Fractal Analysis of Trabecular Patterns in Projection Radiographs

Chen, Ji; Zheng, Bin; Chang, Yuan; Shaw, Chris C.; Towers, Jeffrey D.; Gur, David

doi:10.1097/00004424-199406000-00005

Cited by 47 publications

(24 citation statements)

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“…We believe that this study establishes the potential of TACT to quantify healing in osseous defects, thus providing alternatives to QCT and other advanced imaging methods [9,10,11,12,13,14,15,18,19,20,21]. The TACT technique does not require expensive equipment and can be easily employed in routine clinical and laboratory settings without having to standardize or maintain rigid projection geometry.…”

Section: Discussionmentioning

confidence: 68%

“…The higher the fractal dimension, the more the morphological complexity at the ultra-structural level [2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18]. Analyses of fractal dimension has been correlated with the strength of bone in previous studies [5,6,7,14,15,16,18], and therefore we decided to evaluate the fractal dimension of healing sites on rabbit mandibles which were subject to destructive bony lesion induction and various treatment modalities, using tuned aperture computed tomography (TACT; OrthoTACT, Instrumentarium Imaging, Helsinki, Finland) images.…”

Section: Introductionmentioning

confidence: 99%

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Fractal analyses of osseous healing using Tuned Aperture Computed Tomography images

et al. 2001

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The aim of this study was to evaluate osseous healing in mandibular defects using fractal analyses on conventional radiographs and tuned aperture computed tomography (TACT; OrthoTACT, Instrumentarium Imaging, Helsinki, Finland) images. Eighty test sites on the inferior margins of rabbit mandibles were subject to lesion induction and treated with one of the following: no treatment (controls); osteoblasts only; polymer matrix only; or osteoblast-polymer matrix (OPM) combination. Images were acquired using conventional radiography and TACT, including unprocessed TACT (TACT-U) and iteratively restored TACT (TACT-IR). Healing was followed up over time and images acquired at 3, 6, 9, and 12 weeks post-surgery. Fractal dimension (FD) was computed within regions of interest in the defects using the TACT workbench. Results were analyzed for effects produced by imaging modality, treatment modality, time after surgery and lesion location. Histomorphometric data were available to assess ground truth. Significant differences (p < 0.0001) were noted based on imaging modality with TACT-IR recording the highest mean fractal dimension (MFD), followed by TACT-U and conventional images, in that order. Sites treated with OPM recorded the highest MFDs among all treatment modalities (p < 0.0001). The highest MFD based on time was recorded at 3 weeks and differed significantly with 12 weeks (p < 0.035). Correlation of FD with results of histomorphometric data was high (r = 0.79; p < 0.001). The FD computed on TACT-IR showed the highest correlation with histomorphometric data, thus establishing the fact TACT is a more efficient and accurate imaging modality for quantification of osseous changes within healing bony defects.

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Section: Discussionmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Fractal analyses of osseous healing using Tuned Aperture Computed Tomography images

et al. 2001

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“…Fraktal boyut, geometrik yapının karmaşıklığını temsil etmektedir ve yapılan çalışmalar bu nümerik değerin artışının yapının daha kompleks (karmaşık) olduğuna işaret ettiğini ortaya koymaktadır. 53,57 Tıp radyologları, fraktal analiz yönteminin kemikte erken dönemde meydana gelen değişikliklerin saptanmasına yardımcı olan bir yöntem olduğunu bildirmekte ve bu yöntemin ışınlama geometrisi, açılandırma ve radyodensite gibi değişkenlerden bağımsız bir yöntem olduğunu iddia etmektedir. [58][59][60] Alveol kemiğinin trabeküler ağı, fraktal boyutlarla karakterize edilebilen bir yapı sergiler.…”

Section: Fraktal Analiz Yöntemiunclassified

IMAGING SYSTEMS USED FOR DIAGNOSIS OF PERIODONTAL PATHOLOGY Part 2: Alternative Imaging Systems and Image Processing Methods

Soğur¹,

Baksı²

2014

EÜ Dişhek Fak Derg

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ÖzetRadyografiler, periodontal hastalıkların tanı ve tedavisinde kullanılan en önemli gereçlerdir. Periodontal dokuların değerlendirilmesinde rutinde kullanılan iki boyutlu görüntüleme sistemleri, alveoler kemikte ortaya çıkan erken dönem değişikliklerin saptanmasında yetersiz kalmaktadır. Her ne kadar, üç boyutlu görüntü oluşturan Bilgisayarlı Tomografi (BT) ve Konik Işınlı Bilgisayarlı Tomografi (CBCT) gibi görüntüleme sistemleri kemik defektlerinin 3 boyutlu olarak değerlendirme imkanını bize sunsa da, maliyetlerinin yüksek olması ve hastaya ulaşan radyasyon dozunun konvansiyonel filmlere oranla daha yüksek olması gibi önemli dezavantajları vardır. Tuned aperture computed tomography (TACT) görüntüleme sistemi ya da Optik Coherence Tomografi (OCT) gibi alternatif görüntüleme sistemlerinin periodontitise bağlı olarak kemikte meydana gelen değişikliklerin saptanmasına yönelik yapılan çalışmalar umut vaad etmektedir. Bunun yanı sıra, kemikte meydana gelen değişikliklerin saptanması aşamasında görüntü analiz yöntemlernn kullanımı, minör seviyedeki oluşan densite değişikliklerin bile kalitatif ve kantitatif olarak gözlemleyebilmemizi kolaylaştırmaktadır. Bu derlemenin amacı; periodontitise bağlı olarak alveoler kemikte meydana gelen değişikliklerin erken dönemde saptanmasında kullanılan alternatif görüntüleme ve analiz yöntemlerini değerlendirmektir.Anahtar Kelimeler: Dijital radyografi, dental, görüntü analiz yöntemleri, periodontoloji Abstract Radiographs are the most accurate diagnostic aid available in the diagnosis and treatment of periodontal disease. 2 dimensional (2-D) systems imaging systems used routinely in periodontology are not effective to detect the early bone changes according to the periodontal disease. Even though 3-D systems available such as Computed Tomography (CT) and Cone Beam Computed Tomography (CBCT ) has become a valuable imaging modality in periodontology to determine a three-dimensional (3D) architecture of osseous defects

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“…This quantitative method measures complex geometric structures that exhibits self-symmetry throughout the image [32,33]. The complexity of the structure is represented by the fractal dimension; with its increasing number the complexity increases [34]. There are many methods of fractal analysis.…”

Section: Introductionmentioning

confidence: 99%

“…Fractal dimension has been shown to distinguish patients with gingivitis and periodontitis [42] and those with and without osteoporosis [25] and has been used for assessment of dental implant sites [43]. A method of computing fractals based on Fourier's two-dimensional power spectrum was used in cases when crucial information about the degree of structural systematicity depended on the direction and size of the structures analysed [34,[44][45][46].…”

Section: Introductionmentioning

confidence: 99%

Using fractal dimension to evaluate alveolar bone defects treated with various bone substitute materials

Kozakiewicz

Chaberek²,

Bogusiak

2013

Open Medicine

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Fractal Analysis of Trabecular Patterns in Projection Radiographs

Cited by 47 publications

References 0 publications

Fractal analyses of osseous healing using Tuned Aperture Computed Tomography images

Fractal analyses of osseous healing using Tuned Aperture Computed Tomography images

IMAGING SYSTEMS USED FOR DIAGNOSIS OF PERIODONTAL PATHOLOGY Part 2: Alternative Imaging Systems and Image Processing Methods

Using fractal dimension to evaluate alveolar bone defects treated with various bone substitute materials

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