Korn Andreas, Bender Benjamin, Spira Daniel, Schabel Christoph, Bhadelia Rafeeque, Claussen Claus, Ernemann Ulrike, Brodoefel Harald
Department of Diagnostic und Interventional Neuroradiology, University of Tübingen, Tübingen, Germany.
Department of Diagnostic und Interventional Radiology, Tubingen, Germany.
Acad Radiol. 2014 Dec;21(12):1506-11. doi: 10.1016/j.acra.2014.07.012. Epub 2014 Sep 8.
A new computed tomography (CT) detector with integrated electric components and shorter conducting pathways has recently been introduced to decrease system inherent electronic noise. The purpose of this study was to assess the potential benefit of such integrated circuit detector (ICD) in head CT by comparing objective and subjective image quality in low-dose examinations with a conventional detector design.
Using a conventional detector, reduced-dose noncontrast head CT (255 mAs; effective dose, 1.7 mSv) was performed in 25 consecutive patients. Following transition to ICD, 25 consecutive patients were scanned using identical imaging parameters. Images in both groups were reconstructed with iterative reconstruction (IR) and filtered back projection (FBP) and assessed in terms of quantitative and qualitative image quality.
Acquisition of head CT using ICD increased signal-to-noise ratio of gray and white matter by 14% (10.0 ± 1.6 vs. 11.4 ± 2.5; P = .02) and 17% (8.2 ± 0.8 vs. 9.6 ± 1.5; P = .000). The associated improvement in contrast-to-noise ratio was 12% (2.0 ± 0.5 vs. 2.2 ± 0.6; P = .121). In addition, there was a 51% increase in objective image sharpness (582 ± 85 vs. 884.5 ± 191; change in HU/Pixel; P < .000). Compared to standard acquisitions, subjective grading of noise and overall image quality scores were significantly improved with ICD (2.1 ± 0.3 vs. 1.6 ± 0.3; P < .000; 2.0 ± 0.5 vs. 1.6 ± 0.3; P = .001). Moreover, streak artifacts in the posterior fossa were substantially reduced (2.3 ± 0.7 vs. 1.7 ± 0.5; P = .004).
At the same radiation level, acquisition of head CT with ICD achieves superior objective and subjective image quality and provides potential for significant dose reduction.
最近推出了一种新型计算机断层扫描（CT）探测器，其集成了电子元件且传导路径更短，以降低系统固有电子噪声。本研究的目的是通过比较低剂量检查中采用传统探测器设计与集成电路探测器（ICD）的客观和主观图像质量，评估ICD在头部CT中的潜在益处。
使用传统探测器，对25例连续患者进行了低剂量非增强头部CT检查（255 mAs；有效剂量，1.7 mSv）。在转换为ICD后，对25例连续患者使用相同的成像参数进行扫描。两组图像均采用迭代重建（IR）和滤波反投影（FBP）进行重建，并从定量和定性图像质量方面进行评估。
使用ICD进行头部CT采集时，灰质和白质的信噪比分别提高了14%（10.0±1.6对11.4±2.5；P = 0.02）和17%（8.2±0.8对9.6±1.5；P = 0.000）。对比度噪声比的相关改善为12%（2.0±0.5对2.2±0.6；P = 0.121）。此外，客观图像清晰度提高了51%（582±85对884.5±191；HU/像素变化；P < 0.000）。与标准采集相比，ICD显著改善了噪声的主观分级和整体图像质量评分（2.1±0.3对1.6±0.3；P < 0.000；2.0±0.5对1.6±0.3；P = 0.001）。此外，后颅窝的条纹伪影显著减少（2.3±0.7对1.7±0.5；P = 0.004）。
在相同辐射水平下，使用ICD进行头部CT采集可实现更高的客观和主观图像质量，并为大幅降低剂量提供了可能。
