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Lutz C, Knap M, Møller D, Hoffmann L, Khalil A, Håkansson K, Persson G, Bentzen S, Nygård L, Vogelius I. PD-0876 First-failure prediction model for locally advanced non-small cell lung cancer - External validation. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)07155-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Milo M, Nyeng T, Lorenzen E, Hoffmann L, Møller D, Offersen B. PO-1710 Atlas-based auto-segmentation for delineating the heart and cardiac substructures radiation therapy. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)08161-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Helk T, Berger E, Jamnuch S, Hoffmann L, Kabacinski A, Gautier J, Tissandier F, Goddet JP, Chang HT, Oh J, Pemmaraju CD, Pascal TA, Sebban S, Spielmann C, Zuerch M. Table-top extreme ultraviolet second harmonic generation. SCIENCE ADVANCES 2021; 7:7/21/eabe2265. [PMID: 34138744 PMCID: PMC8133706 DOI: 10.1126/sciadv.abe2265] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Accepted: 03/30/2021] [Indexed: 05/27/2023]
Abstract
The lack of available table-top extreme ultraviolet (XUV) sources with high enough fluxes and coherence properties has limited the availability of nonlinear XUV and x-ray spectroscopies to free-electron lasers (FELs). Here, we demonstrate second harmonic generation (SHG) on a table-top XUV source by observing SHG near the Ti M2,3 edge with a high-harmonic seeded soft x-ray laser. Furthermore, this experiment represents the first SHG experiment in the XUV. First-principles electronic structure calculations suggest the surface specificity and separate the observed signal into its resonant and nonresonant contributions. The realization of XUV-SHG on a table-top source opens up more accessible opportunities for the study of element-specific dynamics in multicomponent systems where surface, interfacial, and bulk-phase asymmetries play a driving role.
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Hoffmann L, Knap MM, Alber M, Møller DS. Optimal beam angle selection and knowledge-based planning significantly reduces radiotherapy dose to organs at risk for lung cancer patients. Acta Oncol 2021; 60:293-299. [PMID: 33306422 DOI: 10.1080/0284186x.2020.1856409] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
BACKGROUND Lung cancer patients struggle with high toxicity rates. This study investigates if IMRT plans with individually set beam angles or uni-lateral VMAT plans results in dose reduction to OARs. We investigate if introduction of a RapidPlan model leads to reduced dose to OARs. Finally, the model is validated prospectively. MATERIAL AND METHODS Seventy-four consecutive lung cancer patients treated with IMRT were included. For all patients, new IMRT plans were made by an experienced dose planner re-tuning beam angles aiming for minimized dose to the lungs and heart. Additionally, VMAT plans were made. The IMRT plans were selected as input for a RapidPlan model, which was used to generate 74 new IMRT plans. The new IMRT plans were used as input for a second RapidPlan model. This model was clinically implemented and used for generation of clinical treatment plans. Dosimetric parameters were compared using a Wilcoxon signed rank test or a 1-sided student's t-test. p < .05 was considered significant. RESULTS IMRT plans significantly reduced mean doses to lungs (MLD) and heart (MHD) by 1.6 Gy and 1.7 Gy in mean compared to VMAT plans. MLD was significantly (p < .001) reduced from 10.8 Gy to 9.4 Gy by using the second RapidPlan model. MHD was significantly (p < .001) reduced from 4.9 Gy to 3.9 Gy. The model was validated in prospectively collected treatment plans showing significantly lower MLD after the implementation of the second RapidPlan model. CONCLUSION Introduction of RapidPlan and beam angles selected based on the target and OARs position reduces dose to OARs.
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Nyeng TB, Møller DS, Farr K, Kramer S, Khalil AA, Grau C, Hoffmann L. A comparison of two methods for segmentation of functional volumes in radiotherapy planning of lung cancer patients. Acta Oncol 2021; 60:353-360. [PMID: 33522851 DOI: 10.1080/0284186x.2021.1877811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
BACKGROUND In radiotherapy (RT) of lung cancer, dose to functional lung (FL) volumes segmented with two different methods (perfusion SPECT (Q-SPECT) and 4D-CT (4D) ventilation (V)) have been shown to correlate with the incidence of radiation pneumonitis (RP). This study aims to compare the FL volumes identified by both methods. MATERIAL AND METHODS Thirty lung cancer patients had a 4D and Q-SPECT prior to treatment. Seventeen of these patients also had a ventilation SPECT (V-SPECT). FL sub-volumes were segmented automatically, using cut-off values. The volumes were compared in terms of overlap fraction (OF) relative to the minimal volume, and intersection fraction (IF) of the FL volume relative to the total lung volume (VLung). RESULTS Cut-off values suggested in literature for Q-SPECT and 4D-V resulted in volumes differing in size by a median 18% [6%;31%], and a median OF and IF of 0.48 [0.23;0.70] and 0.09 [0.02;0.25], respectively. Segmenting volumes of comparable size of about 1/3 of VLung (FL-m(1/3), m = method) resulted in a median OF and IF of 0.43 [0.23;0.58] and 0.12 [0.06;0.19], respectively. Twenty-five patients (83%) had a reasonable overlap between FL-Q(1/3) and FL-4D-V(1/3) volumes, with OF values above 0.33. IF increased significantly (p = .036) compared to using fixed cut-off values. Similarly, volumes of comparable size of about 1/3 VLung were produced for V-SPECT, and FL-Q(1/3), FL-V(1/3), and FL-4D-V(1/3) were compared. The overlaps and intersections of FL-V(1/3) with FL-Q(1/3) volumes were significantly (p<.001) larger than the corresponding overlaps and intersections of FL-Q(1/3) with FL-4D(1/3) and FL-V(1/3) with FL-4D(1/3). CONCLUSION The Q-SPECT and 4D-V methods do not segment entirely the same FL volumes. A reasonable overlap of the volumes along with the findings of other studies that both correlate to RP incidence, suggests that a combination of both volumes, e.g. using the IF, may be useful in RT treatment planning.
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Cabral BCA, Hoffmann L, Bottaro T, Costa PF, Ramos ALA, Coelho HSM, Villela-Nogueira CA, Ürményi TP, Faffe DS, Silva R. Circulating microRNAs associated with liver fibrosis in chronic hepatitis C patients. Biochem Biophys Rep 2020; 24:100814. [PMID: 33015376 PMCID: PMC7520427 DOI: 10.1016/j.bbrep.2020.100814] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2020] [Revised: 09/06/2020] [Accepted: 09/14/2020] [Indexed: 12/21/2022] Open
Abstract
A major challenge in hepatitis C research is the detection of early potential for progressive liver disease. MicroRNAs (miRNAs) are small RNAs that regulate gene expression and can be biomarkers of pathological processes. In this study, we compared circulating miRNAs identified in hepatitis C virus (HCV)-infected patients presenting two extremes of liver disease: mild/moderate fibrosis and cirrhosis. The patients in the cirrhosis group subsequently developed hepatocellular carcinoma (HCC). We identified 163 mature miRNAs in the mild/moderate fibrosis group and 171 in the cirrhosis group, with 144 in common to both groups. Differential expression analysis revealed 5 upregulated miRNAs and 2 downregulated miRNAs in the cirrhosis group relative to the mild/moderate fibrosis group. Functional analyses of regulatory networks (target gene and miRNA) identified gene categories involved in cell cycle biological processes and metabolic pathways related to cell cycle, cancer, and apoptosis. These results suggest that the differentially expressed circulating miRNAs observed in this work (miR-215-5p, miR-483-5p, miR-193b-3p, miR-34a-5p, miR-885-5p, miR-26b-5p and miR -197-3p) may be candidates for biomarkers in the prognosis of liver disease. Circulating miRNome was performed in patients infected with HCV-1a or 1b. Mature miRNAs were identified in patients with mild/moderate fibrosis and cirrhosis. Five upregulated and two downregulated miRNAs were observed in the cirrhosis group. Regulatory networks identified gene categories involved in cell cycle. A routine baseline circulating biomarkers detection can have a prognostic value.
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Hoffmann L, Beerwerth J, Greim D, Senker J, Sternemann C, Hiller W, Böhmer R. Reorientational dynamics of trimethoxyboroxine: A molecular glass former studied by dielectric spectroscopy and 11B nuclear magnetic resonance. J Chem Phys 2020; 152:034503. [PMID: 31968976 DOI: 10.1063/1.5129769] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In this work, trimethoxyboroxine (TMB) is identified as a small-molecule glass former. In its viscous liquid as well as glassy states, static and dynamic properties of TMB are explored using various techniques. It is found that, on average, the structure of the condensed TMB molecules deviates from threefold symmetry so that TMB's electric dipole moment is nonzero, thus rendering broadband dielectric spectroscopy applicable. This method reveals the super-Arrhenius dynamics that characterizes TMB above its glass transition, which occurs at about 204 K. To extend the temperature range in which the molecular dynamics can be studied, 11B nuclear magnetic resonance experiments are additionally carried out on rotating and stationary samples: Exploiting dynamic second-order shifts, spin-relaxation times, line shape effects, as well as stimulated-echo and two-dimensional exchange spectroscopy, a coherent picture regarding the dynamics of this glass former is gained.
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Liu M, Huang Y, Hoffmann L, Huang C, Chen P, Heng Y. High-Resolution Source Estimation of Volcanic Sulfur Dioxide Emissions Using Large-Scale Transport Simulations. LECTURE NOTES IN COMPUTER SCIENCE 2020. [PMCID: PMC7304025 DOI: 10.1007/978-3-030-50420-5_5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Münzner P, Hoffmann L, Böhmer R, Gainaru C. Deeply supercooled aqueous LiCl solution studied by frequency-resolved shear rheology. J Chem Phys 2019; 150:234505. [DOI: 10.1063/1.5100600] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
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Møller DS, Schmidt M, Ravkilde T, Poulsen P, Hansen J, Worm E, Schmidt H, Knap M, Safwat A, Rose H, Hoffmann L. PO-0974 Intra-fractional stability of Deep Inspiration Breath Hold during RT for lung and lymphoma cancer. Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)31394-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Byskov CS, Holm AIS, Korreman S, Hoffmann L, Nordsmark M, Møller DS. PO-0944 Proton therapy for esophageal cancer; variable relative biological effect and heart dose. Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)31364-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Hoffmann L, Knap M, Møller D. PO-0920 Knowledge-based planning significantly reduces dose to organs at risk for lung cancer. Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)31340-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Persson G, Schytte T, Appelt A, Borissova S, Brink C, Hansen T, Hoffmann L, Josipovic M, Khalil A, Knap M, Lund M, Lutz C, Møller D, Nielsen T, Nielsen M, Ottosson W, Pøhl M, Thomsen J, Hansen O. EP-1352 Locally advanced NSCLC: performance status based eligibility for adjuvant check point inhibitor. Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)31772-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Nyeng T, Hoffmann L, Farr K, Khalil A, Grau C, Møller D. PV-0313 Ventilation functional lung volumes obtained from SPECT and 4D-CT do not identify the same voxels. Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)30733-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Mortensen H, Nordsmark M, Møller D, Risum S, Holtved E, Nielsen M, Weber B, Josipovic M, Hoffmann L. PO-0807 Heterogeneous FDG-guided dose escalation in definitive oesophageal radiotherapy: a feasibility study. Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)31227-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Jensen MF, Hoffmann L, Petersen JBB, Møller DS, Alber M. Energy layer optimization strategies for intensity-modulated proton therapy of lung cancer patients. Med Phys 2018; 45:4355-4363. [PMID: 30129041 DOI: 10.1002/mp.13139] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2017] [Revised: 08/06/2018] [Accepted: 08/13/2018] [Indexed: 11/07/2022] Open
Abstract
PURPOSE When treating lung cancer patients with intensity-modulated proton therapy (IMPT), target coverage can only be guaranteed when utilizing motion mitigation. The three motion mitigation techniques, gating, breath-hold, and dose repainting, all benefit from a more rapid application of the treatment plan. A lower limit for the ungated treatment time is defined by the number of energy layers in the IMPT plan. By limiting this number during treatment planning, IMPT could become more viable for lung cancer patients. We investigate to what extend the number of layers can be reduced in single-field optimization (SFO) and multifield optimization (MFO) plans and which implications it has on the plan quality and robustness. METHODS We have implemented three distinct layer-reducing strategies in the treatment planning system Hyperion; constant energy steps, exponential energy steps, and an adaptive strategy, where the spot weights are exposed to a group sparsity penalty in combination with layer exclusion during optimization. Four levels of increasing layer removal are planned for each strategy. SFO and MFO plans with three treatment fields are created for eleven locally advanced NSCLC patients on the midventilation 4DCT phase to simulate a breath-hold. A minimum dose to the target is ensured for each degree of layer reduction, reflecting the plan quality in the homogeneity index (HI). Plan quality was also assessed by a robustness evaluation, where the patient setup was shifted 2 mm or 4 mm in six directions. RESULTS The three strategies result in very similar target coverages and robustness levels as a function of removed layers. The HI increases unacceptably for all the SFO plans after 50% layer removal as compared to the reference plan, while all the MFO plans are clinically acceptable with up to a highest removed percentage of 75%. The robustness level is constant as a function of removed layers. The SFO plans are significantly more robust than the MFO plans with all P-values below 0.001 (Wilcoxon signed-rank). The overall mean D98% CTV dose difference is at 2-mm setup error amplitude: 0.7 Gy (SFO) and 1.9 Gy (MFO), and at 4 mm: 3.2 Gy (SFO) and 5.4 Gy (MFO), respectively. CONCLUSIONS The number of layers in MFO plans can be reduced substantially more than in SFO plans without compromising plan quality. Furthermore, as the robustness is independent of the number of layers, it follows that if the level of robustness is acceptable or enforced via robust optimization, MFO plans could be candidates for treatment time reductions via energy layer reductions.
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Hoffmann L, Mlinarić M, Buchenauer L, Kunst A, Richter M. Tabakkontrollpolitiken auf lokaler Ebene in 7 europäischen Ländern – Eine qualitative Studie aus Expertenperspektive. Psychother Psychosom Med Psychol 2018. [DOI: 10.1055/s-0038-1668010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Moor I, Hoffmann L, Mlinarić M, Richter M. Die Rolle sozialer Netzwerke für gesundheitliche Ungleichheiten im jugendlichen Tabakkonsum. Psychother Psychosom Med Psychol 2018. [DOI: 10.1055/s-0038-1667887] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Buchenauer L, Kohler E, Mlinarić M, Hoffmann L, Richter M. Die „zwei Realitäten“ der Implementierung und Wirksamkeit von schulischer Tabakkontrolle – eine vergleichende Mixed Methods-Studie aus Schüler- und Lehrersicht. Psychother Psychosom Med Psychol 2018. [DOI: 10.1055/s-0038-1667879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Mlinarić M, Günther S, Moor I, Heilmann K, Hoffmann L, Richter M. Was ist „De-Normalisierung des Rauchens“? Befunde und Trends zu horizontalen und vertikalen Ungleichheiten im Jugendalter. PPMP - PSYCHOTHERAPIE · PSYCHOSOMATIK · MEDIZINISCHE PSYCHOLOGIE 2018. [DOI: 10.1055/s-0038-1667894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Hoffmann L, Mlinarić M, Buchenauer L, Kunst A, Richter M. Enhancing smoke-free environments at the local level: An empirically grounded type construction in 7 European cities. Tob Prev Cessat 2018. [DOI: 10.18332/tpc/91096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Kandi M, Hoffmann L, Sloth Moeller D, Schmidt HH, Knap MM, Khalil AA. Local failure after radical radiotherapy of non-small cell lung cancer in relation to the planning FDG-PET/CT. Acta Oncol 2018; 57:813-819. [PMID: 29205088 DOI: 10.1080/0284186x.2017.1409436] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
OBJECTIVES Local recurrence (rec) in lung cancer is associated with poor survival. This study examined whether the pattern of failure is associated with the most PET avid volume in the planning-FDG-PET/CT scan (p-PET/CT). METHODS 162 consecutive inoperable NSCLC patients (pts) receiving radiotherapy between January 2012 and April 2014 were reviewed. Radiotherapy was delivered in 2 Gy/fraction (5f/week) to a total dose of 60-66 Gy. Pts were followed with CT scans every third month. Patients with local rec as first event were analyzed. For the primary tumor (T) the overlap-fraction (OF) between 50% of SUVpeak on p-PET/CT and the volume of T-rec was calculated: OF = (SUVp50∩T-rec)/min(SUVp50, T-rec). Similarly for the GTV on the p-CT: OF = (GTV∩T-rec)/min(GTV, T-rec). OF was based on a rigid registration between p-PET/CT and rec-CT with PET guided delineation of T- rec. For lymph nodes (LN), the correlation between the location of treated-LN and the location of recurrence-LN was evaluated. RESULTS 67 patients developed local rec. 51 pts had rec in T-site, 45 pts in LN-site. Due to anatomical changes, reliable registration between p-CT and rec-CT was only obtained in 26 pts with T-rec. The median OFSUVp50 was 52, 8% [range 26; 100%] and the median OFGTV was 80.5% [19.7; 100%]. Eleven pts had higher OFSUVp50 than OFGTV. LN-rec predominantly occurred in the station 2R (32%), 4R (46%), 7 (46%) and right hilum (36%). Pts with malignant LNs in station 4R or 7 on p-CT had a high risk of rec in these stations; 4R (55%) and 7 (83%). CONCLUSIONS This study indicates that the most PET active volume on p-PET-CT is a driver for rec at T-site. LN-recurrences predominantly appear in station 2R, 4R, 7 and right hilum. Additional confirmatory studies regarding lymph node mapping and selective lymph node irradiation is needed.
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Elstrøm U, Alber M, Söhn M, Hoffmann L. EP-1832: Validation of Acuros XB dose calculation algorithm with Monte Carlo for clinical treatment plans. Radiother Oncol 2018. [DOI: 10.1016/s0167-8140(18)32141-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Moeller D, Elstrøm U, Assenholt M, Hoffmann L. SP-0214: Clinical implementation of adaptive radiotherapy. Radiother Oncol 2018. [DOI: 10.1016/s0167-8140(18)30524-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Damkjær S, Hoffmann L, Møller D, Petersen J, Josipovic M, Persson G, Munck af Rosenschöld P, Poulsen P. EP-1812: Proton pencil beam scanning with motion emulated as spot shifts: dose reconstruction for lung cancer. Radiother Oncol 2018. [DOI: 10.1016/s0167-8140(18)32121-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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