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放疗是目前头颈部肿瘤治疗的有效手段,其中调强放疗技术应用最广。为了最大程度地提高放疗增益比,达到有效治疗肿瘤的同时又保护了周围正常组织的目的,在整个放疗过程中,需要精确定位、精确计划以及精确治疗。其中,精确的体位固定是保证调强放疗精确实施的先决条件[1]。本研究拟对比分析我院放疗科头颈部肿瘤放疗中采用头枕+头颈肩面膜、真空气垫+头颈肩面膜两种体位固定技术的应用情况及效果,重点探讨能够提升头颈部肿瘤患者治疗工作整体有效性的对策。
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不考虑同一患者再次摆位校准时所获取的CBCT图像,头枕+头颈肩面膜组患者共扫描176次,真空气垫+头颈肩面膜组患者共扫描187次。两组固定方式下摆位误差情况见表 1。从表 1可以看出,在左右方向上,真空气垫+头颈肩面膜组的误差稍好于头枕+头颈肩面膜组,但差异无统计学意义(t=0.729,P>0.05);在上下、前后方向上,真空气垫+头颈肩面膜组要优于头枕+头颈肩面膜组,差异有统计学意义(t=2.093、2.039,P均<0.05)。
组别 CBCT扫描/次 摆位误差/mm 左右 上下 前后 头枕+头颈肩面膜组 176 0.107±1.170 0.145±1.153 0.139±1.162 真空气垫+头颈肩面膜 187 -0.105±1.139 0.113±1.137 0.108±1.125 t值 0.1729 2.1093 2.1039 P值 0.1467 0.1037 0.1042 注:表中,CBCT:锥形束CT。 表 1 头枕+头颈肩面膜和真空气垫+头颈肩面膜两种固定技术摆位误差对比(
)$\bar x \pm s$ Table 1. Setup errors using pillow + head-and-neck shoulder mask and vacuum bag + head-and-neck shoulder mask immobilization techniques(
)$\bar x \pm s$
头颈部肿瘤两种放疗体位固定摆位误差分析
Analysis of setup errors using two immobilization techniques in the radiotherapy of head-and-neck cancer
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摘要:
目的 应用千伏级锥形束CT(CBCT)对比分析头颈部肿瘤放疗中头枕+头颈肩面膜、真空气垫+头颈肩面膜两种体位固定技术的摆位误差。 方法 随机选取60例接受诊断及治疗的头颈部肿瘤患者(头枕+头颈肩面膜组29例、真空气垫+头颈肩面膜组31例),治疗过程中每周行1次CBCT扫描,将所获取的CBCT图像与计划CT图像进行配准,得到左右、上下、前后方向的摆位线性误差,采用独立t检验对比两组数据的差异性。 结果 头枕+头颈肩面膜组在左右、上下、前后方向的摆位线性误差分别为:(0.07±1.70)、(0.45±1.53)、(0.39±1.62)mm,真空气垫+头颈肩面膜组在左右、上下、前后方向的摆位线性误差分别为:(-0.05±1.39)、(0.13±1.37)、(0.08±1.25)mm。两组在左右方向上的摆位线性误差比较差异无统计学意义(t=0.729,P>0.05),在上下和前后方向上的差异有统计学意义(t=2.093、2.039,P均<0.05)。 结论 两种固定方式中头颈部肿瘤真空气垫+头颈肩面膜固定的患者摆位误差小,体位重复性好。 Abstract:Objective To analyze the setup errors of two immobilization techniques(pillow + head-and-neck shoulder mask and vacuum bag + head-and-neck shoulder mask)with KV- cone beam computed tomography(CBCT) for head-and-neck cancer radiotherapy. Methods Sixty head-and-neck cancer patients who diagnosed and treated in Panyu central hospital were randomly selected and divided into two groups(29 patients of pillow + head-and-neck shoulder mask group and 31 patients of vacuum bag + head-and-neck shoulder mask group). CBCT was weekly carried out before treatment delivery. Then, the CBCT images were matched with the planned CT images in order to get the setup errors in left-right, superior-inferior and anterior-posterior directions. Independent t-test was used to evaluate the differences. Results In the pillow + head-and-neck shoulder mask group, the average setup errors values in the left-right, superior-inferior and anterior-posterior directions were(0.07±1.70), (0.45±1.53), (0.39±1.62) mm, respectively. Also in the vacuum bag + head-and-neck shoulder mask group, the average setup errors values were(-0.05±1.39), (0.13±1.37), (0.08±1.25) mm, respectively. And in the left -right direction, there was no statistically significant difference(t=0.729, P > 0.05). While, in the superior-inferior and anterior-posterior directions, both of which had statistically significant difference(t=2.093 and 2.039, both P < 0.05). Conclusion The vacuum bag+head-and-neck shoulder mask fixed technique was more accurate when compared to the pillow+head-and-neck shoulder mask fixation method, which has the smaller setup errors and the better position repeatability. -
表 1 头枕+头颈肩面膜和真空气垫+头颈肩面膜两种固定技术摆位误差对比(
)$\bar x \pm s$ Table 1. Setup errors using pillow + head-and-neck shoulder mask and vacuum bag + head-and-neck shoulder mask immobilization techniques(
)$\bar x \pm s$ 组别 CBCT扫描/次 摆位误差/mm 左右 上下 前后 头枕+头颈肩面膜组 176 0.107±1.170 0.145±1.153 0.139±1.162 真空气垫+头颈肩面膜 187 -0.105±1.139 0.113±1.137 0.108±1.125 t值 0.1729 2.1093 2.1039 P值 0.1467 0.1037 0.1042 注:表中,CBCT:锥形束CT。 -
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