Sharma Jibon, Sarma Jogesh, Agarwal Sushant
Department of Radiation Oncology, State Cancer Institute, Gauhati Medical College, Guwahati, Assam, India.
Department of Pulmonary Medicine, Gauhati Medical College, Guwahati, Assam, India.
J Med Phys. 2018 Jul-Sep;43(3):200-203. doi: 10.4103/jmp.JMP_37_18.
Radiological imaging is an important modality of today's overall practicum. Imaging can begin as early as the 1 day of life. Neonates are 3-4 times more sensitive to radiation than adults. The purpose of the work was to assess the diagnostic reference level (DRL), the radiation organ dose, and effective organ dose for both sexes from chest anteroposterior radiograph, which is the most common radiographic examination performed at the Neonatal Intensive Care Unit (NICU). The entrance air kerma was measured using a solid-state PIN type detector, and the value was used as the input factor to PCXMC-2.0 software to calculate the entrance surface air kerma (ESAK), patient-specific organ dose, and effective dose originated from chest anteroposterior examinations of neonates at NICU. The mean value of ESAK is taken as a diagnostic reference level (DRL) for neonates (both male and female). The mean ESAK value of male neonates is (79.6 ± 1.4) μGy and for female is (79.9 ± 1.9) μGy, and the institutional diagnostic reference level (DRL) is 80.35 μGy for male and 81.2 μGy for female (i.e., third quartile value). A statistical dependency (correlation) between neonates body mass index (BMI) and ESAK was defined for both the sexes. Significant positive correlation was found between ESAK per patient with respect to BMI of both male (R = 0.83, = 0.00001) and female (R = 0.72, = 0.00055) neonates. The results for neonatal dose in NICU were compatible with the literature. The result presented will serve as baseline data for the selection of technical parameters in neonatal chest anteroposterior X-ray examination.
放射成像在当今的整体临床实习中是一种重要的检查方式。成像最早可在出生后第1天开始。新生儿对辐射的敏感度是成年人的3至4倍。这项工作的目的是评估胸部前后位X线片对两性的诊断参考水平（DRL）、辐射器官剂量和有效器官剂量，胸部前后位X线片是新生儿重症监护病房（NICU）最常进行的X线检查。使用固态PIN型探测器测量空气比释动能入射量，并将该值作为输入参数输入到PCXMC - 2.0软件中，以计算空气比释动能表面入射量（ESAK）、特定患者的器官剂量以及源自NICU新生儿胸部前后位检查的有效剂量。ESAK的平均值被用作新生儿（男性和女性）的诊断参考水平（DRL）。男性新生儿的ESAK平均值为（79.6 ± 1.4）μGy，女性为（79.9 ± 1.9）μGy，机构诊断参考水平（DRL）男性为80.35 μGy，女性为81.2 μGy（即第三四分位数）。确定了两性新生儿体重指数（BMI）与ESAK之间的统计相关性（关联性）。发现男性（R = 0.83，P = 0.00001）和女性（R = 0.72，P = 0.00055）新生儿的每位患者ESAK与BMI之间存在显著正相关。NICU中新生儿剂量的结果与文献相符。所呈现的结果将作为新生儿胸部前后位X线检查技术参数选择的基线数据。
