本次研究在於近年來放射治療技術的演進大量使用IMRT或是VAMT等技術治療頭頸部癌症並且作為預防性治療同步治療上鎖骨淋巴結區，探討在同步治療淋巴結區時肩部固定效果。收集18位頭頸部病患使用CBCT分別收集三組使用不同固定模式固定肩部，在收集673組影像後分別分析左、右肩膀各三組使用不同固定模式的固定性，左肩膀畫線模式左右、頭腳、前後方向平均值分別與標準差為0.51±0.9 cm、0.43±0.36 cm、0.38±0.34 cm，第二種舊式SR(Shoulder retractor) 0.38±0.26 cm、0.33±0.19 cm、0.26±0.23 cm，第三種新式SR 0.25±0.18 cm、 0.18±0.19 cm、0.23±0.21 cm，右肩膀畫線模式左右、頭腳、前後方向平均值分別與標準差為0.57±0.59 cm、0.46±0.38 cm、0.31±0.24 cm，第二種舊式SR 0.31±0.26 cm、0.3±0.21 cm、0.26±0.21 cm，第三種新式SR0.28±0.27 cm、0.16±0.14 cm、0.32±0.91 cm。以統計數據來看在左、右肩在左右、頭腳方向固定性方面不論是使用舊式SR或是新式SR固定效果皆比使用畫線模式來好(P 值<0.001)，而新舊SR相比新式SR只有比舊式SR頭腳方向固定性來的好(P 值 <0.001)左右方向與前後方向左右肩無明顯差異，從結果得知毫無使用固定模具單純只用畫線來擺定病患的肩部位置是最不理想的方式。

The recent evolution of radiation therapy often using technologies such as IMRT or VAMT treatment of head and neck cancer and resynchronization therapy as a preventive treatment and supraclavicular lymph node, investigate the treatment of lymph node synchronization when the shoulder fixed effects. Collection of 18 patients with head and neck cancer were collected using CBCT three groups using different immobilization fixed shoulder, collecting 673 images were analyzed left and right shoulder three groups using different modes of fixity immobilization, the left shoulder, left-right (LR)、craniocaudal (CC) and anteroposterior (AP) directions, respectively, with the standard deviation of the mean 0.51± 0.9 cm, 0.43±0.36 cm,0.38±0.34 cm, second the old-SR (Shoulder retractor) 0.38±0.26 cm, 0.33±0.19 cm, 0.26±0.23 cm, the third new-SR 0.25±0.18 cm, 0.18±0.19 cm, 0.23±0.21 cm, the right shoulder 0.57±0.59 cm, 0.46±0.38 cm, 0.31±0.24 cm, second the old-SR 0.31±0.26 cm, 0.30.21 cm, 0.26±0.21 cm, the third new-SR0.28±0.27 cm, 0.16±0.14 cm 0.32± 0.91 cm. Statistical data on the left and right shoulder, whether used on LR、CC direction fixity of old-SR or new-SR fixed effects are to be better than using the line drawing mode (P<0.001), The old-SR compared to the new SR only CC direction than the old-SR fixity good (P<0.001) LR and AP direction left and right shoulder was no significant difference, from the result that there is no immobilization simply draw a line using only the patient's shoulder to put a given location is not the most ideal way.