CAJ | 학술논문

目的：对低剂量扫描肾动脉CTA检查原始数据分别运用自适应迭代重建技术(AIDR)和滤波反投影法(FBP)两种方法获得的图像进行比较，探讨AIDR的图像质量优势及临床应用价值。方法对20例采用640层动态容积CT进行肾动脉CTA检查的患者原始图像数据，在工作站上分别使用AIDR和FBP两种方法进行图像重建，测量腹主动脉、肾动脉、竖脊肌CT值、背景SD并计算SNR及CNR值，对重建图像进行主、客观评分并进行图像质量的比较。结果主观评价比较中，AIDR组图像质量整体评分及血管锐利度评分高于FBP组(P＜0.01)，两组图像MRP、VR和MIP血管分支显示方面均无显著统计学差异(P＞0.05)。客观评价指标比较中，两组腹主动脉、肾动脉、竖脊肌及空气CT值分均无统计学差异(P＞0.05)，AIDR组SNR、CNR较FBP组增高(P＜0.05)而噪声减低(P＜0.05)。结论相对于FBP重建方法，AIDR在相同扫描条件下可以提高肾动脉CTA图像质量、降低图像噪声。
목적：대저제량소묘신동맥CTA검사원시수거분별운용자괄응질대중건기술(AIDR)화려파반투영법(FBP)량충방법획득적도상진행비교，탐토AIDR적도상질량우세급림상응용개치。방법대20례채용640층동태용적CT진행신동맥CTA검사적환자원시도상수거，재공작참상분별사용AIDR화FBP량충방법진행도상중건，측량복주동맥、신동맥、수척기CT치、배경SD병계산SNR급CNR치，대중건도상진행주、객관평분병진행도상질량적비교。결과주관평개비교중，AIDR조도상질량정체평분급혈관예리도평분고우FBP조(P＜0.01)，량조도상MRP、VR화MIP혈관분지현시방면균무현저통계학차이(P＞0.05)。객관평개지표비교중，량조복주동맥、신동맥、수척기급공기CT치분균무통계학차이(P＞0.05)，AIDR조SNR、CNR교FBP조증고(P＜0.05)이조성감저(P＜0.05)。결론상대우FBP중건방법，AIDR재상동소묘조건하가이제고신동맥CTA도상질량、강저도상조성。
Objective To compare the image qualities of low tube voltage renal artery computed tomography angiography (CTA) using adaptive iterative dose reduction (AIDR) and filter back projection (FBP) algorithm, and evaluate the clinical application value of AIDR.Mehtods Twenty consecutive patients underwent renal artery CTA. The collected raw data were reconstructed by ADIR and FBP algorithm respectively. CT and background SD value of abdominal arota, renal artery and erector muscle of spine were measured, the SNR and CNR were calculated, and the image quality were compared with subjective grading.Results In subjective evaluation of the image quality as a whole and blood vessel sharpness, the AIDR group was higher than that in FBP group. There were no significant differences in the vessel branches displayed on MRP, VR and MIP. For objective evaluation, there were no significant differences of the CT value of abdominal arota, renal artery and erector muscle of spine between two groups. The SNR and CNR in AIDR group were higher than that in FBP group, the SD values were lower than that in FBP group.Conclusion The image quality of AIDR group was better than that of FBP. AIDR could reduce the imaging noise, improve the image quality and has the potential of radiation reduction.