TY  - JOUR
AU  - Kojić, Andrea
AU  - Kržanović, Nikola
AU  - Živanović, Miloš
AU  - Toroi, Paula
AU  - Bakrač, Luka
AU  - Božović, Predrag
AU  - Stanković Petrović, Jelena
PY  - 2024
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/13192
AB  - Quality control and assurance of mammography X-ray generators include usage of solid-state detectors and/or ionization chambers which are calibrated in standard reference radiation fields. IEC 61267:2005 standard defines reference mammography radiation fields for Mo/Mo anode/filtration, while various anode/filtration combinations are encountered in clinical mammography X-ray units. Not all Secondary Standard Dosimetry Laboratories have an X-ray generator with Mo/Mo radiation setup, thus traceability can be established only for the available anode/filter combinations which is commonly limited to W/Al. In this study, W/Al radiation fields were established under laboratory conditions by performing half-value layer measurements, and characterization of four solid-state detectors was performed. X-ray multimeter performance was evaluated in terms of energy response in the W/Al radiation fields. In the laboratory conditions the energy response of the dosimeters had larger deviation from unity for dosimeters without appropriate anode/filter combination selected in the software settings, even though most of the dosimeters had uniform relative response. Discrepancy in the response was further investigated by examining its variation induced by available detector software settings, and it was determined that the dosimeter response can vary up to 20 %. In clinical setup, half-value layer was determined, and detector performance was examined. Dosimeters were tested in clinical fields with Mo/Mo, Mo/Rh, W/Rh, W/Ag anode/filter combinations in the X-ray tube voltage range from 25 kV to 35 kV. For most clinical radiation fields, multi-element detectors had energy response deviation within ±5 %. The single-element detector had one software setting available and has exhibited strong energy dependence. Extensive testing of detector response such as presented in this paper allows for correction factor interpolation based on half-value layer.
T2  - Radiation Measurements
T1  - Influence of anode/filtration setup on X-ray multimeter energy response in mammography applications
IS  - InPress
SP  - 107135
DO  - 10.1016/j.radmeas.2024.107135
ER  - 

@article{
author = "Kojić, Andrea and Kržanović, Nikola and Živanović, Miloš and Toroi, Paula and Bakrač, Luka and Božović, Predrag and Stanković Petrović, Jelena",
year = "2024",
abstract = "Quality control and assurance of mammography X-ray generators include usage of solid-state detectors and/or ionization chambers which are calibrated in standard reference radiation fields. IEC 61267:2005 standard defines reference mammography radiation fields for Mo/Mo anode/filtration, while various anode/filtration combinations are encountered in clinical mammography X-ray units. Not all Secondary Standard Dosimetry Laboratories have an X-ray generator with Mo/Mo radiation setup, thus traceability can be established only for the available anode/filter combinations which is commonly limited to W/Al. In this study, W/Al radiation fields were established under laboratory conditions by performing half-value layer measurements, and characterization of four solid-state detectors was performed. X-ray multimeter performance was evaluated in terms of energy response in the W/Al radiation fields. In the laboratory conditions the energy response of the dosimeters had larger deviation from unity for dosimeters without appropriate anode/filter combination selected in the software settings, even though most of the dosimeters had uniform relative response. Discrepancy in the response was further investigated by examining its variation induced by available detector software settings, and it was determined that the dosimeter response can vary up to 20 %. In clinical setup, half-value layer was determined, and detector performance was examined. Dosimeters were tested in clinical fields with Mo/Mo, Mo/Rh, W/Rh, W/Ag anode/filter combinations in the X-ray tube voltage range from 25 kV to 35 kV. For most clinical radiation fields, multi-element detectors had energy response deviation within ±5 %. The single-element detector had one software setting available and has exhibited strong energy dependence. Extensive testing of detector response such as presented in this paper allows for correction factor interpolation based on half-value layer.",
journal = "Radiation Measurements",
title = "Influence of anode/filtration setup on X-ray multimeter energy response in mammography applications",
number = "InPress",
pages = "107135",
doi = "10.1016/j.radmeas.2024.107135"
}

Kojić, A., Kržanović, N., Živanović, M., Toroi, P., Bakrač, L., Božović, P.,& Stanković Petrović, J.. (2024). Influence of anode/filtration setup on X-ray multimeter energy response in mammography applications. in Radiation Measurements(InPress), 107135.
https://doi.org/10.1016/j.radmeas.2024.107135

Kojić A, Kržanović N, Živanović M, Toroi P, Bakrač L, Božović P, Stanković Petrović J. Influence of anode/filtration setup on X-ray multimeter energy response in mammography applications. in Radiation Measurements. 2024;(InPress):107135.
doi:10.1016/j.radmeas.2024.107135 .

Kojić, Andrea, Kržanović, Nikola, Živanović, Miloš, Toroi, Paula, Bakrač, Luka, Božović, Predrag, Stanković Petrović, Jelena, "Influence of anode/filtration setup on X-ray multimeter energy response in mammography applications" in Radiation Measurements, no. InPress (2024):107135,
https://doi.org/10.1016/j.radmeas.2024.107135 . .

TY  - CONF
AU  - Božović, Predrag
AU  - Kržanović, Nikola
AU  - Živanović, Miloš
AU  - Kojić, Andrea
AU  - Siiskonen, Teemu
AU  - Blideanu, Valentin
AU  - Reetta, Nylund
AU  - Schettino, Giuseppe
AU  - Toroi, Paula
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11115
AB  - Due to constant development in radiodiagnostic and radiotherapy procedures with increasing complexity, a need for high-level coordination of the ionizing radiation metrology community was recognized to better respond to the needs of end users. In order to facilitate knowledge dissemination and improve communication between stakeholders involved in medical applications of ionizing radiation, a Joint Network Project was started in 2020. One of the specific objectives of Work Package 2 of the project 19NET04 MIRA, “Support for a European Metrology Network on the medical use of ionizing radiation” is to support the developing states, ensuring that the planned EMN is inclusive through improvements in the medical use of ionizing radiation [1]. Czech Republic, Romania and Serbia were defined as countries of interest to conduct the survey and collect relevant data from stakeholders in the category of medical staff and professionals, so that the potential for improvement for medical applications of ionizing radiation can be evaluated. For the purpose of data collection, an online questionnaire was prepared and distributed to the stakeholders. The questionnaire was structured in such a way to allow easier collection of information regarding availability of (1) calibration services; (2) documented technical protocols; (3) standard documentation in the establishments for different ionizing radiation applications. Implementation of a Quality assurance (QA) programme was investigated, as well as the consistency in realization of proficiency testing (PT) or audits. The stakeholders were asked if additional workshops or training programmes are needed in their area of expertise. The radiodiagnostic modalities included in the questionnaire were the general radiography, mammography, computed tomography and interventional procedures, while radiotherapy modalities included external beam radiotherapy (teletherapy) and brachytherapy. Although nuclear medicine (therapy and diagnostic) procedures were part of the questionnaire, none of the respondents have capabilities for these applications. Based on the information collected via the online questionnaire, calibration services are available for most of the modalities, except for brachytherapy where traceability is not established. QA and PT are regularly performed in radiotherapy, while it is not the case in radiodiagnostic modalities. Improvement in knowledge transfer is needed for all of the applications investigated. Considering the acquired information, there is a clear need for EMN to support knowledge transfer, communication and technical exchange between the metrology community and the stakeholders involved in the medical applications of ionizing radiation. The forthcoming European Metrology Network will further elaborate the knowledge dissemination and stakeholder dialogue through its stakeholder panels and joint training efforts
PB  - RAD Centre, Niš, Serbia
C3  - RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; June 13-17; Herceg Novi, Montenegro
T1  - Investigation on the potential of improvement in the field of medical applications of ionizing radiation via the future European Metrology Network
SP  - 78
DO  - 10.21175/rad.spr.abstr.book.2022.19.4
ER  - 

@conference{
author = "Božović, Predrag and Kržanović, Nikola and Živanović, Miloš and Kojić, Andrea and Siiskonen, Teemu and Blideanu, Valentin and Reetta, Nylund and Schettino, Giuseppe and Toroi, Paula",
year = "2022",
abstract = "Due to constant development in radiodiagnostic and radiotherapy procedures with increasing complexity, a need for high-level coordination of the ionizing radiation metrology community was recognized to better respond to the needs of end users. In order to facilitate knowledge dissemination and improve communication between stakeholders involved in medical applications of ionizing radiation, a Joint Network Project was started in 2020. One of the specific objectives of Work Package 2 of the project 19NET04 MIRA, “Support for a European Metrology Network on the medical use of ionizing radiation” is to support the developing states, ensuring that the planned EMN is inclusive through improvements in the medical use of ionizing radiation [1]. Czech Republic, Romania and Serbia were defined as countries of interest to conduct the survey and collect relevant data from stakeholders in the category of medical staff and professionals, so that the potential for improvement for medical applications of ionizing radiation can be evaluated. For the purpose of data collection, an online questionnaire was prepared and distributed to the stakeholders. The questionnaire was structured in such a way to allow easier collection of information regarding availability of (1) calibration services; (2) documented technical protocols; (3) standard documentation in the establishments for different ionizing radiation applications. Implementation of a Quality assurance (QA) programme was investigated, as well as the consistency in realization of proficiency testing (PT) or audits. The stakeholders were asked if additional workshops or training programmes are needed in their area of expertise. The radiodiagnostic modalities included in the questionnaire were the general radiography, mammography, computed tomography and interventional procedures, while radiotherapy modalities included external beam radiotherapy (teletherapy) and brachytherapy. Although nuclear medicine (therapy and diagnostic) procedures were part of the questionnaire, none of the respondents have capabilities for these applications. Based on the information collected via the online questionnaire, calibration services are available for most of the modalities, except for brachytherapy where traceability is not established. QA and PT are regularly performed in radiotherapy, while it is not the case in radiodiagnostic modalities. Improvement in knowledge transfer is needed for all of the applications investigated. Considering the acquired information, there is a clear need for EMN to support knowledge transfer, communication and technical exchange between the metrology community and the stakeholders involved in the medical applications of ionizing radiation. The forthcoming European Metrology Network will further elaborate the knowledge dissemination and stakeholder dialogue through its stakeholder panels and joint training efforts",
publisher = "RAD Centre, Niš, Serbia",
journal = "RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; June 13-17; Herceg Novi, Montenegro",
title = "Investigation on the potential of improvement in the field of medical applications of ionizing radiation via the future European Metrology Network",
pages = "78",
doi = "10.21175/rad.spr.abstr.book.2022.19.4"
}

Božović, P., Kržanović, N., Živanović, M., Kojić, A., Siiskonen, T., Blideanu, V., Reetta, N., Schettino, G.,& Toroi, P.. (2022). Investigation on the potential of improvement in the field of medical applications of ionizing radiation via the future European Metrology Network. in RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; June 13-17; Herceg Novi, Montenegro
RAD Centre, Niš, Serbia., 78.
https://doi.org/10.21175/rad.spr.abstr.book.2022.19.4

Božović P, Kržanović N, Živanović M, Kojić A, Siiskonen T, Blideanu V, Reetta N, Schettino G, Toroi P. Investigation on the potential of improvement in the field of medical applications of ionizing radiation via the future European Metrology Network. in RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; June 13-17; Herceg Novi, Montenegro. 2022;:78.
doi:10.21175/rad.spr.abstr.book.2022.19.4 .

Božović, Predrag, Kržanović, Nikola, Živanović, Miloš, Kojić, Andrea, Siiskonen, Teemu, Blideanu, Valentin, Reetta, Nylund, Schettino, Giuseppe, Toroi, Paula, "Investigation on the potential of improvement in the field of medical applications of ionizing radiation via the future European Metrology Network" in RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; June 13-17; Herceg Novi, Montenegro (2022):78,
https://doi.org/10.21175/rad.spr.abstr.book.2022.19.4 . .

TY  - JOUR
AU  - Hourdakis, Constantine J.
AU  - Bueermann, Ludwig
AU  - Ciraj-Bjelac, Olivera
AU  - Csete, Istvan
AU  - Delis, Harry
AU  - Gomola, Igor
AU  - Persson, Linda
AU  - Novak, Leos
AU  - Petkov, Ivailo
AU  - Toroi, Paula
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/271
AB  - A comparison of calibration results and procedures in terms of air kerma length product, P-KL, and air kerma, K, was conducted between eight dosimetry laboratories. A pencil-type ionization chamber (IC), generally used for computed tomography dose measurements, was calibrated according to three calibration methods, while its residual signal and other characteristics (sensitivity profile, active length) were assessed. The results showed that the partial irradiation method is the preferred method for the pencil-type IC calibration in terms of P-KL and it could be applied by the calibration laboratories successfully. Most of the participating laboratories achieved high level of agreement ( GT 99%) for both dosimetry quantities (P-KL and K). Estimated relative standard uncertainties of comparison results vary among laboratories from 0.34% to 2.32% depending on the quantity, beam quality and calibration method applied. Detailed analysis of the assigned uncertainties have been presented and discussed. (C) 2015 Associazione Italiana di Fisica Medica. Published by Elsevier Ltd. All rights reserved.
T2  - Physica Medica
T1  - Comparison of pencil-type ionization chamber calibration results and methods between dosimetry laboratories
VL  - 32
IS  - 1
SP  - 42
EP  - 51
DO  - 10.1016/j.ejmp.2015.09.008
ER  - 

@article{
author = "Hourdakis, Constantine J. and Bueermann, Ludwig and Ciraj-Bjelac, Olivera and Csete, Istvan and Delis, Harry and Gomola, Igor and Persson, Linda and Novak, Leos and Petkov, Ivailo and Toroi, Paula",
year = "2016",
abstract = "A comparison of calibration results and procedures in terms of air kerma length product, P-KL, and air kerma, K, was conducted between eight dosimetry laboratories. A pencil-type ionization chamber (IC), generally used for computed tomography dose measurements, was calibrated according to three calibration methods, while its residual signal and other characteristics (sensitivity profile, active length) were assessed. The results showed that the partial irradiation method is the preferred method for the pencil-type IC calibration in terms of P-KL and it could be applied by the calibration laboratories successfully. Most of the participating laboratories achieved high level of agreement ( GT 99%) for both dosimetry quantities (P-KL and K). Estimated relative standard uncertainties of comparison results vary among laboratories from 0.34% to 2.32% depending on the quantity, beam quality and calibration method applied. Detailed analysis of the assigned uncertainties have been presented and discussed. (C) 2015 Associazione Italiana di Fisica Medica. Published by Elsevier Ltd. All rights reserved.",
journal = "Physica Medica",
title = "Comparison of pencil-type ionization chamber calibration results and methods between dosimetry laboratories",
volume = "32",
number = "1",
pages = "42-51",
doi = "10.1016/j.ejmp.2015.09.008"
}

Hourdakis, C. J., Bueermann, L., Ciraj-Bjelac, O., Csete, I., Delis, H., Gomola, I., Persson, L., Novak, L., Petkov, I.,& Toroi, P.. (2016). Comparison of pencil-type ionization chamber calibration results and methods between dosimetry laboratories. in Physica Medica, 32(1), 42-51.
https://doi.org/10.1016/j.ejmp.2015.09.008

Hourdakis CJ, Bueermann L, Ciraj-Bjelac O, Csete I, Delis H, Gomola I, Persson L, Novak L, Petkov I, Toroi P. Comparison of pencil-type ionization chamber calibration results and methods between dosimetry laboratories. in Physica Medica. 2016;32(1):42-51.
doi:10.1016/j.ejmp.2015.09.008 .

Hourdakis, Constantine J., Bueermann, Ludwig, Ciraj-Bjelac, Olivera, Csete, Istvan, Delis, Harry, Gomola, Igor, Persson, Linda, Novak, Leos, Petkov, Ivailo, Toroi, Paula, "Comparison of pencil-type ionization chamber calibration results and methods between dosimetry laboratories" in Physica Medica, 32, no. 1 (2016):42-51,
https://doi.org/10.1016/j.ejmp.2015.09.008 . .