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inverse plan
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  逆向计划
     Methods (1) To verify if the dose calculation of inverse plan was accurate, absolute dose at a certain point of the 42 cases patient s IMRT treatment plan were measured with water phantom transference in an ionization chamber so as to further make sure calibration factor of the inverse planning system.
     方法  (1)通过体模移植的方法分别用电离室在水模体中测量 4 2例病人的IMRT治疗计划某点的绝对剂量 ,验证逆向计划系统剂量计算的准确性 ,进一步修正它的计算校正因子。
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  相似匹配句对
     plan;
     计划(策划);
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     From Plan to Section
     从平面到剖面
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     Inverse Scattering
     电磁逆散射
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     INVERSE MICROEMULSION POLYMERIZATION
     反相微乳液聚合
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Objectives:To verify the dose accuracy a nd explo re for effective quality assurance(QA)procedure and measures of Peaco ck MIMic IMRT.Methods :(1)Conducting hybrid plans using phant om geometry a nd 43cases patient ' s incident beam fluence for peacock MIMic IMRT,with 10 5°~255°arc,beaml et changed every 5°for each case.Irradiation dose we re measure d by ionization chamber to verify the dose calculation of the inverse plan ning and the reliability of total dose output of I MRT devices.(2)Dose...

Objectives:To verify the dose accuracy a nd explo re for effective quality assurance(QA)procedure and measures of Peaco ck MIMic IMRT.Methods :(1)Conducting hybrid plans using phant om geometry a nd 43cases patient ' s incident beam fluence for peacock MIMic IMRT,with 10 5°~255°arc,beaml et changed every 5°for each case.Irradiation dose we re measure d by ionization chamber to verify the dose calculation of the inverse plan ning and the reliability of total dose output of I MRT devices.(2)Dose distribution was measured repeatedly where the gradient was largest in the plan for testing the effect of positioning incorrectness.Results:(1)Relative di fference between measur ed dose and planned dose are within -0.74%~4.9 8%for all 43cases,average di fference was 2.38%,standard deviation wa s 1.39%and standard error was 0.21%.(2)Measured dose gradient was consiste nt with planning.Maximum measured dose difference of repeat p ositioni ng at the most gradient poin t was 1.97%,where the gradient was 15mm per centimeter and largest in all 43case s.Conclusion:Hybrid plan testing is ef ficient for dosi metry verification of IMRT planning and implementing.which sh ould be used as a QA procedure before e very patient ' s treatment.Additional p ositioning accuracy of less then 1m m would be necessary when doing IMRT.

目的:检验调强适形放射治疗IntensitymodulatetradiationtherapyIMRT的剂量误差,探索IMRT的质量控制和质量保证的措施和方法。方法:1用体模治疗计划移植的方法对43例IMRT治疗计划的照射区以电离室作实际物理剂量测量,以验证治疗计划系统剂量计算的准确性,照射设备的可靠性和稳定性,修正IMRT治疗剂量误差和确定其剂量精度范围。2选取计划照射区内剂量梯度变化较大处进行重复摆位测量剂量,推算和验证由于摆位误差可能造成的剂量误差。结果:1与计划剂量比较,实际测量剂量的相对误差范围为-0.74%~4.98%并近似正态分布,平均误差为2.38%,标准差为1.39%,标准误为0.21%。全部43例的剂量误差均在5%以内。2实际测量的剂量梯度变化与计划剂量梯度一致。全部计划中的最大梯度值为15%/mm。在该处重复摆位测量的最大与最小值的相对差别为1.97%。结论:用体模计划移植测量方法能有效检验IMRT计划计算和执行的误差,可作为每个病人治疗前的剂量验证常规方法;IMRT治疗精度的保证需要优于1mm的额外精确摆位。

Objective To introduce and investigate the method of quality assurance and quality control of Intensity modulation radiation therapy. Methods (1) To verify if the dose calculation of inverse plan was accurate, absolute dose at a certain point of the 42 cases patient s IMRT treatment plan were measured with water phantom transference in an ionization chamber so as to further make sure calibration factor of the inverse planning system. (2) To verify the longitudinal symmetry of MIMiC devices and...

Objective To introduce and investigate the method of quality assurance and quality control of Intensity modulation radiation therapy. Methods (1) To verify if the dose calculation of inverse plan was accurate, absolute dose at a certain point of the 42 cases patient s IMRT treatment plan were measured with water phantom transference in an ionization chamber so as to further make sure calibration factor of the inverse planning system. (2) To verify the longitudinal symmetry of MIMiC devices and the transverse reliability and stability of the MIMiC leaves, a piece of film between two homogeneous polystyrene boards was irradiated every week.Results (1) Measured relative error was within 3%, therefore we needn t modify the inverse planning system calibration factor. (2) The error of the film verification weekly was within 1mm. Thus the MIMiC devices needn t be adjusted.Conclusions The measure of quality assurance and dose verification of IMRT was feasible according to our experience in one year or so.

目的 介绍和探讨调强适形放射治疗的质量保证和质量控制方法。方法  (1)通过体模移植的方法分别用电离室在水模体中测量 4 2例病人的IMRT治疗计划某点的绝对剂量 ,验证逆向计划系统剂量计算的准确性 ,进一步修正它的计算校正因子。 (2 )为验证MIMiC纵向的对称性、叶片横向的可靠性、稳定性 ,把剂量胶片放在两块有机玻璃板之间每周拍摄验证片。结果  (1)测量所得的相对误差均在 3%以内 ,故逆向计划系统计算校正因子不需进行修正。 (2 )每周胶片验证的结果偏差均小于 1mm ,则无需对其进行机械调整。结论 近一年的IMRT工作实践证明所采用的质量保证和剂量验证措施是可行。

 
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