Impact of metallic dental implants on CT-based attenuation correction in a combined PET/CT scanner

被引：129
|
作者：
Kamel, EM [1 ]
Burger, C [1 ]
Buck, A [1 ]
von Schulthess, GK [1 ]
Goerres, GW [1 ]
机构：
[1] Univ Zurich Hosp, Div Nucl Med, CH-8091 Zurich, Switzerland
来源：
EUROPEAN RADIOLOGY | 2003年 / 13卷 / 04期
关键词：
PET; CT; attenuation correction; artifacts;
D O I：
10.1007/s00330-002-1564-2
中图分类号：
R8 [特种医学]; R445 [影像诊断学];
学科分类号：
1002 ; 100207 ; 1009 ;
摘要：
Our objective was to study the effect of metal-induced artifacts on the accuracy of the CT-based anatomic map as a prerequisite for attenuation correction of the positron emission tomography (PET) emission data. Twenty-seven oncology patients with dental metalwork were enrolled in the present study. Data acquisition was performed on a PET/CT in-line system (Discovery LS, GE Medical Systems, Milwaukee, Wis.). Attenuation correction of emission data was done twice, using an 80-mA CT scan (PETCT80) and a Ge-68 transmission scan (PET68Ge)Average count in kBq/cc was measured in regions with and without artifacts and compared for PETCT80 and PET68Ge. Data analysis of region of interests (ROIs) revealed that the ratio (ROIs PETCT80/ROIs PET68Ge) and the difference (ROIs PETCT80 minus ROIs PET68Ge) had a higher mean of values in regions with artifacts than in regions without artifacts (1.2 +/- 0.17 vs 1.06 +/- 0.06 and 0.68 +/- 0.67 vs 0.15 +/- 0.17 kBq/cc, respectively). For most of the studied artifactual ROIs, the PETCT80 values were higher than those of the PET68Ge. Attenuation correction of PET emission data using an artifactual CT map yields false values in regions nearby artifacts caused by dental metalwork. This may falsely estimate PET quantitative studies and may disturb the visual interpretation of PET scan.
引用
收藏
页码：724 / 728
页数：5
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