Evaluation of The Frequency of Artifacts in CBCT Depending on The Different Size of Field of View

Abstract

ABSTRACT Objectives: Various artifacts can be encountered when examining Cone-beam computed tomography(CBCT) images. In recent years, no descriptive study has been conducted on CBCT artifacts in the literature. The aim of this study is to identify artifacts in CBCT images with different imaging fields (FOV) taken on the same device, to determine their frequency, and also to reveal artifacts that are little known in the literature. Materials and Methods: In the study, CBCT images of the Faculty of Dentistry between the years 2012-2021 were scanned retrospectively and a total of 359 Cone Beam Computed Tomography images with 50x55, 100x55, 100x90, 130x55, 130x90, 230x170, 230x270 imaging fields (FOV) in the database, which met the exclusion and inclusion criteria, were analyzed by three oral and maxillofacial radiology research assistants and the types of artifacts seen on these images were determined. The incidence of the identified artifact types in the specified imaging areas was evaluated. Results: When looking at all images, the most common errors, regardless of FOV, were inevitable artifacts. Aliasing and motion artifacts were seen at higher rates on CBCT images with a larger field of view. In addition, the ring artifact was encountered in CBCT images with high imaging fields such as 130x90, 230x170 and 230x270. Conclusion: To know the incidence and causes of artifacts in images; it will prevent the patient, the environment and the practitioner from receiving x-rays (radiation) unnecessarily, mixing these errors with different pathological conditions and repetition of the image.

Keywords

• cone-beam computed tomography
• artifacts
• FOV

KIBT’ta Karşılaşılabilen Artifaktların Farklı Görüntüleme Alanlarında Görülme Sıklığının Değerlendirilmesi

Abstract

Amaç: Konik ışınlı bilgisayarlı tomografi (KIBT) görüntüleri incelenirken çeşitli artefaktlarla karşılaşılabilir. Son yıllarda literatürde KIBT artefaktları ile ilgili tanımlayıcı bir çalışma yapılmamıştır. Bu çalışmanın amacı, aynı cihaz üzerinde çekilen farklı görüntüleme alanlarına (FOV) sahip KIBT görüntülerindeki artefaktları tespit etmek, sıklıklarını belirlemek ve ayrıca literatürde az bilinen artefaktları ortaya çıkarmaktır. Gereç ve Yöntem: Çalışmada 2012-2021 yılları arasında Diş Hekimliği Fakültesindeki KIBT görüntüleri geriye dönük olarak taranmış ve 50x55, 100x55, 100x90, 130x55, 130x90, 230x170, 230x270 görüntüleme alanlaına sahip toplam 359 Konik Işınlı Bilgisayarlı Tomografi görüntüsü alınmıştır. Dışlama ve dahil etme kriterlerine uygun veri tabanındaki KIBT görüntüleri üç oral ve maksillofasiyal radyoloji araştırma görevlisi tarafından incelendi ve bu görüntülerde görülen artefakt türleri belirlendi. Belirlenen görüntüleme alanlarında tanımlanan artefakt tiplerinin görülme sıklığı değerlendirildi. Bulgular: Tüm görüntülere bakıldığında, FOV'dan bağımsız olarak en yaygın hatalar kaçınılmaz artefaktlardı. Daha geniş görüş alanına sahip KIBT görüntülerinde aliasing ve hareket artefaktları daha yüksek oranlarda görüldü. Ayrıca 130x90, 230x170 ve 230x270 gibi yüksek görüntüleme alanlarına sahip KIBT görüntülerinde halka artefaktı ile karşılaşıldı. Sonuç: Görüntülerdeki artefaktların görülme sıklığını ve nedenlerini bilmek; hastanın, çevrenin ve uygulayıcının gereksiz yere röntgen (radyasyon) almasını, bu hataları farklı patolojik durumlarla karıştırmasını ve görüntünün tekrarını önleyecektir.

Keywords

• konik ışınlı bilgisayarlı tomografi
• artefaktlar
• FOV

References

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