The effect of computed tomographic scanner parameters and 3-dimensional volume rendering techniques on the accuracy of linear, angular, and volumetric measurements of the mandible

Whyms, Brian J.; Vorperian, Houri K.; Gentry, Lindell R.; Schimek, E. Michael; Bersu, Edward T.; Chung, Moo K.

doi:10.1016/j.oooo.2013.02.008

Cited by 88 publications

(51 citation statements)

References 40 publications

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“…The objective of this study was to quantify and compare dimension fidelity as some of the process variables are systematically changed. Other studies have investigated the impact of CT scanning parameters on accuracy of volume-rendered models [16], but this is one of the first studies to quantitatively investigate the geometric accuracy of a complex anatomic structure throughout the acquisition, processing, and printing stages.…”

Section: Introductionmentioning

confidence: 99%

Factors Affecting Dimensional Accuracy of 3-D Printed Anatomical Structures Derived from CT Data

et al. 2015

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Additive manufacturing and bio-printing, with the potential for direct fabrication of complex patient-specific anatomies derived from medical scan data, are having an ever-increasing impact on the practice of medicine. Anatomic structures are typically derived from CT or MRI scans, and there are multiple steps in the model derivation process that influence the geometric accuracy of the printed constructs. In this work, we compare the dimensional accuracy of 3-D printed constructs of an L1 vertebra derived from CT data for an ex vivo cadaver T-L spine with the original vertebra. Processing of segmented structures using binary median filters and various surface extraction algorithms is evaluated for the effect on model dimensions. We investigate the effects of changing CT reconstruction kernels by scanning simple geometric objects and measuring the impact on the derived model dimensions. We also investigate if there are significant differences between physical and virtual model measurements. The 3-D models were printed using a commercial 3-D printer, the Replicator 2 (MakerBot, Brooklyn, NY) using polylactic acid (PLA) filament. We found that changing parameters during the scan reconstruction, segmentation, filtering, and surface extraction steps will have an effect on the dimensions of the final model. These effects need to be quantified for specific situations that rely on the accuracy of 3-D printed models used in medicine or tissue engineering applications.

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Section: Introductionmentioning

confidence: 99%

Factors Affecting Dimensional Accuracy of 3-D Printed Anatomical Structures Derived from CT Data

et al. 2015

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“…We compared the virtual repairs with the actual postoperative result using radiographic landmarks [12]. Standardized mandibular measurements were recorded using Prism 6.0 (GraphPad; San Diego, California) after all 10 users completed their surgical simulations of the three fracture cases using both systems.…”

Section: Standard Landmarks and Measurementsmentioning

confidence: 99%

Haptic feedback improves surgeons’ user experience and fracture reduction in facial trauma simulation

et al. 2016

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Abstract-Computer-assisted surgical (CAS) planning tools are available for craniofacial surgery but are usually based on computer-aided design (CAD) tools that lack the ability to detect the collision of virtual objects (i.e., fractured bone segments). We developed a CAS system featuring a sense of touch (haptic) that enables surgeons to physically interact with individual, patient-specific anatomy and immerse in a threedimensional virtual environment. In this study, we evaluated initial user experience with our novel system compared to an existing CAD system. Ten surgery resident trainees received a brief verbal introduction to both the haptic and CAD systems. Users simulated mandibular fracture reduction in three clinical cases within a 15 min time limit for each system and completed a questionnaire to assess their subjective experience. We compared standard landmarks and linear and angular measurements between the simulated results and the actual surgical outcome and found that haptic simulation results were not significantly different from actual postoperative outcomes. In contrast, CAD results significantly differed from both the haptic simulation and actual postoperative results. In addition to enabling a more accurate fracture repair, the haptic system provided a better user experience than the CAD system in terms of intuitiveness and self-reported quality of repair.

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“…Computed tomography (CT) scans are effective for in vivo imaging of osseous structures. Anatomical measurements (such as length, width and volume of bones) taken from CT scans have been verified on larger bones such as femurs, humeri and mandibles (Stull et al, 2013; Whyms et al, 2013). These studies have shown that measurements gathered from CT scans are accurate, but that scanning and reconstruction parameters are complex and must be precise.…”

Section: Introductionmentioning

confidence: 99%

Hyoid Bone Development: An Assessment Of Optimal CT Scanner Parameters and Three‐Dimensional Volume Rendering Techniques

Cotter

Whyms

Kelly

et al. 2015

The Anatomical Record

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The hyoid bone anchors and supports the vocal tract. Its complex shape is best studied in three dimensions, but it is difficult to capture on computed tomography (CT) images and three-dimensional volume renderings. The goal of this study was to determine the optimal CT scanning and rendering parameters to accurately measure the growth and developmental anatomy of the hyoid and to determine whether it is feasible and necessary to use these parameters in the measurement of hyoids from in vivo CT scans. Direct linear and volumetric measurements of skeletonized hyoid bone specimens were compared to corresponding CT images to determine the most accurate scanning parameters and three-dimensional rendering techniques. A pilot study was undertaken using in vivo scans from a retrospective CT database to determine feasibility of quantifying hyoid growth. Scanning parameters and rendering technique affected accuracy of measurements. Most linear CT measurements were within 10% of direct measurements; however, volume was overestimated when CT scans were acquired with a slice thickness greater than 1.25 mm. Slice-by-slice thresholding of hyoid images decreased volume overestimation. The pilot study revealed that the linear measurements tested correlate with age. A fine-tuned rendering approach applied to small slice thickness CT scans produces the most accurate measurements of hyoid bones. However, linear measurements can be accurately assessed from in vivo CT scans at a larger slice thickness. Such findings imply that investigation into the growth and development of the hyoid bone, and the vocal tract as a whole, can now be performed using these techniques.

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The effect of computed tomographic scanner parameters and 3-dimensional volume rendering techniques on the accuracy of linear, angular, and volumetric measurements of the mandible

Cited by 88 publications

References 40 publications

Factors Affecting Dimensional Accuracy of 3-D Printed Anatomical Structures Derived from CT Data

Factors Affecting Dimensional Accuracy of 3-D Printed Anatomical Structures Derived from CT Data

Haptic feedback improves surgeons’ user experience and fracture reduction in facial trauma simulation

Hyoid Bone Development: An Assessment Of Optimal CT Scanner Parameters and Three‐Dimensional Volume Rendering Techniques

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