不同管电压下胸部数字X线摄影影像效果与其对患者影响的对比

Comparison of chest digital X-ray photography with different tube voltages and their influences on patients

目的:为了在数字化摄影中选择合适的射线能量,探讨不同管电压下胸部数字X线摄影影像效果与其对患者的影响。方法:选择成人胸部模体为研究对象,将管电压分别设为80、100及120 k V进行数字X线曝光,测量每种管电压下模体入射剂量、相对噪声值、对比度噪声比及有效剂量。结果:自动曝光控制挡位保持不动时,有效剂量及模体入射剂量均随着管电压的增加而逐渐减小,且模体入射剂量与有效剂量呈正相关性;相对噪声值会随着管电压的增加而逐渐减小,对比度噪声比会随着管电压的增加而逐渐增大。结论:进行胸部数字X线摄影时,在不影响影像质量的前提下,为了降低受检患者所受的辐射剂量应尽量使用较高的管电压。

Objective To select proper radiation energy in digital radiography by exploring the influences of chest digital Xray photography with different tube voltages on the patients. Methods Digital X-ray exposure was carried out with adult chest phantom as the subject, and the tube voltages were set as 80, 100 and 120 k V. The values of the incident doses, relative noises,contrast noises and effective doses were measured with different tube voltages. Results The effective dose and the incident dose both gradually descended with the increase of tube voltage, while the incident dose had positive correlation with the effective dose. The relative noise declined with the increase of the tube voltage, while the contrast was quite the contrary. Conclusion High tube voltage had better be involved in to decrease the radiation dose to the patient during chest digital X-ray photography provided the image quality is ensured.