Accuracy and precision of manual segmentation of the maxillary sinus in MR images-a method study (original) (raw)
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Computed tomography-based volumetric tool for standardized measurement of the maxillary sinus
PloS one, 2018
Volume measurements of maxillary sinus may be useful to identify diseases affecting paranasal sinuses. However, literature shows a lack of consensus in studies measuring the volume. This may be attributable to different computed tomography data acquisition techniques, segmentation methods, focuses of investigation, among other reasons. Furthermore, methods for volumetrically quantifying the maxillary sinus are commonly manual or semiautomated, which require substantial user expertise and are time-consuming. The purpose of the present study was to develop an automated tool for quantifying the total and air-free volume of the maxillary sinus based on computed tomography images. The quantification tool seeks to standardize maxillary sinus volume measurements, thus allowing better comparisons and determinations of factors that influence maxillary sinus size. The automated tool utilized image processing techniques (watershed, threshold, and morphological operators). The maxillary sinus v...
Volumetric and linear assessment of maxillary sinuses using computed tomography
Bulletin du Groupèment international pour la recherche scientifique en stomatologie & odontologie
The purpose of this work was to compare linear and volumetric measurements of maxillary sinus (with and without lesion), using 3D (gold standard) and multiplanar reconstructions (MRP) by computed tomography in order to establish the precision and accuracy of these methods, determining which one would allow more effective assessments for this site. Linear measurements were performed in the maxillary sinus of 50 patients and compared with MPR and 3D images. We also analyzed the area and volume of this anatomic structure. Inter-and intra-observer average percentage errors for linear measurements were lower than 4%, the samples with lesion presenting higher values. The average error of accuracy was 4.94% for sinuses with lesion, and 7.41% for those without. We could verify that the anteroposterior and right-left measurements in axial view showed smaller figures of error when compared to sagittal and coronal reconstructions, respectively. The largest diameters observed for the sinuses had, in average, 39.6 mm in the anteroposterior direction, 28.35 mm in the right-left direction, and 36.3 mm in the superoinferior. For the volume and area assessment, the values of error ranged lower than 9%, the highest values corresponding to the samples with lesion. The precision of measurements was inferior for maxillary sinus with lesion when compared with those without lesion. Measurements performed in the axial view were more precise than those performed in MPR images, and the coronal view measurements were considered to be more precise than the sagittal measurements.
2014
Objectives: The paranasal sinuses are complex anatomical structures with a significant inter-individual variation. The dimensions of maxillary sinuses are particularly significant when considering endoscopic sinus surgery . The aims of this study were to estimate different dimensions of the maxillary sinuses measured on head CT, and their relations to sex of the individuals. Materials and Methods: Cranial computerized tomographic images (CT) of 200 normal subjects between the age groups of 18 and 80 years were observed in this study. The height, width, and depth of the maxillary sinuses were measured with a Philips Brilliance 64 CT. The statistical analysis for sex and age comparison for all the parameters was done. Results: The mean width, height, and depth of maxillary sinus in male on both right and left side were 27.8, 28.2, 39.9, 39.6, and 40.0, 39.7 mm but in females were 26.6, 26.7, 36.8, 37.1, and 36.6, 37.4 mm. The discriminative analysis showed that the accuracy of maxilla...
Introducing a simple method of maxillary sinus volume assessment based on linear dimensions
Annals of anatomy = Anatomischer Anzeiger : official organ of the Anatomische Gesellschaft, 2018
Measuring sinus volume in a general practice clinic is a complex and time-consuming procedure, requiring experience in the use of radiological methods In the presented research, the automatically estimated maxillary sinus volume was compared with maxillary sinus volume assessed with mathematical formulas used to calculate the volume of spheres and pyramids. The starting point for the statistical analysis were specific measurements of the sinuses. We wanted to discover which geometric shape has the volume that is nearest to the automatically estimated volume. The study was performed using samples of CT scans of pediatric patients age 1-17. The dimensions (maximal width, maximal height, maximal length) were used for manual calculations. For the automatic volume calculation, the CT Image Segmentation algorithm (Syngo Via for Oncology, Siemens) was used. Pearson's correlation coefficient was applied to analyse the interrelationship between automatically and manually calculated volum...
Linear and volumetric assessment of the maxillary sinus
Scripta Scientifica Medicinae Dentalis, 2016
INTRODUCTION: Pneumatization of the maxillary sinus can be triggered throughout a patient's life. Prior to any sinus floor augmentation procedure, it is imperative to conduct a linear and volumetric assessment of the maxillary sinus.
European Radiology, 2002
Our objective was to establish the age-related 3D size of maxillary, sphenoid, and frontal sinuses. A total of 179 magnetic resonance imaging (MRI) of children under 17 years (76 females, 103 males) were included and sinuses were measured in the three axes. Maxillary sinuses measured at birth (mean±standard deviation) 7.3±2.7 mm length (or antero-posterior)/4.0±0.9 mm height (or cranio-caudal)/2.7±0.8 mm width (or transverse). At 16 years old, maxillary sinus measured 38.8±3.5 mm/36.3±6.2 mm/27.5± 4.2 mm. Sphenoid sinus pneumatization starts in the third year of life after conversion from red to fatty marrow with mean values of 5.8±1.4 mm/8.0±2.3 mm/5.8±1.0 m m. Pneumatization progresses gradually to reach at 16 years 23.0±4.5 mm/22.6±5.8 mm/12.8± 3.1 mm. Frontal sinuses present a wide variation in size and most of the time are not valuable with rou-tine head MRI techniques. They are not aerated before the age of 6 years. Frontal sinuses dimensions at 16 years were 12.8±5.0 mm/ 21.9±8.4 mm/24.5±13.3 mm. A sinus volume index (SVI) of maxillary and sphenoid sinus was computed using a simplified ellipsoid volume formula, and a table with SVI according to age with percentile variations is proposed for easy clinical application. Percentile curves of maxillary and sphenoid sinuses are presented to provide a basis for objective determination of sinus size and volume during development. These data are applicable to other techniques such as conventional Xray and CT scan.
Relative area measurement of maxillary sinus by computed tomography
RGO - Revista Gaúcha de Odontologia, 2014
OBJECTIVE: To evaluate the relative area of the maxillary sinus in edentulous posterior maxilla with regard to linear area, bone septa and sinus pathologies. METHODS: A retrospective longitudinal study was conducted of tomographic exams in 60 individuals between 35 and 75 years of age, with the inclusion criteria being the uni- or bilateral edentulous posterior maxilla. Measurements were taken by the program in 101 maxillary sinuses. The horizontal and vertical measurements of each sinus were multiplied and resulted in a linear area in mm2. RESULTS: Of the 101 maxillary sinuses evaluated, 14 presented sinus pathologies (13.86%) and 22 (21.78%) with bone septa. The mean mesio distal distance was 38.4 mm (p ≤ 0.05), mean height 34. 5 mm (p ≤ 0.05) and mean linear area of 1335.88 mm² (p = 0.05). The Student's-t and analysis of variance (ANOVA) tests were applied for statistical analysis There were no statistically significant difference in the height and width of the edentulous max...
Assessment of Maxillary Sinus Wall Thickness with Paranasal Sinus Digital Tomosynthesis and CT
Journal of the Korean Society of Radiology, 2017
This study was performed to compare paranasal sinus tomosynthesis with computed tomography (CT) imaging as a radiologic tool to evaluate the paranasal sinuses, using measurement of the soft tissue thickness of the maxillary sinus. Materials and Methods: A total of 114 patients with sinusitis who underwent both paranasal sinus digital tomosynthesis (DT) and CT were enrolled in this retrospective study. Two observers independently assessed soft tissue thickness in both maxillary sinus chambers using both DT and CT images. Results: The mean difference in soft tissue thickness measured by each observer was-0.31 mm on CT and 0.15 mm on DT. The mean differences in soft tissue thickness measured with DT and CT were-0.15 by observer 1 and-0.31 by observer 2. Evaluation of the agreement in measurement of soft tissue thickness in the maxillary sinus using DT and CT showed a high intraclass correlation, with the 95% limit of agreement ranging from-3.36 mm to 3.06 mm [intraclass correlation coefficient (ICC), 0.994: p < 0.01] for observer 1 and from-5.56 mm to 4.95 mm (ICC, 0.984: p < 0.01) for observer 2. Conclusion: As an imaging tool, DT is comparable to CT for assessing the soft tissue thickness of maxillary sinuses in patients with sinusitis.
Evaluation of Variations of Maxillary Sinus on Computed Tomography
MVP Journal of Medical Sciences, 2018
Background: Maxillary sinus although shows normal anatomical variations and it is important to know about them. Evaluating maxillary sinus and identifying its variations on Computed Tomography not only detects the different variations but also helps in planning and guiding Various Sinus Surgery and preventing possible complications. Purpose: Aim of this study was to detect anatomical variations of maxillary sinuses in patients using Multi-detector Computed Tomography. Materials and Methods: Paranasal sinuses of 130 patients who were subjected to Computerised Tomography of Paranasal Sinus with CT (Seimens 128 slice Somatom Perspective) machine were studied. Results: A total PNS Para Nasal Sinuses of total 130 patients were studied. Out of which only 36 patients had maxillary sinu variations. Among accessory ostia of maxillary sinus was the commonest anatomical variation and was seen in 23 (18%) of cases. Hyperpneumatization of maxillary sinus was detected in 7cases (5%) and Antral septa were found in 13 cases (10%). Conclusion: Thus, it's important to accurately assess the maxillary sinus on Computed Tomography and to determine the various anatomical variations of the same so as to differentiate pathological lesions from an anatomical variation and avoiding unnecessary surgical explorations and complications.