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KMID : 1143620140180020003
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Korean Journal of Nuclear Medicine Technology
2014 Volume.18 No. 2 p.3 ~ p.7
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Evaluation of the Effect of Metal Artifacts Varying the Parameters of the Attenuation Map for the artificial Hip Joint in SPECT/CT
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Kim Sang-Kyoo
Kim Jung-Yul
Park Min-Soo
Cho Seung-Hyun
Lim Han-Sang
Kim Jae-Sam
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Abstract
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Purpose : SPECT/CT scan to be performed attenuation correction on the basis of CT induce an overestimation of the site
due to the beam hardening artifact by metal cover and reduce the images quality. Therefore, this study using a phantom that has been inserted artificial hip joint investigated that effect on the SPECT/CT image causing by metal artifact for varying the parameters of the Attenuation Map.
Materials and Methods : Siemens Symbia T16 SPECT/CT equipment was used. Artificial hip joint was inserted to SPECT/PET phantom, 17 mm sphere of Bright Streak area in CT image was filled with Tc-99m so that the radiation activity
was 8 times compared to background. And then Hot and Background was measured in varying Wide Beam Coefficient on Attenuation Map and RBR (Region to Background Ratio) of Metal and Non-Metal was calculated and analyzed depending on the presence or absence of the hip joint.
Results : It tended to hot count of Non-Metal and Metal to increase as the value of the manual mode is increased, hot count ratio with the group of both manual mode 0.5 and 0.4 is the best match. Also, in automatic mode, the ratio of RBRNon-Metal and RBRMetal was 1.135, statistically significant difference was not observed in the manual mode 0.5 and 0.4.
Conclusion : In the automatic mode of Wide Beam Coefficient in attenuation correction map, it was found that it is over-correction by 13.52%, it was possible to minimize the over-correction by the artifact in 0.5 and 0.4 of manual mode. Further studies should be performed in order to apply to a patient with the help of this and it is considered possible to reduce the over-correction by the metal artifact of an artificial hip joint for Hip-Resurfacing Arthroplasty patients, and to improve the diagnostic performance.
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KEYWORD
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Attenuation Map, Artificial Hip Joint, Beam Hardening Artifact
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