切换至 "中华医学电子期刊资源库"

中华消化病与影像杂志(电子版) ›› 2018, Vol. 08 ›› Issue (03) : 112 -115. doi: 10.3877/cma.j.issn.2095-2015.2018.03.004

所属专题: 文献

临床研究

柱状金属模体CT伪影的相关分析与研究
李巍伟1, 连涛1, 翟继良1,()   
  1. 1. 271000 山东省,泰安市中心医院分院放射科
  • 收稿日期:2017-09-01 出版日期:2018-06-01
  • 通信作者: 翟继良

Correlation analysis and research of CT artifacts of columnar metal phantom

Weiwei Li1, Tao Lian1, Jiliang Zhai1,()   

  1. 1. Department of Radiology, Tai′an Central Hospital Branch, Tai′an 271000, China
  • Received:2017-09-01 Published:2018-06-01
  • Corresponding author: Jiliang Zhai
  • About author:
    Corresponding author: Zhai Jiliang, Email:
引用本文:

李巍伟, 连涛, 翟继良. 柱状金属模体CT伪影的相关分析与研究[J]. 中华消化病与影像杂志(电子版), 2018, 08(03): 112-115.

Weiwei Li, Tao Lian, Jiliang Zhai. Correlation analysis and research of CT artifacts of columnar metal phantom[J]. Chinese Journal of Digestion and Medical Imageology(Electronic Edition), 2018, 08(03): 112-115.

目的

通过对不同直径柱状金属模体扫描并与空扫图像对比,研究金属模体伪影对周围像素CT值影响。

方法

相同条件扫描不同直径柱状金属模体,并与空扫图像作对照,确定研究像素的范围,以单一像素测量单位,测量两种模体图像对应研究区域的像素CT值并与空扫形成像素CT值数据做对照,研究分析CT值变化特点。

结果

通过不同直径金属模体扫描并与空扫对比,柱状金属模体对周围像素的CT值均产生确切影响,导致周围像素CT值较空扫均不同程度增加,不同直径模体间对像素CT值影响程度存在差异。射束硬化在柱状金属周缘形成环状伪影,其像素CT值显著区别于邻近像素CT值的变化。

结论

金属模体对其周围像素CT值影响与模体直径正相关,与像素和模体距离负相关,射束硬化现象使金属模体周缘像素CT值远低于邻近像素。

Objective

To investigate the effects of metal artifact artifacts on the CT values of surrounding pixels are investigated by scanning different diameter columnarcylindrical metal modules and comparing them with empty scanning images.

Methods

The same scanning of different diameter columnar metal modules were scanned in the same condition, and compared with empty scanning images.The range of pixel was mould body, and empty scan images were determined.on the range of pixels, a single pixel CT pixel unit of measurement, measurement of The pixel CT values of two kinds of phantom images corresponding to the study area were measured by single pixel measurement unit, and compared with value and air scan form pixelthe CT values of empty scanning images data control, analysis t. The changing characteristicses of CT values were analyzed.

Results

Through the comparison of different diameter metal module scanning and emptyair scanning, the columnarcylindrical metal mold has had a definite influence on the CT value of the surrounding pixels, resulting in the increase of the CT value of the surrounding pixels to different degrees comapred with empty scanning, and t. The influence degree of pixel CT value between different diameter modules wais different.The ring artifact was formed by beam hardening is formed by a circular artifact atin the columnar metal peripheryrim, and its pixel CT value wais significantly different from the change in the CT value of the adjacent pixels.

Conclusion

The influence of the metal module on the CT value of the surrounding pixel is positively related to the moduledie diameter, and is negatively related to the pixel and module distance.The beam hardening causes the CT value of the peripheral pixel of the metal module to be much lower than that of the neighboring pixel.

图1 1A为粗柱状金属扫描图像,1B为细柱状金属扫描图像,1C为空扫图像,横线通过圆形扫描野的中心,对应图像矩阵序列左侧起始为0,最右侧为511,图中横线为研究基线,所研究像素位于基线的左半部分,序列左侧起始为0,右侧最远为256。
图2 三种模态像素序列与像素CT值对应关系,横坐标为自左向右像素序列号,纵轴为测得像素的CT值(单位HU)
图3 不同模态扫描图像确定的研究像素(基线)所在区域的窄幅图像,横向对应的像素位置相同
表1 CT值数据积分(HU)
1
Veldkamp WJ, Joemai RM, van der Molen AJ, et al.Development and validation of segmentation and interpolation techniques in sinograms for metal artifact suppression in CT[J]. Med Phys, 2010, 37(2): 620-628.
2
钱根年,陈自谦,付丽媛,等.多层螺旋CT图像常见伪影的影响因素与解决方案[J].中国医学装备, 2017, 14(05): 18-22.
3
Abu Anas EM, Lee SY, Hasan MK.Removal of ring artifacts in CT imaging through detection and correction of stripes in the sinogram.[J]. Phys Med Biol, 2010, 55(22): 6911-6930.
4
Low DA, White BM, Lee PP, etal.A novel CT acquisition and analysis technique for breathing motion modeling.[J]. Phys Med Biol, 2013, 58(11): L31-36.
5
孙鸿飞,高留刚,倪昕晔.计算机断层扫描图像金属伪影校正方法研究现状[J].中国医学影像技术, 2017, 33(04)616-619.
6
Hsieh J..Computed tomography: principles, design, artifacts, and recent advances[M]. SPIE Press, 2009.
7
Yazdi M, Mohammadi M. Metal Artifact Reduction in Dental Computed Tomography Images Based on Sinogram Segmentation Using Curvelet Transform Followed by Hough Transform[J]. J Med Signals Sens, 2017, 7(3): 145-152.
8
刘思伟,董硕,白玫,等.CT图像金属伪影的处理方法[J].中国医学装备, 2014, 11(11): 77-82.
9
Prell D, Kyriakou Y, Beister M, et al.A novel forward projection-based metal artifact reduction Method for flat-detector computed tomography[J]. Phys Med Biol, 2009, 54(21): 6575-6591.
10
Choi J, Kim KS, Kim MW, etal.Sparsity driven metal part reconstruction for artifact removal in dental CT[J]. J X-Ray Sci Technol, 2011, 19(4): 457-475.
11
郁斌,吕富荣,张黎,等.胸部CT扫描中迭代去金属伪影算法减少金属伪影的有效性[J].中国医学影像技术, 2017, 33(4): 590-593.
12
Liang X, Zhang Z, Niu T, et al.Iterative image-domain ring artifact removal in cone-beam CT[J]. Phys Med Biol, 2017, 62(13): 5276-5292.
13
Kalisz K, Buethe J, Saboo SS, et al.Artifacts at Cardiac CT: Physics and Solutions[J]. Radiographics, 2016, 36(7): 2064-2083.
14
Xie H, Tang X. Optimization of data acquisition in axial CT under the framework of sampling on lattice for suppression of aliasing artifacts with algorithmic detector interlacing[J]. Med Phys, 2017, 44(12): 6239-6250.
15
Groβe Hokamp N, Neuhaus V, Abdullayev N, et al.Reduction of artifacts caused by orthopedic hardware in the spine in spectral detector CT examinations using virtual monoenergetic image reconstructions and metal-artifact-reduction algorithms[J]. Skeletal Radiol, 2018, 47(2): 195-201.
16
何卫红,方向军,彭建春,等.螺旋CT图像常见伪影的分析和处理[J].中南医学科学杂志, 2011, 39(6): 692-694.
17
程春,陈蕾,梁晓航,等.腰椎间盘突出MR工与CT诊断的应用的价值分析[J].中国CT与MRI杂志, 2014, 12(7): 97-93.
18
杨震,杨树欣,高磊,等.CT图像伪影消除技术的研究[J].中国医学装备, 2015, 12(2): 30-33.
19
Einstein AJ, Henzlova MJ, Rajagopalan S. Estimating risk of cancer associated with radiation exposure from 64-slice computed tomography coronary angiography.[J]. JAMA, 2007, 298(3): 317-323.
20
Silverman SG, Tuncali K, Adams DF, et al.CT fluoroscopy-guided abdominal interventions: techniques, results, and radiation exposure.[J]. Radiology, 1999, 212(3): 673-681.
21
陈豫.CT图像金属伪影校正算法研究[D].合肥:中国科学技术大学,2009.
[1] 周子健, 吴忠. CT在泌尿系结石诊疗中的应用进展[J]. 中华腔镜泌尿外科杂志(电子版), 2023, 17(03): 299-302.
[2] 韦巍, 黄剑华, 钟羽翔, 麦源, 徐战平. 2~3 cm肾结石的CT值对输尿管软镜碎石效果的预估价值[J]. 中华腔镜泌尿外科杂志(电子版), 2019, 13(02): 95-98.
[3] 彭毅, 卜强, 秦锁炳, 蒋东方, 曾明辉, 宁松毅. 结石CT值对输尿管软镜钬激光碎石效率影响的研究[J]. 中华腔镜泌尿外科杂志(电子版), 2017, 11(05): 302-305.
[4] 戴书华, 刘国芳, 向东生. 肺磨玻璃结节CT值测量在早期癌症诊断中的意义[J]. 中华肺部疾病杂志(电子版), 2019, 12(06): 770-771.
[5] 杨天池, 韩威, 邱枫, 祁佳慧. 术中胰腺超声弹性成像在胰腺质地评估中的应用[J]. 中华肝脏外科手术学电子杂志, 2023, 12(06): 646-650.
[6] 王晓耘, 黑振宇, 靳龙洋, 韩超, 沈军, 王健东. CT值对原发性肝癌肝周淋巴结转移的诊断价值[J]. 中华肝脏外科手术学电子杂志, 2016, 05(03): 168-172.
[7] 梅碧, 罗倩, 赵佳, 张蕾, 吴晓明. 双源CT能谱纯化单能量技术在评估喙锁韧带中的价值[J]. 中华肩肘外科电子杂志, 2022, 10(02): 135-140.
[8] 雷礼辉, 李峰, 罗光平, 刘洪, 杨骐彰, 吴涛, 翁睿. 椎体CT值对原发性骨质疏松症唑来膦酸钠疗效的评价价值[J]. 中华老年骨科与康复电子杂志, 2022, 08(05): 285-289.
阅读次数
全文


摘要