Influence of Metal Implants on Quantitative Evaluation of Bone Single-Photon Emission Computed Tomography/Computed Tomography

被引:2
作者
Oe, Keisuke [1 ]
Zeng, Feibi [2 ]
Niikura, Takahiro [1 ]
Fukui, Tomoaki [1 ]
Sawauchi, Kenichi [1 ]
Matsumoto, Tomoyuki [1 ]
Nogami, Munenobu [2 ,3 ]
Murakami, Takamichi [2 ]
Kuroda, Ryosuke [1 ]
机构
[1] Kobe Univ, Dept Orthopaed Surg, Grad Sch Med, Chuo Ku, Kobe, Hyogo 6500017, Japan
[2] Kobe Univ, Dept Radiol, Grad Sch Med, Chuo Ku, Kobe, Hyogo 6500017, Japan
[3] Univ Fukui, Biomed Imaging Res Ctr, Fukui 9101193, Japan
关键词
bone; computed tomography-based attenuation correction; single-photon emission computed tomography; computed tomography; metal implant; standardized uptake value; NONUNION; SPECT/CT;
D O I
10.3390/jcm11226732
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
When visualizing biological activity at nonunion sites by the radioisotopes, gamma rays are more attenuated if metal implants are placed in the bone. However, the effects of various implant types and their placement on gamma ray attenuation in quantitative evaluation remain unknown. To elucidate these effects, we created a phantom that simulated the nonunion of the femur in this study. The count of gamma rays was measured by single-photon emission computed tomography/computed tomography (SPECT/CT) while considering CT-based attenuation correction (CTAC), metal implant placement, type (intramedullary nail or plate), and position. The count differed significantly with and without CTAC and with and without implants (both types) under CTAC. Significantly different counts were observed between the intramedullary nail and plate placed contralaterally to the lesion (i.e., non-lesion side). No significant difference was observed between the intramedullary nail and plate on the lesion side or between plates on the non-lesion and lesion sides. The measured standardized uptake value (SUV) was closer to the true SUV with CTAC than without. Moreover, the count was higher with implants than without. However, even with implants, it was lower than the actual count, indicating the absence of overcorrection. Implant type and position do not seem to influence the count.
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