Accuracy of a wireless localization system for radiotherapy

被引:219
作者
Balter, JM
Wright, JN
Newell, LJ
Friemel, B
Dimmer, S
Cheng, Y
Wong, J
Vertatschitsch, E
Mate, TP
机构
[1] Univ Michigan, Hlth Syst, Dept Radiat Oncol, Ann Arbor, MI 48109 USA
[2] Calypso Med Technol, Seattle, WA USA
[3] William Beaumont Hosp, Royal Oak, MI 48072 USA
[4] Swedish Med Ctr, Seattle, WA USA
来源
INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS | 2005年 / 61卷 / 03期
关键词
electromagnetic localization; target localization; tracking;
D O I
10.1016/j.ijrobp.2004.11.009
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
Purpose: A system has been developed for patient positioning based on real-time localization of implanted electromagnetic transponders (beacons). This study demonstrated the accuracy of the system before clinical trials. Methods and Materials: We describe the overall system. The localization component consists of beacons and a source array. A rigid phantom was constructed to place the beacons at known offsets from a localization array. Tests were performed at distances of 80 and 270 mm from the array and at positions in the array plane of up to 8 cm offset. Tests were performed in air and saline to assess the effect of tissue conductivity and with multiple transponders to evaluate crosstalk. Tracking was tested using a dynamic phantom creating a circular path at varying speeds. Results: Submillimeter accuracy was maintained throughout all experiments. Precision was greater proximal to the source plane (sigmax = 0.006 mm, sigmay = 0.01 mm, sigmaz = 0.006 mm), but continued to be submillimeter at the end of the designed tracking range at 270 mm from the array (sigmax = 0.27 mm, sigmay = 0.36 mm, sigmaz = 0.48 mm). The introduction of saline and the use of multiple beacons did not affect accuracy. Submillimeter accuracy was maintained using the dynamic phantom at speeds of up to 3 cm/s. Conclusion: This system has demonstrated the accuracy needed for localization and monitoring of position during treatment. (C) 2005 Elsevier Inc.
引用
收藏
页码:933 / 937
页数:5
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