Obstacles in spatial evaluation of CBCT-reformatted panoramic imaging
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Obstacles in spatial evaluation of CBCT-reformatted panoramic imaging. / Wikner, Johannes; Friedrich, Reinhard E; Rashad, Ashkan; Schulze, Dirk; Hanken, Henning; Heiland, Max; Gröbe, Alexander; Riecke, Björn.
in: DENTOMAXILLOFAC RAD, Jahrgang 45, Nr. 4, 2016, S. 20150436.Publikationen: SCORING: Beitrag in Fachzeitschrift/Zeitung › SCORING: Zeitschriftenaufsatz › Forschung › Begutachtung
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TY - JOUR
T1 - Obstacles in spatial evaluation of CBCT-reformatted panoramic imaging
AU - Wikner, Johannes
AU - Friedrich, Reinhard E
AU - Rashad, Ashkan
AU - Schulze, Dirk
AU - Hanken, Henning
AU - Heiland, Max
AU - Gröbe, Alexander
AU - Riecke, Björn
PY - 2016
Y1 - 2016
N2 - OBJECTIVES: Conventional panoramic radiography (cPR) underlines procedure-related limitations in the display of objects. CBCT is presumed to overcome these constraints. To virtualize a cPR view, reformatted panoramic images (rPIs) can be generated. This study evaluated the rPI with regard to its susceptibility to sterical object deposition in comparison with cPR.METHODS: A specially developed implant model with dental implants each of 4.0-mm diameter and 11.0-mm length was depositioned by shift, rotation and tilt of 5.00 mm (±0.01 mm) of horizontal shift and 5.0° (±0.167°), respectively, on a highly precise goniometer rotation table, and cPRs and rPIs were generated. Automated evaluation of the cPRs was carried out using a specially developed software. rPIs were processed and analyzed by a semi-automated image analysis.RESULTS: Object deposition lead to distortive effects in the rPI analogue to cPR, but they appear in display only. Objects illustrated in the rPI were dimensionally correct, but sterical relations are elusive. Results are obtained for the horizontal shift, declination and reclination, lateral tilt and rotation.CONCLUSIONS: Distortions within the rPI represent the illustration of the hyperbolic-shaped layer out of the three-dimensional data set. With this study, we demonstrated these procedure-related inherent but practically underestimated consequences. Effects of sterical object malpositioning must be compensated by the observer by adequate virtual adjustment of the processed layer. Accurate virtual adjustment leads to vertical dimensions. Sterical relations, e.g. angulation of two objects, are irretraceable unless precisely referenced.
AB - OBJECTIVES: Conventional panoramic radiography (cPR) underlines procedure-related limitations in the display of objects. CBCT is presumed to overcome these constraints. To virtualize a cPR view, reformatted panoramic images (rPIs) can be generated. This study evaluated the rPI with regard to its susceptibility to sterical object deposition in comparison with cPR.METHODS: A specially developed implant model with dental implants each of 4.0-mm diameter and 11.0-mm length was depositioned by shift, rotation and tilt of 5.00 mm (±0.01 mm) of horizontal shift and 5.0° (±0.167°), respectively, on a highly precise goniometer rotation table, and cPRs and rPIs were generated. Automated evaluation of the cPRs was carried out using a specially developed software. rPIs were processed and analyzed by a semi-automated image analysis.RESULTS: Object deposition lead to distortive effects in the rPI analogue to cPR, but they appear in display only. Objects illustrated in the rPI were dimensionally correct, but sterical relations are elusive. Results are obtained for the horizontal shift, declination and reclination, lateral tilt and rotation.CONCLUSIONS: Distortions within the rPI represent the illustration of the hyperbolic-shaped layer out of the three-dimensional data set. With this study, we demonstrated these procedure-related inherent but practically underestimated consequences. Effects of sterical object malpositioning must be compensated by the observer by adequate virtual adjustment of the processed layer. Accurate virtual adjustment leads to vertical dimensions. Sterical relations, e.g. angulation of two objects, are irretraceable unless precisely referenced.
KW - Cone-Beam Computed Tomography
KW - Dental Implants
KW - Humans
KW - Image Processing, Computer-Assisted
KW - Imaging, Three-Dimensional
KW - Radiographic Image Interpretation, Computer-Assisted
KW - Radiography, Panoramic
KW - Reproducibility of Results
KW - Rotation
KW - User-Computer Interface
U2 - 10.1259/dmfr.20150436
DO - 10.1259/dmfr.20150436
M3 - SCORING: Journal article
C2 - 26959644
VL - 45
SP - 20150436
JO - DENTOMAXILLOFAC RAD
JF - DENTOMAXILLOFAC RAD
SN - 0250-832X
IS - 4
ER -