Comparison of clinical values of spectral CT with metal artifacts reduction system and high-spatial resolution algorithm CT scans in reducing metallic artifacts
Yin Bingxin, Chen Xingcan
Department of Radiology, the 117th Hospital of PLA, Hangzhou 310013, China
Abstract：Objective To investigate the clinical values of spectral CT with metal artifacts reduction system (MARs) and high-spatial resolution algorithm CT scans in the reduction of metal artifacts after internal spinal fixation.Methods The imaging data of 22 patients received internal spinal fixer implantation in the 117th Hospital of PLA from February 2013 to February 2014 were retrospectively analyzed. Of 22 patients, there were 14 males and 8 females, with age ranging from 30 to 77 years, and all the patients underwent spectral CT with MARs (MARs group) and bone algorithm CT scans (bone algorithm group) at different time after operation. The artifact index (AI) of each region of interest was measured and calculated, and the quality of bone window image was evaluated and scored by subjective assessment criteria of bone window image quality for comparison of the image quality of MARs group and bone algorithm group, followed by analysis of the differences in AI in MARs sub-groups with different single-energy values and bone algorithm groups.Results In the MARs group, AI was increased gradually with the decline of single-energy. There was significant difference in AI values of MARs sub-groups with different single-energy values and the bone algorithm group (F=8.696, P<0.05). Further LSD-t test between groups showed that, in the condition of 60-140 keV, AI values in MARs sub-groups were less than that of the bone algorithm group, and the differences were statistically significant (all P values<0.05). Furthermore, the quality of bone window image of the bone algorithm group was better than that of MARs sub-groups [(2.81±0.39) vs. (2.00 ± 0.53)], approaching the significant difference between the two groups (t= 4.856, P<0.01).Conclusions Spectral CT with MARs and high-spatial resolution algorithm CT scans have their own advantages in the reduction of metal artifacts after internal spinal fixation, so the appropriate CT imaging technology should be chosen according to clinical needs.
尹冰心, 陈兴灿. 能谱CT金属伪影消除技术和骨算法成像消减脊柱金属内固定物伪影的对比研究[J]. 中华解剖与临床杂志, 2017, 22(6): 448-451.
Yin Bingxin,Chen Xingcan. Comparison of clinical values of spectral CT with metal artifacts reduction system and high-spatial resolution algorithm CT scans in reducing metallic artifacts. Chinese Journal of Anatomy and Clinics, 2017, 22(6): 448-451.
Zhao S, Robertson DD, Wang G, et al. X-ray CT metal artifact reduction using wavelets: an application for imaging total hip prostheses[J]. IEEE Trans Med Imaging, 2000, 19(12): 1238-1247. DOI:10.1109/42.897816
[2]
Wang G, Snyder DL, O'Sullivan JA, et al. Iterative deblurring for CT metal artifact reduction[J]. IEEE Trans Med Imaging, 1996, 15(5): 657-664. DOI:10.1109/42.538943
[3]
Xia D, Roeske JC, Yu L, et al. A hybrid approach to reducing computed tomography metal artifacts in intracavitary brachytherapy[J]. Brachytherapy, 2005, 4(1): 18-23. DOI:10.1016/j.brachy.2004.11.001
2017, Vol. 22 
