中国医学装备
中國醫學裝備
중국의학장비
CHINA MEDICAL EQUIPMENT
2014年
12期
122-123
,共2页
锥形束CT%放射治疗%摆位误差%电子射野影像验证系统
錐形束CT%放射治療%襬位誤差%電子射野影像驗證繫統
추형속CT%방사치료%파위오차%전자사야영상험증계통
Cone-beam CT%Radiation therapy%Setup errors%Electronic portal imaging device
目的：研究锥形束CT(CBCT)图像引导系统在精确放射治疗中提高摆位的精度，减少摆位的不确定性的作用。方法：对头颈部肿瘤患者(30例)和胸部肿瘤患者(40例)用CBCT扫描，其中头颈部肿瘤患者扫描90次，胸部肿瘤患者扫描113次，统计患者前后、头脚及左右方向的摆位偏差。结果：对于头颈部肿瘤患者前后方向的最大偏差值为6 mm，3个方向中＞3 mm偏差的均在10%以下；对于胸部肿瘤患者的头脚方向摆位误差最大，＞5 mm的达21.51%。前后方向的误差≤5 mm，左右方向＞5 mm的为4.53%。结论：采用CBCT图像引导系统对患者体位实时修正，极大的提升了放射治疗的精度和疗效。相对于电子射野影像验证系统(EPID)，CBCT对患者的累积剂量的影响更小，图像分辨率更高，图像匹配更精确，但是和普通螺旋CT相比，其分辨率和扫描范围还需要更进一步的提高。
目的：研究錐形束CT(CBCT)圖像引導繫統在精確放射治療中提高襬位的精度，減少襬位的不確定性的作用。方法：對頭頸部腫瘤患者(30例)和胸部腫瘤患者(40例)用CBCT掃描，其中頭頸部腫瘤患者掃描90次，胸部腫瘤患者掃描113次，統計患者前後、頭腳及左右方嚮的襬位偏差。結果：對于頭頸部腫瘤患者前後方嚮的最大偏差值為6 mm，3箇方嚮中＞3 mm偏差的均在10%以下；對于胸部腫瘤患者的頭腳方嚮襬位誤差最大，＞5 mm的達21.51%。前後方嚮的誤差≤5 mm，左右方嚮＞5 mm的為4.53%。結論：採用CBCT圖像引導繫統對患者體位實時脩正，極大的提升瞭放射治療的精度和療效。相對于電子射野影像驗證繫統(EPID)，CBCT對患者的纍積劑量的影響更小，圖像分辨率更高，圖像匹配更精確，但是和普通螺鏇CT相比，其分辨率和掃描範圍還需要更進一步的提高。
목적：연구추형속CT(CBCT)도상인도계통재정학방사치료중제고파위적정도，감소파위적불학정성적작용。방법：대두경부종류환자(30례)화흉부종류환자(40례)용CBCT소묘，기중두경부종류환자소묘90차，흉부종류환자소묘113차，통계환자전후、두각급좌우방향적파위편차。결과：대우두경부종류환자전후방향적최대편차치위6 mm，3개방향중＞3 mm편차적균재10%이하；대우흉부종류환자적두각방향파위오차최대，＞5 mm적체21.51%。전후방향적오차≤5 mm，좌우방향＞5 mm적위4.53%。결론：채용CBCT도상인도계통대환자체위실시수정，겁대적제승료방사치료적정도화료효。상대우전자사야영상험증계통(EPID)，CBCT대환자적루적제량적영향경소，도상분변솔경고，도상필배경정학，단시화보통라선CT상비，기분변솔화소묘범위환수요경진일보적제고。
Objective:Study the effect about cone beam CT(CBCT) image guidance sytem to improve the positioning accuracy and reducing the set-up uncertainty in precise radiotherapy. Methods:Use CBCT system to scan head and neck tumors patients (30 cases) and chest tumor patients (40 cases), including head and neck tumor patients were scaned 90 times, chest tumor patients were scaned 113 times. Setup deviation statistics about anterior and posterior, head and feet, left and right direction. Results:The patients with head and neck cancer, the maximum error of anterior-posterior is 6mm, Three directions errors which greater than 3mm all less than 10%. Patients with chest tumor position error are in the head and foot direction, greater than 5 mm up to 21.51%. Before and after the direction of the error did not exceed 5mm. The left and right direction greater than 5 mm up to 4.53%. Conclusion:It greatly enhances the precision of radiotherapy, improved the curative effect of radiotherapy by using CBCT online image guidance system for the patient position correction. Compared with EPID, patients scaned with CBCT absorb smaller cumulative dose, the image resolution is higher, image matching is more accurate. But compared with the ordinary helical CT,the resolution and scanning range also need to improve.
