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Clinical Oral Investigations

Erschienen in:

01.10.2012 | Original Article

Image resolution and exposure time of digital radiographs affects fractal dimension of periapical bone

verfasst von: B. Güniz Baksi, Aleš Fidler

Erschienen in: Clinical Oral Investigations | Ausgabe 5/2012

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Abstract

Objectives

The aim of this study was to evaluate the effect of exposure time and image resolution on fractal dimension (FD) of periapical bone on images obtained using a storage phosphor plate (SPP) system.

Materials and methods

Periapical images of premolar and molar teeth on both sides of ten dry human mandibles were obtained with Digora Optime (Soredex Corp., Helsinki, Finland) SPP system. The SPPs were exposed with three exposure times (0.05, 0.12, and 0.30 s) and scanned immediately after exposure with high and super resolutions. FD was calculated using public domain software (ImageJ with FracLac plug-in) on two non-overlapping region of interest (ROIs) on premolar and molar periapical bone areas of each radiograph using differential box-counting method. The ROIs on corresponding images were of the same size and position. FDs were compared using two-way ANOVA and Tukey–Kramer multiple comparison tests (p = 0.05).

Results

Images obtained with super resolution scans gave significantly higher FD values compared to high-resolution scanning for all exposures (p < 0.0001). FD values were decreasing with increase in exposure time for both resolutions (p < 0.0001). The highest FD was found for images with super resolution and shortest exposure time, which exhibited the highest noise.

Conclusions

FD analysis seems not so robust method as it was believed previously. It shows significant changes with image resolution and exposure time.

Clinical relevance

Exposure time and scanning resolution of SPPs should be carefully chosen when evaluating the change in FD of alveolar bone for various bone disorders.

Geraets WG, van der Stelt PF (2000) Fractal properties of bone. Dentomaxillofac Radiol 29:144–153PubMedCrossRef

Shrout MK, Potter BJ, Hildebolt CF (1997) The effect of image variations on fractal dimension calculations. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 84:96–100PubMedCrossRef

Wilding RJ, Slabbert JC, Kathree H, Owen CP, Crombie K, Delport P (1995) The use of fractal analysis to reveal remodelling in human alveolar bone following the placement of dental implants. Arch Oral Biol 40:61–72PubMedCrossRef

Yu YY, Chen H, Lin CH, Chen CM, Oviir T, Chen SK, Hollender L (2009) Fractal dimension analysis of periapical reactive bone in response to root canal treatment. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 107:283–288PubMedCrossRef

White SC, Rudolph DJ (1999) Alterations of the trabecular pattern of the jaws in patients with osteoporosis. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 88:628–635PubMedCrossRef

White SC, Cohen JM, Mourshed FA (2000) Digital analysis of trabecular pattern in jaws of patients with sickle cell anemia. Dentomaxillofac Radiol 29:119–124PubMedCrossRef

Ruttimann UE, Webber RL, Hazelrig JB (1992) Fractal dimension from radiographs of peridental alveolar bone. A possible diagnostic indicator of osteoporosis. Oral Surg Oral Med Oral Pathol 74:98–110PubMedCrossRef

Shrout MK, Hildebolt CF, Potter BJ (1997) The effect of varying the region of interest on calculations of fractal index. Dentomaxillofac Radiol 26:295–298PubMedCrossRef

Shrout MK, Farley BA, Patt SM, Potter BJ, Hildebolt CF, Pilgram TK, Yokoyama-Crothers N, Dotson M, Hauser J, Cohen S, Kardaris E, Hanes P (1999) The effect of region of interest variations on morphologic operations data and gray-level values extracted from digitized dental radiographs. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 88:636–639PubMedCrossRef

10.

Chen SK, Chen CM (1998) The effects of projection geometry and trabecular texture on estimated fractal dimensions in two alveolar bone models. Dentomaxillofac Radiol 27:270–274PubMedCrossRef

11.

Bollen AM, Taguchi A, Hujoel PP, Hollender LG (2001) Fractal dimension on dental radiographs. Dentomaxillofac Radiol 30:270–275PubMedCrossRef

12.

Pornprasertsuk S, Ludlow JB, Webber RL, Tyndall DA, Yamauchi M (2001) Analysis of fractal dimensions of rat bones from film and digital images. Dentomaxillofac Radiol 30:179–183PubMedCrossRef

13.

Jolley L, Majumdar S, Kapila S (2006) Technical factors in fractal analysis of periapical radiographs. Dentomaxillofac Radiol 35:393–397PubMedCrossRef

14.

Attaelmanan AG, Borg E, Grondahl HG (2001) Signal-to-noise ratios of 6 intraoral digital sensors. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 91:611–615PubMedCrossRef

15.

Li G, Berkhout WE, Sanderink GC, Martins M, van der Stelt PF (2008) Detection of in vitro proximal caries in storage phosphor plate radiographs scanned with different resolutions. Dentomaxillofac Radiol 37:325–329PubMedCrossRef

16.

Al-Kadi OS (2010) Assessment of texture measures susceptibility to noise in conventional and contrast enhanced computed tomography lung tumour images. Comput Med Imaging Graph 34:494–503PubMedCrossRef

17.

Veenland JF, Grashuis JL, Gelsema ES (1998) Texture analysis in radiographs: the influence of modulation transfer function and noise on the discriminative ability of texture features. Med Phys 25:922–936PubMedCrossRef

18.

Wenzel A, Haiter-Neto F, Gotfredsen E (2007) Influence of spatial resolution and bit depth on detection of small caries lesions with digital receptors. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 103:418–422PubMedCrossRef

19.

Sarkar N, Chaudhuri BB (1994) An efficient differential box-counting approach to compute fractal dimension of image. IEEE Transactions on Systems, Man, and Cybernetic 24:115–120CrossRef

20.

Hildebolt CF, Bartlett TQ, Brunsden BS, Hente NL, Gravier MJ, Walkup RK, Shrout MK, Vannier MW (1994) Bitewing-based alveolar bone densitometry: digital imaging resolution requirements. Dentomaxillofac Radiol 23:129–134PubMed

21.

Borg E, Attaelmanan A, Grondahl HG (2000) Image plate systems differ in physical performance. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 89:118–124PubMedCrossRef

22.

Couture RA (2003) Comments on noise and resolution of the DenOptix radiography system. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 95:746–751PubMedCrossRef

23.

Pfeiffer P, Schmage P, Nergiz I, Platzer U (2000) Effects of different exposure values on diagnostic accuracy of digital images. Quintessence Int 31:257–260PubMed

24.

Berkhout E, Sanderink G, van der Stelt P (2004) Digital intra-oral radiography in dentistry. Diagnostic efficacy and dose considerations. Oral Radiology 19:1–13CrossRef

25.

Liu S (2008) An improved differential box-counting approach to compute fractal dimension of gray-level image. In: Yu F, Yue G, Chen Z, Zhang J (eds), vol 1. pp 303–306.

26.

Chikui T, Tokumori K, Yoshiura K, Oobu K, Nakamura S, Nakamura K (2005) Sonographic texture characterization of salivary gland tumors by fractal analyses. Ultrasound Med Biol 31:1297–1304PubMedCrossRef

Titel: Image resolution and exposure time of digital radiographs affects fractal dimension of periapical bone
verfasst von: B. Güniz Baksi
Aleš Fidler
Publikationsdatum: 01.10.2012
Verlag: Springer-Verlag
Erschienen in: Clinical Oral Investigations / Ausgabe 5/2012
Print ISSN: 1432-6981
Elektronische ISSN: 1436-3771
DOI: https://doi.org/10.1007/s00784-011-0639-3

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Image resolution and exposure time of digital radiographs affects fractal dimension of periapical bone

Abstract

Objectives

Materials and methods

Results

Conclusions

Clinical relevance

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Objectives

Materials and methods

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Conclusions

Clinical relevance

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