{"title":"用于评估具有不同处方剂量的多个目标体积的治疗计划的广义拟合指数：广义剂量分布拟合指数。","authors":"Lingling Yan PhD, Yingjie Xu MD, Jianrong Dai PhD","doi":"10.1016/j.meddos.2023.10.005","DOIUrl":null,"url":null,"abstract":"<div><h3>Background and Purpose</h3><p>The differential fit index (<em>d</em>FI) and cumulative fit index (<em>c</em>FI) were defined in our previous study to evaluate the fit of isodose surfaces to the target volume. They were only applicable to plans for a single target volume. Therefore, this study aimed to generalize these indices for evaluating plans for multiple target volumes and different prescribed doses.</p></div><div><h3>Materials and Methods</h3><p><em>d</em>FI was redefined as the ratio of the integral dose of the volume occupied by an isodose surface to that of the union of all target volumes. <em>c</em>FI was defined as the integral of <em>d</em>FI from a certain dose level of interest to the prescribed dose to be evaluated. To evaluate the performance of the generalized fit index, brain metastasis, head and neck, lung cancer, liver cancer, and cervical cancer cases were selected. For each case, a pair of plans was designed, with one plan having a better fitting dose distribution. The dose fit of these plans was investigated using <em>c</em>FI, the dose gradient index (GI), and the conformity index (CI).</p></div><div><h3>Results</h3><p>In total, 26 pairs of evaluations were performed. The correct evaluation rates for <em>c</em>FI, GI, and CI were 96%, 26.92%, and 92.31%, respectively, illustrating that GI was not valid for evaluating complex plans.</p></div><div><h3>Conclusions</h3><p>The generalized fit index proved effective for evaluating the dose fit of plans for multiple target volumes with different prescribed doses.</p></div>","PeriodicalId":49837,"journal":{"name":"Medical Dosimetry","volume":"49 2","pages":"Pages 143-149"},"PeriodicalIF":1.1000,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0958394723001012/pdfft?md5=6821b9279324d72b49935e4a7e1c47f1&pid=1-s2.0-S0958394723001012-main.pdf","citationCount":"0","resultStr":"{\"title\":\"A generalized fit index for evaluating treatment plans of multiple target volumes with different prescribed dose: Generalized dose distribution fit index\",\"authors\":\"Lingling Yan PhD, Yingjie Xu MD, Jianrong Dai PhD\",\"doi\":\"10.1016/j.meddos.2023.10.005\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><h3>Background and Purpose</h3><p>The differential fit index (<em>d</em>FI) and cumulative fit index (<em>c</em>FI) were defined in our previous study to evaluate the fit of isodose surfaces to the target volume. They were only applicable to plans for a single target volume. Therefore, this study aimed to generalize these indices for evaluating plans for multiple target volumes and different prescribed doses.</p></div><div><h3>Materials and Methods</h3><p><em>d</em>FI was redefined as the ratio of the integral dose of the volume occupied by an isodose surface to that of the union of all target volumes. <em>c</em>FI was defined as the integral of <em>d</em>FI from a certain dose level of interest to the prescribed dose to be evaluated. To evaluate the performance of the generalized fit index, brain metastasis, head and neck, lung cancer, liver cancer, and cervical cancer cases were selected. For each case, a pair of plans was designed, with one plan having a better fitting dose distribution. The dose fit of these plans was investigated using <em>c</em>FI, the dose gradient index (GI), and the conformity index (CI).</p></div><div><h3>Results</h3><p>In total, 26 pairs of evaluations were performed. The correct evaluation rates for <em>c</em>FI, GI, and CI were 96%, 26.92%, and 92.31%, respectively, illustrating that GI was not valid for evaluating complex plans.</p></div><div><h3>Conclusions</h3><p>The generalized fit index proved effective for evaluating the dose fit of plans for multiple target volumes with different prescribed doses.</p></div>\",\"PeriodicalId\":49837,\"journal\":{\"name\":\"Medical Dosimetry\",\"volume\":\"49 2\",\"pages\":\"Pages 143-149\"},\"PeriodicalIF\":1.1000,\"publicationDate\":\"2023-10-31\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.sciencedirect.com/science/article/pii/S0958394723001012/pdfft?md5=6821b9279324d72b49935e4a7e1c47f1&pid=1-s2.0-S0958394723001012-main.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Medical Dosimetry\",\"FirstCategoryId\":\"3\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0958394723001012\",\"RegionNum\":4,\"RegionCategory\":\"医学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"ONCOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Medical Dosimetry","FirstCategoryId":"3","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0958394723001012","RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ONCOLOGY","Score":null,"Total":0}
A generalized fit index for evaluating treatment plans of multiple target volumes with different prescribed dose: Generalized dose distribution fit index
Background and Purpose
The differential fit index (dFI) and cumulative fit index (cFI) were defined in our previous study to evaluate the fit of isodose surfaces to the target volume. They were only applicable to plans for a single target volume. Therefore, this study aimed to generalize these indices for evaluating plans for multiple target volumes and different prescribed doses.
Materials and Methods
dFI was redefined as the ratio of the integral dose of the volume occupied by an isodose surface to that of the union of all target volumes. cFI was defined as the integral of dFI from a certain dose level of interest to the prescribed dose to be evaluated. To evaluate the performance of the generalized fit index, brain metastasis, head and neck, lung cancer, liver cancer, and cervical cancer cases were selected. For each case, a pair of plans was designed, with one plan having a better fitting dose distribution. The dose fit of these plans was investigated using cFI, the dose gradient index (GI), and the conformity index (CI).
Results
In total, 26 pairs of evaluations were performed. The correct evaluation rates for cFI, GI, and CI were 96%, 26.92%, and 92.31%, respectively, illustrating that GI was not valid for evaluating complex plans.
Conclusions
The generalized fit index proved effective for evaluating the dose fit of plans for multiple target volumes with different prescribed doses.
期刊介绍：
Medical Dosimetry, the official journal of the American Association of Medical Dosimetrists, is the key source of information on new developments for the medical dosimetrist. Practical and comprehensive in coverage, the journal features original contributions and review articles by medical dosimetrists, oncologists, physicists, and radiation therapy technologists on clinical applications and techniques of external beam, interstitial, intracavitary and intraluminal irradiation in cancer management. Articles dealing primarily with physics will be reviewed by a specially appointed team of experts in the field.
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