|تاریخ چاپ: 1399/08/01|
|Is correction for metallic artefacts mandatory in cardiac SPECT/CT imaging in the presence of pacemaker and implantable cardioverter defibrillator leads?|
|Author(s):||Zahra Etemadi، Pardis Ghafarian *، Ahmad Bitarafan-Rajabi، Hadi Malek، Arman Rahmim، Mohammad Reza Ay|
IntroductionMetallic artifacts due to pacemaker/ implantable cardioverter defibrillator (ICD) leads in CT images can produce artifactual uptake in cardiac SPECT/CT images. The aim of this study was to determine the influence of the metallic artifacts due to pacemaker and ICD leads on myocardial SPECT/CT imaging.
MethodsThe study included 9 patients who underwent myocardial perfusion imaging (MPI). A cardiac phantom with an inserted solid defect was used. The SPECT images were corrected for attenuation using both artifactual CT and CT corrected using metal artifact reduction (MAR). VOI-based analysis was performed in artifactual regions.
ResultsIn phantom studies, mean-of-relative-difference in white-region, between artifact-free attenuation-map without/with MAR were changed from 9.2 and 2.1 to 3.7 and 1.2 for ICD and pacemaker lead, respectively. However, these values for typical patient were 9.7±7.0 and 3.8±2.4 for ICD and pacemaker leads respectively, in white-region. MAR effectively reduces the artifacts in white-regions while this reduction is not significant in black-regions.
ConclusionFollowing application of MAR, visual and quantification analyses revealed that while quality of CT images were significantly improved, the improvements in the SPECT/CT images were not as pronounced or significant. Therefore cardiac SPECT images corrected for attenuation using CT in the presence of metallic-leads can be interpreted without correction for metal artefacts.
|Keywords:||Cardiac SPECT، CT، Metal artifact reduction، Virtual sonogram، Pacemaker، ICD|
|Article Type:||Research/Original Article|
|Published:||Iranian Journal of Nuclear Medicine, Volume:26 Issue: 1, 2018|
|Full text:||PDF is available on the website.|