J, Kitchen N, Ourselin S. The impact of unscheduled gaps and iso-centre sequencing on the biologically effective dose in Gamma Knife radiosurgery. J Radiosurg SBRT 2021; 7:213-221. [PMID: 33898085 PMCID: PMC8055240] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Accepted: 12/21/2020] [Indexed: 11/01/2022]
Abstract
PURPOSE Establish the impact of iso-centre sequencing and unscheduled gaps in Gamma Knife® (GK) radiosurgery on the biologically effective dose (BED). METHODS A BED model was used to study BED values on the prescription iso-surface of patients treated with GK Perfexion™ (Vestibular Schwannoma). The effect of a 15 min gap, simulated at varying points in the treatment delivery, and adjustments to the sequencing of iso-centre delivery, based on average dose-rate, was quantified in terms of the impact on BED. RESULTS Depending on the position of the gap and the average dose-rate profiles, the mean BED values were decreased by 0.1% to 9.9% of the value in the original plan. A heuristic approach to iso-centre sequencing showed variations in BED of up to 14.2%, relative to the mean BED of the original sequence. CONCLUSION The treatment variables, like the iso-centre sequence and unscheduled gaps, should be considered during GK radiosurgery treatments.
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Affiliation(s)
- Thomas Klinge
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences (WEISS), Dept. Medical Physics and Biomedical Engineering, University College London, London, UK, Centre for Medical Image Computing, Dept. Medical Physics and Biomedical Engineering, University College London, London, UK, School of Biomedical Engineering & Imaging Sciences, King’s College London, London, UK
| | - Marc Modat
- School of Biomedical Engineering & Imaging Sciences, King’s College London, London, UK
| | - Jamie R. McClelland
- Centre for Medical Image Computing, Dept. Medical Physics and Biomedical Engineering, University College London, London, UK
| | - Alexis Dimitriadis
- Queen Square Gamma Knife Centre, National Hospital for Neurology and Neurosurgery, London, UK
| | - Ian Paddick
- Queen Square Gamma Knife Centre, National Hospital for Neurology and Neurosurgery, London, UK
| | | | - Lee Walton
- The National Centre for Stereotactic Radiosurgery, Royal Hallamshire Hospital, Sheffield, UK
| | - Jeremy Rowe
- The National Centre for Stereotactic Radiosurgery, Royal Hallamshire Hospital, Sheffield, UK
| | - Neil Kitchen
- Victor Horsley Department of Neurosurgery, National Hospital Queen Square, UCLH Trust, London, UK
| | - Sébastien Ourselin
- School of Biomedical Engineering & Imaging Sciences, King’s College London, London, UK
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Jones B, Klinge T, Hopewell JW. The influence of the α/β ratio on treatment time iso-effect relationships in the central nervous system. Int J Radiat Biol 2020; 96:903-909. [PMID: 32243225 DOI: 10.1080/09553002.2020.1748736] [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] [Indexed: 10/24/2022]
Abstract
Purpose: To investigate the influence of changes in α/β ratio (range 1.5-3 Gy) on iso-effective doses, with varying treatment time, in spinal cord and central nervous system tissues with comparable radio-sensitivity. It is important to establish if an α/β ratio of 2 Gy, the accepted norm for neuro-oncology iso-effect estimations, can be used.Methods: The rat spinal cord irradiation data of Pop et al. provided ED50 values for radiation myelopathy for treatment times that varied from minutes to ∼6 days. Analysis using biphasic repair kinetics, allowing for variable dose-rates, provided the best fit with repair half-times of 0.19 and 2.16 hr, each providing ∼50% of overall repair; with an α/β ratio 2.47 Gy (CI 1.5-3.95 Gy). Using the above data set, graphical methods were used to investigate changes in the repair parameters for differing fixed α/β ratios between 1.5 and 3.0 Gy. Two different intermittent dose delivery equations were used to evaluate the implications in a radiosurgery setting.Results: Changes in the α/β ratio (1.5-3.0 Gy) have a minor effect on equivalent doses for radiation myelopathy for treatment durations of a few hours. Changing the α/β value from 2 Gy to 2.47 Gy, modified equivalent single doses by < 1% when overall treatment times ranged from 0.1 to 5.0 hr. Significant changes were only found for treatment times longer than 5-10 hr. These two α/β ratios were also compared in a practical radiosurgery situation, using two different models for estimating BED, again there was no significant loss of accuracy.Conclusions: It is reasonable to use an α/β ratio of 2 Gy for CNS tissue, with the same repair half-times as published in the original publication by Pop et al., in situations where the assessment of the BED in radiosurgery is used with other form of radiotherapy. In radiosurgery, the variation in BED with treatment duration (for a fixed physical dose) is very similar, but absolute BED values depend on the α/β value. In radiosurgery, clinical recommendations obtained using BED calculations using the originally proposed α/β ratio of 2.47 Gy are still appropriate. For calculations involving a combination of radiosurgery and other modalities, such as fractionated radiotherapy, it would be appropriate in all cases to apply a value of 2 Gy, the accepted norm in neuro-oncology, without significant loss of accuracy in the radio-surgical component. This may have important applications in retreatment situations.
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Affiliation(s)
- Bleddyn Jones
- Gray Laboratory, Department of Oncology, University of Oxford, Oxford, UK.,Green Templeton College, University of Oxford, Oxford, UK
| | - Thomas Klinge
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences, Department Medical Physics and Biomedical Engineering, University College London, London, UK.,Centre for Medical Image Computing, Department Medical Physics and Biomedical Engineering, University College London, London, UK.,School of Biomedical Engineering and Imaging Sciences, King's College London, London, UK
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Paddick I, Hopewell JW, Klinge T, Graffeo CS, Pollock BE, Sneed PK. Letter: Treatment Outcomes and Dose Rate Effects Following Gamma Knife Stereotactic Radiosurgery for Vestibular Schwannomas. Neurosurgery 2019; 86:E407-E409. [DOI: 10.1093/neuros/nyz547] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Ian Paddick
- Queen Square Gamma Knife Centre National Hospital for Neurology and Neurosurgery London, United Kingdom
| | - John W Hopewell
- Green Templeton College University of Oxford Oxford, United Kingdom
| | - Thomas Klinge
- Wellcome/EPSRC Centre for Interventional and Surgical Sciences Department Medical Physics and Biomedical Engineering University College London London, United Kingdom
- Centre for Medical Image Computing Department Medical Physics and Biomedical Engineering University College London London, United Kingdom
- School of Biomedical Engineering & Imaging Sciences King's College London London, United Kingdom
| | | | - Bruce E Pollock
- Department of Neurosurgery Mayo Clinic and Foundation Rochester, Minnesota
| | - Penny K Sneed
- Department of Radiation Oncology University of California San Francisco San Francisco, California
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Wieser HP, Cisternas E, Wahl N, Ulrich S, Stadler A, Mescher H, Müller LR, Klinge T, Gabrys H, Burigo L, Mairani A, Ecker S, Ackermann B, Ellerbrock M, Parodi K, Jäkel O, Bangert M. Development of the open-source dose calculation and optimization toolkit matRad. Med Phys 2017; 44:2556-2568. [DOI: 10.1002/mp.12251] [Citation(s) in RCA: 123] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Revised: 03/15/2017] [Accepted: 03/17/2017] [Indexed: 11/06/2022] Open
Affiliation(s)
- Hans-Peter Wieser
- Department of Medical Physics in Radiation Oncology; German Cancer Research Center-DKFZ; Im Neuenheimer Feld 280 D-69120 Heidelberg Germany
| | - Eduardo Cisternas
- Department of Medical Physics in Radiation Oncology; German Cancer Research Center-DKFZ; Im Neuenheimer Feld 280 D-69120 Heidelberg Germany
- Department of Medical Physics in Radiation Oncology; Heidelberg Institute for Radiation Oncology-HIRO; Im Neuenheimer Feld 280 D-69120 Heidelberg Germany
| | - Niklas Wahl
- Department of Medical Physics in Radiation Oncology; German Cancer Research Center-DKFZ; Im Neuenheimer Feld 280 D-69120 Heidelberg Germany
- Department of Medical Physics in Radiation Oncology; Heidelberg Institute for Radiation Oncology-HIRO; Im Neuenheimer Feld 280 D-69120 Heidelberg Germany
| | - Silke Ulrich
- Department of Medical Physics in Radiation Oncology; German Cancer Research Center-DKFZ; Im Neuenheimer Feld 280 D-69120 Heidelberg Germany
- Department of Medical Physics in Radiation Oncology; Heidelberg Institute for Radiation Oncology-HIRO; Im Neuenheimer Feld 280 D-69120 Heidelberg Germany
| | - Alexander Stadler
- Department of Medical Physics in Radiation Oncology; German Cancer Research Center-DKFZ; Im Neuenheimer Feld 280 D-69120 Heidelberg Germany
- Department of Medical Physics in Radiation Oncology; Heidelberg Institute for Radiation Oncology-HIRO; Im Neuenheimer Feld 280 D-69120 Heidelberg Germany
| | - Henning Mescher
- Department of Medical Physics in Radiation Oncology; German Cancer Research Center-DKFZ; Im Neuenheimer Feld 280 D-69120 Heidelberg Germany
- Department of Medical Physics in Radiation Oncology; Heidelberg Institute for Radiation Oncology-HIRO; Im Neuenheimer Feld 280 D-69120 Heidelberg Germany
| | - Lucas-Raphael Müller
- Department of Medical Physics in Radiation Oncology; German Cancer Research Center-DKFZ; Im Neuenheimer Feld 280 D-69120 Heidelberg Germany
- Department of Medical Physics in Radiation Oncology; Heidelberg Institute for Radiation Oncology-HIRO; Im Neuenheimer Feld 280 D-69120 Heidelberg Germany
| | - Thomas Klinge
- Department of Medical Physics in Radiation Oncology; German Cancer Research Center-DKFZ; Im Neuenheimer Feld 280 D-69120 Heidelberg Germany
- Department of Medical Physics in Radiation Oncology; Heidelberg Institute for Radiation Oncology-HIRO; Im Neuenheimer Feld 280 D-69120 Heidelberg Germany
| | - Hubert Gabrys
- Department of Medical Physics in Radiation Oncology; German Cancer Research Center-DKFZ; Im Neuenheimer Feld 280 D-69120 Heidelberg Germany
- Department of Medical Physics in Radiation Oncology; Heidelberg Institute for Radiation Oncology-HIRO; Im Neuenheimer Feld 280 D-69120 Heidelberg Germany
| | - Lucas Burigo
- Department of Medical Physics in Radiation Oncology; German Cancer Research Center-DKFZ; Im Neuenheimer Feld 280 D-69120 Heidelberg Germany
- Department of Medical Physics in Radiation Oncology; Heidelberg Institute for Radiation Oncology-HIRO; Im Neuenheimer Feld 280 D-69120 Heidelberg Germany
| | - Andrea Mairani
- Department of Medical Physics in Radiation Oncology; Heidelberg Institute for Radiation Oncology-HIRO; Im Neuenheimer Feld 280 D-69120 Heidelberg Germany
- Department of Medical Physics in Radiation Oncology; Heidelberg Ion Beam Therapy Center-HIT; Im Neuenheimer Feld 450 D-69120 Heidelberg Germany
| | - Swantje Ecker
- Department of Medical Physics in Radiation Oncology; Heidelberg Institute for Radiation Oncology-HIRO; Im Neuenheimer Feld 280 D-69120 Heidelberg Germany
- Department of Medical Physics in Radiation Oncology; Heidelberg Ion Beam Therapy Center-HIT; Im Neuenheimer Feld 450 D-69120 Heidelberg Germany
| | - Benjamin Ackermann
- Department of Medical Physics in Radiation Oncology; Heidelberg Institute for Radiation Oncology-HIRO; Im Neuenheimer Feld 280 D-69120 Heidelberg Germany
- Department of Medical Physics in Radiation Oncology; Heidelberg Ion Beam Therapy Center-HIT; Im Neuenheimer Feld 450 D-69120 Heidelberg Germany
| | - Malte Ellerbrock
- Department of Medical Physics in Radiation Oncology; Heidelberg Institute for Radiation Oncology-HIRO; Im Neuenheimer Feld 280 D-69120 Heidelberg Germany
- Department of Medical Physics in Radiation Oncology; Heidelberg Ion Beam Therapy Center-HIT; Im Neuenheimer Feld 450 D-69120 Heidelberg Germany
| | - Katia Parodi
- Department of Medical Physics in Radiation Oncology; Heidelberg Institute for Radiation Oncology-HIRO; Im Neuenheimer Feld 280 D-69120 Heidelberg Germany
- Department of Medical Physics in Radiation Oncology; Heidelberg Ion Beam Therapy Center-HIT; Im Neuenheimer Feld 450 D-69120 Heidelberg Germany
- Department of Medical Physics in Radiation Oncology; Ludwig-Maximilians-Universität München; Am Coulombwall 1 D-85748 Garching Germany
| | - Oliver Jäkel
- Department of Medical Physics in Radiation Oncology; German Cancer Research Center-DKFZ; Im Neuenheimer Feld 280 D-69120 Heidelberg Germany
- Department of Medical Physics in Radiation Oncology; Heidelberg Institute for Radiation Oncology-HIRO; Im Neuenheimer Feld 280 D-69120 Heidelberg Germany
- Department of Medical Physics in Radiation Oncology; Heidelberg Ion Beam Therapy Center-HIT; Im Neuenheimer Feld 450 D-69120 Heidelberg Germany
| | - Mark Bangert
- Department of Medical Physics in Radiation Oncology; German Cancer Research Center-DKFZ; Im Neuenheimer Feld 280 D-69120 Heidelberg Germany
- Department of Medical Physics in Radiation Oncology; Heidelberg Institute for Radiation Oncology-HIRO; Im Neuenheimer Feld 280 D-69120 Heidelberg Germany
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Abstract
Two cases of hepatic hemangiomas are described diagnosed by angiography and controlled by repeat angiography after 2.5 and 6 years, respectively. The radiologic appearance is described and although it varies, angiography must be considered the safest method of diagnosis; biopsy is contraindicated. Steroid therapy seems to be a possible mode of treatment.
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Abstract
A family with 3 cases of pulmonary stenosis with underdeveloped or normal right ventricle is described. In the family there have also been some spontaneous abortions and many infant deaths, and it seems possible that these were also related to congenital cardiac abnormalities. Recognized syndromes with pulmonary stenosis and reports on familial occurrence of this malformation are reviewed. The cases reported in this paper differ from these previously described syndromes. The possibility of sex-influenced monogenic inheritance is discussed.
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Klinge T, Jensen JH. [Hemangioma in children]. Ugeskr Laeger 1973; 135:2041-7. [PMID: 4590076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Therkelsen AJ, Klinge T, Henningsen K, Mikkelsen M, Schmidt G. A family with a presumptive C-F translocation in five generations. Ann Genet 1971; 14:13-21. [PMID: 5314290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Klinge T. [Gastroenteritis epidemic among newborns]. Ugeskr Laeger 1970; 132:2222-8. [PMID: 4922526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Klinge T, Therkelsen AJ. A family with a presumptive C-F translocation. Acta Paediatr Scand Suppl 1970; 206:Suppl 206:131+. [PMID: 5276949 DOI: 10.1111/j.1651-2227.1970.tb14652.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Aikema S, Dijkstra S, Lukens J, Holwerda F, Jansma F, Klinge T. [Pregnancy toxemias]. Tijdschr Ziekenverpl 1970; 23:490-3. [PMID: 5199937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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