北京生物醫(yī)學(xué)工程

改良型CT模擬機(jī)定位精度分析

Analysis of positioning accuracy for improved CT simulator

作者：陳定科黃燦輝董勇梁耀文陳偉洪

單位：           東莞市石龍人民醫(yī)院腫瘤科(廣東東莞523326)    

關(guān)鍵詞：放射治療；CT模擬機(jī)；定位

分類號：

出版年·卷·期（頁碼）：2013·32·4（418-420）

摘要：

目的研究改良型CT模擬機(jī)的定位精度，探討其是否滿足精確放射治療的要求。方法在頭頸部固體模體內(nèi)逐一隨機(jī)預(yù)埋一直徑為3cm金屬圓球10次，將此金屬圓球假設(shè)為靶區(qū)，然后分別用改良型CT模擬機(jī)定位并在直線加速器下復(fù)位，依次得出X（左右方向）、Y（前后方向）、Z（頭腳方向）方向的10次定位誤差。結(jié)果 10次定位誤差在X、Y、Z方向的誤差分別為（0.13±0.23）mm、（0.26±0.36）mm和（0.45±0.43）mm。結(jié)論改良型CT模擬機(jī)定位精度滿足精確放射治療小于3mm的定位精度需要。

Objective To study the positioning accuracy of improved CT simulator and to investigate whether it reaches the precision requirement of radiation therapy. Methods A metal ball of 3cm diameter was embedded in the solid phantoms of head and neck 10 times at random. Assuming the metal ball was the target area，we obtained 10 positioning errors in X-axis (left to right)，Y-axis (front to back) and Z-axis (head to foot) in turn when improved CT simulator was applied for positioning and linear accelerator was applied for resetting. Results The means and standard errors of the 10 positioning errors in X-axis，Y-axis，Z-axis，were (0.13±0.23) mm，(0.26±0.36) mm，(0.45±0.43) mm，respectively. Conclusions The positioning precision of the improved CT simulator reaches the precision requirement of radiation therapy —within 3mm.

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