scholarly journals Optimization of cone beam computed tomography for the assessment of alterations of the maxillary sinuses

2021 ◽  
Vol 10 (11) ◽  
pp. e456101120025
Author(s):  
Bárbara Cristina Anrain ◽  
Ademir Franco ◽  
Danieli Moura Brasil ◽  
José Luiz Cintra Junqueira ◽  
Luciana Butini de Oliveira ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Image Quality ◽  
Cone Beam Computed Tomography ◽  
Cone Beam ◽  
Energy Parameters ◽  
Multiplanar Reconstructions ◽  
Computed Tomography Scans ◽  
General Quality ◽  
Acceptable Image Quality ◽  
Maxillary Sinuses

Objective: To test the standard protocols of a CBCT unit in order to find lower-dose alternatives with diagnostically acceptable image quality for the maxillary sinuses visualization.  Study design: An observational study was performed. Two dry skulls were used to simulate four conditions of the maxillary sinuses: normality, mucous retention pseudocyst, membrane thickening and bone graft. Cone beam computed tomography scans were obtained with an i-CAT classic unit using different acquisition protocols and a box of polystyrene to simulate soft tissue attenuation. All the protocols were established by the manufacturer, combining different energy parameters, fields of view and voxel sizes. Multiplanar reconstructions were presented to three Oral Radiologists through blind and randomized distribution. The specialists judged general image quality, sharpness, contrast, and the presence of noise and artifacts based on a 4-points scale. Results: Protocols with higher energy parameters had significant association with higher scores for general quality, sharpness and contrast (p<0.05). Protocols with intermediate level of radiation dose had also significant association with good and excellent image quality; for the presence of noise and artifacts the images were rated acceptable. Conclusion: i-CAT default protocols with lower dose of radiation were able to deliver acceptable image quality for the visualization of the maxillary sinuses.

Comparative assessment of subjective image quality of cross-sectional cone-beam computed tomography scans

2011 ◽  
Vol 53 (4) ◽  
pp. 501-508 ◽  
Author(s):  
Kivanç Kamburoglu ◽  
Sema Murat ◽  
Eray Kolsuz ◽  
Hakan Kurt ◽  
Selcen Yüksel ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Image Quality ◽  
Cone Beam Computed Tomography ◽  
Comparative Assessment ◽  
Cone Beam ◽  
Cross Sectional ◽  
Subjective Image Quality ◽  
Computed Tomography Scans

scholarly journals A technical note on intra-arterial cone-beam computed tomography for the evaluation of flow-diverter stents: Image quality differences between diluted and non-diluted contrast medium

2019 ◽  
Vol 26 (2) ◽  
pp. 164-169
Author(s):  
Naci Kocer ◽  
Sedat G Kandemirli ◽  
Daniel Ruijters ◽  
Michalis Mantatzis ◽  
Osman Kizilkilic ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Image Quality ◽  
Contrast Medium ◽  
Cone Beam Computed Tomography ◽  
Vessel Wall ◽  
Flow Diverter ◽  
Cone Beam ◽  
Gray Scale ◽  
Stent Deployment ◽  
Contrast Technique

Background Design of flow-diverter stents for flexibility, tractability, and low profile limits their radiopacity on conventional digital subtraction angiography. Cone-beam computed tomography (CBCT) offers higher spatial resolution for the evaluation of flow-diverter stents. However, CBCT requires optimal dilution and timing of contrast medium for simultaneous visualization of the stent, arterial lumen, and vessel wall. There are only limited data on the effects of different contrast dilutions on CBCT image quality in neurointerventional applications. Materials and methods In our institution, intra-arterial CBCTs were acquired during stent deployment and at follow-ups with 10% diluted contrast. We had recently started acquiring intra-arterial CBCTs with non-diluted contrast. Retrospective analysis of our flow-diverter data identified eight cases with different aneurysm locations who had intra-arterial CBCT with 10% diluted contrast immediately after flow-diverter stent deployment and with non-diluted contrast technique during follow-ups. For each case, the image quality between diluted and non-diluted contrast techniques was compared qualitatively by assessing stent visualization and quantitatively by plotting gray-scale intensity values along the vessel lumen. Results In two sets of CBCT images per each case, there was no substantial difference between diluted and non-diluted CBTC techniques for the evaluation of stent architecture and lumen opacification. Gray-scale intensity values perpendicular to the lumen revealed similar intensity values along the neighboring parenchyma, vessel wall, and lumen for the two different contrast techniques. Conclusion Intra-arterial CBCT angiography can be performed without contrast dilution and still achieve adequate image quality in certain cerebral aneurysms treated with flow diverter. The non-diluted contrast technique avoids the time loss during preparation of diluted contrast and installation of diluted contrast to the injector in angiography suites with a single power injector.

scholarly journals The Effect of Implant-Induced Artifacts on Interpreting Adjacent Bone Structures on Cone-Beam Computed Tomography Scans

2018 ◽  
Vol 27 (1) ◽  
pp. 10-14 ◽  
Author(s):  
Rachel A. Sheridan ◽  
Yi-Chen Chiang ◽  
Ann M. Decker ◽  
Pimchanok Sutthiboonyapan ◽  
Hsun-Liang Chan ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Cone Beam ◽  
Computed Tomography Scans ◽  
Bone Structures

Feasibility study of a s ynchronized-mo ving-g rid (SMOG) system to improve image quality in cone-beam computed tomography (CBCT)

2012 ◽  
Vol 39 (8) ◽  
pp. 5099-5110 ◽  
Author(s):  
Lei Ren ◽  
Fang-Fang Yin ◽  
Indrin J. Chetty ◽  
David A. Jaffray ◽  
Jian-Yue Jin
Keyword(s):  
Computed Tomography ◽  
Image Quality ◽  
Feasibility Study ◽  
Cone Beam Computed Tomography ◽  
Cone Beam ◽  
Improve Image Quality

scholarly journals Age- and sex-related changes of the volume of maxillary sinuses quantified via cone beam computed tomography

2021 ◽  
Vol 10 (14) ◽  
pp. e312101422220
Author(s):  
Lucas Eigi Borges Tanaka ◽  
Ademir Franco ◽  
Rafael Ferreira Abib ◽  
Luiz Roberto Coutinho Manhães-Junior ◽  
Sergio Lucio Pereira de Castro Lopes
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Three Dimensional ◽  
Specific Treatment ◽  
Cone Beam ◽  
Patient Specific ◽  
Sample Collection ◽  
Left And Right ◽  
Age And Sex ◽  
Maxillary Sinuses

Anatomical studies found in cone beam computed tomography (CBCT) an optimal resource for the three-dimensional (3D) assessment of the head and neck. When it comes to the maxillary sinuses, CBCT enables a life-size reliable volumetric analysis. This study aimed to assess the age and sex-related changes of the maxillary sinuses using volumetric CBCT analysis. The sample consisted of CBCT scans of 112 male (n = 57) and female (n = 55) individuals (224 maxillary sinuses) distributed in 5 age categories: 20 |— 30, 31 |— 40, 41 |— 50, 51 |— 60 and > 60 years. Image acquisition was accomplished with the i-CAT Next Generation device set with voxel size of 0.25 mm and field of view that included the maxillary sinuses (retrospective sample collection from an existing database). Image segmentation was performed in itk-SNAP (www.itksnap.org) software. The volume (mm3) of the segmented sinuses was quantified and compared pairwise based on side (left and right), sex (male and female) and age (five groups). Differences between left and right sides volume were not statistically significant (p > 0.05). The mean volume of maxillary sinuses in males was 22% higher than females (p = 0.0001). Volumetric differences were not statistically significant between age categories for males and females (p > 0.05). The discriminant power of sinuses’ volume may support customized and patient-specific treatment planning based on sex.

Influence of cone-beam computed tomography milliamperage settings on image quality of the mandibular third molar region

2013 ◽  
Vol 30 (1) ◽  
pp. 27-31 ◽  
Author(s):  
Frederico Sampaio Neves ◽  
Thaís de Camargo Souza ◽  
Sérgio Lins de-Azevedo-Vaz ◽  
Paulo Sérgio Flores Campos ◽  
Frab Norberto Bóscolo
Keyword(s):  
Computed Tomography ◽  
Image Quality ◽  
Cone Beam Computed Tomography ◽  
Third Molar ◽  
Cone Beam ◽  
Mandibular Third Molar ◽  
Molar Region

Comparison of Hand and Semiautomatic Tracing Methods for Creating Maxillofacial Artificial Organs using Sequences of Computed Tomography (CT) and Cone Beam Computed Tomography (CBCT) Images

2017 ◽  
Vol 40 (6) ◽  
pp. 307-312 ◽  
Author(s):  
Bence T. Szabo ◽  
Seçil Aksoy ◽  
Gabor Repassy ◽  
Krisztian Csomo ◽  
Csaba Dobo-Nagy ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Volume Measurement ◽  
Artificial Organs ◽  
Cone Beam ◽  
Artificial Organ ◽  
Volume Determination ◽  
Measurement Results ◽  
Volume Measurements ◽  
Maxillary Sinuses

Introduction The aim of this study was to compare the paranasal sinus volumes obtained by manual and semiautomatic imaging software programs using both CT and CBCT imaging. Methods 121 computed tomography (CT) and 119 cone beam computed tomography (CBCT) examinations were selected from the databases of the authors’ institutes. The Digital Imaging and Communications in Medicine (DICOM) images were imported into 3-dimensonal imaging software, in which hand mode and semiautomatic tracing methods were used to measure the volumes of both maxillary sinuses and the sphenoid sinus. The determined volumetric means were compared to previously published averages. Results Isometric CBCT-based volume determination results were closer to the real volume conditions, whereas the non-isometric CT-based volume measurements defined coherently lower volumes. By comparing the 2 volume measurement modes, the values gained from hand mode were closer to the literature data. Furthermore, CBCT-based image measurement results corresponded to the known averages. Conclusions Our results suggest that CBCT images provide reliable volumetric information that can be depended on for artificial organ construction, and which may aid the guidance of the operator prior to or during the intervention.

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