Svalkvist Angelica, Söderman Christina, Båth Magnus
Department of Medical Physics and Biomedical Engineering, Sahlgrenska University Hospital, SE-413 45 Gothenburg, Sweden Department of Radiation Physics, Institute of Clinical Sciences, The Sahlgrenska Academy at University of Gothenburg, SE-413 45 Gothenburg, Sweden
Department of Radiation Physics, Institute of Clinical Sciences, The Sahlgrenska Academy at University of Gothenburg, SE-413 45 Gothenburg, Sweden.
Radiat Prot Dosimetry. 2016 Jun;169(1-4):274-80. doi: 10.1093/rpd/ncv498. Epub 2015 Dec 15.
The purposes of the present work were to calculate the average effective dose to patients from lateral tomosynthesis examinations of the thoracic spine, compare the results with the corresponding conventional examination and to determine a conversion factor between dose-area product (DAP) and effective dose for the tomosynthesis examination. Thoracic spine examinations from 17 patients were included in the study. The registered DAP and information about the field size for each projection radiograph were, together with patient height and mass, used to calculate the effective dose for each projection radiograph. The total effective doses for the tomosynthesis examinations were obtained by adding the effective doses from the 60 projection radiographs included in the examination. The mean effective dose was 0.47 mSv (range 0.24-0.81 mSv) for the tomosynthesis examinations and 0.20 mSv (range 0.07-0.29 mSv) for the corresponding conventional examinations (anteroposterior + left lateral projection). For the tomosynthesis examinations, a conversion factor between total DAP and effective dose of 0.092 mSv Gycm(-2) was obtained.
本研究的目的是计算胸椎侧位断层合成检查对患者的平均有效剂量，将结果与相应的传统检查进行比较，并确定断层合成检查中剂量面积乘积（DAP）与有效剂量之间的转换因子。该研究纳入了17例患者的胸椎检查。记录的DAP以及每张投影X光片的视野大小信息，连同患者的身高和体重，用于计算每张投影X光片的有效剂量。断层合成检查的总有效剂量通过将检查中包含的60张投影X光片的有效剂量相加得到。断层合成检查的平均有效剂量为0.47 mSv（范围0.24 - 0.81 mSv），相应传统检查（前后位 + 左侧位投影）的平均有效剂量为0.20 mSv（范围0.07 - 0.29 mSv）。对于断层合成检查，总DAP与有效剂量之间的转换因子为0.092 mSv Gycm(-2)。
