| 王军,叶靖,孙骏,吴晶涛,王守安,罗先富,孙继全,朱庆强,王志军.宝石CT能谱成像140 keV单能图结合水基图检查肝脏[J].中国医学影像技术,2013,29(5):761~764 |
| 宝石CT能谱成像140 keV单能图结合水基图检查肝脏 |
| 140 keV monochromatic energy images combined with water-based images in gemstone spectral imaging of liver |
| 投稿时间：2012-10-22 修订日期：2013-01-24 |
| DOI： |
| 中文关键词: 肝 体层摄影术,X线计算机 能谱成像 辐射剂量 |
| 英文关键词:Liver Tomography, X-ray computed Gemstome spectral imaging Radiation dosage |
| 基金项目: |
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| 中文摘要: |
| 目的 探讨宝石CT能谱成像(GSI)140 keV单能图结合水基图扫查肝脏的价值。 方法 对45例接受肝脏平扫和增强扫描CT患者,在完成常规平扫及三期增强扫描后,采用肝脏能谱后处理分析软件生成140 keV单能图和水基图;比较平扫图像、140 keV单能图和水基图对肝内病灶的显示情况,对比分析平扫图像与140 keV单能图中肝脏、肌肉的CT值、SNR以及单期和总容积CT剂量指数(CTDIvol)、剂量长度乘积(DLP)。 结果 在显示病灶方面,140 keV单能图、水基图与平扫图像无明显差异;肝脏CT值140 keV单能图略高于平扫图像,而SNR 140 keV单能图低于平扫图像(P均<0.05);140 keV单能图和水基图的总CTDIvol和DLP均低于平扫图像(P均<0.05)。 结论 GSI肝脏三期增强扫描中,利用140 keV单能图结合水基图有可能取代平扫图像,以利于降低辐射剂量。 |
| 英文摘要: |
| Objective To explore the clinical value of 140 keV monochromatic energy images combined with water-based images in gemstone spectral imaging (GSI) of liver. Methods 140 keV monochromatic energy images and water-based images were obtained in 45 patients underwent liver CT scan after conventional plain, arterial, portal and equilibrium phase enhanced scan. The visualization and display of lesions in plain images, 140 keV monochromatic energy images and water-based images were compared. CT values of liver and muscle, image SNR as well as volumetric CT dose index (CTDIvol) and dose length product (DLP) were compared among 140 keV monochromatic energy images, water-based images and plain CT images. Results There was no significant difference of lesions display among 140 keV monochromatic energy images or water-based images and conventional plain images, while CT value in 140 keV monochromatic energy images was higher and SNR was lower than those in plain images (both P<0.05). In 140 keV monochromatic energy imaging and water-based imaging, the total CTDIvol and DLP were lower than those in plain scanning (both P<0.05). Conclusion For three-phase liver scanning using GSI, 140 keV monochromatic energy imaging combined with water-based imaging may replace the conventional plain scanning, being helpful to decrease radiation dose in clinical application. |
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