Izawa Maki, Harata Yasuo, Shiba Noriyoshi, Koizumi Nobuhide, Ozawa Tomonori, Takahashi Nobutoshi, Okumura Yasuhiko
Division of Dental Radiology, Department of Diagnostic and Therapeutic Science, Meikai University School of Dentistry, 1-1 Keyakidai, Sakadoshi, Saitama 350-0283 Japan.
Oral Radiol. 2017;33(1):38-44. doi: 10.1007/s11282-016-0245-9. Epub 2016 May 3.
To investigate the dosage and imaging conditions for patients undergoing intraoral radiography at Meikai University Hospital and establish assurance and quality control data.
Tube voltage, exposure time, and air kinetic energy released per unit mass (air kerma) of three intraoral radiography units were measured. To calculate the patient entrance dose (PED) for each radiograph using Insight film, we extracted data for 1063 patients from their exposure records. The PED was compared with the diagnostic reference level (DRL) from the European Commission and the UK.
The tube voltage of the three units was maintained at 60 ± 2 kV. Differences in exposure time were less than 1.7 % for all units. The air kerma rates were well maintained within a 4.2 % error. Based on the patient data, there were no significant differences in the mean exposure times for males and females for all anatomical sites. The mean PED ranged from 1.09 ± 0.31 mGy for the mandibular incisors to 2.42 ± 0.33 mGy for the maxillary molars. The mean PED at the mandibular molars using InSight film was 1.59 ± 0.20 mGy, being less than the recommended value based on the DRL for intraoral radiography in the UK.
We concluded that radiographic conditions at the hospital have been properly maintained. This basic quality control data may assist other dental radiation facilities to reduce patient dosage.
调查明海大学医院口腔内放射成像患者的剂量及成像条件，并建立保证措施和质量控制数据。
测量了三个口腔内放射成像设备的管电压、曝光时间和单位质量空气比释动能（空气比释动能）。为使用Insight胶片计算每张X光片的患者入射剂量（PED），我们从1063名患者的曝光记录中提取了数据。将PED与欧盟委员会和英国的诊断参考水平（DRL）进行比较。
三个设备的管电压维持在60±2 kV。所有设备的曝光时间差异小于1.7%。空气比释动能率误差控制在4.2%以内。根据患者数据，所有解剖部位的男性和女性平均曝光时间无显著差异。下颌切牙的平均PED为1.09±0.31 mGy，上颌磨牙为2.42±0.33 mGy。使用Insight胶片时下颌磨牙的平均PED为1.59±0.20 mGy，低于英国口腔内放射成像DRL的推荐值。
我们得出结论，该医院的放射成像条件保持良好。这些基本质量控制数据可能有助于其他牙科放射设施降低患者剂量。
