摘要
对比分析61例食管癌X片和CT图,研究其外侵范围和规律,并对不同照射方法作了等剂量图,探讨以X片预测照射野大小。结果显示以食管为中心定位,前野宽6cm,二后斜野宽5cm,长15cm的照射野,90％等剂量区狭小,近50％患者的肿瘤可因外侵而未完全包括在90％等剂量区。对上,中胸段食管癌,长度<5cm而无外侵时,同中心照射,前野8cm,二后斜野6cm,50°,或前野7cm,二后斜野6cm,非同中心照射,可使100％患者原发灶在90％等剂量区内。长度>5cm或有外侵时,同中心照射前野8cm,二后斜野7cm,或非同中心照射,前野8cm,二后斜野6cm,可使90％患者的原发灶在90％等剂量区内。
Retrospective analysis by isodose curves supplemented by X-ray film and CT of 61 pa- tients with esophageal carcinoma treated by the conventional 3-field technique (one anterior 6 x 15, two posterior 5×15) was done. It was found that about 50% of the tumor invasion was not covered in the 90% target area. Accordingly, the authors suggest that: 1. when the tumor is in the thoracic inlet, in the midthoracic segment or ≤5 cm, without any evidence of extra-esophageal invasion, one anterior field 8×15, two posterior oblique fields 6×15 for iso-center irradiation, or one anterior 7×15, two posterior oblique 6×15 for non-isocenter irradiation should be used in 60Co or 18MV X-ray, and 2. when the primary lesion is longer than 5 cm or with any evidence of extra-esophageal invasion, one anterior 8×15, two posterior 6×15 for non-isocenter irradiation or one anterior 8×15 cm, two posterior 7×15 cm for iso-center irradiation should be used.
出处
《中华放射肿瘤学杂志》
CSCD
1992年第4期20-23,71-72,共6页
Chinese Journal of Radiation Oncology
