CAJ | 학술논문

目的：探讨 Flash 双源 CT 低管电压(100 kVp)扫描联合迭代重建(IR)技术在盆腔 CT 扫描中的应用价值。方法疑盆腔内病变行 CT 检查患者88例,体质量指数19 kg/m2<BMI≤25 kg/m2。按随机原则,常规管电压 FBP 组45例采用120 kVp 扫描,FBP 重建；低压 SAFIRE 组43例采用100 kVp 扫描,SAFIRE 重建(强度3级)；其余条件不变。比较2组的辐射剂量及图像的平均 CT 值、图像噪声、信号噪声比(SNR)、对比噪声比(CNR)、图像质量主观评分和诊断效能等。结果2组方案扫描辐射剂量的比较差异有统计学意义(P <0.05),低压 SAFIRE 组较常规管电压组 ED 降低了35.42%；与常规管电压 FBP 组相比,低压 SAFIRE组图像噪声降低17.85%,SNR 提高15.54%,CNR 提高13.47%,且均存在统计学差异(P <0.05)。2组图像的主观评分比较差异无统计学意义(P >0.05)。2组重建图像对病变的诊断效能与临床诊断比较通过χ2检验无统计学意义(P >0.05)。结论在盆腔CT 扫描中运用 Flash 双源 CT 低管电压(100 kVp)联合 SAFIRE 重建技术,能降低辐射剂量并保证图像质量及诊断效能。
목적：탐토 Flash 쌍원 CT 저관전압(100 kVp)소묘연합질대중건(IR)기술재분강 CT 소묘중적응용개치。방법의분강내병변행 CT 검사환자88례,체질량지수19 kg/m2<BMI≤25 kg/m2。안수궤원칙,상규관전압 FBP 조45례채용120 kVp 소묘,FBP 중건；저압 SAFIRE 조43례채용100 kVp 소묘,SAFIRE 중건(강도3급)；기여조건불변。비교2조적복사제량급도상적평균 CT 치、도상조성、신호조성비(SNR)、대비조성비(CNR)、도상질량주관평분화진단효능등。결과2조방안소묘복사제량적비교차이유통계학의의(P <0.05),저압 SAFIRE 조교상규관전압조 ED 강저료35.42%；여상규관전압 FBP 조상비,저압 SAFIRE조도상조성강저17.85%,SNR 제고15.54%,CNR 제고13.47%,차균존재통계학차이(P <0.05)。2조도상적주관평분비교차이무통계학의의(P >0.05)。2조중건도상대병변적진단효능여림상진단비교통과χ2검험무통계학의의(P >0.05)。결론재분강CT 소묘중운용 Flash 쌍원 CT 저관전압(100 kVp)연합 SAFIRE 중건기술,능강저복사제량병보증도상질량급진단효능。
Objective To investigate the value of low kilovoltage (100 kVp)in combination with sinogram affirmed iterative re-construction (SAFIRE)of flash dual source CT in pelvic scan in comparison with routine kilovoltage (120 kVp)and filtered back projection (FBP).Methods 88 patients with suspected pelvic lesions underwent CT scan,and the range of BMI was 1 9 kg/m2 <BMI≤25 kg/m2 .45 patients were scanned with 120 kVp and FBP reconstruction (group 1 ),and other 43 with 100 kVp and SAFIRE reconstruction (selected strength level 3)(group 2).The other scanning parameters in all cases were similar.Mean CT values,image noise,SNR,CNR,subjective scoring and diagnosis efficiency between two groups were compared.Results The differ-ence in radiation dose (ED)between two groups was statistically significant (P <0.05 ),and the ED in group 2 was decreased by 35.42% in comparison with that in group 1.Compared with group 1,the noise in group 2 was decreased by 1 7.85%,however,the SNR and CNR were increased by 1 5.54% and 13.47% respectively,exhibiting statistically significant differences (P <0.05 ).No differences in quality score and lesion detection rate were found.Conclusion The pelvic images using low kilovoltage (100 kVp)and SAFIRE-3 of second-generation dual source CT can meet the diagnostic requirements with significantly reduced radiation dosage.