double contrast radiography of colon

例句：

1. 1. This technique isparticularly effective for detecting small tumors in the early stages of cancer.
   这种技术在早期癌症的小肿瘤检测中特别有效。
2. 2.The double contrast radiography was used to examine the patient's heart function before and after the surgery.
   使用双重对比放射摄影术来检查患者在手术前后的心脏功能。
3. 3. The double contrast radiography helped doctors to better understand the patient's condition and make more accurate diagnoses.
   双重对比放射摄影术帮助医生更好地了解患者的病情，做出更准确的诊断。