Elbakri Idris A
Division of Medical Physics, CancerCare Manitoba, 675 McDermot Ave, Winnipeg, MB, Canada R3E 0V9.
Radiat Prot Dosimetry. 2014 Jan;158(1):43-50. doi: 10.1093/rpd/nct192. Epub 2013 Jul 28.
Dose-area product-to-effective dose (E) conversion factors for chest, abdomen and abdomen-chest neonatal radiographs were computed. Seven patient models in the Monte Carlo software, PCXMC, were defined, representing neonates ranging in weight from 0.5 to 6.0 kg. Conversion factors for a tube potential range of 50-80 kVp at two beam filtrations (3.0 mm Al and 3.0 mm Al+0.1 mm Cu) were calculated. For 133 neonatal radiographs, effective dose values determined using these conversion factors were compared with those obtained from PCXMC simulations customised for each radiograph. For a 3.0-kg newborn irradiated at 60 kVp/3.0 mm Al beam filtration, the conversion factors were 2.58, 1.90 and 1.91 μSv (mGy cm(2))(-1) for chest, chest-abdomen and abdomen radiographs, respectively. Average dose difference between the conversion factors and customised dose calculations was 16 %. Disagreement in effective dose was most strongly correlated with under-collimation in the lateral direction.
计算了胸部、腹部及胸腹联合新生儿X光片的剂量面积乘积与有效剂量（E）转换因子。在蒙特卡洛软件PCXMC中定义了7种患者模型，代表体重范围为0.5至6.0千克的新生儿。计算了在两种射线束过滤条件（3.0毫米铝和3.0毫米铝 + 0.1毫米铜）下50 - 80千伏峰值管电压范围内的转换因子。对于133张新生儿X光片，将使用这些转换因子确定的有效剂量值与通过为每张X光片定制的PCXMC模拟获得的有效剂量值进行了比较。对于在60千伏峰值/3.0毫米铝射线束过滤条件下照射的3.0千克新生儿，胸部、胸腹联合和腹部X光片的转换因子分别为2.58、1.90和1.91微希沃特每（毫戈瑞·平方厘米）。转换因子与定制剂量计算之间的平均剂量差异为16%。有效剂量的差异与横向准直不足的相关性最强。
