Geometric accuracy of the NewTom 9000 Cone Beam CT

Marmulla, Rüdiger; Wörtche, René; Mühling, Joachim; Haßfeld, Stefan

doi:10.1259/dmfr/31342245

Cited by 195 publications

(140 citation statements)

References 10 publications

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“…For convenience and practical reasons, the geometrical ground truth is very often a software or hardware phantom [10][11][12][13], possibly abstract in shape, or a dry cadaver [14]. Studies on cadavers with soft tissue [15][16][17][18] are more elaborate, and are practically limited to a feasible number of measurements, especially if these are to be processed manually.…”

Section: Introductionmentioning

confidence: 99%

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Accuracy assessment of CT-based outer surface femur meshes

Gelaude

Sloten

Lauwers

2008

Computer Aided Surgery

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Objectives: Computer-aided bone surgery planning and implant design applications require accurate and compact representations of the patient's bone. The accuracy of bone segmentation from medical images has been studied extensively, with each study using a specific ground truth and a specific type and number of accuracy measurements. However, for convenience and practical reasons these three specifications have always been limited. The goal of this study is to thoroughly assess the absolute 3D accuracy of CT-based bone outer surface meshes, using femora as the examples. Materials and Methods: Using dense and very accurate optical surface scans of 15 dried femora as an absolute ground truth, this paper reports on the absolute 3D geometric accuracy of triangulated bone outer surface meshes, which were segmented from the CT scans of the corresponding formalin-fixed intact cadaver specimens using the author's previously presented contour-based segmentation algorithm on the one hand, and the commercially available Mimics Õ software (Materialise N.V., Leuven, Belgium) on the other. The study incorporates the effect of soft tissue presence on hard tissue segmentation and simultaneously reveals the accuracy shift introduced as a result of boiling the cadaver bones by processing extra CT scans of the dried bones. Results: The presented study demonstrates that, when using the optimal parameter settings for the respective segmentation procedures, sub-voxel mesh accuracies can be attained. Compact surface representations of femora can be generated with mean absolute accuracies of up to one fifth of the voxel size and Root Mean Square (RMS) error of half the voxel size. Conclusions: The 3D accuracy of the contour-based segmentation previously presented by the author makes it most suitable for generating outer bone surface meshes for use in the aforementioned applications. The optimal parameter settings for this segmentation procedure have been identified. For the Mimics Õ bone surface meshes, a single, but excellent, pre-defined set of parameters was identified.

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Section: Introductionmentioning

confidence: 99%

“…Marmulla et al built an abstractly shaped test cube with accurately known reference points, and assessed the 3D deviations for 172 corresponding -manually segmented -points in the CT data [13]. Cavalcanti et al performed two specific linear measurements in all 2D resliced CT images of 8 cadaver maxillae [18].…”

Section: Introductionmentioning

confidence: 99%

Accuracy assessment of CT-based outer surface femur meshes

Gelaude

Sloten

Lauwers

2008

Computer Aided Surgery

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“…Measurement accuracy of CBCT can be good (within 1 pixel longitudinally and up to 2.35 pixels horizontally 60 ) with good geometric accuracy (mean deviations 0.13±0.09 mm from three co-ordinate axes 61 ). However, with increasing voxel size there can be a tendency to underestimate volumetric measurements which can become significant above 300µm 62 .…”

Section: X-raysmentioning

confidence: 95%

Surfing the spectrum – what is on the horizon?

et al. 2013

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“…Contribuindo para a consolidação da precisão das imagens de TCFC, análises geométricas das medidas também foram analisadas em alguns estudos (Marmulla et al, 2005;Baltrick et al, 2008;Primo et al, 2012) obtendo significativos resultados.…”

Section: Variação: Examinadores E Momentosunclassified

Acurácia de medidas lineares em softwares de planejamento de implantes sobre imagens de mandibulas atróficas obtidas por tomografias computadorizadas de feixe cônico com diferentes protocolos de aquisição

Barbosa¹

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Geometric accuracy of the NewTom 9000 Cone Beam CT

Abstract: The digital volume tomographies of NewTom 9000 present images which are geometrically correct and, from a geometrical point of view, suitable for three-dimensional implant planning.

Cited by 195 publications

References 10 publications

Accuracy assessment of CT-based outer surface femur meshes

Accuracy assessment of CT-based outer surface femur meshes

Surfing the spectrum – what is on the horizon?

Acurácia de medidas lineares em softwares de planejamento de implantes sobre imagens de mandibulas atróficas obtidas por tomografias computadorizadas de feixe cônico com diferentes protocolos de aquisição

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