| 赵兴圣,张洪伟,李丽新,刘金刚,周茂义,岳奎涛,邵伟光,沈婷婷,张帅,曹会志.能谱成像技术减除125I粒子植入术后体内伪影[J].中国医学影像技术,2011,27(11):2344~2348 |
| 能谱成像技术减除125I粒子植入术后体内伪影 |
| Gemstone spectral imaging in removing metal artifacts produced by 125I radioactive particles |
| 投稿时间：2011-05-02 修订日期：2011-08-24 |
| DOI： |
| 中文关键词: 体层摄影术,X线计算机 能谱成像 碘放射性同位素 伪影 |
| 英文关键词:Tomography, X-ray computed Spectral imaging Iodine radioisotopes Artifacts |
| 基金项目: |
| 作者 | 单位 | E-mail | | 赵兴圣 | 潍坊医学院附属医院影像中心,山东 潍坊 261031 | | | 张洪伟 | 昌乐县宝城街道卫生院,山东 潍坊 262400 | | | 李丽新 | 潍坊医学院附属医院影像中心,山东 潍坊 261031 | lilxgo@yahoo.com.cn | | 刘金刚 | 潍坊医学院附属医院影像中心,山东 潍坊 261031 | | | 周茂义 | 潍坊医学院附属医院影像中心,山东 潍坊 261031 | | | 岳奎涛 | 潍坊医学院附属医院影像中心,山东 潍坊 261031 | | | 邵伟光 | 潍坊医学院附属医院影像中心,山东 潍坊 261031 | | | 沈婷婷 | 潍坊医学院附属医院影像中心,山东 潍坊 261031 | | | 张帅 | GE中国CT影像研究中心,北京 100176 | | | 曹会志 | GE中国CT影像研究中心,北京 100176 | |
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| 中文摘要: |
| 目的 探讨宝石CT能谱成像(GSI)和金属伪影去除序列(MARs)在减少金属粒子伪影的价值。方法 选择19例腹部植入125I粒子的患者,在相同CT剂量指数(CTDI)条件下进行GSI扫描。获得140 kVp混合能量图像;GSI在60~110 keV(间距10 keV)重建6种单能量图像及对应的MARs能谱图像。由3名放射医师主观评价3种成像方式的图像质量差异,并计算125I粒子邻近病变组织的对比噪声比(CNR)、噪声值及伪影指数(AI)。结果 ①70 keV图像质量明显高于混合能量的图像,主观评分差异具有统计学意义(t=11.95,P<0.001);②不同keV单能量图像中,70 keV图像的125I粒子邻近组织CNR最佳(0.81±0.20),且主观评分最高(2.79±0.21);80 keV图像的AI最低71.78±20.70;110 keV图像中伪影长度最小 ;③MARs能谱图像中高密度金属伪影减少,125I粒子不同程度被消除并产生低密度伪影。110 keV图像中金属伪影的长度小于混合能量图像及MARs能谱图像(t=3.42、3.97,P均<0.05);MARs能谱图像与混合能量及70 keV图像的CNR差异有统计学意义(t=3.63、4.05,P均<0.01)。结论 GSI技术能有效减少CT图像中125I粒子的金属伪影,提高图像质量,改善125I粒子植入术后邻近组织的显示情况。MARs技术不能有效消除放射性粒子产生的伪影。 |
| 英文摘要: |
| Objective To investigate the value of gemstone spectral imaging (GSI) in removing metal artifacts generated by 125I radioactive particles. Methods Non-enhanced GSI scan was performed in 19 patients with 125I radioactive particles implantation in abdomen to obtain the polychromatic images (140 kVp) and 6 sets of monochromatic images (60-110 keV with interval of 10 keV) and MARs images. Subjective image quality of three methods was assessed by 3 radiologists in consensus. CNR of the structure near 125I radioactive particles and noise of background and artifact index (AI) were calculated. Results In energy level scope of 60 to 110 keV, the higher the energy level, the weaker the metal artifacts, CNR and noise. The optimal CNR (0.8±0.20) and subjective rating (2.79±0.21) was acquired at the energy level of 70 keV. Lowest of AI was acquired at 80 keV images. High density metal artifacts decreased in MARs images, with elimination of 125I radioactive particles in some degree, while low density artifacts and noises increased. The mean CNR was smaller on MARs images than that on polychromatic images and 70 keV images (t=3.63, 4.05, P<0.01). Subjective image quality scale of 70 keV was significantly higher than that of 140 kVp (t=11.95, P<0.001). Conclusion In the non-enhanced abdominal CT of GSI, the optimal monochromatic level of 70 keV can provide both good subjective image quality and optimal CNR. However, MARs is not an effective method for patients with small metal implantation such as 125I radioactive particles. |
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