Artefacts in CBCT: a review

Schulze, Ralf; Heil, Ulrich; Grob, Dagmar; Bruellmann, DD; Dranischnikow, E; Schwanecke, Ulrich; Schoemer, Elmar

doi:10.1259/dmfr/30642039

Cited by 838 publications

(833 citation statements)

References 43 publications

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“…15,16 Utilizing high-resolution scan modes increases spatial resolution while increasing image noise at very thin slice thicknesses, and it additionally exacerbates the influence of metal streak artefacts in the image and therefore could result in a poor image. 17 Several reconstruction algorithms and techniques are currently under investigation and have been partially implemented by several manufacturers to improve image quality at low scan modes.…”

Section: Discussionmentioning

confidence: 99%

Influence of scan setting selections on root canal visibility with cone beam CT

Hassan

Payam²,

Juyanda³

et al. 2012

Dentomaxillofacial Radiology

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Objectives: The aim of this study was to assess the influence of scan setting selection, including field of view (FOV) ranging from small to large, number of projections and scan modes on the visibility of the root canal with cone beam CT (CBCT). Methods: One human mandible cadaver was scanned with CBCT (Accuitomo 170; J Morita MPG Corp., Kyoto, Japan) using six different FOVs (464 cm, 666 cm, 868 cm, 10610 cm, 14610 cm and 17612 cm) with either 360 or 180 projections in standard and high resolution. The right canine was selected for evaluation. Ten observers independently assessed the visibility of the canal space and overall image quality on a five-point scale.Results: The results indicate that both selections of FOV and number of projections have significant influence on root canal visibility (p 5 0.0001), whereas scan mode, whether standard or high resolution, was less relevant (p 5 0.34). Conclusions: The smallest FOV available should always be used for endodontic applications, and it is not recommended to reduce the number of projections to 180. Using the standard scan mode instead of high resolution does not negatively influence the visibility of the root canal space and is therefore recommended.

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Section: Discussionmentioning

confidence: 99%

Influence of scan setting selections on root canal visibility with cone beam CT

Hassan

Payam²,

Juyanda³

et al. 2012

Dentomaxillofacial Radiology

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“…11 Hasta hareketleri, her bir imaj çok kısa süre-lerde elde edildiği için bütün imajlarda büyük keskinlik problemi oluşturmayabilir. Fakat değişik derecelerde bulanıklıklar oluşturarak imaj rekonsrüksiyonunu direkt olarak etkiler.…”

Section: Hasta İle İlgi̇li̇ Artefaktlarunclassified

“…Küçük voksel seçimi bu durumun etkisini azaltabilir. 8,11,13 4.2. Eksik örnekleme(Undersampling): İmaj rekonstrüksiyonu için az sayıda temel projeksiyon oluşturulduğunda bu artefakt meydana gelir.…”

Section: Koni̇k Işin İle İlgi̇li̇ Artefaktlarunclassified

“…Klinik olarak incelenecek bölgeyi x-ışını hüzmesinin horizontal planında konumlandırma ve xışını hüzmesinin uygun bir FOV alanı kullanarak kolimasyonu ile bu durum azaltılabilir. 8,11,13 SONUÇ KIBT görüntülerinde gerek hastadan gerekse cihazdan kaynaklanabilecek artefaktlar iyi bilinmelidir. Aksi takdirde hekimin yanlış tanılara yönelmesi ile gereksiz tetkik ve tedavi yapma riski artarak hastanın tedavisi gecikebilir, tedavi maliyeti yükselebilir ve yeni radyografik görüntülere ihtiyaç duyularak hastaya verilen radyasyon miktarı da artabilir.…”

Section: Koni̇k Işin İle İlgi̇li̇ Artefaktlarunclassified

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Konik Işinli Bilgisayarli Tomografide Artefakt Çeşitleri Ve Nedenleri

Kalabalık¹,

Ertaş²

2015

Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi

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“…For the PMMA section, it can be seen that the cupping artefact is quite strong, with .50% decrease in voxel value from the periphery to the centre of the FOV. This artefact is mainly owing to scatter and the beam hardening effect [18]. The bowtie filtration limits such artefact and flattens the profile, lowering peripheral voxel values by ;25% and raising voxel values in the inner half by ;10%.…”

Section: Image Qualitymentioning

confidence: 99%

Bowtie filtration for dedicated cone beam CT of the head and neck: a simulation study

Zhang

Marshall²,

Jacobs³

et al. 2013

BJR

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Objective: To investigate the influence of bowtie filtration on dedicated cone beam CT (CBCT) of the head and neck. Methods: A validated hybrid simulation technique was used to model a commercial CBCT system with offset scanning geometry, 90 kV tube potential and 145375 mm imaging field of view. Three bowtie filters were formulated to produce uniform flux intensity in the projection image of cylindrical objects of diameter 14, 16 and 18 cm. The influence of these simulated filters was compared with the original flat filtration in terms of the output radiation field, the dose delivered to the object, the scatter distribution in projections and the quality of the reconstructed image. Results: Compared against flat filtration, dose reduction for the bowtie case, examined as a function of radial distance within a 16-cm-diameter water cylinder, varied from 8.7% at the centre to 53.8% at the periphery. Scatter reduction, quantified using scatter-to-primary ratio in projection images, was up to 37.6% for a 14-cm-diameter cylindrical contrast phantom. Using the supplied routine image reconstruction, bowtie filtration resulted in comparable noise appearance, contrast resolution and artefact pattern for computational anatomical phantoms, with ,5% difference in contrast-to-noise ratio. Conclusion: Bowtie filtration can effectively reduce the dose and scatter in CBCT of the head and neck. For better image quality, corresponding modification to the image pre-processing and reconstruction is needed. Advances in knowledge: The hybrid simulation approach can usefully explore the impact of proposed system component and design changes.

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Artefacts in CBCT: a review

Cited by 838 publications

References 43 publications

Influence of scan setting selections on root canal visibility with cone beam CT

Influence of scan setting selections on root canal visibility with cone beam CT

Konik Işinli Bilgisayarli Tomografide Artefakt Çeşitleri Ve Nedenleri

Bowtie filtration for dedicated cone beam CT of the head and neck: a simulation study

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