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首页> 外文期刊>Radiotherapy and oncology: Journal of the European Society for Therapeutic Radiology and Oncology >Evaluation of set-up deviations during the irradiation of patients suffering from breast cancer treated with two different techniques.
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Evaluation of set-up deviations during the irradiation of patients suffering from breast cancer treated with two different techniques.

机译：两种不同技术治疗的乳腺癌患者在照射过程中的安装偏差评估。

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PURPOSE: To compare reproducibility of set-up for two different treatment techniques for external irradiation of the breast. METHODS AND MATERIALS: In total, the analysis comprised 56 pairs of portal and simulator films for 14 consecutive patients treated following breast conserving therapy and 98 pairs of portal and simulator films for 20 consecutive patients treated after mastectomy. For the first group the tangential field technique (TF technique) was used, for the second the inverse hockey stick technique (IHS technique). Evaluation of the treatment reproducibility was performed in terms of systematic and random error calculated for the whole groups, comparison of set-up accuracy by means of comparison of cumulative distribution of the length of the displacement vector. RESULTS: In the IHS and TF techniques for medial and lateral fields, displacement larger than 5 mm occurred in 28.3, 15.8 and 25.4%, respectively. For the IHS technique, the systematic errors for lateral and cranial-caudal directionwere 1.9 and 1.7 mm, respectively (1 SD), the random errors for lateral and cranial-caudal direction were 2.0 and 2.5 mm. For the TF technique, the systematic errors for ventral-dorsal and cranial-caudal direction were 2.6 and 1.3 mm for medial field and 3.7 and 0.7 mm for lateral fields, respectively, the random errors for lateral and cranial-caudal direction were 2.2 and 1.0 mm for medial field and 2.9 and 1.1 for lateral field, respectively. Rotations were negligible in the IHS technique. For the TF technique the systematic and random components amounted to about 2.0 degrees (1 SD). CONCLUSIONS: Both the inverse hockey stick and standard tangential techniques showed good reproducibility of patients' set-up with respect to cranial-caudal direction. For the TF technique, the accuracy should be improved for the medial field with respect to the ventral-dorsal direction.
机译：目的：比较两种外部乳房放射治疗方法的可重复性。方法和材料：总体上，该分析包括针对14例接受保乳治疗的连续患者的56对门和模拟器膜，以及针对20例接受乳房切除术的连续患者的98对门和模拟器膜。第一组使用切线场技术（TF技术），第二组使用反曲棍球棒技术（IHS技术）。根据为整个组计算的系统误差和随机误差，通过比较位移向量长度的累积分布，比较设置准确性，对治疗的可重复性进行评估。结果：在IHS和TF技术的内侧和外侧视野中，大于5 mm的位移分别发生在28.3％，15.8％和25.4％。对于IHS技术，横向和颅尾方向的系统误差分别为1.9和1.7 mm（1 SD），横向和颅尾方向的系统误差分别为2.0和2.5 mm。对于TF技术，内侧视野的腹背和颅尾方向的系统误差分别为2.6和1.3 mm，外侧视野的系统误差分别为2.2和1.0，而3.7和0.7 mm。内侧磁场为mm，外侧磁场为2.9和1.1。在IHS技术中，旋转可以忽略不计。对于TF技术，系统和随机分量总计约为2.0度（1 SD）。结论：反向曲棍球棒和标准切线技术在颅尾方向上均显示出患者设置的良好再现性。对于TF技术，应提高相对于腹背方向的内侧视野的准确性。

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