CAJ | 학술논문

目的：通过Delta4高分辨率模式研究空间分辨率变化对剂量验证γ通过率的影响。方法：随机选取11例鼻咽癌制定VMAT治疗计划，利用Delta4自带的Merge功能获取3组不同分辨率的实测剂量分布，分别为原始分辨率组和高分辨率组（offset＝2．5 mm和offset＝5 mm），利用SPSS软件对3组实测数据进行统计学分析。结果：2种高分辨率组的剂量测量点较原始分辨率组均有不同程度的增加；高分辨率组offset为5 mm的γ分析通过率较offest为2．5 mm的稍低，但两者均低于原始分辨率组，差异无统计学意义。结论：利用Delta4的Merge功能可以获取更多的剂量测量点参与剂量比较，验证结果更加真实可靠，一般情况下可替代传统胶片验证。
목적：통과Delta4고분변솔모식연구공간분변솔변화대제량험증γ통과솔적영향。방법：수궤선취11례비인암제정VMAT치료계화，이용Delta4자대적Merge공능획취3조불동분변솔적실측제량분포，분별위원시분변솔조화고분변솔조（offset＝2．5 mm화offset＝5 mm），이용SPSS연건대3조실측수거진행통계학분석。결과：2충고분변솔조적제량측량점교원시분변솔조균유불동정도적증가；고분변솔조offset위5 mm적γ분석통과솔교offest위2．5 mm적초저，단량자균저우원시분변솔조，차이무통계학의의。결론：이용Delta4적Merge공능가이획취경다적제량측량점삼여제량비교，험증결과경가진실가고，일반정황하가체대전통효편험증。
Objective: To study the impact of spatial resolution of measurement on Gamma rate in the dose verification through the Delta4 high resolution mode.Methods: 11 volume modulated arc therapy ( VMAT ) treatment plans of nasopharyngeal carcinoma were randomly chosen, and 3 groups of measured dose distribution with different resolution for each patient, including a original resolution group and two high resolution groups ( offset =2.5 mm and offset=5 mm) , were obtained by Delta4 using the Merge function.In addition, the paired t-test with SPSS software was applied for the three groups of data.Results: The number of measured dose points of the two high resolution groups increased in different degrees, compared with the original resolution group;the Gamma rate of the high resolution group with 5 mm offset was slightly lower than that of the group with 2.5 mm offset, besides, the Gamma rates of both high resoulution groups were lower than that of the original resolution group, which had no significant difference.Conclusion:More measured dose points can be accessed by the Merge function of Delta4 to obtain more reliable dose verification results, furthermore, the traditional film can be replaced in dose verification under general conditions.