12 results on '"K. Shipulin"'
Search Results
2. Progress on New Beam Lines Design and Construction for Applied Research at NICA
- Author
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G. Filatov, A. Slivin, E. Syresin, A. Butenko, A. Vorozhtsov, A. Agapov, K. Shipulin, S. Kolesnikov, V. Karpinskii, M. Kuznetsov, S. Kirov, A. Sergeev, A. Galimov, A. Tikhomirov, V. Tyulkin, D. Letkin, D. Leushin, and A. Tuzikov
- Subjects
Nuclear and High Energy Physics ,Radiation ,Radiology, Nuclear Medicine and imaging ,Atomic and Molecular Physics, and Optics - Published
- 2022
3. Comparison of Dose–Response Curves between EBT-XD and EBT3 Radiochromic Films at High Dose Range (2000–4500 cGy) for a 175 MeV Proton Beam
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D. M. Borowicz, M. Kruszyna-Mochalska, K. Shipulin, A. Molokanov, G. Mytsin, and J. Malicki
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Nuclear and High Energy Physics ,Radiation ,Radiology, Nuclear Medicine and imaging ,Atomic and Molecular Physics, and Optics - Published
- 2021
4. SiPM proton irradiation for application in cosmic space
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K. Shipulin, Marek Moszynski, Kamil Brylew, M. Grodzicka-Kobylka, S. Mianowski, A. G. Molokanov, G. V. Mytsin, Z. Mianowska, D. M. Borowicz, M. Krakowiak, Tomasz Szczesniak, D. Rybka, Andrzej Dziedzic, and A. Korgul
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Physics ,Range (particle radiation) ,Physics - Instrumentation and Detectors ,Silicon ,Proton ,FOS: Physical sciences ,Photodetector ,chemistry.chemical_element ,Instrumentation and Detectors (physics.ins-det) ,Scintillator ,Fluence ,High Energy Physics - Experiment ,Nuclear physics ,High Energy Physics - Experiment (hep-ex) ,Silicon photomultiplier ,chemistry ,Irradiation ,Instrumentation ,Mathematical Physics - Abstract
This paper presents the results of the proton irradiation of silicon photomulipliers (SiPMs) by mono-energetic 170 MeV protons with fluence up to 4.6$\times$10$^{9}$ particles/cm$^2$. In our work, three types of silicon photodetectors from Hamamatsu with areas 3$\times$3 mm$^2$ and different subpixel sizes of 25$\times$25 $\mu$m$^2$, 50$\times$50 $\mu$m$^2$, and 75$\times$75 $\mu$m$^2$ were used. The changes in the SiPM dark count rate (DCR) spectrum before and after irradiation in temperatures in the range of 20 $^\circ$C to -65 $^\circ$C are presented. The influence of the DCR changes on the energy resolution of the 662 keV gamma line from the $^{137}$Cs for a non-irradiated GAGG:Ce (1$\%$) scintillator is investigated. The time period of usability of the SiPM detector irradiated by protons in cosmic space was estimated.
- Published
- 2020
5. PO-0888: Comparison of x-ray CT and proton based CT planning in the presence of titanium dental implants
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M. Gao, Vladimir Bashkirov, C. Oancea, Reinhard W. Schulte, Caesar E. Ordoñez, Mark Pankuch, George Coutrakon, K. Shipulin, G. Mytsin, and R. P. Johnson
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Titanium implant ,Materials science ,Ct planning ,Proton ,business.industry ,Oncology and Carcinogenesis ,X-ray ,Hematology ,030218 nuclear medicine & medical imaging ,Other Physical Sciences ,03 medical and health sciences ,0302 clinical medicine ,Oncology ,030220 oncology & carcinogenesis ,Radiology, Nuclear Medicine and imaging ,Oncology & Carcinogenesis ,Nuclear medicine ,business - Abstract
Author(s): Oancea, C; Shipulin, K; Mytsin, G; Gao, M; Pankuch, M; Coutrakon, G; Ordonez, C; Johnson, RP; Bashkirov, V; Schulte, R
- Published
- 2018
6. Effect of titanium dental implants on proton therapy delivered for head tumors: experimental validation using an anthropomorphic head phantom
- Author
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D. Niculae, C. Oancea, Marie Davídková, G. V. Mytsin, I. Ambrožová, K. Shipulin, and A. G. Molokanov
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Titanium implant ,Materials science ,Sobp ,Linear energy transfer ,Imaging phantom ,030218 nuclear medicine & medical imaging ,03 medical and health sciences ,0302 clinical medicine ,Planned Dose ,030220 oncology & carcinogenesis ,Head (vessel) ,Radiation treatment planning ,Instrumentation ,Proton therapy ,Mathematical Physics ,Biomedical engineering - Abstract
A dosimetric experiment was performed at the Medico-Technical Complex in the Joint Institute for Nuclear Research, Dubna, to investigate the effects of metallic dental implants in the treatment of head and neck tumours with proton therapy. The goal of the study was to evaluate the 2D dose distributions of different clinical treatment plans measured in an anthropomorphic phantom, and compare them to predictions from a treatment planning system. The anthropomorphic phantom was sliced into horizontal segments. Two grade 4 Titanium implants were inserted between 2 slices, corresponding to a maxillary area. GafChromic EBT2 films were placed between the segments containing the implants to measure the 2D delivered dose. Two different targets were designed: the first target includes the dental implants in the isocentre, and in the second target, the proton beam is delivered through the implants, which are located at the entrance region of the Bragg curve. The experimental results were compared to the treatment plans made using our custom 3D Treatment Planning System, named RayTreat. To quantitatively determine differences in the isodose distributions (measured and calculated), the gamma index (3 mm, 3%) was calculated for each target for the matrix value in the region of high isodose (> 90%): for the experimental setup, which includes the implants in the SOBP region, the result obtained was 84.3%. When the implants were localised in the entrance region of the Bragg curve, the result obtained was 86.4%. In conclusion, the uncertainties introduced by the clinically planned dose distribution are beyond reasonable limits. The linear energy transfer spectra in close proximity to the implants were investigated using solid state nuclear track detectors (TED). Scattered particles outside the target were detected.
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- 2017
7. Verification of Patient Positioning in Proton Therapy based on Digital X-ray Images
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K. Shipulin and G. Mytsin
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medicine.medical_specialty ,Renewable Energy, Sustainability and the Environment ,Computer science ,business.industry ,Health, Toxicology and Mutagenesis ,Public Health, Environmental and Occupational Health ,law.invention ,Superposition principle ,Nuclear Energy and Engineering ,law ,Position (vector) ,X ray image ,medicine ,Computer vision ,Medical physics ,Tomography ,Artificial intelligence ,Radiogram ,Safety, Risk, Reliability and Quality ,business ,Waste Management and Disposal ,Proton therapy ,Beam (structure) ,Digital radiography - Abstract
Purpose To conduct the verification of the target position relative to the beam, a digital X-ray imaging apparatus by Konica Minolta Company has been installed at the Medico - Technical Complex of the JINR, Dubna. This method is applied instead of the old one with X-ray films. Methods This method presents the superposition of the X-ray image which is taken by the digitizer, with a digital reconstructed radiogram (DRR) calculated from the slices of the X-ray computer tomography. The application of this method allows less time for the proton beam therapy. There are two stages to define the necessary correction. First: the corresponding DRR of the patient is printed. Then the DRR contour is drawn out on transparent film (for example, the bone structures of the skull). Also the target isocentre is marked at the DRR that defines the position of the beam axis relative to the patient on transparent film. Second: the digital X-ray image is loaded and displayed on the screen. Then the transparent film of the DRR is put on the screen. The drawn contour on the transparent film is superposed onto the X-ray image in the monitor (superposition for the bone structures of the skull). After the superposition, the distance is measured from the center cross of the digital X-ray image to the target isocentre of the transparent film. Then, positioning the patient, the target isocentre is adjusted in the superposition to the axis of the beam. Results Production of the digital X-ray image by digitizer REGIUS170 of Konica Minolta Company takes 20 seconds. With the old method with X-ray films, the same X-ray image is produced in 3 minutes. The application of the developed program together with the digital X-ray imaging technique will allow us to reduce the verification time down to one minute. Therefore, we can increase approximately 1.5 times the number of patients treated at the Medico Technical Complex. Conclusions This program is the first version. In this version the superposition cant be made without an operator. The next version of the program is being written now and it will have a function for the automatic superposition.
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- 2008
8. [Littoral granite and its relation to metallogeny]
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F K, SHIPULIN
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Geological Phenomena ,Humans ,Geology ,Silicon Dioxide - Published
- 1950
9. Nomogram for calculating the criterion of slump proneness or swelling of soils
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Yu. K. Shipulin
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Slump ,General Energy ,medicine ,Forensic engineering ,Soil Science ,Ocean Engineering ,Geotechnical engineering ,Swelling ,medicine.symptom ,Nomogram ,Geotechnical Engineering and Engineering Geology ,Geology ,Water Science and Technology - Published
- 1970
10. Technical note: Comprehensive evaluations of gantry and couch rotation isocentricities for implementing proton stereotactic radiosurgery.
- Author
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Shen J, Robertson DG, Bues M, Shipulin K, Liu W, Stoker J, Ashman JB, Lara P, Keole SR, Wong W, and Vora SA
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- Protons, Rotation, Reproducibility of Results, Diagnostic Imaging, Particle Accelerators, Phantoms, Imaging, Radiosurgery
- Abstract
Background: Mechanical accuracy should be verified before implementing a proton stereotactic radiosurgery (SRS) program. Linear accelerator (Linac)-based SRS systems often use electronic portal imaging devices (EPIDs) to verify beam isocentricity. Because proton therapy systems do not have EPID, beam isocentricity tests of proton SRS may still rely on films, which are not efficient., Purpose: To validate that our proton SRS system meets mechanical precision requirements and to present an efficient method to evaluate the couch and gantry's rotational isocentricity for our proton SRS system., Methods: A dedicated applicator to hold brass aperture for proton SRS system was designed. The mechanical precision of the system was tested using a metal ball and film for 11 combinations of gantry and couch angles. A more efficient quality assurance (QA) procedure was developed, which used a scintillator device to replace the film. The couch rotational isocentricity tests were performed using orthogonal kV x-rays with the couch rotated isocentrically to five positions (0°, 315°, 270°, 225°, and 180°). At each couch position, the distance between the metal ball in kV images and the imaging isocenter was measured. The gantry isocentricity tests were performed using a cone-shaped scintillator and proton beams at five gantry angles (0°, 45°, 90°, 135°, and 180°), and the isocenter position and the distance of each beam path to the isocenter were obtained. Daily QA procedure was performed for 1 month to test the robustness and reproducibility of the procedure., Results: The gantry and couch rotational isocentricity exhibited sub-mm precision, with most measurements within ±0.5 mm. The 1-month QA results showed that the procedure was robust and highly reproducible to within ±0.2 mm. The gantry isocentricity test using the cone-shaped scintillator was accurate and sensitive to variations of ±0.2 mm. The QA procedure was efficient enough to be completed within 30 min. The 1-month isocentricity position variations were within 0.5 mm, which demonstrating that the overall proton SRS system was stable and precise., Conclusion: The proton SRS Winston-Lutz QA procedure using a cone-shaped scintillator was efficient and robust. We were able to verify radiation delivery could be performed with sub-mm mechanical precision., (© 2023 American Association of Physicists in Medicine.)
- Published
- 2023
- Full Text
- View/download PDF
11. Dose distribution at the Bragg peak: Dose measurements using EBT and RTQA gafchromic film set at two positions to the central beam axis.
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Borowicz DM, Malicki J, Mytsin G, and Shipulin K
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- Calibration, Phantoms, Imaging, Proton Therapy, Radiotherapy Dosage, Radiotherapy Planning, Computer-Assisted, Film Dosimetry methods
- Abstract
Aim: To evaluate the impact of radiochromic film positioning relative to the central beam axis (CAX) in proton beam therapy. Secondarily, to compare the dosimetric measurements obtained by RTQA and EBT film and to compare these to the doses calculated by the treatment planning system (TPS)., Methods: The EBT and RTQA dosimetric radiochromic films were immersed in a water phantom and irradiated with a proton beam. The films were placed parallel to the CAX and at a 5° angle on the horizontal plane to assess the effect of film inclination on Bragg peak profiles. Calibration was performed by irradiating small pieces of film at doses ranging from 0.0 Gy to 3.5 Gy in increments of 0.5 Gy. The TPS was used to create treatment plans for two different geometrical targets (cylindrical and cuboidal). After irradiation, all film pieces were scanned on a flatbed scanner and red channel data were extracted from the 48-bit RGB images using ImageJ, Photoshop, Origin8, and Excel software. The dose distributions from the irradiated films were compared to the dose obtained from the TPS. Bragg peak profiles were abstracted from the irradiated films and compared., Results: The dosimetric measurements obtained by both EBT and RTQA positioned at a 5° to the CAX closely matched the dose calculated by the TPS for the cylindrical target. In contrast, dose distributions measured in the cuboidal targets were less precise. Gamma index (GI) values (3%/3 mm acceptance criteria for isodose >90% of dose) were 99.8% and 93% for EBT film placed at a 5° angle versus 47.1% and 80.8% for EBT film parallel to the beam. The dosimetric measurements in RTQA film positioned parallel to the CAX showed GI values with <27% agreement with the TPS-calculated dose., Conclusion: Our finding show that RTQA film can be used to accurately measure doses in the proton beam at the region of Bragg peak; however, to obtain the most accurate readings, the film should be positioned at a small angle to the CAX., (© 2017 American Association of Physicists in Medicine.)
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- 2017
- Full Text
- View/download PDF
12. Wax boluses and accuracy of EBT and RTQA radiochromic film detectors in radiotherapy with the JINR Phasotron proton beam.
- Author
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Borowicz DM, Malicki J, Mytsin G, and Shipulin K
- Abstract
Aim: To present the results obtained using radiochromic films EBT and RTQA 1010P for the reconstruction the dose distributions for targets irradiated by proton beam and modified by wax boluses., Background: In Medico-Technical Complex at the Joint Institute for Nuclear Research in Dubna implemented technology of wax boluses., Materials and Methods: Wax boluses are easier to make and they give better dose distributions than boluses made from modeling clay previously used at our center. We irradiated two imaginary targets, one shaped as a cylinder and the other one as two cuboids. The evaluated calibration curve was used for calculation of the dose distributions measured by the EBT and RTQA radiochromic film. In both cases, the measured dose distributions were compared to the dose distributions calculated by the treatment planning system (TPS). We also compared dose distributions using three different conformity indices at a 95% isodose., Results: Better target coverage and better compliance of measurements (semiconductor detectors and radiochromic films) with calculated doses was obtained for cylindrical target than for cuboidal target. The 95% isodose covered well the tumor for both target shapes, while for cuboidal target larger volume around the target received therapeutic dose, due to the complicated target shape. The use wax boluses provided to be effective tool in modifying proton beam to achieve appropriate shape of isodose distribution., Conclusion: EBT film yielded the best visual matching. Both EBT and RTQA films confirmed good conformity between calculated and measured doses, thus confirming that wax boluses used to modify the proton beam resulted in good dose distributions.
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- 2013
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