Mapping of a multilayer panoramic radiography device

Objective: To map the shape, location, and thickness of the focal trough of a panoramic radiography device with a multilayer imaging program. Methods: An acrylic plate (148 × 148 × 3 mm) containing 1156 holes distributed in a matrix of 34 × 34 rows was placed in the OP300 Maxio at the levels of the maxilla and mandible. 20 metal spheres (3.5 mm in diameter) were placed on the holes of the plate under 15 different arrangements and panoramic images were acquired for each arrangement at 66 kV, 8 mA, and an exposure time of 16 s. The resulting panoramic radiographs from the five image layers were exported, the horizontal and vertical dimensions of the metal spheres were measured in all images using the Image J software, and the magnification and distortion rates of the spheres were calculated. All metal spheres presenting a magnification rate lower than 30% in both vertical and horizontal dimensions and a distortion rate lower than 10% were considered to map the focal troughs of each of the five image layers. Results: All panoramic image layers had a curved shape ranging from 39° to 51° for both dental arches and varied in position and thickness. The anterior region of maxilla was anteriorly displaced when compared to the anterior region of the mandible for all layers. Image layers are thicker at the level of the mandible than those at the level of the maxilla; also, inner layers were thinner and outer layers were thicker. Conclusion All image layers in the studied panoramic radiography device had a curved shape and varied in position and thickness. The anterior region of maxilla was anteriorly displaced when compared to that of the mandible for all layers.

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A Comparison of Panoramic Image Quality between a Digital Radiography Storage Phosphor System and a Film-Based System

The Journal of Contemporary Dental Practice ◽

10.5005/jcdp-11-1-9 ◽

2010 ◽

Vol 11 (1) ◽

pp. 9-16

Author(s):

Farah Masood ◽

Nikos Parissis ◽

Christos Angelopoulos ◽

Stephen Mantegari ◽

Stelios Karamanis ◽

...

Keyword(s):

Image Quality ◽

Digital Radiography ◽

Panoramic Radiography ◽

Third Molar ◽

Third Molar Surgery ◽

Panoramic Image ◽

Storage Phosphor ◽

Digital Panoramic Radiography ◽

Panoramic Images ◽

Storage Phosphor System

Abstract Aim To compare digital panoramic images acquired for the presurgical assessment of third molars captured with a storage phosphorbased system with conventional film panoramic radiographs. Methods and Materials A total of 51 pairs of digital and conventional panoramic images, made simultaneously, were included in this study. The images were evaluated for diagnostic quality prior to third molar surgery by two experienced oral surgeons and rated with a four-point grading scale. Results Despite the fact that conventional panoramic images were rated higher than the digital images, the difference was not statistically significant. Conclusions Conventional and digital panoramic images were found to be of comparable image quality with regard to their diagnostic contribution to third molar surgery. Clinical Significance This study is contributory to understanding differences in image quality between digital and conventional panoramic radiography for certain diagnostic tasks. The lack of significant differences in image quality may be an endorsement for digital panoramic radiography. Citation Parissis N, Angelopoulos C, Mantegari S, Karamanis S, Masood F, Tsirlis A. A Comparison of Panoramic Image Quality between a Digital Radiography Storage Phosphor System and a Film-Based System. J Contemp Dent Pract [Internet]. 2010 Jan; 11(1):009-016. Available from: http://www.thejcdp.com/journal/view/ volume11-issue1-parissis.

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The Appearance of The Infraorbital Canal and Infraorbital Ethmoid (Haller’s) Cells on Panoramic Radiography of Edentulous Patients

BioMed Research International ◽

10.1155/2018/1293124 ◽

2018 ◽

Vol 2018 ◽

pp. 1-6 ◽

Cited By ~ 1

Author(s):

Esra Yesilova ◽

Ibrahim Sevki Bayrakdar

Keyword(s):

Orofacial Pain ◽

Panoramic Radiography ◽

Anterior Region ◽

Study Group ◽

Panoramic Radiographs ◽

Image Characteristics ◽

Infraorbital Canal ◽

Significant Difference ◽

Edentulous Patients

Objectives.The aim of the study is to detect the prevalence and the characteristics of infraorbital canal and Haller’s cells on panoramic radiography of edentulous patients.Methods.The study group comprised 291 panoramic radiographs of edentulous patients. Radiographs were interpreted for the visibility and characteristics of infraorbital canal and Haller’s cells. For classification of infraorbital canal, a method based on the image characteristics of the border of the canal (Types I, II, and III) was used. Haller’s cells were grouped according to the number and the shape of loculations.Results.Infraorbital canal was observed in 246 (84.6%) radiographs. The most prevalent of the observed canals were Type III for both sides (39.9 % for right and 32.3% for left side). The visibility of Haller’s cells was 23.7%. The frequencies of Haller’s cells’ visibility were approximately equal for both genders. There is no significant difference between genders for the visibility of infraorbital canal and Haller’s cells.Conclusions.The surgeons, implantologists, and radiologists should take into consideration infraorbital canal and Haller’s cell for planning implant surgery of maxillary anterior region and undefined orofacial pain for edentulous patients.

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Clinical Evaluation of Dose Reduction on Image Quality of Panoramic Radiographs

The Journal of Contemporary Dental Practice ◽

10.5005/jcdp-9-5-34 ◽

2008 ◽

Vol 9 (5) ◽

pp. 34-41 ◽

Cited By ~ 4

Author(s):

Meryem Toraman Alkurt ◽

Likay Peker ◽

Gülten Usalan ◽

Bülent Altunkaynak

Keyword(s):

Image Quality ◽

Dose Reduction ◽

Clinical Evaluation ◽

Panoramic Radiography ◽

Panoramic Radiographs ◽

Tube Current ◽

Digital Panoramic Radiography ◽

Significant Difference ◽

Panoramic Images

Abstract Aim The purpose of this study was to evaluate the effect of tube current reduction on image quality using medium and regular intensifying screens as well as a digital system for panoramic radiography. Methods and Materials A total of 150 panoramic images of 75 patients were obtained in the study. The initial images were taken at standard exposure settings, and secondary images were exposed with the tube current reduced at different rates. Results There was no statistically significant difference (p>0.05) between the two exposures for Group 3 (the rate of dose reduction 25%) while a statistically significant difference (p<0.05) was found in Group 4 (the rate of dose reduction 50%) using medium intensifying screens for all observers. No statistically significant difference was found between the two exposures on digital panoramic images. Conclusion According to the results of this study a dose reduction of 25% was achieved for medium intensifying screens and for digital panoramic images without any loss of image quality. Clinical Significance A substantial reduction in radiation exposure can be achieved in conventional panoramic radiography using a medium intensifying screen and in digital panoramic radiography without any loss of image quality needed for radiological evaluation of anatomical structures and pathological conditions. Citation Alkurt MT, Peker I, Usalan G, Altunkaynak B. Clinical Evaluation of Dose Reduction on Image Quality of Panoramic Radiographs. J Contemp Dent Pract 2008 July; (9)5:034-041.

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Detection and classification of unilateral cleft alveolus with and without cleft palate on panoramic radiographs using a deep learning system

Scientific Reports ◽

10.1038/s41598-021-95653-9 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Chiaki Kuwada ◽

Yoshiko Ariji ◽

Yoshitaka Kise ◽

Takuma Funakoshi ◽

Motoki Fukuda ◽

...

Keyword(s):

Deep Learning ◽

Cleft Palate ◽

Panoramic Radiography ◽

False Positive Rate ◽

Normal Subjects ◽

Learning System ◽

Panoramic Radiographs ◽

Positive Rate ◽

Aided Diagnosis

AbstractAlthough panoramic radiography has a role in the examination of patients with cleft alveolus (CA), its appearances is sometimes difficult to interpret. The aims of this study were to develop a computer-aided diagnosis system for diagnosing the CA status on panoramic radiographs using a deep learning object detection technique with and without normal data in the learning process, to verify its performance in comparison to human observers, and to clarify some characteristic appearances probably related to the performance. The panoramic radiographs of 383 CA patients with cleft palate (CA with CP) or without cleft palate (CA only) and 210 patients without CA (normal) were used to create two models on the DetectNet. The models 1 and 2 were developed based on the data without and with normal subjects, respectively, to detect the CAs and classify them into with or without CP. The model 2 reduced the false positive rate (1/30) compared to the model 1 (12/30). The overall accuracy of Model 2 was higher than Model 1 and human observers. The model created in this study appeared to have the potential to detect and classify CAs on panoramic radiographs, and might be useful to assist the human observers.

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Artificial intelligence system for automatic deciduous tooth detection and numbering in panoramic radiographs

Dentomaxillofacial Radiology ◽

10.1259/dmfr.20200172 ◽

2021 ◽

pp. 20200172

Author(s):

Münevver Coruh Kılıc ◽

Ibrahim Sevki Bayrakdar ◽

Özer Çelik ◽

Elif Bilgir ◽

Kaan Orhan ◽

...

Keyword(s):

Artificial Intelligence ◽

Deep Learning ◽

Confusion Matrix ◽

Forensic Identification ◽

Deciduous Teeth ◽

Time Saving ◽

Panoramic Radiographs ◽

Intelligence System ◽

Promising Tool ◽

Panoramic Images

Objective: This study evaluated the use of a deep-learning approach for automated detection and numbering of deciduous teeth in children as depicted on panoramic radiographs. Methods and materials: An artificial intelligence (AI) algorithm (CranioCatch, Eskisehir-Turkey) using Faster R-CNN Inception v2 (COCO) models were developed to automatically detect and number deciduous teeth as seen on pediatric panoramic radiographs. The algorithm was trained and tested on a total of 421 panoramic images. System performance was assessed using a confusion matrix. Results: The AI system was successful in detecting and numbering the deciduous teeth of children as depicted on panoramic radiographs. The sensitivity and precision rates were high. The estimated sensitivity, precision, and F1 score were 0.9804, 0.9571, and 0.9686, respectively. Conclusion: Deep-learning-based AI models are a promising tool for the automated charting of panoramic dental radiographs from children. In addition to serving as a time-saving measure and an aid to clinicians, AI plays a valuable role in forensic identification.

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Correlation between spatial resolution and ball distortion rate of panoramic radiography

10.21203/rs.3.rs-28995/v1 ◽

2020 ◽

Author(s):

Han-Gyeol Yeom ◽

Sam-Sun Lee ◽

Jo-Eun Kim ◽

Kyung-Hoe Huh ◽

Won-Jin Yi ◽

...

Keyword(s):

Standard Deviation ◽

Spatial Resolution ◽

Panoramic Radiography ◽

Reference Value ◽

Vertical Line ◽

Line Pair ◽

Horizontal Line ◽

Student’S T ◽

High Degree ◽

Distortion Rate

Abstract BackgroundThe purpose of this study was to analyze the correlation between spatial resolution and ball distortion rate of panoramic radiography and to elucidate the minimum criterion for ball distortion rate, which is very relevant to clinical readability.MethodsHorizontal and vertical spatial resolution and ball distortion rates were calculated in the same position, such as the incisor, premolar, molar, and temporomandibular joint area with various object depths corresponding to 48 mm. Three devices were evaluated. A region showing spatial resolution above the reference standard was selected, and the ball distortion rate corresponding to the same region was divided into horizontal and vertical phantom groups.The mean and standard deviation of the obtained ball distortion rates were calculated. Student’s t-test was used to statistically analyze the mean difference in ball distortion rates between vertical and horizontal phantom groups.ResultsIn all devices, the horizontal line pair phantom, but not the vertical line pair phantom, was readable in all areas measured at the line pair value of at least 1.88 lp/mm. The line pair value tended to be higher toward the center and lower toward the outside. The ball distortion rate tended to decrease closer to the center and increased further away. In addition, ball distortion rates could not be measured at some areas as they were not recognized as balls due to the high degree of distortion at the outermost and innermost sides. The number of balls satisfying the reference value using the horizontal line pair phantom was 102 (mean of ball distortion rates, 20.98; standard deviation, 15.25). The number of balls satisfying the reference value using the vertical line pair phantom was 49 (mean of ball distortion rates, 16.33; standard deviation, 14.25). However, mean ball distortion rate was not significantly different between the two groups.ConclusionsFocal layer of panoramic radiography could be evaluated by the spatial resolution using horizontal and vertical line pair phantoms and by assessing ball distortion rates through a ball-type panorama phantom. A ball distortion rate of 20% could be used as a threshold to evaluate the focal layer of panoramic radiography.

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Predicting the Risk of Inferior Alveolar Nerve Injury in Impacted Lower Third Molars Using Panoramic Radiography and Cone Beam Computed Tomography

Journal of Evolution of Medical and Dental Sciences ◽

10.14260/jemds/2021/593 ◽

2021 ◽

Vol 10 (34) ◽

pp. 2910-2914

Author(s):

Abhishek Verma ◽

Stuti Verma ◽

Anushikha Dhankhar ◽

Nitin Kumar Moral ◽

Nidhi Nagar ◽

...

Keyword(s):

Computed Tomography ◽

Nerve Injury ◽

Cone Beam Computed Tomography ◽

Panoramic Radiography ◽

Inferior Alveolar Nerve ◽

Third Molar ◽

Cone Beam ◽

Third Molars ◽

Panoramic Radiographs ◽

Inferior Alveolar Nerve Injury

BACKGROUND A serious complication of surgical removal of impacted lower third molars is inferior alveolar nerve (IAN) injury. Evaluation of radiographic factors to predict IAN injury using CT and panoramic radiography includes root morphology assessment, follicular sac size, mandibular bone density, inferior alveolar nerve and vessels, condition of the overlying tissues, relation of the impacted tooth with the body and ramus of the mandible and the adjacent teeth. This study was done to evaluate the radiological features of the impacted lower mandibular teeth and their relationship with IAN through panoramic radiography and CT and to assess the most predictable radiological criteria for inferior alveolar nerve injury in impacted third molar surgery. METHODS All the patients indicated for lower third molar extraction were included in the study and pre-operative conventional panoramic radiographs (Planmeca Proline PM 2002 CC, Helsinki, Finland) and CBCT (Kodak CBCT) were taken. Any post-operative nerve injuries detected were followed up after 15 days or 1 month. Fisher’s exact test was done to find the association between the outcome variable and explanatory variables. RESULTS Only 11.4 % (N = 4) of all participants had IAN injury following surgical disimpaction. All the participants with IAN injury showed narrowing of the canal on their preoperative panoramic radiographs and presence of nerve approximation with the tooth in cone beam computed tomography (CBCT) reports (P < 0.05). CONCLUSIONS A statistically significant association exists between IAN injury and nerve exposure, radiographic signs of nerve involvement for panoramic radiograph, level of third molar impaction, and nerve approximation in CBCT. KEY WORDS Inferior Alveolar Nerve Injury, Lower Third Molar Impaction, Panoramic Radiography, CBCT

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Automatic Registration of Mobile Mapping System Lidar Points and Panoramic-Image Sequences by Relative Orientation Model

Photogrammetric Engineering & Remote Sensing ◽

10.14358/pers.21-00006r2 ◽

2021 ◽

Vol 87 (12) ◽

pp. 913-922

Author(s):

Ningning Zhu ◽

Bisheng Yang ◽

Zhen Dong ◽

Chi Chen ◽

Xia Huang ◽

...

Keyword(s):

Image Sequence ◽

Image Sequences ◽

Relative Orientation ◽

Panoramic Image ◽

Feature Points ◽

Mobile Mapping ◽

Orientation Model ◽

Mapping System ◽

Panoramic Images ◽

Mobile Mapping System

To register mobile mapping system (MMS) lidar points and panoramic-image sequences, a relative orientation model of panoramic images (PROM) is proposed. The PROM is suitable for cases in which attitude or orientation parameters are unknown in the panoramic-image sequence. First, feature points are extracted and matched from panoramic-image pairs using the SURF algorithm. Second, these matched feature points are used to solve the relative attitude parameters in the PROM. Then, combining the PROM with the absolute position and attitude parameters of the initial panoramic image, the MMS lidar points and panoramic-image sequence are registered. Finally, the registration accuracy of the PROM method is assessed using corresponding points manually selected from the MMSlidar points and panoramic-image sequence. The results show that three types of MMSdata sources are registered accurately based on the proposed registration method. Our method transforms the registration of panoramic images and lidar points into image feature-point matching, which is suitable for diverse road scenes compared with existing methods.

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