基于原始数据的迭代重建技术在鼻部外伤CT扫描中的应用  

Application of reconstruction technique in the CT scan of nasal traumas

作　　者：曾宪春[1] 杨艳[1] 韩丹[2] 王谦[1] 康绍磊 

机构地区：[1]贵州省人民医院放射科,贵阳550002 [2]昆明医科大学第一附属医院医学影像科,昆明650032

出　　处：《重庆医学》2015年第28期3956-3958,共3页Chongqing medicine

摘　　要：目的 探讨基于原始数据的迭代重建（SAFIRE）技术在鼻部外伤性病变中的应用价值。方法 鼻部外伤67例行CT平扫,分别用FBP和SAFIRE（强度1-5级）重建,对6种重建图像平均CT值、噪声、信号噪声比（SNR）、对比噪声比（CNR）、主观评分及病变检出情况对比分析。结果 与FBP重建相比,SAFIRE（1-5级）重建后,噪声分别降低20.4%、31.4%、39.7%、46.5%、57.2%;SNR分别提高33.3%、54.7%、75.4%、87.4%、101.4%;CNR分别提高23.0%、36.4%、57.7%、87.4%、106.5%,差异有统计学意义（P〈0.05）。图像主观评分SAFIRE-1和SAFIRE-5图像评分低于FBP,SAFIRE2-4高于FBP重建,SAFIRE-3评分最高,但6种重建图像的病变检出率一致。结论 CT平扫结合SAFIRE重建技术在外伤性鼻部扫描中能有效降低图像噪声及提高图像质量,具有潜在降低扫描剂量的作用。Objective To evaluate the value of the SAFIRE reconstruction technique for the nasal traumatic lesions.Methods Sixty-seven patients with nasal traumas were scanned by the orbital scan and were reconstructed with FBP and SAFIRE（strength grade 1to 5）respectively.Then a comparative analysis for six kinds of reconstructed images were conducted on the average CT value,noise,signal to noise ratio（SNR）,contrast to noise ratio（CNR）,subjective scoring and lesion detection.Results Compared with reconstruction by FBP,SAFIRE（strength grade 1to 5）reconstruction,for the noise,decreased to 20.4%,31.4%,39.7%,46.5%and 57.2%respectively;For the SNR,increased to 33.3%,54.7%,75.4%,87.4% and 101.4% respectively;For the CNR,it also increased to 23.0%,36.4%,57.7%,87.4% and 106.5%respectively;The difference was statistically significant（P〈0.05）.For the images of SAFIRE-1and SAFIRE-5,the image subjective scoring was lower than that by FBP;for the images of SAFIRE-2and SAFIRE-4,the image subjective scoring was higher than that by FBP;and SAFIRE-3had the highest score.But for the rate of lesion detection,all the images were the same.Conclusion CT scan combined SAFIRE reconstruction technique can decrease effectively the noise and increase the image quality in the traumatic nasal scan,as well as has a potential effect to decrease the scan dose.

关 键 词：鼻 外伤 体层摄影术 X线计算机 迭代重建 滤波反投影重建 

分 类 号：R765.8[医药卫生—耳鼻咽喉科]