SunNuclear三维水箱特点课件

Title,ABC,ABC,ABC,ABC,ABC,Title,ABC,ABC,ABC,ABC,ABC,Advantages of a 3D Cylindrical Water Scanner,Max Tang,Medical Physicist,Advantages of a 3D Cylindrical,Outline,TG 106,介绍以及数据采集,常见问题,3DS,水箱特点,圆筒状箱体设计,AutoSetup,自动摆位功能,OutlineTG 106介绍以及数据采集,TG-106,This task group was formed to review the physics of commissioning linear accelerators and to provide guidelines and recommendations on proper selection of detector,phantom,and methods to reduce measurement errors below,1%,in beam data acquisition.,AAPM Task Group 106“Accelerator beam data commissioning equipment and procedures:Report of the TG-106 of the Therapy Physics Committee of the AAPM,”Med Phys 35(9):4186-4215,Sept 2008.,TG-106This task group was form,TG-106,III.B.Scanning water tank,III.B.1.Positioning and labeling,III.B.2.,Scanner movement,III.B.3,.Orientation,III.C.,Scan mechanism and movement,III.C.1.Array detector weight,III.C.2.,Speed and position accuracy,III.C.3.Hysteresis,III.C.4.Corrosion,III.E.Data acquisition,III.E.1.Scanning parameter protocol,III.E.2.,Speed,III.E.3.,Delay time,III.E.4.Sampling time and signal,III.E.5.Radio frequency noise interference,TG-106III.B.Scanning water ta,足够大的扫描范围,:,Diagonal profiles of 40 x40 cm2 with lateral buildup 5cm&over scans.,Suggested 75x75 cm2 in transverse size.,The half field scan be extended 5 cm past the central axis.,相对较小体积的探头,:,Ion chambers with small volumes are generally preferred.,Ref.detector shall be used for removing the instantaneous fluctuations or drifts in the incident beam output.,稳定的扫描结果,:,The chamber shall scan with the least amount of moving parts;,Orient the detector mount so that it provides the highest resolution.,Precautions:“,Do not scan in the axial direction of the detector,.”,Adjust the step size to optimize the time and accuracy.,TG106 Highlights,-Scanner in Accelerator beam data commissioning,足够大的扫描范围:TG106 Highlights,三维水箱探头的选择,电离室,-,体积效应,半导体,-,剂量，能量，剂量率响应,There are,conicting,publications on the use of diode detectors for beam data acquisition,hence,before using a diode detector,one should compare it with ion chamber measurements to conrm its correct operation and accuracy in data.-AAPM TG106,三维水箱探头的选择电离室-体积效应,AAPM TG106,AAPM TG106,AAPM TG106,AAPM TG106,AAPM TG106,AAPM TG106,电离室的体积效应,Volumn averaging effect,剂量高估,剂量低估,剂量准确,电离室的体积效应 Volumn averaging effe,“,Detector orientation plays an important role in profiles and penumbra measurements,”,TG106,AAPM TG 106,“Detector orientation plays a,圆形水箱的优势，扫描方向的一致性,Solution:Cylindrical design with ring drive mechanism,圆形水箱的优势，扫描方向的一致性Solution:Cyli,方形水箱扫描,10 x10,的,Cross-line,和,In-line Profile,的对比,方形水箱扫描10 x10的Cross-line和In-line,SNC,125c,TM,Specifications,SNC 125cTM Specifications,The SNC125c is oblong to provide a sharper penumbra with the same signal.This chamber is designed longer to work in the 3D SCANNER with the rotating diameter drive to always keep the chamber in the ideal orientation.its almost like having the signal of a 0.125cc with a penumbra closer to a micro chamber.,Chamber Comparisons,IBA CC13,内空腔截面,SNC 125C,内空腔截面,The SNC125c is oblong to provi,Positioning reproducibility with AutoSetup,Day 1:,An experienced user positioned the tank under the Linac,filled it,used AutoSetup,acquired three profiles,then emptied the tank and put it to the side.The Linac was used clinically for the day.,Day 2:,A novice user(trained only once,a month before)put the tank back into position under the Linac,filled it,used AutoSetup,and acquired the same three profiles.,Results:,If you look closely you can see there are 2 profile sets,but the profiles overlap almost perfectly!An experienced user and a novice user get repeatable results with AutoSetup.(Note:no processing was done to these profiles).,Positioning reproducibility wi,3DS,水箱的物理尺寸,Tank volume large enough to ensure sufficient backscatter thus,allowing the system to be used for RTPS commissioning.,3DS水箱的物理尺寸Tank volume large en,圆形水箱的优势之一，有效的利用空间,。,3D-Scanner 166L 65cm,（使用,offset holder,）,VS,Square Tank 190L 48cm,圆形水箱的优势之一，有效的利用空间。3D-Scanner,40 x 40 cm field at SSD 100 and Depths 30,20,10,5,1.53cm,无需平移水箱即可以将,40 x40cm field,的,Profile,完整测量,使用,Off set Hold,，,3DS,最大扫描范围为,65cm,40 x 40 cm field at SSD 100 a,3DS,运动方式,3DS运动方式,3,DS,是目前唯一能实现,AutoSetup,自动摆位功能的三维水箱,3DS是目前唯一能实现AutoSetup自动摆位功能的三维水,传统水箱摆位调整流程,手动调节水平：通过水平移动探头来调节水箱或移动支架的水平,手动调节探头移动方向角度：将使用狭长,beam,，通过观察探头与,beam,边界关系来旋转水箱或,Collimator,。,手动将探头调节至水面原点,手动或自动调节探头至,beam,的中心点,传统水箱摆位调整流程手动调节水平：通过水平移动探头来调节水箱,3,D-Scanner,自动摆位功能（,Auto Set-Up,）,自动调节水箱水平,自动调节探头到水箱中心位置,自动寻找并调节水箱中心与,Field center,重合,自动调节水箱的扫描角度，使扫描方向与,Field,边界平行或垂直,自动将寻找水面并将探头移动至水面作为原点,3D-Scanner自动摆位功能（Auto Set-Up）,使用电动水平台和水面探测器来实现自动摆位,电动水平台,与水箱无缝衔接,四个步进电机,stepper motors,水平调节点,一个固定支点,两个可调节,:5 mm,x,和,y,轴水平移动,移动范围,30 mm,水面探测器,使用电动水平台和水面探测器来实现自动摆位电动水平台水面探测,自动调节水平,Auto leveling takes three water measurements to determine the leveling required,自动调节水平Auto leveling takes thre,自动调节水平,计算机会自动计算出需要水平水箱需要调节的角度,自动调节水平计算机会自动计算出需要水平水箱需要调节的角度,自动寻找,Beam Center,3,DS,可以通过扫描数据来确定,Beam Center,.,自动寻找Beam Center3DS可以通过扫描