利用模拟和系列射野片测量来确定放射治疗中患者体位可变性的改进方法。

Improved methods for determination of variability in patient positioning for radiation therapy using simulation and serial portal film measurements.

作者信息

Rosenthal S A, Galvin J M, Goldwein J W, Smith A R, Blitzer P H

机构信息

Department of Radiation Oncology, University of Pennsylvania, Philadelphia 19104.

出版信息

Int J Radiat Oncol Biol Phys. 1992;23(3):621-5. doi: 10.1016/0360-3016(92)90020-i.

DOI:10.1016/0360-3016(92)90020-i

PMID:1612962

Abstract

Variability in patient positioning was determined by analyzing simulation and portal film measurements for 318 portals in 51 patients treated with external beam radiotherapy to the head and neck. Several indicators of error in patient positioning were examined: random error, a measure of the deviation of all portal films from the average portal film position, systematic error, a measure of the difference between the average portal film and the simulation film, and total uncertainty, a measure of the overall deviation, including both random and systematic uncertainties. The median differences noted were 0.4 cm, 0.6 cm, and 0.7 cm, for Random Error, Systematic Error, and Total Uncertainty, respectively. The treatment fields analyzed in this study show a substantial treatment-to-treatment and simulation-to-treatment variability in patient positioning. The methods described provide an improved means for the systematic analysis of variability in patient positioning.

摘要

通过分析51例接受头颈部外照射放疗患者的318个射野的模拟和射野片测量结果，确定了患者摆位的可变性。研究了患者摆位误差的几个指标：随机误差，即所有射野片相对于平均射野片位置的偏差度量；系统误差，即平均射野片与模拟片之间差异的度量；总不确定度，即包括随机和系统不确定度在内的总体偏差度量。随机误差、系统误差和总不确定度的中位数差异分别为0.4厘米、0.6厘米和0.7厘米。本研究分析的治疗野显示出患者摆位在不同治疗之间以及模拟与治疗之间存在显著的可变性。所描述的方法为系统分析患者摆位的可变性提供了一种改进手段。