CAJ | 학술논문

目的：对行冠状动脉CTA检查的患者原始数据应用低剂量自适应迭代重建技术（AIDR ）与滤过反投影法（FBP ）两种方法的图像进行比较，旨在了解迭代重建算法的图像质量及其临床应用价值。方法：26例临床疑似稳定性心绞痛患者采用320排CT行冠状动脉CTA检查。利用AIDR 重建的常规X线剂量方案扫描，对采集得到的原始数据分别用AIDR和FBP两种方法进行图像重建。测量升主动脉开口、右冠状动脉近段、左冠状动脉主干、右冠状动脉中段、左前降支近段及左回旋支近段的CT值、背景SD并计算分析SNR、CNR值。比较两者的图像质量。结果：26例患者都在一次心动周期完成冠状动脉检查。在血管各节段测得的平均CT值差异无统计学意义（P＞0．05），背景SD值的差异有统计学意义（P＜0．001），计算得到的SNR、CNR差异有统计学意义（P＜0．001）。两组图像质量的主观评分差异有统计学意义，AIDR （3．73±0．49）、FBP（3．59±0．61）（P＜0．01）。结论：应用AIDR重建法的图像质量优于FBP 重建法，迭代重建技术可明显降低图像噪声，改善影像质量并具有降低辐射剂量的作用。
목적：대행관상동맥CTA검사적환자원시수거응용저제량자괄응질대중건기술（AIDR ）여려과반투영법（FBP ）량충방법적도상진행비교，지재료해질대중건산법적도상질량급기림상응용개치。방법：26례림상의사은정성심교통환자채용320배CT행관상동맥CTA검사。이용AIDR 중건적상규X선제량방안소묘，대채집득도적원시수거분별용AIDR화FBP량충방법진행도상중건。측량승주동맥개구、우관상동맥근단、좌관상동맥주간、우관상동맥중단、좌전강지근단급좌회선지근단적CT치、배경SD병계산분석SNR、CNR치。비교량자적도상질량。결과：26례환자도재일차심동주기완성관상동맥검사。재혈관각절단측득적평균CT치차이무통계학의의（P＞0．05），배경SD치적차이유통계학의의（P＜0．001），계산득도적SNR、CNR차이유통계학의의（P＜0．001）。량조도상질량적주관평분차이유통계학의의，AIDR （3．73±0．49）、FBP（3．59±0．61）（P＜0．01）。결론：응용AIDR중건법적도상질량우우FBP 중건법，질대중건기술가명현강저도상조성，개선영상질량병구유강저복사제량적작용。
Objective:To compare the image qualities of coronary computed tomography angiography (CCTA)using adaptive iterative dose reduction (AIDR)and filtered back projection (FBP)algorithm and to evaluate the clinical value of AIDR.Methods:Twenty-six patients with suspected stable angina underwent regular radiation dose scanning protocol on 320 MDCT scanner.The collected raw data were then reconstructed with AIDR and FBP respectively.CT value and back-ground SD value were measured at the aorta root,proximal and middle right coronary artery,left main coronary artery,prox-imal left anterior artery,as well as proximal left circumflex artery.SNR and CNR were also calculated.Two observers com-pared the quality of the images with subjective grading.Results:Twenty-six patients completed CCTA within one heart beat.The average CT attenuation measured at segments of coronary arteries was not statistically different (P>0.05).Back-ground SD value,SNR and CNR calculated were statistically different (P<0.001).The subjective grading of image qualities between two groups were 3.73±0.49 for AIDR and 3.59±0.61for FBP,respectively,and was statistically different (P<0.01).Conclusion:The quality of images reconstructed with AIDR was better than that of FBP.AIDR can reduce the ima-ging noise significantly,improve the image quality and help reducing radiation dose potentially.