TY - JOUR AU - Vékás, Márton AU - Stelczer, Gábor AU - Jánváry, Zsolt Levente AU - Major, Tibor AU - Takácsi-Nagy, Zoltán TI - Comparing the Hungarian RTT’s practice in the head and neck region with the ESTRO Guideline JF - RADIOTHERAPY AND ONCOLOGY J2 - RADIOTHER ONCOL VL - 194 PY - 2024 IS - Suppl.1 SP - S5821 EP - S5823 SN - 0167-8140 UR - https://m2.mtmt.hu/api/publication/34839211 ID - 34839211 LA - English DB - MTMT ER - TY - JOUR AU - Stelczer, Gábor AU - Vékás, Márton AU - Éva, Folyovich AU - Jánváry, Zsolt Levente AU - Pesznyák, Csilla AU - Major, Tibor TI - Evaluation of intrafractional movements for brain and prostate SBRT treatments with CyberKnife JF - RADIOTHERAPY AND ONCOLOGY J2 - RADIOTHER ONCOL VL - 194 PY - 2024 IS - Suppl. 1 SP - S4322 EP - S4323 SN - 0167-8140 UR - https://m2.mtmt.hu/api/publication/34837939 ID - 34837939 LA - English DB - MTMT ER - TY - JOUR AU - Koszta, Enikő AU - Gazdag-Hegyesi, Szilvia AU - Gáldi, Ádám AU - Major, Tibor AU - Takácsi-Nagy, Zoltán AU - Pesznyák, Csilla AU - Stelczer, Gábor TI - Dosimetric comparison of liver SBRT treatments with conventional linear accelerator and CyberKnife JF - RADIOTHERAPY AND ONCOLOGY J2 - RADIOTHER ONCOL VL - 194 PY - 2024 IS - Suppl.1 SP - S3637 EP - S3639 SN - 0167-8140 UR - https://m2.mtmt.hu/api/publication/34837185 ID - 34837185 LA - English DB - MTMT ER - TY - JOUR AU - Mészáros, Norbert AU - Jánváry, Zsolt Levente AU - Smanykó, Viktor AU - Major, Tibor AU - Stelczer, Gábor AU - Takácsi-Nagy, Zoltán AU - Polgár, Csaba TI - Stereotactic Partial Breast Irradiation: 4-year Clinical Results and Cosmetic Outcomes JF - RADIOTHERAPY AND ONCOLOGY J2 - RADIOTHER ONCOL VL - 194 PY - 2024 IS - Suppl. 1 SP - S510 EP - S511 SN - 0167-8140 UR - https://m2.mtmt.hu/api/publication/34836863 ID - 34836863 LA - English DB - MTMT ER - TY - GEN AU - Stelczer, Gábor TI - Enen2plus – Nemzetközi mobilitási lehetőségek orvosi fizikus szakemberek és hallgatók számára PY - 2024 UR - https://m2.mtmt.hu/api/publication/34795281 ID - 34795281 N1 - Előadás LA - Hungarian DB - MTMT ER - TY - JOUR AU - Casar, Bozidar AU - Mendez, Ignasi AU - Gershkevitsh, Eduard AU - Wegener, Sonja AU - Jaffray, David AU - Heaton, Robert AU - Pesznyák, Csilla AU - Stelczer, Gábor AU - Bulski, Wojciech AU - Chełminski, Krzysztof AU - Smirnov, Georgiy AU - Antipina, Natalia AU - Beavis, Andrew W AU - Harding, Nicholas Oliver AU - Jurković, Slaven AU - Hwang, Min-Sig AU - Huq, M Saiful TI - On dosimetric characteristics of detectors for relative dosimetry in small fields. a multicenter experimental study. TS - a multicenter experimental study. JF - PHYSICS IN MEDICINE AND BIOLOGY J2 - PHYS MED BIOL VL - 69 PY - 2024 IS - 3 PG - 15 SN - 0031-9155 DO - 10.1088/1361-6560/ad154c UR - https://m2.mtmt.hu/api/publication/34443696 ID - 34443696 AB - In this multicentric collaborative study, we aimed to verify whether the selected radiation detectors satisfy the requirements of TRS-483 Code of Practice for relative small field dosimetry in megavoltage photon beams used in radiotherapy, by investigating four dosimetric characteristics. Furthermore, we intended to analyze and complement the recommendations given in TRS-483.Approach:Short-term stability, dose linearity, dose-rate dependence, and leakage were determined for 17 types of detectors considered suitable for small field dosimetry. Altogether, 47 detectors were used in this study across ten institutions. Photon beams with 6 and 10 MV, with and without flattening filters, generated by Elekta Versa HDTM or Varian TrueBeamTM linear accelerators, were used.Main Results:The tolerance level of 0.1% for stability was fulfilled by 70% of the data points. For the determination of dose linearity, two methods were considered. Results from the use of a stricter method show that the guideline of 0.1% for dose linearity is not attainable for most of the detectors used in the study. Following the second approach (squared Pearson's correlation coefficient r2), it was found that 100% of the data fulfill the criteria r2 > 0.999 (0.1% guideline for tolerance). Less than 50% of all data points satisfied the published tolerance of 0.1% for dose-rate dependence. Almost all data points (98.2%) satisfied the 0.1% criterion for leakage.Significance:For short-term stability (repeatability), it was found that the 0.1% guideline could not be met. Therefore, a less rigorous criterion of 0.25% is proposed. For dose linearity, our recommendation is to adopt a simple and clear methodology and to define an achievable tolerance based on the experimental data. For dose-rate dependence, a realistic criterion of 1% is proposed instead of the present 0.1%. Agreement was found with published guidelines for background signal (leakage).. LA - English DB - MTMT ER - TY - GEN AU - Jurányi, Zsolt AU - Kocsis, Zsuzsa AU - Katalin, Lumniczky AU - Katalin, Balázs AU - Ágoston, Péter Zoltán AU - Farkas, Gyöngyi AU - Sándor, Gyöngyvér Orsolya AU - Székely, Gábor AU - Major, Tibor AU - Pesznyák, Csilla AU - Stelczer, Gábor AU - Jorgo, Kliton AU - Gesztesi, László AU - Polgár, Csaba AU - Géza, Sáfrány TI - Radiobiological investigation of chromosomes and frequency of immune cell populations indicates significant alterations even years after prostate cancer brachytherapy and teletherapy PY - 2023 UR - https://m2.mtmt.hu/api/publication/34554546 ID - 34554546 N1 - Előadás LA - English DB - MTMT ER - TY - JOUR AU - Ortutay, Rita AU - Jánváry, Zsolt Levente AU - Stelczer, Gábor AU - Fröhlich, Georgina AU - Takácsi-Nagy, Zoltán AU - Polgár, Csaba TI - Májáttétek CyberKnife készülékkel végzett sztereotaxiás besugárzásának eredményessé JF - MAGYAR ONKOLÓGIA J2 - MAGYAR ONKOLÓGIA VL - 67 PY - 2023 IS - 1. szuppl. SP - 48 EP - 48 PG - 1 SN - 0025-0244 UR - https://m2.mtmt.hu/api/publication/34344007 ID - 34344007 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Mészáros, Norbert AU - Jánváry, Zsolt Levente AU - Stelczer, Gábor AU - Smanykó, Viktor AU - Major, Tibor AU - Polgár, Csaba TI - Posztoperatív részleges emlőbesugárzás CyberKnife gyorsítóval: a sztereotaxiás, légzéskövető, képvezérelt technika klinikai eredményeinek bemutatása JF - MAGYAR ONKOLÓGIA J2 - MAGYAR ONKOLÓGIA VL - 67 PY - 2023 IS - 1. szuppl. SP - 46 EP - 46 PG - 1 SN - 0025-0244 UR - https://m2.mtmt.hu/api/publication/34343830 ID - 34343830 LA - Hungarian DB - MTMT ER - TY - GEN AU - Folyovich, Éva AU - Stelczer, Gábor AU - Jánváry, Zsolt Levente AU - Vékás, Márton TI - CyberKnife készülékkel végzett légzéskövetéses sztereotaxiás sugárkezelések kvantitatív analízise PY - 2023 UR - https://m2.mtmt.hu/api/publication/34124460 ID - 34124460 LA - Hungarian DB - MTMT ER -