CAJ | 학술논문

目的探讨利用人体仿真头模对瓦里安直线加速器机载影像系统进行质控的方法.方法将人体仿真头模按常规方法进行CT模拟、计划设计、治疗摆位、锥形束CT扫描和千伏特正交片位置验证等过程,1次/d,连续10 d并对位置偏差的结果进行分析.结果连续10次锥形束CT验证模拟靶在纵、垂直、横、旋转方向的误差分别为(0.06±0.11)、(0.03±0.05)、(0.07±0.07)、(0.03±0.10)cm,连续10次千伏特正交片验证的分别为(0.04±0.010)、(0.03±0.05)、(0.08±0.06)、(0.05±0.05)cm,两种方法验证结果显示差异无统计学意义(纵向比t=0.44,P=0.667;垂直向比t=0.00,P=1.000;横向比t=0.34,P=0.735;旋转向比t=0.58,P=0.568).结论研究之加速器机载影像系统稳定可靠,状态良好.利用人体仿真头模模拟实际治疗过程对机载影像系统进行质控,是一种简便易行、结果可靠的有效方法,具有推广应用价值.
목적 탐토이용인체방진두모대와리안직선가속기궤재영상계통진행질공적방법.방법 장인체방진두모안상규방법진행CT모의、계화설계、치료파위、추형속CT소묘화천복특정교편위치험증등과정,1차/d,련속10 d병대위치편차적결과진행분석.결과 련속10차추형속CT험증모의파재종、수직、횡、선전방향적오차분별위(0.06±0.11)、(0.03±0.05)、(0.07±0.07)、(0.03±0.10)cm,련속10차천복특정교편험증적분별위(0.04±0.010)、(0.03±0.05)、(0.08±0.06)、(0.05±0.05)cm,량충방법험증결과현시차이무통계학의의(종향비t=0.44,P=0.667;수직향비t=0.00,P=1.000;횡향비t=0.34,P=0.735;선전향비t=0.58,P=0.568).결론 연구지가속기궤재영상계통은정가고,상태량호.이용인체방진두모모의실제치료과정대궤재영상계통진행질공,시일충간편역행、결과가고적유효방법,구유추엄응용개치.
Objective To study the method of using phantom test for daily quality assurance of on board image(OBI) system. Methods The routine procedures of radiotherapy, including CT simulation, planning,setup,cone beam CT(CBCT) scan and kilovolt X-ray orthogonal film were carried out on a head phantom. The procedures repeated once a day in the following 10 days. The geometric errors of the phantom were recorded. Results The geometric errors of the phantom by CBCT were [0.06±0.11] cm, [0.03±0.05] cm, [0.07±0.07] cm and [0.03±0.10] cm in longitudinal, vertical, lateral and rotation directions, respectively. The geometric errors of the phantom by kilovolt X-ray orthogonal film were [ 0.04±0.10] cm, [0.03±0.05] cm, [0.08±0.06] cm and [0.05±0.05] cm, respectively. The differences of geometric errors of the phantom by CBCT and kilovolt X-ray orthogonal film were not significant(t = 0.44,P=0.667 in longitudinal direction ; t=0.00, P=1.060 in vertical direction ; t=0.34, P=0.735 in lateral direction; t=0.58,P=0.568 in rotation direction). Conclusions The OBI system of our accelerator is reliable and at excellent performance status. The method by using phantom test for the daily quality assurance of OBI system is easy and reliable.