COMPARISON BETWEEN INFRARED OPTICAL AND STEREOSCOPIC X-RAY TECHNOLOGIES FOR PATIENT SETUP IN IMAGE GUIDED STEREOTACTIC RADIOTHERAPY

被引:10
作者
Tagaste, Barbara [1 ,2 ]
Riboldi, Marco [2 ,3 ]
Spadea, Maria F. [3 ,4 ]
Bellante, Simone [3 ]
Baroni, Guido [2 ,3 ]
Cambria, Raffaella
Garibaldi, Cristina
Ciocca, Mario [2 ]
Catalano, Gianpiero [1 ,6 ]
Alterio, Daniela [1 ]
Orecchia, Roberto [1 ,2 ,5 ]
机构
[1] European Inst Oncol, Div Radiat Oncol, Milan, Italy
[2] Ctr Nazl Adroterapia Oncol, Pavia, Italy
[3] Politecn Milano Univ, Dept Bioengn, TBM Lab, Milan, Italy
[4] Magna Graecia Univ Catanzaro, Dept Expt & Clin Med, Catanzaro, Italy
[5] Univ Milan, Dept Sci & Biomed Technol, Milan, Italy
[6] Multimed Holding Clin Inst, Unit Radiotherapy, Castellanza, Italy
来源
INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS | 2012年 / 82卷 / 05期
关键词
Patient setup; Image-guided radiotherapy; Stereotactic irradiation; CONE-BEAM CT; RADIATION-THERAPY; DEFORMABLE REGISTRATION; BODY RADIOTHERAPY; SYSTEM; MOTION; LOCALIZATION; IRRADIATION; MANAGEMENT; ACCURACY;
D O I
10.1016/j.ijrobp.2011.04.004
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
Purpose: To compare infrared (IR) optical vs. stereoscopic X-ray technologies for patient setup in image-guided stereotactic radiotherapy. Methods and Materials: Retrospective data analysis of 233 fractions in 127 patients treated with hypofractionated stereotactic radiotherapy was performed. Patient setup at the linear accelerator was carried out by means of combined IR optical localization and stereoscopic X-ray image fusion in 6 degrees of freedom (6D). Data were analyzed to evaluate the geometric and dosimetric discrepancy between the two patient setup strategies. Results: Differences between IR optical localization and 6D X-ray image fusion parameters were on average within the expected localization accuracy, as limited by CT image resolution (3 mm). A disagreement between the two systems below 1 mm in all directions was measured in patients treated for cranial tumors. In extracranial sites, larger discrepancies and higher variability were observed as a function of the initial patient alignment. The compensation of IR-detected rotational errors resulted in a significantly improved agreement with 6D X-ray image fusion. On the basis of the bony anatomy registrations, the measured differences were found not to be sensitive to patient breathing. The related dosimetric analysis showed that IR-based patient setup caused limited variations in three cases, with 7% maximum dose reduction in the clinical target volume and no dose increase in organs at risk. Conclusions: In conclusion, patient setup driven by IR external surrogates localization in 6D featured comparable accuracy with respect to procedures based on stereoscopic X-ray imaging. (C) 2012 Elsevier Inc.
引用
收藏
页码:1706 / 1714
页数:9
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