Quantitative assessment of image artifacts from root filling materials on CBCT scans made using several exposure parameters

다국어 초록 (Multilingual Abstract)

Purpose: To quantify artifacts from different root filling materials in cone-beam computed tomography (CBCT) images acquired using different exposure parameters.
Materials and Methods: Fifteen single-rooted teeth were scanned using 8 different exposure protocols with 3 different filling materials and once without filling material as a control group. Artifact quantification was performed by a trained observer who made measurements in the central axial slice of all acquired images in a fixed region of interest using ImageJ. Hyperdense artifacts, hypodense artifacts, and the remaining tooth area were identified, and the percentages of hyperdense and hypodense artifacts, remaining tooth area, and tooth area affected by the artifacts were calculated. Artifacts were analyzed qualitatively by 2 observers using the following scores: absence (0), moderate presence (1), and high presence (2) for hypodense halos, hypodense lines, and hyperdense lines. Two-way ANOVA and the post-hoc Tukey test were used for quantitative and qualitative artifact analysis. The Dunnet test was also used for qualitative analysis. The significance level was set at P<.05.
Results: There were no significant interactions among the exposure parameters in the quantitative or qualitative analysis. Significant differences were observed among the studied filling materials in all quantitative analyses. In the qualitative analyses, all materials differed from the control group in terms of hypodense and hyperdense lines (P<.05). Fiberglass posts did not differ statistically from the control group in terms of hypodense halos (P>.05).
Conclusion: Different exposure parameters did not affect the objective or subjective observations of artifacts in CBCT images; however, the filling materials used in endodontic restorations did affect both types of assessments.

참고문헌 (Reference)

1 Scarfe WC, "What is cone-beam CT and how does it work?" 52 : 707-730, 2008

2 Araki K, "The effect of surrounding conditions on pixel value of cone beam computed tomography" 24 : 862-865, 2013

3 Bryant JA, "Study of the scan uniformity from an i-CAT cone beam computed tomography dental imaging system" 37 : 365-374, 2008

4 Kamburoglu K, "Radiographic detection of artificially created horizontal root fracture using different cone beam CT units with small fields of view" 42 : 20120261-, 2013

5 Chindasombatjaroen J, "Quantitative analysis of metallic artefacts caused by dental metals: comparison of cone-beam and multi-detector row CT scanners" 27 : 114-120, 2011

6 Pauwels R, "Quantification of metal artifacts on cone beam computed tomography images" 24 (24): 94-99, 2013

7 de Rezende Barbosa GL, "Performance of an artefact reduction algorithm in the diagnosis of in vitro vertical root fracture in four different root filling conditions on CBCT images" 49 : 500-508, 2016

8 Schulze RK, "On cone-beam computed tomography artifacts induced by titanium implants" 21 : 100-107, 2010

9 van der Schaaf I, "Minimizing clip artifacts in multi CT angiography of clipped patients" 27 : 60-66, 2006

10 Bechara BB, "Metal artefact reduction with cone beam CT: an in vitro study" 41 : 248-253, 2012

11 Nardi C, "Metal and motion artifacts by cone beam computed tomography (CBCT) in dental and maxillofacial study" 120 : 618-626, 2015

12 Bezerra IS, "Influence of the artifact reduction algorithm of Picasso Trio CBCT system on the diagnosis of vertical root fractures in teeth with metal posts" 14 : 20140428-, 2015

13 Hassan B, "Influence of scanning and reconstruction parameters on quality of three-dimensional surface models of the dental arches from cone beam computed tomography" 14 : 303-310, 2010

14 Pinto MGO, "Influence of exposure parameters on the detection of simulated root fractures in the presence of various intracanal materials" 50 : 586-594, 2017

15 Ferreira LM, "Influence of CBCT enhancement filters on diagnosis of vertical root fractures: a simulation study in endodontically treated teeth with and without intracanal posts" 44 : 20140352-, 2015

16 Benic GI, "In vitro assessment of artifacts induced by titanium dental implants in cone beam computed tomography" 24 : 378-383, 2013

17 Bamba J, "Image quality assessment of three cone beam CT machines using the SEDENTEXCT CT phantom" 42 : 20120445-, 2013

18 Boas FE, "Evaluation of two iterative techniques for reducing metal artifacts in computed tomography" 259 : 894-902, 2011

19 Bechara B, "Evaluation of a cone beam CT artefact reduction algorithm" 41 : 422-428, 2012

20 Helvacioglu-Yigit D, "Evaluation and reduction of artifacts generated by 4 different root-end filling materials by using multiple cone-beam computed tomography imaging settings" 42 : 307-314, 2016

21 de-Azevedo-Vaz SL, "Efficacy of a cone beam computed tomography metal artifact reduction algorithm for the detection of peri-implant fenestrations and dehiscences" 121 : 550-556, 2016

22 Bechara B, "Comparison of cone beam CT scans with enhanced photostimulated phosphor plate images in the detection of root fracture of endodontically treated teeth" 42 : 20120404-, 2013

23 Hunter AK, "Characterization and correction of cupping effect artefacts in cone beam CT" 41 : 217-223, 2012

24 Esmaeili F, "Beam hardening artifacts by dental implants: comparison of cone-beam and 64-slice computed tomography scanners" 10 : 376-381, 2013

25 Draenert FG, "Beam hardening artefacts occur in dental implant scans with the NewTom cone beam CT but not with the dental 4-row multidetector CT" 36 : 198-203, 2007

26 Nagarajappa AK, "Artifacts: the downturn of CBCT image" 5 : 440-445, 2015

27 Barrett JF, "Artifacts in CT: recognition and avoidance" 24 : 1679-1691, 2004

28 Jaju PP, "Artefacts in cone beam CT" 3 : 292-297, 2013

29 Schulze R, "Artefacts in CBCT: a review" 40 : 265-273, 2011

30 Vasconcelos KF, "Artefact expression associated with several cone-beam computed tomographic machines when imaging root filled teeth" 48 : 994-1000, 2015

31 Nackaerts O, "Analysis of intensity variability in multislice and cone beam computed tomography" 22 : 873-879, 2011