单源腹部 CT 中分体滤波双能图像与单能图像的图像质量和辐射剂量比较。
Comparison of image quality and radiation dose between split-filter dual-energy images and single-energy images in single-source abdominal CT.
机构信息
Clinic of Radiology and Nuclear Medicine, University Hospital Basel, University of Basel, Petersgraben 4, CH-4031, Basel, Switzerland.
Department of Radiology, Duke University Medical Center, Durham, NC, USA.
出版信息
Eur Radiol. 2018 Aug;28(8):3405-3412. doi: 10.1007/s00330-018-5338-x. Epub 2018 Feb 19.
OBJECTIVES
To compare image quality and radiation dose of abdominal split-filter dual-energy CT (SF-DECT) combined with monoenergetic imaging to single-energy CT (SECT) with automatic tube voltage selection (ATVS).
METHODS
Two-hundred single-source abdominal CT scans were performed as SECT with ATVS (n = 100) and SF-DECT (n = 100). SF-DECT scans were reconstructed and subdivided into composed images (SF-CI) and monoenergetic images at 55 keV (SF-MI). Objective and subjective image quality were compared among single-energy images (SEI), SF-CI and SF-MI. CNR and FOM were separately calculated for the liver (e.g. CNR) and the portal vein (CNR). Radiation dose was compared using size-specific dose estimate (SSDE). Results of the three groups were compared using non-parametric tests.
RESULTS
Image noise of SF-CI was 18% lower compared to SEI and 48% lower compared to SF-MI (p < 0.001). Composed images yielded higher CNR over single-energy images (23.4 vs. 20.9; p < 0.001), whereas CNR was significantly lower (3.5 vs. 5.2; p < 0.001). Monoenergetic images overcame this inferiority in CNR and achieved similar results compared to single-energy images (5.1 vs. 5.2; p > 0.628). Subjective sharpness was equal between single-energy and monoenergetic images and diagnostic confidence was equal between single-energy and composed images. FOM was highest for SF-CI. FOM was equal for SEI and SF-MI (p = 0.78). SSDE was significant lower for SF-DECT compared to SECT (p < 0.022).
CONCLUSIONS
The combined use of split-filter dual-energy CT images provides comparable objective and subjective image quality at lower radiation dose compared to single-energy CT with ATVS.
KEY POINTS
• Split-filter dual-energy results in 18% lower noise compared to single-energy with ATVS. • Split-filter dual-energy results in 11% lower SSDE compared to single-energy with ATVS. • Spectral shaping of split-filter dual-energy leads to an increased dose-efficiency.
目的
比较腹部分割滤波双能 CT（SF-DECT）结合单能量成像与自动管电压选择（ATVS）的单能量 CT（SECT）的图像质量和辐射剂量。
方法
对 200 例单源腹部 CT 扫描进行 SECT 检查，采用自动管电压选择（n = 100）和 SF-DECT（n = 100）。SF-DECT 扫描重建并分为组合图像（SF-CI）和 55keV 单能量图像（SF-MI）。比较单能量图像（SEI）、SF-CI 和 SF-MI 的客观和主观图像质量。分别计算肝脏（如 CNR）和门静脉（CNR）的 CNR 和 FOM。使用体积特异性剂量估计（SSDE）比较辐射剂量。使用非参数检验比较三组结果。
结果
SF-CI 的图像噪声比 SEI 低 18%，比 SF-MI 低 48%（p < 0.001）。组合图像的 CNR 高于单能量图像（23.4 比 20.9；p < 0.001），而 CNR 明显较低（3.5 比 5.2；p < 0.001）。单能量图像克服了这一 CNR 劣势，与单能量图像的结果相似（5.1 比 5.2；p > 0.628）。单能量和单能量图像的主观锐度相等，单能量和组合图像的诊断信心相等。SF-CI 的 FOM 最高。SEI 和 SF-MI 的 FOM 相等（p = 0.78）。SF-DECT 的 SSDE 明显低于 SECT（p < 0.022）。
结论
与自动管电压选择的单能量 CT 相比，联合使用分割滤波双能 CT 图像可在降低辐射剂量的情况下提供相当的客观和主观图像质量。
重点
• 与自动管电压选择的单能量 CT 相比，分割滤波双能的噪声降低 18%。• 与自动管电压选择的单能量 CT 相比，分割滤波双能的 SSDE 降低 11%。• 分割滤波双能的光谱成形可提高剂量效率。
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