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OP 16<br />
Title<br />
IMPACT OF MOTION ON CbCT IMAGE QuALITy: EXPERIMENTAL RObOT STuDy<br />
Authors<br />
R. SPIN-NETO 1 , J. MuDRAK 2 , J. CHRISTENSEN 1 , L.H. MATzEN 1 , E. GOTFREDSEN 1 ,<br />
A. WENzEL 1<br />
Affiliations<br />
1 Aarhus University - Department of Oral Radiology, Aarhus, Denmark, Aarhus, DENMARK,<br />
2 Private Clinic, Ludwigsau, Germany, Ludwigsau, GERMANY<br />
Body<br />
Objective: To quantitatively <strong>as</strong>sess the impact of motion on CBCT image quality using a robot<br />
skull.<br />
Methods: Ten different motion sets were tested using a fully dentate human skull without<br />
dental restorations incorporated in a robot. An examination without motion served <strong>as</strong> reference.<br />
Three CBCT units were used: KaVo 3D eXam, Planmeca ProMax 3D MAX and Scanora 3D.<br />
A 100 mm visual analogue scale w<strong>as</strong> used to <strong>as</strong>sess image quality (IQ). Overall IQ w<strong>as</strong> <strong>as</strong>sessed<br />
from an axial image through the mental foramina (MF). Cross-sectional images of regions with<br />
diagnostic relevance (DR): lower third molars (TM) and MF bilaterally were further evaluated.<br />
Four blinded, independent and experienced examiners randomly <strong>as</strong>sessed the images in<br />
duplicate.<br />
Results: Lower overall IQ w<strong>as</strong> seen in the presence of movements in axial images<br />
(72.4±24.0 mm) compared to reference images (97.3±2.6 mm). For cross-sectional images,<br />
IQ w<strong>as</strong> lowest after tremor movements (18.1±23.8 right TM, 8.0±7.5 left TM, 15.3±16.6 right<br />
MF and 10.2±14.5 left MF) while reference images showed the highest IQ (90.3±8.5, 87.1±10.5,<br />
87.6±8.4 and 87.3±8.2, respectively). Mean IQ ranged from 74 to 89 and from 57 to 90 for<br />
isolated (tilting, rotation and nodding) and combined (nodding+tilting and rotation+tilting)<br />
movements, respectively. IQ for MF w<strong>as</strong> lower than that for TM for any movement, except for<br />
tremor.<br />
Conclusion: Motion decre<strong>as</strong>es CBCT image quality, but IQ depends on the motion set and on<br />
the evaluated region.<br />
Keywords<br />
Cone-Beam Computed Tomography,Artifacts,Motion<br />
aBSTracTS OP 1<br />
37
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