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    Wyświetlanie 1-5 z 5
    Tytuł:
    A hand phantom for radiological measurements
    Autorzy:
    Majowska, B.
    Tuszyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/148660.pdf
    Data publikacji:
    2005
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    thermoluminescence dosimetry
    TLD
    radiological protection
    phantom
    Opis:
    The paper presents the construction of a hand phantom and its usefulness for radiological measurements. Situations when the hand is exposed to ionizing radiation stimulated the invention of this phantom. An extremity dosimeter was placed on the middle finger of the phantom. All measured doses are relative. The doses were compared with the dose from the extremity dosimeter. The aim of this paper was not to show values of the measured doses in legal units but the authors wanted to show the difference between the dose received by the extremity dosimeter and the doses measured on the inside of the hand phantom. High-sensitive LiF:Mg,Cu,P thermoluminescence detectors were used for the measurements because of their small size and close tissue equivalence. The hand phantom makes it possible to acquire the dose distribution on the inside of the hand. The authors suggested the calculation of the coefficients: the average hand phantom coefficient CHPhAV and the maximum hand coefficient CHPhmax from phantom measurements. The extremity dosimeter dose estimates according to the recommended coefficients allowed to obtain more reliable values.
    Źródło:
    Nukleonika; 2005, 50, 4; 167-172
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of a vision‐based autonomous turret
    Autorzy:
    Louali, Rabah
    Negadi, Djilali
    Hamadouche, Rabah
    Nemra, Abdelkrim
    Powiązania:
    https://bibliotekanauki.pl/articles/27314239.pdf
    Data publikacji:
    2022
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    autonomous turret
    stepper motor
    DC motor
    vision based control
    Tracking‐Learning‐Detection algorithm
    TLD algorithm
    Kalman based visual tracking
    Opis:
    This article describes the hardware and software de‐ sign of a vision‐based autonomous turret system. A two degree of freedom (2 DOF) turret platform is designed to carry a cannon equipped with an embedded camera and actuated by stepper motors or direct current motors. The turret system includes a central calculator running a visual detection and tracking solution, and a microcon‐ troller, responsible for actuators control. The Tracking‐ Learning‐Detection (TLD) algorithm is implemented for target detection and tracking. Furthermore, a Kalman filter algorithm is implemented to continue the tracking in case of occlusion. The performances of the designed turret, regarding response time, accuracy and the execu‐ tion time of its main tasks, are evaluated. In addition, an experimental scenario was performed for real‐time autonomous detection and tracking of a moving target.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2022, 16, 4; 72--77
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurements of doses from photon beam irradiation and scattered neutrons in an anthropomorphic phantom model of prostate cancer: a comparison between 3DCRT, IMRT and tomotherapy
    Autorzy:
    Kowalik, A.
    Jackowiak, W.
    Malicki, J.
    Skórska, M.
    Adamczyk, M.
    Konstanty, E.
    Piotrowski, T.
    Polaczek-Grelik, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/146348.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    3DCRT
    IMRT
    low doses
    neutron doses
    thermoluminescent detectors (TLD)
    tomotherapy
    Opis:
    The rapid development of new radiotherapy technologies, such as intensity modulated radiotherapy (IMRT) or tomotherapy, has resulted in the capacity to deliver a more homogenous dose in the target. However, the higher doses associated with these techniques are a reason for concern because they may increase the dose outside the target. In the present study, we compared 3DCRT, IMRT and tomotherapy to assess the doses to organs at risk (OARs) resulting from photon beam irradiation and scattered neutrons. Material and methods. The doses to OARs outside the target were measured in an anthropomorphic Alderson phantom using thermoluminescence detectors (TLD 100) 6Li (7.5%) and 7Li (92.5%). The neutron fluence rate [cm–2·s–1] at chosen points inside the phantom was measured with gold foils (0.5 cm diameter, mean surface density of 0.108 g/cm3). Results. The doses [Gy] delivered to the OARs for 3DCRT, IMRT and tomotherapy respectively, were as follows: thyroid gland (0.62 ± 0.001 vs. 2.88 ± 0.004 vs. 0.58 ± 0.003); lung (0.99 ± 0.003 vs. 4.78 ± 0.006 vs. 0.67 ± 0.003); bladder (80.61 ± 0.054 vs. 53.75 ± 0.070 vs. 34.71 ± 0.059); and testes (4.38 ± 0.017 vs. 6.48 ± 0.013 vs. 4.39 ± 0.020). The neutron dose from 20 MV X-ray beam accounted for 0.5% of the therapeutic dose prescribed in the PTV. The further from the field edge the higher the contribution of this secondary radiation dose (from 8% to ~45%). Conclusion. For tomotherapy, all OARs outside the therapeutic field are well-spared. In contrast, IMRT achieved better sparing than 3DCRT only in the bladder. The photoneutron dose from the use of high-energy X-ray beam constituted a notable portion (0.5%) of the therapeutic dose prescribed to the PTV.
    Źródło:
    Nukleonika; 2017, 62, 1; 29-35
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of entrance skin dose and effective dose from abdomen radiography in two diagnostic facilities in Aba, Abia State, South-East Nigeria
    Autorzy:
    Esu, E. O.
    Chiegwu, H. U.
    Omojola, A. D.
    Eze, E. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839405.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Entrance skin dose (ESD)
    Local diagnostic reference levels (LDRLs)
    Dose area product (DAP)
    Effective dose (E)
    Absorbed dose (DT)
    Thermoluminescent dosimeter (TLD)
    Kilovoltage peak (kVp)
    milliampere-seconds (mAs)
    Opis:
    Medical exposure for abdomen radiography is associated with higher doses compared to X-Rays of the chest and other extremities. The study aims to determine the mean entrance skin dose (ESD) for 104 adult patients between 20-89 years with 2 X-Ray units (A and B) in Aba, South-East Nigeria and to determine the ESD at the 75th percentile to estimate the local diagnostic reference levels (LDRLs). This study also determined the effective dose (E), the dose area product (DAP) and the relationship between absorbed dose (DT) and other parameters. This study will also compare its findings with relevant articles where necessary. The study used 2 functional floors mounted X-Ray units. A total of 208 annealed thermoluminescent dosimeters (TLDs) were used made of Lithium Fluoride, doped with Magnesium and Titanium (LiF: Mg, Ti). Two TLD chips were used per patient. The chips were positioned at the anterior and posterior end of the patient respectively for a given beam area for abdomen radiography. After exposure, a calibrated RadPro TLDcube 400 reader (Freiberg Instrument, Germany) was used to estimate individual patient doses. This was done by multiplying the TLD counts by a pre-determined calibration factor (CF). The mean/75th percentile ESD for facilities A and B was 2.92/4.12 and 3.01/3.67 mGy. The E for facilities A and B was 0.73 and 0.82 mSv respectively. There was a good relationship between the DT with ESD, exit dose (ED) and DAP for facility A, but no relationship was seen with other parameters. The mean ESD was lower compared to the National Council on Radiation Protection and Measurements (NCRP 172) and the American Association of Physicists in Medicine (AAPM) reports respectively. The study proved useful and could serve as a reference point to initiate LDRLs within the South-East zone in Nigeria for abdomen radiography.
    Źródło:
    World Scientific News; 2021, 161; 143-156
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improved dosimetry for BNCT by activation foils, modified thermoluminescent detectors and recombination chambers
    Autorzy:
    Bilski, P.
    Golnik, N.
    Olko, P.
    Pytel, K.
    Tracz, G.
    Tulik, P.
    Zielczyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/971519.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    BNCT
    recombination chambers
    TLD
    activation foils
    Opis:
    Boron neutron capture therapy (BNCT) is an experimental therapy of selected tumours, based on a nuclear reaction initiated by the capture of thermal neutron by the 10B nucleus. After 10B had been delivered selectively to tumour cells, it can be activated by neutrons to deliver locally lethal high-LET radiation. BNCT beams are complex mixed radiation fields, because of broad neutron energy range, presence of gamma contamination and necessity of precise determination of several dose components. The paper presents
    Źródło:
    Nukleonika; 2004, 49, 2; 51-56
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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