Image qualityvsradiation dose of four cone beam computed tomography scanners

Abstract

The best radiation dose vs image quality was found for the i-CAT.

Development and applicability of a quality control phantom for dental cone‐beam CT

“…However, it can be clear that the voxel size itself provides only a crude prediction of the spatial accuracy. ( 2 , 16 ) The voxel size, determined by the manufacturer, should ideally provide a balance between spatial resolution and noise. It is seen that for some devices, predefined exposure protocols using different mAs values are reconstructed at different voxel sizes.…”

“…( 1 , 2 ) Three different aspects have to be considered in the optimization of an X‐ray imaging modality: quantification of the radiation dose and risk for patients, assessment of technical image quality, and assessment of diagnostic image quality. By means of an appropriate test object, the first and second aspect can be studied in one investigation process.…”

“…To develop such a tool, all available knowledge regarding image quality assessment on other 3D or pseudo‐3D imaging modalities (e.g., spiral CT, tomosynthesis, kV‐CBCT used in radiotherapy) ( 4 – 7 ) needs to be combined with the existing knowledge of CBCT and previous studies on CBCT image quality. ( 2 , 8 – 16 ) Even though a large number of CBCT image quality studies have been published over the last few years, most have focused on diagnostic image quality. However, a number of studies have already assessed technical image quality for one or more CBCT devices, using an existing commercial quality control (QC) phantom, ( 8 , 9 ) a phantom provided by a CBCT manufacturer, ( 2 , 10 ) a water phantom, ( 8 , 11 ) a customized test object, ( 12 – 15 ) or clinical data.…”

“…( 2 , 8 – 16 ) Even though a large number of CBCT image quality studies have been published over the last few years, most have focused on diagnostic image quality. However, a number of studies have already assessed technical image quality for one or more CBCT devices, using an existing commercial quality control (QC) phantom, ( 8 , 9 ) a phantom provided by a CBCT manufacturer, ( 2 , 10 ) a water phantom, ( 8 , 11 ) a customized test object, ( 12 – 15 ) or clinical data. ( 16 , 17 ) Although these studies have provided useful insights regarding certain image quality aspects, they also show the need for a standardized QC phantom that is suited for use on all CBCT devices, and which provides results that are relevant to dental imaging and that can be compared between systems.…”

Acurácia de medidas lineares em softwares de planejamento de implantes sobre imagens de mandibulas atróficas obtidas por tomografias computadorizadas de feixe cônico com diferentes protocolos de aquisição

“…O estudo atual confirma os resultados anteriores que demonstraram alta precisão de imagens obtidas com TCFC por meio de medidas lineares (Kobayshi et al, 2004;Lascala et al, 2004;Ludlow et al, 2007;Suomalainen et al, 2008;Loubele et al, 2008;Periago et al, 2008;Stratemann et al, 2008;Hassan et al, 2009;Lund et al, 2009;Brown et al, 2009;Damstra et al, 2010;Maloney et al, 2011;El-Beialy et al, 2011;Tomasi et al, 2011;Panzarella et al, 2011;Al-Ekrish, Ekran 2011;Timock et al, 2011;Engelbrecht et al, 2013;Waltrick et al, 2013;Kosalagood et al, 2014). Contribuindo para a consolidação da precisão das imagens de TCFC, análises geométricas das medidas também foram analisadas em alguns estudos (Marmulla et al, 2005;Baltrick et al, 2008;Primo et al, 2012) obtendo significativos resultados.…”