Automatic dental arch detection and panoramic image synthesis from CT images

Sa-ing, Vera; Wangkaoom, Kongyot; Thongvigitmanee, Saowapak S.

doi:10.1109/embc.2013.6610944

Cited by 14 publications

(10 citation statements)

References 2 publications

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“…Initially grape cultivation relied on both seed and vegetative propagation and was influenced by religion, regional traditions and human migration [18,20]. Seeds may have been the more common means of propagation early in the cultivation of grapes as they were easier to transport over large distances and intentional and unintentional crosses generated great diversity within the cultivated types [21]. …”

Section: Introductionmentioning

confidence: 99%

Identification of mildew resistance in wild and cultivated Central Asian grape germplasm

et al. 2013

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BackgroundCultivated grapevines, Vitis vinifera subsp. sativa, evolved from their wild relative, V. vinifera subsp. sylvestris. They were domesticated in Central Asia in the absence of the powdery mildew fungus, Erysiphe necator, which is thought to have originated in North America. However, powdery mildew resistance has previously been discovered in two Central Asian cultivars and in Chinese Vitis species.ResultsA set of 380 unique genotypes were evaluated with data generated from 34 simple sequence repeat (SSR) markers. The set included 306 V. vinifera cultivars, 40 accessions of V. vinifera subsp. sylvestris, and 34 accessions of Vitis species from northern Pakistan, Afghanistan and China. Based on the presence of four SSR alleles previously identified as linked to the powdery mildew resistance locus, Ren1, 10 new mildew resistant genotypes were identified in the test set: eight were V. vinifera cultivars and two were V. vinifera subsp. sylvestris based on flower and seed morphology. Sequence comparison of a 620 bp region that includes the Ren1-linked allele (143 bp) of the co-segregating SSR marker SC8-0071-014, revealed that the ten newly identified genotypes have sequences that are essentially identical to the previously identified mildew resistant V. vinifera cultivars: ‘Kishmish vatkana’ and ‘Karadzhandal’. Kinship analysis determined that three of the newly identified powdery mildew resistant accessions had a relationship with ‘Kishmish vatkana’ and ‘Karadzhandal’, and that six were not related to any other accession in this study set. Clustering procedures assigned accessions into three groups: 1) Chinese species; 2) a mixed group of cultivated and wild V. vinifera; and 3) table grape cultivars, including nine of the powdery mildew resistant accessions. Gene flow was detected among the groups.ConclusionsThis study provides evidence that powdery mildew resistance is present in V. vinifera subsp. sylvestris, the dioecious wild progenitor of the cultivated grape. Four first-degree parent progeny relationships were discovered among the hermaphroditic powdery mildew resistant cultivars, supporting the existence of intentional grape breeding efforts. Although several Chinese grape species are resistant to powdery mildew, no direct genetic link to the resistance found in V. vinifera could be established.

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Section: Introductionmentioning

confidence: 99%

Identification of mildew resistance in wild and cultivated Central Asian grape germplasm

et al. 2013

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“…The attenuation is because of the X‐ray beam absorption and scattering by incident human tissues. A current research trend is focalised on the development of automatic or semi‐automatic methodologies for synthesising panoramic radiographs by unwrapping CT‐scan volumetric data . These synthesised panoramic radiographs are often used in clinical treatments because they exhibit reduced blurring, geometric distortion and overlapping of other dental structures.…”

Section: The Anatomy‐driven Segmentation Methodologymentioning

confidence: 99%

CT segmentation of dental shapes by anatomy‐driven reformation imaging and B‐spline modelling

Barone

Paoli

Razionale

2015

Numer Methods Biomed Eng

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Dedicated imaging methods are among the most important tools of modern computer-aided medical applications. In the last few years, cone beam computed tomography (CBCT) has gained popularity in digital dentistry for 3D imaging of jawbones and teeth. However, the anatomy of a maxillofacial region complicates the assessment of tooth geometry and anatomical location when using standard orthogonal views of the CT data set. In particular, a tooth is defined by a sub-region, which cannot be easily separated from surrounding tissues by only considering pixel grey-intensity values. For this reason, an image enhancement is usually necessary in order to properly segment tooth geometries. In this paper, an anatomy-driven methodology to reconstruct individual 3D tooth anatomies by processing CBCT data is presented. The main concept is to generate a small set of multi-planar reformation images along significant views for each target tooth, driven by the individual anatomical geometry of a specific patient. The reformation images greatly enhance the clearness of the target tooth contours. A set of meaningful 2D tooth contours is extracted and used to automatically model the overall 3D tooth shape through a B-spline representation. The effectiveness of the methodology has been verified by comparing some anatomy-driven reconstructions of anterior and premolar teeth with those obtained by using standard tooth segmentation tools. Copyright © 2015 John Wiley & Sons, Ltd.

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“…Sa-ing et al ( 2013 ) proposed a fast algorithm for automatic detection of the dental arch. A sequence of synthetic panoramic images and a ray-sum panoramic image were also generated.…”

Section: Introductionmentioning

confidence: 99%

Reconstruction of Panoramic Dental Images Through Bézier Function Optimization

Amorim

Moraes

Silva

et al. 2020

Front. Bioeng. Biotechnol.

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Computed tomography (CT) and X-ray images have been extensively used as a valuable diagnostic tool in dentistry for surgical planning and treatment. Nowadays, dental cone beam CT has been extensively used in dental clinics. Therefore, it is possible to employ three-dimensional (3D) data from the CT to reconstruct a two-dimensional (2D) panoramic dental image that provides a longitudinal view of the mandibular region of the patient, avoiding an additional exposure to X-ray. In this work, we developed a new automatic method for reconstructing 2D panoramic images of the dental arch based on 3D CT images, using Bézier curves and optimization techniques. The proposed method was applied to five patients, some of them with missing teeth, and smooth panoramic images with good contrast were obtained.

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Automatic dental arch detection and panoramic image synthesis from CT images

Cited by 14 publications

References 2 publications

Identification of mildew resistance in wild and cultivated Central Asian grape germplasm

Identification of mildew resistance in wild and cultivated Central Asian grape germplasm

CT segmentation of dental shapes by anatomy‐driven reformation imaging and B‐spline modelling

Reconstruction of Panoramic Dental Images Through Bézier Function Optimization

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