能谱成像技术在减除脊柱金属植入物伪影方面的临床应用价值

发布时间：2018-04-15 00:22

本文选题：宝石CT + 脊柱　；参考：《山西医科大学》2012年硕士论文

【摘要】：目的：探讨宝石CT能谱成像技术在去除脊柱金属植入物放射状伪影方面的最佳的成像的单能量点，并评价其临床应用价值。方法：对20例在我院行脊柱外科手术，，并植入金属固定物的患者行宝石CT能谱扫描，扫描后获得（120Kvp）混合能量图像及70Kev单能量图像。用能谱分析软件（GSI viewer）进行分析，在40-140Kev（间距10Kev）重建11种单能量图像，然后选取最佳单能量图像行金属伪影消除重建（Metal-Artifacts Reduction System，MARs），获得MARs能谱图像(110Kev单能量+MARs图像）。由本科室3名高年资放射科诊断医师参照使用4分量表[1]，来对采集的图像质量高低进行主观目测评分；测量的放射状伪影为植入椎弓根螺钉前端伪影长度以评价其伪影轻重程度；于每组图像中选取伪影最重层面(A)行两次SD值测定记录为SD1、SD2，同时选择无或少伪影层面（B）行SD值测定记录为SD0，作为正常对照。对所获得数据采用spps17.0统计学软件包，进行配对t检验数据分析。结果：在11种单能量图像组中，随着Kev的增加，伪影长度将逐渐缩短，在110-140Kev区间伪影长度接近于零，且在此区间各组间伪影长度无明显差异；110Kev单能量图像组的伪影指数和噪声值最小，主观评分最高，因此所有20例患者的图像均于110Kev行MARs重建。MARs能谱图像组（110Kev单能量+MARS图像）与混合能量图像组的主观评分及伪影长度之间均存在显著性差异（P=0.0000.05），即MARs单能量图像组的脊柱金属植入物放射状伪影与混合能量组相比，伪影程度明显降低，图像质量较混合能量图像组显著提高。MARs能谱图像组与最佳单能量图像组的伪影长度及噪声值之间存在差异，即MARs能谱图像组较单能量图像组的图像质量有所提高。结论：在钛合金材质的脊柱金属植入物患者的单能量图像组中，110Kev为图像质量最佳的单能量成像点。在减除钛合金材质的脊柱金属植入物伪影时应联合应用单能量技术和MARs技术。宝石CT能谱成像技术能够显著减少脊柱金属植入物的伪影，使CT图像的质量明显提高，具有较高的临床应用价值。
[Abstract]:Objective: to investigate the best single energy point for removing radioactive artifacts from metal implants of spine by using gemstone CT energy spectrum imaging technique and to evaluate its clinical value.Methods: twenty patients who underwent spinal surgery in our hospital and were implanted with metal fixator were scanned by Sapphire CT energy spectrum. After scanning, mixed energy images and 70Kev single energy images were obtained.Eleven kinds of single energy images were reconstructed by using the energy spectrum analysis software (GSI viewer), and 11 kinds of single energy images were reconstructed in 40-140 Kevin (interval 10 Kevin). Then the best single energy images were selected for metal artifact elimination and reconstruction of Metal-Artifacts Reduction system Myers, and 110 Kev single energy MARs images were obtained.Three senior radiologists in our department used 4 subscales [1] to evaluate the quality of the collected images.The radial artifact was measured as the anterior artifact length of pedicle screw implantation to evaluate the degree of artifact.Two SD values were recorded as SD1 / SD2 in each group of images, and SD0 was used as the normal control.The obtained data were analyzed by spps17.0 statistical software package and paired t test data.Results: in 11 groups of single energy images, with the increase of Kev, the length of artifacts was gradually shortened, and the length of artifacts was close to zero in the range of 110-140Kev.In this interval, there was no significant difference in artifact length among groups. The artifact index and noise value of 110Kev single energy image group was the smallest, and the subjective score was the highest.Therefore, there was significant difference in the subjective score and artifact length between the 110Kev reconstruction of all 20 patients and the mixed energy image group (110Kev single energy MARS image), that is, the MARs single energy image group, that is, the MARs single energy image group.The radial artifacts of the metal implants in the spine were compared to those of the mixed energy group.Compared with the mixed energy image group, the artifact length and noise value of the energy spectrum image group and the best single energy image group were significantly improved, and there were differences between the artifact length and the noise value of the best single energy image group.That is, the image quality of MARs energy spectrum image group is better than that of single energy image group.Conclusion: 110Kev is the best single energy imaging point in the single energy image group of patients with titanium alloy spinal metal implants.Single energy technique and MARs technique should be used in removing the artifacts of titanium alloy metal implants.Gem CT energy dispersive imaging technique can significantly reduce the artifact of spinal metal implants and improve the quality of CT images, which has high clinical application value.
【学位授予单位】：山西医科大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：R816.8

【参考文献】