Persliden J, Sandborg M
Department of Radiation Physics, Faculty of Health Sciences, University of Linköping, Sweden.
Acta Radiol. 1993 Jan;34(1):92-8.
Conversion factors between the energy imparted to the patient in pediatric radiography and air collision kerma integrated over beam area are presented. The values have been derived from Monte Carlo calculations in soft tissue phantoms and extend results published earlier to cover children from early infancy to the age of 15 years. Variations related to phantom size as well as to focus-phantom distance, radiation field size, orientation of view (a.p., lateral), tube potential, and beam filtration are given. We show that the conversion factor increases with increasing half-value layer of the X-ray beam and the anterioposterior width of the simulated child. Increasing the focus-phantom distance increases the conversion factor, while increasing the field size decreases the factors due to more scattered radiation escaping laterally from the phantom.
给出了儿科放射成像中 imparted 给患者的能量与在射束面积上积分的空气比释动能之间的转换系数。这些值源自软组织体模中的蒙特卡罗计算，并扩展了先前发表的结果，以涵盖从婴儿早期到15岁的儿童。给出了与体模大小以及焦点 - 体模距离、辐射野大小、观察方向（前后位、侧位）、管电压和射束过滤相关的变化。我们表明，转换系数随着X射线束半价层以及模拟儿童前后径的增加而增加。增加焦点 - 体模距离会增加转换系数，而增加野大小会降低系数，这是因为更多的散射辐射从体模侧向逸出。 注：“imparted”在这里根据语境大概是“传递、给予”的意思，但在医学专业中可能有更准确特定含义，你可根据实际专业背景进一步确认。
