Department of Radiology, Emory University School of Medicine, Atlanta, GA 30322, USA.
Acad Radiol. 2011 Feb;18(2):205-11. doi: 10.1016/j.acra.2010.09.014. Epub 2010 Nov 13.
To evaluate the performance of a patient size-compensated automatic tube current modulation (PSC-AutomA) technique from the perspectives of image quality and radiation dose in multi-detector-row computed tomography (MDCT) scan of the abdomen and pelvis.
Institutional review board approval was obtained and the study was Health Insurance Portability and Accountability Act-compliant. One hundred and seventeen patients (mean age: 48.8 years; range: 17-89 years; male/female: 57/60) underwent abdominal-pelvic CT scan on a 64-slice MDCT using the noise indexes (NI) recommended by the PSC-AutomA technique. Two radiologists independently evaluated all examinations for noise, streak artifacts, and diagnostic acceptability at the dome of liver, porta hepatis, and the upper margin of acetabulum. The CT dose index (CTDI) volume and effective dose of the CT performed using a recommended NI were compared to the CT performed using a fixed NI of 12. Statistical analysis of the data was performed with nonparametric tests.
The NI recommended by the PSC-AutomA technique was strongly correlated with patient size (r = 0.98, P < .001) with a mean NI of 14.2 HU. The recommended NI of 98.2% (115/117) patients was different from the fixed NI of 12. Approximately 71.8% (84/117) subjects were scanned with a NI higher than 12, whereas 26.5% (31/117) subjects were scanned with a NI lower than 12. All examinations (100%; 117/117) were graded as possessing diagnostic image quality. Compared with the CT performed by using a fixed NI 12, the overall CTDI and effective dose reduction by the PSC-AutomA technique were 11.1% and 11.8%, respectively.
The PSC-AutomA technique can recommend an appropriate NI in MDCT scan of the abdomen and pelvis according to patient size, allowing a balanced optimization of both radiation dose and image quality, simultaneously.
从图像质量和辐射剂量的角度评估一种基于患者体型的自动管电流调制（PSC-AutomA）技术在多排螺旋 CT（MDCT）腹部和骨盆扫描中的性能。
本研究获得了机构审查委员会的批准，符合《健康保险流通与责任法案》的规定。117 名患者（平均年龄：48.8 岁；范围：17-89 岁；男/女：57/60）在一台 64 层 MDCT 上使用 PSC-AutomA 技术推荐的噪声指数（NI）进行腹部-骨盆 CT 扫描。两位放射科医生独立评估了所有检查结果，评估指标包括肝脏顶部、肝门和髋臼上缘的噪声、条纹伪影和诊断可接受性。比较了使用推荐 NI 和固定 NI（12）进行 CT 扫描时的 CT 剂量指数（CTDI）体积和有效剂量。使用非参数检验对数据进行统计学分析。
PSC-AutomA 技术推荐的 NI 与患者体型呈强相关（r=0.98，P<.001），平均 NI 为 14.2 HU。98.2%（115/117）患者的推荐 NI 与固定 NI（12）不同。约 71.8%（84/117）的患者采用的 NI 高于 12，而 26.5%（31/117）的患者采用的 NI 低于 12。所有检查（100%；117/117）均被评为具有诊断性图像质量。与使用固定 NI（12）进行 CT 扫描相比，PSC-AutomA 技术可使 CTDI 和有效剂量分别降低 11.1%和 11.8%。
PSC-AutomA 技术可根据患者体型推荐适当的 NI，在平衡优化辐射剂量和图像质量方面具有优势。
