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    Wyświetlanie 1-2 z 2
    Tytuł:
    Quality control test of conventional X-Ray systems in Delta State, South-South, Nigeria
    Autorzy:
    Ijabor, B. O.
    Nzotta, C. C.
    Omojola, A. D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193452.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Digital Radiography (DR)
    Focus to Image Distance (FID)
    Half Value Layer (HVL)
    Practical Peak Voltage (PPV)
    Quality Assurance
    Quality Control
    Silicon Photodiode
    Opis:
    The quality assurance (QA) and quality control (QC) programmes of imaging equipment are key ingredients of a quality system. This study is aimed at measuring X-Ray machine parameters and comparing them with the American Association of Physicists in Medicine (AAPM) report No. 74. Also, this study made comparison with similar articles locally and internationally. The study was conducted in 12 X-Ray unit (A-L) located in Delta State. A MagicMax Universal Basic Unit was used alongside an XR Multidetector (silicon photodiode) to measure dose, dose rate, practical peak voltage (PPV), exposure time, current in milliampere (mA) and quantity (Q) in milliampere seconds (mAs). The XR Multidetector was positioned at 100 cm from the focus to image distance (FID) to make most measurements. Six (6) X-Ray units were above 20 years, accounting for 50% of the total X-Ray units used. 30% of X-Ray units > 20 years failed the QC test, which was 2.3 times higher than X-Ray units < 10 and 10-20 years respectively. On the average, 55% pass mark was achieved in the 12 X-Ray units across the state, while 26.11% of the test could not be done due to bad knobs and other challenges. Two (2) X-Ray units with an average age of 3 years, passed all the test. The study showed that many of the X-Ray units were old and certain machine parameters could not be assessed. The study also reveal that most X-Ray specifications manual were either misplaced or missing. Continuing QC programme is highly recommended in the studied areas.
    Źródło:
    World Scientific News; 2021, 157; 140-153
    2392-2192
    Pojawia się w:
    World Scientific News
    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
      Wyświetlanie 1-2 z 2

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