CAJ | 학술논문

目的：对比常规扫描重建与低kV扫描结合SAFIRE技术重建的图像质量，探讨低kV结合SAFIRE重建的价值。方法：健康成年家犬11只，分别行胸部CT常规剂量及低剂量扫描，规定120 kV／65 mA结合FBP重建为常规组，100 kV／65 mA结合SAFIRE（强度3级）重建为低kV组。比较两种方案的辐射剂量，比较所得两组图像的平均CT值、噪声、SNR、CNR及图像质量评分。结果：与常规组比较，低kV组ED降低了39．33％；同种组织平均CT值比较差异无统计学意义（P＞0．05）；低kV组肺组织、上腔静脉、脊柱旁肌肉噪声均降低，SNR均有升高，上腔静脉－脂肪CNR升高，且差异均有统计学意义（P＜0．05）。图像质量评分低kV组较常规组升高约1．70％。结论：家犬胸部低kV扫描联合SAFIRE重建技术可降低辐射剂量并提高图像质量，可指导临床推广运用。
목적：대비상규소묘중건여저kV소묘결합SAFIRE기술중건적도상질량，탐토저kV결합SAFIRE중건적개치。방법：건강성년가견11지，분별행흉부CT상규제량급저제량소묘，규정120 kV／65 mA결합FBP중건위상규조，100 kV／65 mA결합SAFIRE（강도3급）중건위저kV조。비교량충방안적복사제량，비교소득량조도상적평균CT치、조성、SNR、CNR급도상질량평분。결과：여상규조비교，저kV조ED강저료39．33％；동충조직평균CT치비교차이무통계학의의（P＞0．05）；저kV조폐조직、상강정맥、척주방기육조성균강저，SNR균유승고，상강정맥－지방CNR승고，차차이균유통계학의의（P＜0．05）。도상질량평분저kV조교상규조승고약1．70％。결론：가견흉부저kV소묘연합SAFIRE중건기술가강저복사제량병제고도상질량，가지도림상추엄운용。
Objective To investigate the value of low tube voltage with sinogram affirmed iterative reconstruction (SAFIRE) through comparing the image quality of regular dose scanning with filtered back projection (FBP) reconstruction and low-dose scanning with SAFIRE. Methods Eleven healthy adult domestic dogs were scanned with different doses. The regular dose of 120 kV/65 mA in combination with FBP reconstruction was set as the normal control group, and 100 kV/65 mA plus SAFIRE reconstruction was used as the low kV group. The CT dose index (CTDI), dose length product (DLP), and the effective dose (ED) at different doses were compared, and the average CT value, noise, signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR) and the image quality score of two groups of images were also analyzed. Results ED in the low kV groups was reduced by 39.33%compared to that in the normal control group. No significant differences were found in the average CT value of the same tissue among these two groups (P > 0.05). Compared with the normal control group, image noise of the lung tissue, superior vena cava and spinal muscle of low kV group were consistently decreased, SNR was in also creased, while the noise ratio contrast between superior vena cava and fat was increased. The image quality score of the low kV group was increased by 1.70%compared to that of the normal control group. Conclusion The low kV scan with SAFIRE technology can decrease the radiation dose and improve image quality in chest CT examination of domestic dogs, with a potential value in the clinical promotion and the application.