{"title":"用8mv x射线进行等心剂量测定。","authors":"E Theodore Agard, J C Pacheco","doi":"","DOIUrl":null,"url":null,"abstract":"<p><p>Tumor-maximum ratios and back-scatter factors were measured for 8 MV x-rays. The measured TMR's are found to conform to the empirical expression TMR(t) = K(t) At m(t). Hence, log-log plots of TMR vs. area at various depths in water, yield straight lines from which values of TMRo (for 0 x 0 cm2 field) are obtained by extrapolation. From these values, scatter-phantom ratios are also derived.</p>","PeriodicalId":76463,"journal":{"name":"Revista interamericana de radiologia","volume":"5 1","pages":"21-4"},"PeriodicalIF":0.0000,"publicationDate":"1980-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Isocentric dosimetry with 8 MV X-rays.\",\"authors\":\"E Theodore Agard, J C Pacheco\",\"doi\":\"\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>Tumor-maximum ratios and back-scatter factors were measured for 8 MV x-rays. The measured TMR's are found to conform to the empirical expression TMR(t) = K(t) At m(t). Hence, log-log plots of TMR vs. area at various depths in water, yield straight lines from which values of TMRo (for 0 x 0 cm2 field) are obtained by extrapolation. From these values, scatter-phantom ratios are also derived.</p>\",\"PeriodicalId\":76463,\"journal\":{\"name\":\"Revista interamericana de radiologia\",\"volume\":\"5 1\",\"pages\":\"21-4\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1980-01-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Revista interamericana de radiologia\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Revista interamericana de radiologia","FirstCategoryId":"1085","ListUrlMain":"","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
摘要
在8 MV x射线下测量肿瘤最大比值和后向散射因子。测量得到的TMR符合经验表达式TMR(t) = K(t) At m(t)。因此，不同水深的TMR与面积的对数-对数图产生直线，通过外推获得TMRo值(对于0 x 0 cm2的油田)。根据这些值，也可以推导出散射-幻像比。
Tumor-maximum ratios and back-scatter factors were measured for 8 MV x-rays. The measured TMR's are found to conform to the empirical expression TMR(t) = K(t) At m(t). Hence, log-log plots of TMR vs. area at various depths in water, yield straight lines from which values of TMRo (for 0 x 0 cm2 field) are obtained by extrapolation. From these values, scatter-phantom ratios are also derived.
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