Dental cone beam CT image quality possibly reduced by patient movement

Abstract

Patient artefacts in dental cone beam CT scans can happen for various reasons. These range from artefacts from metal restorations to movement. An audit was carried out in the Glasgow Dental Hospital analysing how many scans showed signs of "motion artefact", and then to assess if there was any correlation between patient age and movement artefacts. Specific age demographics were then analysed to see if these cohorts were at a higher risk of "movement artefacts". Dentomaxillofacial Radiology ( Keywords: hospital radiology departments; cone beam computed tomography Patient artefacts in dental cone beam CT (CBCT) scans can happen for various reasons. These range from artefacts from metal restorations to movement.

Movement characteristics in young patients and the impact on CBCT image quality

“…12 It is well known that patient motion artefacts influence the obtainable resolution of the final CBCT reconstructed image, rather than the resolution of the unit's flat panel detector. 12 Very few studies 13,14,16 in the literature have assessed the image quality and visual characteristics of CBCT examination for the presence of artefacts supposedly related to patient movement. These studies reported that between 4.5% and 41.5% of CBCT examinations show artefacts suggestive of patient movement.…”

“…These studies reported that between 4.5% and 41.5% of CBCT examinations show artefacts suggestive of patient movement. 13,14,16 But, although some studies 7,8 report on the possible impact of motion artefacts on image quality, knowledge of which types and magnitudes of movements may considerably hamper the diagnostic outcome of a CBCT examination is still a key question. 8 Moreover, it is unclear whether observed artefacts in some studies 13,14,16 were in fact due to patient motion.…”

“…[9][10][11][12] According to the literature, patient motion artefacts in CBCT imaging appear mainly as stripe-and ring-like patterns, double bony contours and overall unsharpness. [13][14][15] The impact of patient motion artefacts on the various diagnostic tasks performed based on CBCT imaging is yet unknown. 16,17 If patient motion artefacts are present in an image, leading to compromised image quality, a re-exposure of the patient may be necessary.…”

Konik Işinli Bilgisayarli Tomografide Artefakt Çeşitleri Ve Nedenleri

“…Donaldson ve arkadaşları 17 KIBT görüntülerinde hareket artefaktı oranını ve bu artefaklara bağlı tanısal yetersizlik nedeniyle yapılan çekim tekrarlarını belirlemek amacıyla yaptıkları retrospektif çalışmada; ilk çekimlerin % 95,5'inde hareket artefaktı görülmediğini bildirmişlerdir. Tüm çekimlerin % 99,5'inin çekim tekrarı gerektirmeyecek tanısal doğruluğa sahip olduğunu bildirmişlerdir.…”

“…16 yaş altı ve 65 yaş üzeri hastalarda çekim sırasında oluşan hareket artefaktlarında artış görüldüğünü belirtmişlerdir. 17 Spin-Neto ve arkadaşları 16 tam dişli bir insan kafatasına değişik hareketler vererek, KIBT ile görüntü elde ettikleri çalışmalarında; bütün hareket artefaktları arasında (çizgi şeklinde, çift konturlu, keskin olmayan (netsizlik) ve halka şeklinde artefaktlar), en fazla çizgi şeklinde artefaktların görüldüğünü bildirmişlerdir. Mental foramen, infraorbital foramen ve supraorbital foramen seviyelerinde oluşan artefaklar dikkate alındığında en fazla artefaktın mental foramen seviyesinde görüldüğünü belirtmişlerdir.…”