Application of Fractal Analysis Method on Panoramic Radiographs and Effect of Different X-Ray Devices on Fractal Dimension Value

Abstract

İntroduction

The aim of this study was to investigate the effect of  different X-ray devices and exposure parameters on fractal analysis (FA)  of panoramic radiographs (PR) for the same region of interest (ROI)  of the same jaw.

Material and Methods

Fourty-five panoramic images taken with different X-ray devices and exposure parameters of fifteen dry sheep hemimandibles were used in this study. Fractal dimension analysis of trabecular bone was performed on the hemimandible by using the box-counting method. The results were statistically evaluated using the Paired t-test.

Results

For 57 kVp, 5 mA and 63 kVp, 6 mA exposure parameters and first X-ray device, the average FD value obtained from panoramic images of fifteen dry sheep hemimandibles  were 1,3551 and 1,3653. For the same exposure parameters and second X-ray device, the average FD value obtained from panoramic images of fifteen dry sheep hemimandibles  were 1,3632 and 1,3698. There was no statistically significant difference between the FD values of PRs taken with two different x-ray device (p = 0.552). There was no statistically significant difference between the FD values ​​of 1st and 2nd scanning of first device and the FD values ​​of 1st and 2nd scanning of second device (p = 0.164) (p = 0.587).

Conclusion

Although the FD values obtained from the same ROI on the PRs taken with different X-ray devices and tube voltage values of the same jaw were different, the small changes in FD values did not make a statistically significant difference in the results.

Keywords

• fractal analysis,panoramic radiography,mandible

Panoramik Radyografilerde Fraktal Analiz Metodunun Uygulanması ve Değişik Röntgen Cihazlarının Fraktal Boyut Değerine Etkisi

Abstract

Amaç:

Bu çalışmanın amacı aynı çenenin farklı röntgen cihazları ve çekim parametreleri ile elde edilen panoramik radyografileri (PR) üzerinde aynı ilgi bölgesi için yapılan fraktal analiz (FA) sonuçlarına cihazların ve teknik faktörlerin etkisini incelemektir.

Gereç ve Yöntemler:

Bu çalışmada, 15 adet koyun hemimandibulasının iki farklı röntgen cihazı ve değişik ekspozür parametreleri ile elde edilen 45 panoramik röntgen görüntüsü kullanıldı. ImageJ (National Institutes of Health, Bethesda, MD)  programı kullanılarak kutu sayma yöntemi ile panoramik görüntüler üzerinde mandibular trabeküler kemiğin fraktal boyut analizi yapıldı. Sonuçlar Paired t-testi kullanılarak istatistiksel olarak değerlendirildi.

Bulgular:

15 adet koyun hemimandibulasının 1. Panoramik röntgen cihazında 57 kVp, 5 mA ve 63 kVp, 6 mA parametreleri ile çekilen panoramik görüntülerinde elde edilen ortalama FB değeri 1,3551 ve 1,3653 idi. Yine aynı parametreler ile 2. cihazdan elde edilen ortalama FB ise 1,3632 ve 1,3698 idi. Her iki röntgen cihazı ile yapılan çekimlere ait FB değerleri arasında istatiksel olarak anlamlı bir fark yoktu (p=0,552). 1. Cihaz  ile yapılan 1. ve 2. çekimlere ait FB değerleri arasında ve 2. cihaz ile yapılan 1. ve 2. çekimlere ait FB değerleri arasında istatiksel olarak anlamlı bir fark yoktu (p=0,164) (p=0,587).

Sonuç:

Aynı çenenin farklı röntgen cihazı ve tüp voltaj değerleri ile çekilen PR’ları üzerinde aynı ilgi bölgesinden elde edilen FB değerleri farklı olmakla beraber, FB değerlerindeki küçük değişimler sonuçlarda  istatistiksel olarak anlamlı bir fark oluşturmamıştır.

Keywords

• fraktal analiz,panoramik radyografi,mandibula

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