| 1. |
- Andersson, Martin, et al.
(author)
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An upgrade of the internal dosimetry computer program IDAC
- 2012
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In: Medical Physics in the Baltic States. - : Kaunas University of Technology. - 1822-5721. ; , s. 120-123
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Conference paper (peer-reviewed)abstract
- A full update of the internal dosimetry computer program IDAC has been conducted. The new update is based on new and more accurate computational phantoms to calculate effective dose and absorbed dose to organs and tissues. The new ICRP Adult Reference Computational Phantoms has been adopted as well as the latest of the ICRP standardized biokinetic models. The updated computer program includes a user-friendly graphical user interface.
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| 2. |
- Bernhardsson, Christian, et al.
(author)
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Advancements in prospective dosimetry with NaCl read-out by optically stimulated luminescence
- 2017
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In: Medical Physics in the Baltic States : Proceedings of the 13th International Conference on Medical Physics - Proceedings of the 13th International Conference on Medical Physics. - 1822-5721. ; , s. 26-29
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Conference paper (peer-reviewed)abstract
- In this paper we present the recent improvements for optically stimulated luminescence dosimetry using ordinary salt (NaCl). It is shown that the dosimetric properties of NaCl may be improved by compressing the salt grains to solid pellets. With a linear dose response in, at least, the region <100 mGy, a zero background signal (when pre-bleached) and a minimum measurable dose of 10-20 μGy and high reproducibility, this opens for new applications of prospective OSL dosimetry with NaCl.
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| 3. |
- Bernhardsson, Christian, et al.
(author)
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Assessment of effective dose to an individual carrying materials useful for radiation dosimetry by optically stimulated luminescence
- 2015
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In: Medical Physics in the Baltic States : Proceedings of the 12th International Conference on Medical Physics - Proceedings of the 12th International Conference on Medical Physics. - 1822-5721. ; , s. 48-51
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Conference paper (peer-reviewed)abstract
- Optically stimulated luminescence (OSL) from ordinary household salt has proven high potential for very low dose retrospective dosimetry. In the present paper other common place materials are considered and their dosimetric OSL-properties compared with household salt. The potential for assessment of the effective dose to an individual carrying such materials is investigated.
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| 4. |
- Bernhardsson, Christian, et al.
(author)
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Environmental radiation baseline around the Belarusian nuclear power plant – assessments in Belarus and Lithuania
- 2023
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In: Medical Physics in the Baltic States : Proceedings of the 16<sup>th</sup> International Conference on Medical Physics - Proceedings of the 16<sup>th</sup> International Conference on Medical Physics. - 1822-5721. ; , s. 121-125
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Conference paper (peer-reviewed)abstract
- Prior to the operation of the first Belarussian nuclear power plant (BelNPP), the baseline of the radiation environment was determined within a radius of about 30 km from BelNPP. This independent assessment was carried out during two expeditions in 2019. In 2022, a similar survey was carried out (during the initialoperation of BelNPP) on the Lithuanian side of the boarder. Here we present the overall project and some general results of the baseline assessments.
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| 5. |
- Bernhardsson, Christian, et al.
(author)
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Household salt (NaCl) for optically stimulated luminescence dosimetry: an overview
- 2021
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In: Medical Physics in the Baltic States : Proceedings of the 15th International Conference on Medical Physics - Proceedings of the 15th International Conference on Medical Physics. - 1822-5721. ; , s. 90-94
-
Conference paper (peer-reviewed)abstract
- This brief overview of the use of household salt (NaCl) in optically stimulated luminescence (OSL) dosimetry is focusing on the use of NaCl pellets. It is suggested that the most optimal use of household NaCl, in general prospective dosimetry, is to compress the salt grains to pellets and read the radiation induced signal using OSL rather than TL. A summary of the main OSL dosimetric properties is provided for two Swedish household salts, and compared to the OSL properties of 100 different salts from all over the world.
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| 6. |
- Bernhardsson, Christian, et al.
(author)
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OSL in Household Salt (NaCl) for Environmental, Occupational and Medical Dosimetry
- 2009
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In: Medical Physics In The Baltic States: Proceedings Of The 7th International Conference On Medical Physics. - 1822-5721. ; , s. 65-68
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Conference paper (peer-reviewed)abstract
- The recent progress in our work to implement salt (NaCl) as a dosemeter is presented. Laboratory investigations have indicated a linear dose response from 1 mGy to about 100 mGy and detection limits down to 0.1 mGy. Investigations in the clinic comparing TL-dosimetry in LiF and OSL in NaCl have indicated a similar dose response for the two dosemeters at different photon energies. Field studies with stationary dosemeter kits containing TLDs (LiF) and NaCl suggests that salt is also a good candidate for environmental monitoring of radiation.
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| 7. |
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| 8. |
- Bernhardsson, Christian, et al.
(author)
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Variation in gamma dose rate in different locations following the Chernobyl accident
- 2013
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In: Medical Physics in the Baltic States : Proceedings of the 11th International Conference on Medical Physics - Proceedings of the 11th International Conference on Medical Physics. - 1822-5721. ; , s. 127-130
-
Conference paper (peer-reviewed)abstract
- Radionuclides from the Chernobyl accident were released and dispersed during a limited period of time, but under different weather conditions. As a result the radionuclides were unevenly distributed on the ground. During the years the initial deposition has been altered at some locations by different processes, but remains relatively unchanged in others. Here we report on the current inhomogeneous radionuclide distribution, on both large- and small scales (1 cm2 – 10ths of km2), which on average varies a factor of 4.
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| 9. |
- Chipiga, Larisa, et al.
(author)
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Assesment of patient doses and possible approaches for implementation of optimization procedures in PET/CT examinations in the Russian Federation
- 2017
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In: Medical Physics in the Baltic States : Proceedings of the 13th International Conference on Medical Physics - Proceedings of the 13th International Conference on Medical Physics. - 1822-5721. ; , s. 36-40
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Conference paper (peer-reviewed)abstract
- A dose survey of positron emission tomography (PET) examinations was performed in 12 regions of the Russian Federation, where the effective dose values were assessed for the various types of PET examinations. The comparison to similar published data show that the patient doses in Russia are higher than in other countries. Low-dose CT protocols and justification of multiphase CT protocols should be considered for future optimization and radiation protection of patients.
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| 10. |
- Chipiga, Larisa, et al.
(author)
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Comparison between measured and calculated equivalent doses in CT using anthropomorphic pediatric phantoms
- 2015
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In: Medical Physics in the Baltic States : Proceedings of the 12th International Conference on Medical Physics - Proceedings of the 12th International Conference on Medical Physics. - 1822-5721. ; , s. 96-99
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Conference paper (peer-reviewed)abstract
- Due to the significant increase in pediatric trunk computed tomography (CT) examinations, there is a need for a reliable approach of conducting effectivedose estimate for such procedures. The current study is based on two dosimetric anthropomorphic phantoms representing a 1-year and a 5-year old child. Effectiveand equivalent tissue doses from CT examinations of the trunk were determined by thermoluminescent dosimeters (TLDs) and the CT-Expo software. The results of the two investigated methods show good agreement.
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| 11. |
- Chipiga, Larisa, et al.
(author)
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Proposal of quality assurance system for positron emission tomography in the Russian Federation
- 2019
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In: Medical Physics in the Baltic States : Proceedings of the 14th International Conference on Medical Physics - Proceedings of the 14th International Conference on Medical Physics. - 1822-5721. ; , s. 7-12
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Conference paper (peer-reviewed)abstract
- High diagnostic efficiency as well as the optimization of patient and staff doses in positron emission tomography (PET) can be achieved by implementing quality assurance program. This study was focused on the requirements and basic aspects of quality assurance (QA) in PET combined with computed tomography (CT), that include equipment quality control (QC). QA systems include methods of image QC, examination protocols, radiation monitoring and optimization of radiation protection of the staff and patients. This paper contains the proposals for the QC of equipment and diagnostic images, as well as values of diagnostic reference levels (DRLs) for identification of abnormally high patient doses and optimization of radiation protection. Authors propose the system of quality assurance in PET considering the features of Russian healthcare and radiation protection.
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| 12. |
- Eriksson Stenström, Kristina, et al.
(author)
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PREOPERATIONAL ASSESSMENT OF 14C IN THE VINICINITY OF THE BELARUSIAN NUCLEAR POWER PLANT
- 2021
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In: Medical Physics in the Baltic States : Proceedings of the 15th International Conference - Proceedings of the 15th International Conference. - 1822-5721. ; , s. 133-137
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Conference paper (peer-reviewed)abstract
- As part of an independent assessment of the preoperational radiation environment around the Ostrovets nuclear power plant in Belarus, grass and foodstuffs were collected in 2019 for 14C analysis. The preoperational 14C specific activities in the Ostrovets region were shown to be similar to that of European data from other uncontaminated sites.
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| 13. |
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| 14. |
- Herrnsdorf, Lars
(author)
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Review of Methods to Control Patient Doses and Image Quality in Various CT Techniques
- 2012
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In: Medical Physics in the Baltic States. - 1822-5721. ; , s. 97-98
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Conference paper (peer-reviewed)abstract
- Medical X-ray imaging is the largest source of radiation exposure to the population from artificial sources. Computed tomography (CT) contributes with 50-80 % of that radiation. About 660 000 CT examinations (2005) are done in Sweden every year. A CT examination gives a mean effective dose of 5 mSv, which is about 10 times higher than for a corresponding conventional X-ray investigation. This presentation describes earlier, current and future dosimetric and image quality analysis methods, necessary to correspond to the rapidly developing CT-techniques.
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| 15. |
- Hörnlund, Mikael, et al.
(author)
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Organ doses determined using a RANDO phantom for different radionuclide depositions and photon energies
- 2013
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In: Medical Physics in the Baltic States : Proceedings of the 11th International Conference on Medical Physics - Proceedings of the 11th International Conference on Medical Physics. - 1822-5721. ; , s. 103-105
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Conference paper (peer-reviewed)abstract
- Dose conversion coefficients relating the kerma free-in-air to effective dose have been studied. In order to do so a sampling scheme encompassing all the risk organs and tissues was developed for the Alderson RANDO phantom. Preliminary results are shown for some specific organs irradiated with a point source in the laboratory.
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| 16. |
- Jönsson, Mattias, et al.
(author)
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Technical evaluation of different motion-monitoring systems for respiratory gating in radiation therapy
- 2013
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In: Medical Physics in the Baltic States. - 1822-5721. ; , s. 38-41
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Conference paper (peer-reviewed)abstract
- The purpose of this work was to evaluate three motion-monitoring systems: Sentinel (TM), Catalyst (TM) (both C-RAD) and Real-time Position Management (RPM (TM)) system (Varian Medical Systems Inc) for respiratory gating in radiotherapy. To measure the systems. latency, an in-house built circuit with a microcontroller operating a piston was used. The trigger pulse was sent from the gating systems to the accelerator within 300 mu s. However, the response time of the accelerator could be over 300 ms
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| 17. |
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| 18. |
- Mattsson, Sören, et al.
(author)
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A passive neutron dosemeter for measurements in mixed neutron-photon radiation fields
- 2015
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In: Medical Physics in the Baltic States : Proceedings of the 12th International Conference on Medical Physics - Proceedings of the 12th International Conference on Medical Physics. - 1822-5721. ; , s. 38-42
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Conference paper (peer-reviewed)abstract
- The project combines the highly sensitive salt(NaCl) dosemeter for photon radiation with a neutronphotonconverter in the form of thin gadolinium foilsenclosing the salt. Using an identical salt dosemeter butwithout gadolinium cover determines the primaryphoton contribution. With these twin dosemeters placedin a polyethylene sphere, both photon and neutron dosecontributions can be estimated. This paper describes thedesign and optimization of the construction as well astests and a preliminary calibration of the dosemeter forestimation of neutron dose equivalent in the mixedneutron and photon beam from a Cf-252 source.Currently, the lowest neutron dose equivalent possibleto quantify is around 1 mSv. Some suggestions forfurther improvements are also discussed.
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| 19. |
- Mattsson, Sören
(author)
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Estimations of radiation - induced risks from low doses and how to communicate these risks
- 2013
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In: Medical Physics in the Baltic States. - 1822-5721. ; , s. 46-51
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Conference paper (peer-reviewed)abstract
- This paper is intended to give a short overview of the epidemiologic and experimental data on cancer risks associated with very low radiation absorbed doses. The paper will also discuss methods to present these data in an understandable way to those who are exposed e. g. in medical diagnostics and after a radiological or nuclear accident.
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| 20. |
- Mattsson, Sören
(author)
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Ongoing Work Within ICRP and Other International Organisations in the Field of Radiological Protection in Medicine
- 2012
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In: Medical Physics in the Baltic States. - 1822-5721. ; , s. 7-11
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Conference paper (peer-reviewed)abstract
- This paper is intended to give an overview of the current work of the International Commission on Radiological Protection (ICRP) within the field of medicine and healthcare. The paper focuses on the work carried out in Committee 3. Some views expressed at the ICRP Seminar in Bethesda, USA in October 2011 will also be discussed. Similar and complementary work by other organisatons will also be briefly mentioned.
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| 21. |
- Mattsson, Sören
(author)
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Radiation protection of the patient in diagnostic radiology and nuclear medicine. Are we doing enough?
- 2011
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In: Medical Physics in the Baltic States. - 1822-5721. ; , s. 7-12
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Conference paper (peer-reviewed)abstract
- This paper deals with the radiation protection of patients in diagnostic radiology and nuclear medicine. Modern equipment like CT, PET/CT and SPECT/CT are very important in the daily hospital routine and there is a risk to overuse them, which results in unnecessarily high doses both collectively and to individuals. Detailed referral criteria are needed as well as improved education and training in radiation protection. More frequent contacts between imaging specialists and the referring physicians are also needed.
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| 22. |
- Mattsson, Sören
(author)
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RECENT ADVANCES AND TRENDS IN MEDICAL X-RAY AND MOLECULAR IMAGING
- 2009
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In: Medical Physics In The Baltic States: Proceedings Of The 7Th International Conference On Medical Physics. - 1822-5721. ; , s. 6-10
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Conference paper (peer-reviewed)abstract
- This paper is intended to give an overview of clinically used imaging methods with special reference to digital techniques and 3D techniques for X-ray and nuclear medicine/molecular imaging such as CT, SPECT and PET. The paper will focus on recent advances and trends.
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| 23. |
- Nilsson, Carl Magnus
(author)
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Quality Assurance Programs for a Linear Accelerator
- 2009
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In: Medical Physics In The Baltic States: Proceedings Of The 7th International Conference On Medical Physics. - 1822-5721. ; , s. 60-63
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Conference paper (peer-reviewed)abstract
- Quality Assurance (QA) is a comprehensive method for evaluation of an accelerator's performance. It involves tools aiming at getting a correct absorbed dose to the patient and a good uptime. Daily, weekly, monthly and yearly checks of an accelerator are needed for a good surveillance of the accelerator. An acceptance test is done to check that the accelerator at delivery is within specified limits. The parameters are later checked within different timeframes to sec if the values keep within a specified limit, and if not then corrected. The QA and Quality Control (QC) of the accelerators at Malmo University Hospital are described.
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| 24. |
- Pédehontaa-Hiaa, Guillaume, et al.
(author)
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Evaluation of the region-specific risks of accidental radioactive releases from the European Spallation Source
- 2021
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In: Medical Physics in the Baltic States : Proceedings of the 15th International Conference on Medical Physics - Proceedings of the 15th International Conference on Medical Physics. - 1822-5721. ; , s. 142-146
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Conference paper (peer-reviewed)abstract
- The European Spallation Source (ESS) is a neutron research facility under construction in southern Sweden. The facility will produce a wide range ofradionuclides that could be released into the environment. Some radionuclides are of particular concern such as the rare earth gadolinium-148. In this article, the local environment was investigated in terms of food production and rare earth element concentration in soil. The collected data will later be used to model thetransfer of radioactive contaminations from the ESS.
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| 25. |
- Peterson, Pernilla, et al.
(author)
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MR for Quantitative Fat Imaging
- 2011
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In: Medical Physics in the Baltic States. - 1822-5721. ; , s. 19-22
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Conference paper (peer-reviewed)abstract
- An absolute measure of the fat content in various organs is an important part of diagnostics in obesity and diabetes. Fat quantification using MR-imaging is a non-invasive technique which provides both quantitative and spatial information on fat accumulation. However, for absolute quantification, it is necessary to address the various sources of contrast in MR-imaging. This paper summarizes basic MR fat quantification techniques and discusses the main parameters affecting absolute fat quantification.
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| 26. |
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| 27. |
- Skovorodko, Kirill, et al.
(author)
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Radiation protection considerations in 166Ho radioembolization procedures
- 2023
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In: Medical Physics in the Baltic States : Proceedings of the 16<sup>th</sup> International Conference - Proceedings of the 16<sup>th</sup> International Conference. - 1822-5721. ; , s. 32-36
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Conference paper (peer-reviewed)abstract
- Radioembolization with 166Ho microspheres is a minimally invasive procedure in which radioactive microspheres are administered directly to liver tumor via the hepatic artery during an interventional radiological procedure. Scout and therapeutic doses of 166Ho were delivered to patients in 2022 and 2023 at VilniusUniversity Hospital Santaros Klinikos. The presented study was aimed at investigating occupational exposure levels and other radiation protection and safety aspects when working with 166Ho.
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| 28. |
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| 29. |
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| 30. |
- Svahn, Tony
(author)
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Breast Tomosynthesis or Digital Mammography for Breast Cancer Screening?
- 2011
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In: Medical Physics in the Baltic States. - 1822-5721. ; , s. 53-56
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Conference paper (peer-reviewed)abstract
- Screening mammography plays a key role in the early detection of breast cancer, however, estimates of sensitivities (48-88%) and specificities (82-98%) suggest that the diagnostic accuracy can be improved (1, 2, 3). Breast tomosynthesis (BT) is a 3D technique that is expected to improve breast cancer detection compared to screen-film and digital mammography DM). This work presents two clinical observer performance studies performed at Skane University Hospital, Malmo, Sweden, that investigates the diagnostic accuracy of BT compared to DM.
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| 31. |
- Svensson, Henrik, et al.
(author)
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An investigation of a potential multipurpose readout modality for two and three-dimensional dosimetry using optical computed tomography scanners
- 2011
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In: Medical Physics in the Baltic States. - 1822-5721. ; , s. 39-44
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Conference paper (peer-reviewed)abstract
- Radiochromic film, polymer gel and radiochromic plastic are three different kinds of dosimeters developed for radiation therapy and suitable for optical readout. In this study, different optical CT scanners are used to scan the dosimeters to find out if they could be used as multi-purpose scanners, i.e. for readout of the different kinds of dosimeters. Promising results are found but further development needs to be done before any of the scanners could be categorized as multi-purpose scanners.
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| 32. |
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| 33. |
- Vodovatov, Aleksandr, et al.
(author)
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Esitmation of effective doses for barium meal fluoroscopic examinations
- 2017
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In: Medical Physics in the Baltic States : Proceedings of the 13th International Conference on Medical Physics - Proceedings of the 13th International Conference on Medical Physics. - 1822-5721. ; , s. 137-141
-
Conference paper (peer-reviewed)abstract
- The aim of the current study is to establish conversion coefficients (CCs) from dose-area product to effective dose for barium meal (BM) fluoroscopic examinations. The study is based on data collected at a major University hospital in St-Petersburg, Russia. The structure of the BM examinations was evaluated and a computational model for effective dose estimation, using PCXMC 2.0 software, was developed. Resulting values of CCs estimated in the study were comparable with previously published data for BM examinations.
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| 34. |
- Vodovatov, Aleksandr, et al.
(author)
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Establishing National diagnostic reference levels in the Russian Federation based on regional dose surveys
- 2015
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In: Medical Physics in the Baltic States : Proceedings of the 12th International Conference on Medical Physics - Proceedings of the 12th International Conference on Medical Physics. - 1822-5721. ; , s. 11-14
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Conference paper (peer-reviewed)abstract
- Establishing diagnostic reference levels (DRLs) in a big country is complicated due to differences in radiological practice between different regions. In 2009-2014, a dose survey was performed in six Russian regions. Based on the results of the survey, preliminary DRLs for conventional X-ray examinations were established on a national level. Additionally, the local authorities were granted the possibility to establish regional DRLs if the local dose distributions significantly differed from the proposed national DRLs.
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| 35. |
- Vodovatov, Alexandr, et al.
(author)
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Estimation of patient doses from X-ray examinations in the Bryansk region hospitals
- 2013
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In: Medical Physics in the Baltic States : Proceedings of the 11th International Conference on Medical Physics - Proceedings of the 11th International Conference on Medical Physics. - 1822-5721. ; , s. 133-136
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Conference paper (peer-reviewed)abstract
- During 2012 - 2013 a study to evaluate conventional X-ray procedures and patient doses in Klintzi and Novozibkov areas of Bryansk region, Russia, was conducted. X-ray operation parameters included quality assurance of equipment, collection of procedure parameters and clinical practice evaluation. Effective doses were calculated for each selected procedure and dose distributions were established. 75-percentiles of the dose distributions were selected as a preliminary regional diagnostic reference levels (DRL). The DRLs were comparable to the St-Petersburg diagnostic reference levels, except for the skull, abdomen and pelvis areas. High dose spread is explained by differences in radiological practice and unit condition.
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| 36. |
- Ören, Ünal, et al.
(author)
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Using computed tomography and digital radiography of the human body to visualize metal fragments from bomb explosions – A preliminary report
- 2012
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In: Medical Physics in the Baltic States. - 1822-5721. ; , s. 127-131
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Conference paper (peer-reviewed)abstract
- A thoracic phantom, with embedded fragments of uranium (U) and iron (Fe) of different sizes, was imaged with digital radiography, standard-dose CT and low-dose CT and the detectable size of the fragments was recorded. U and Fe fragments were detected in diameters down to 100 mu m and 300 mu m, respectively with the standard-dose CT and digital radiography. The size limit using the low-dose CT was 300-400 mu m for U fragments and 500-700 mu m for Fe fragments.
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