Automatic Hole Repairing for Cranioplasty Using Bézier Surface Approximation

Sing, Chong Chiet; Pueh, Lee Heow; Kumar, Ashavani

doi:10.1097/01.scs.0000180009.75857.81

Cited by 5 publications

(4 citation statements)

References 9 publications

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“…Optimal triangulation of the skull surface based on a global minimization of dihedral angles utilizing a genetic algorithm coupled with rough set theory has been proposed as another automatic defect-repairing algorithm. 24 Direct least squarē tting of ellipses using the skull voxels has been applied to an i MSP-¯nding algorithm. 25,26 This method may also be used to repair the defect after the ellipses have been found.…”

Section: Discussionmentioning

confidence: 99%

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Automated Volumetry of Postoperative Skull Defect on Brain Ct

Huang

Liao

Xiao

et al. 2013

Biomed. Eng. Appl. Basis Commun.

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The volume of the skull defect should be one of the most important quantitative measures for decompressive craniectomy. However, there has been no study focusing on automated estimation of the volume from postoperative computed tomography (CT). This study develops and validates three methods that can automatically locate, recover and measure the missing skull region based on symmetry without preoperative images. The low resolution estimate (LRE) method involves downsizing CT images,¯nding the axis of symmetry for each slice, and estimating the location and size of the missing skull regions. The intact mid-sagittal plane (i MSP) can be de¯ned either by dimension-bydimension (DBD) method as a global symmetry plane or by Liu's method as a regression from each slices. The skull defect volume can then be calculated by skull volume di®erence (SVD) with respect to each i MSP. During a 48-month period between July 2006 and June 2010 at a regional hospital in northern Taiwan, we collected 30 sets of nonvolumetric CT images after craniectomies. Three board-certi¯ed neurosurgeons perform computer-assisted volumetric analysis of skull defect volume V Man as the gold standard for evaluating the performance of our algorithm. We compare the error of the three volumetry methods. The error of V LRE is smaller than that of V Liu (p < 0:0001) and V DBD (p ¼ 0:034). The error of V DBD is signi¯cant smaller than that of V Liu (p ¼ 0:001). The correlation coe±cients between V Man and V LRE , V Liu , V DBD are 0.98, 0.88 and 0.95, respectively. In conclusion, these methods can help to de¯ne the skull defect volume in postoperative images and provide information of the immediate volume gain after decompressive craniectomies. The i MSP of the postoperative skull can be reliably identi¯ed using the DBD method.

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Section: Discussionmentioning

confidence: 99%

“…28,29 Results generated by geometric methods described in previous paragraph still require considerable editing prior to manufacturing the skull prosthesis. 24 Our totally automatic methods may be applied at the image processing stage to generate the iMSP and the LRE, which can be used as initial values prior to the manual editing process.…”

Section: Discussionmentioning

confidence: 99%

Automated Volumetry of Postoperative Skull Defect on Brain Ct

Huang

Liao

Xiao

et al. 2013

Biomed. Eng. Appl. Basis Commun.

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“…Ultimately, the accuracy of the virtual reconstruction is dependent on the imaging resolution, as the data between imaging slices must be interpolated [6,7]. At present, CT scanning is the most commonly used modality for several reasons.…”

Section: Modeling Techniquesmentioning

confidence: 99%

Adjunctive use of medical modeling for head and neck reconstruction

Zenga¹,

Nussenbaum²

2013

Current Opinion in Otolaryngology & Head and Neck Surgery

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Although the surgeon should be aware of the possibility of imprecision, three-dimensional modeling has been shown to be accurate and affordable. The added expense may even be regained by the resulting decrease in OR time and the need for secondary procedures. Patients should be selected carefully and the decision to use three-dimensional modeling needs to balance the complexity of the case with timing and feasibility of model production. Recent innovations in rapid prototyping, including improved model biocompatibility and patient-specific tissue engineering, may improve patient outcomes and expand model applications in the future.

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“…16 A surface model created by these patches interpolated the outer cortical surface at the gap. External callus was defined as the callus outside this surface.…”

Section: Lipus Treatmentmentioning

confidence: 99%

Effect of low-intensity pulsed ultrasound stimulation on callus remodelling in a gap-healing model

Tobita

Ohnishi

Matsumoto

et al. 2011

The Journal of Bone and Joint Surgery. British volume

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We evaluated the effect of low-intensity pulsed ultrasound stimulation (LIPUS) on the remodelling of callus in a rabbit gap-healing model by bone morphometric analyses using three-dimensional quantitative micro-CT. A tibial osteotomy with a 2 mm gap was immobilised by rigid external fixation and LIPUS was applied using active translucent devices. A control group had sham inactive transducers applied. A region of interest of micro-CT was set at the centre of the osteotomy gap with a width of 1 mm. The morphometric parameters used for evaluation were the volume of mineralised callus (BV) and the volumetric bone mineral density of mineralised tissue (mBMD). The whole region of interest was measured and subdivided into three zones as follows: the periosteal callus zone (external), the medullary callus zone (endosteal) and the cortical gap zone (intercortical). The BV and mBMD were measured for each zone. In the endosteal area, there was a significant increase in the density of newly formed callus which was subsequently diminished by bone resorption that overwhelmed bone formation in this area as the intramedullary canal was restored. In the intercortical area, LIPUS was considered to enhance bone formation throughout the period of observation. These findings indicate that LIPUS could shorten the time required for remodelling and enhance the mineralisation of callus.

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Automatic Hole Repairing for Cranioplasty Using Bézier Surface Approximation

Cited by 5 publications

References 9 publications

Automated Volumetry of Postoperative Skull Defect on Brain Ct

Automated Volumetry of Postoperative Skull Defect on Brain Ct

Adjunctive use of medical modeling for head and neck reconstruction

Effect of low-intensity pulsed ultrasound stimulation on callus remodelling in a gap-healing model

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