Staton Robert J, Jones A Kyle, Lee Choonik, Hintenlang David E, Arreola Manuel M, Williams Jonathon L, Bolch Wesley E
Department of Nuclear and Radiological Engineering, University of Florida, Gainesville, Florida 32611-8300, USA.
Med Phys. 2006 Sep;33(9):3283-9. doi: 10.1118/1.2256687.
Following the recent completion of a tomographic physical newborn dosimetry phantom with incorporated metal-oxide-semiconductor field effect transistor (MOSFET) dosimetry system, it was necessary to derive scaling factors in order to calculate organ doses in the physical phantom given point dose measurements via the MOSFET dosimeters (preceding article in this issue). In this study, we present the initial development of scaling factors using projection radiograph data. These point-to-organ dose scaling factors (SF(POD)) were calculated using a computational phantom created from the same data set as the physical phantom, but which also includes numerous segmented internal organs and tissues. The creation of these scaling factors is discussed, as well as the errors associated when using only point dose measurements to calculate mean organ doses and effective doses in physical phantoms. Scaling factors for various organs ranged from as low as 0.70 to as high as 1.71. Also, the ability to incorporate improvements in the computational phantom into the physical phantom using scaling factors is discussed. An comprehensive set of SF(POD) values is presented in this article for application in pediatric radiography of newborn patients.
随着近期一个包含金属氧化物半导体场效应晶体管（MOSFET）剂量测定系统的断层新生儿物理剂量测定体模的完成，有必要推导比例因子，以便根据通过MOSFET剂量计进行的点剂量测量来计算物理体模中的器官剂量（本期上一篇文章）。在本研究中，我们展示了使用投影射线照片数据进行比例因子的初步开发。这些点到器官的剂量比例因子（SF(POD)）是使用从与物理体模相同的数据集创建的计算体模计算得出的，但该计算体模还包括许多分割的内部器官和组织。本文讨论了这些比例因子的创建，以及仅使用点剂量测量来计算物理体模中的平均器官剂量和有效剂量时相关的误差。各个器官的比例因子范围低至0.70高至1.71。此外，还讨论了使用比例因子将计算体模中的改进纳入物理体模的能力。本文给出了一套全面的SF(POD)值，用于新生儿患者的儿科放射成像。
