Panoramic Radiography

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J W Oestmann - One of the best experts on this subject based on the ideXlab platform.

Deborah Queiroz Freitas - One of the best experts on this subject based on the ideXlab platform.

  • Comparison of Panoramic Radiography and CBCT to identify maxillary posterior roots invading the maxillary sinus.
    Dento maxillo facial radiology, 2016
    Co-Authors: Luciana Jacome Lopes, Thiago De Oliveira Gamba, Joao V J Bertinato, Deborah Queiroz Freitas
    Abstract:

    Objectives:Given the limitations of Panoramic Radiography for assessing topographic relationship of maxillary teeth with sinus floor, the purpose of this study was to assess signs on Panoramic Radiography that could predict root protrusion into the sinus.Methods:A total of 46 individuals (330 maxillary posterior teeth) who underwent Panoramic Radiography and CBCT were enrolled. The relationship between the posterior teeth and the maxillary sinus and Panoramic Radiography signs (projection of the root apices, interruption of the maxillary sinus floor, lamina dura, darkening in the root apices, and superiorly curving sinus floor enveloping the associated tooth root) associated with protrusion of root apices into the sinus were evaluated.Results:There were differences between the imaging modalities about the positioning of the root apices regarding the sinus (p 

  • comparison of Panoramic Radiography and cbct to identify maxillary posterior roots invading the maxillary sinus
    Dentomaxillofacial Radiology, 2016
    Co-Authors: Luciana Jacome Lopes, Thiago De Oliveira Gamba, Joao V J Bertinato, Deborah Queiroz Freitas
    Abstract:

    Objectives:Given the limitations of Panoramic Radiography for assessing topographic relationship of maxillary teeth with sinus floor, the purpose of this study was to assess signs on Panoramic Radiography that could predict root protrusion into the sinus.Methods:A total of 46 individuals (330 maxillary posterior teeth) who underwent Panoramic Radiography and CBCT were enrolled. The relationship between the posterior teeth and the maxillary sinus and Panoramic Radiography signs (projection of the root apices, interruption of the maxillary sinus floor, lamina dura, darkening in the root apices, and superiorly curving sinus floor enveloping the associated tooth root) associated with protrusion of root apices into the sinus were evaluated.Results:There were differences between the imaging modalities about the positioning of the root apices regarding the sinus (p < 0.05). Only the projecting of the root apices and the interruption of the sinus floor on Panoramic Radiography were predictors for the root protrus...

  • Detection of bifid mandibular condyle by Panoramic Radiography and cone beam computed tomography
    Brazilian Journal of Oral Sciences, 2013
    Co-Authors: Frederico Sampaio Neves, Laura Ricardina Ramírez-sotelo, Gina Delia Roque-torres, Gabriella Lopes Resende Barbosa, Francisco Haiter-neto, Deborah Queiroz Freitas
    Abstract:

    Aim: To compare Panoramic Radiography and cone beam computed tomography (CBCT) in the diagnosis of bifid mandibular condyle. Methods: The sample consisted of 350 individuals who underwent Panoramic Radiography and CBCT. In the Panoramic radiographs and CBCT images, the presence or absence of bifid mandibular condyle was determined. Results: Presence of bifid mandibular condyle was detected in four cases (1.1%). In all cases, the relation of one condylar process to the other was mediolateral and history of trauma was reported. None of the individuals had symptoms. In two cases, Panoramic Radiography did not reveal the presence of bifid mandibular condyle. Conclusions: Initial screening for bifid mandibular condyle can be performed by Panoramic Radiography; however, CBCT images can reveal morphological changes and the exact orientation of the condyle heads.

Soon-chul Choi - One of the best experts on this subject based on the ideXlab platform.

  • Correlation between spatial resolution and ball distortion rate of Panoramic Radiography
    BMC Medical Imaging, 2020
    Co-Authors: Han-gyeol Yeom, Sam-sun Lee, Jo-eun Kim, Kyung-hoe Huh, Min-suk Heo, Soon-chul Choi
    Abstract:

    Background The 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. Methods Horizontal 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. Results In 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. Conclusions Image 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 image layer of Panoramic Radiography.

  • Efficacy of the Monte Carlo method and dose reduction strategies in paediatric Panoramic Radiography.
    Scientific reports, 2019
    Co-Authors: Chena Lee, Bora Park, Sam-sun Lee, Jo-eun Kim, Sang-sun Han, Kyung-hoe Huh, Min-suk Heo, Soon-chul Choi
    Abstract:

    Monte Carlo (MC) simulation is a simpler radiation dose assessment method than the conventional method, thermoluminescent dosimetry (TLD). MC simulation and TLD were compared as tools to evaluate the effective dose from paediatric Panoramic Radiography. Various exposure conditions and machine geometries were simulated using the MC method to investigate factors resulting in effective dose reduction. The effective dose of paediatric Panoramic Radiography was obtained using an MC simulation and its reliability was verified by a comparison with the value obtained using TLD. Next, 7 factors determining the effective dose in the MC simulation were input with 6 equally-spaced values, and a total of 36 simulations were performed to obtain effective dose values. The correlations between each dose-determining factor and the resulting effective dose were evaluated using linear regression analysis. The TLD-measured dose was 3.850 µSv, while the MC simulation yielded a dose of 3.474 µSv. Beam height was the factor that most strongly influenced the effective dose, while rotation angle and focus-to-patient distance were the least influential factors. MC simulation is comparable to TLD for obtaining effective dose values in paediatric Panoramic Radiography. Obtaining Panoramic Radiography with a short beam height can effectively reduce the dose in paediatric patients.

  • comparison of dosimetry methods for Panoramic Radiography thermoluminescent dosimeter measurement versus personal computer based monte carlo method calculation
    Oral Surgery Oral Medicine Oral Pathology and Oral Radiology, 2016
    Co-Authors: Chena Lee, Sam-sun Lee, Jo-eun Kim, Kyung-hoe Huh, Min-suk Heo, Soon-chul Choi
    Abstract:

    Objective The purpose of this study was to evaluate the patient radiation dose based on Panoramic Radiography and calculated with personal computer–based Monte Carlo (PCXMC) software compared with thermoluminescent dosimetry (TLD) measurement. We also proposed appropriate input values for dose-determining factors in PCXMC. Study Design Tissue-absorbed doses and the effective dose based on Panoramic Radiography were measured with TLD and with PCXMC under various conditions. The calculated PCXMC doses were compared with those measured with TLD. Results The effective doses calculated with PCXMC were higher by 9.55% to 51.24% compared with the doses measured with TLD. Reference points on the Y-axis and Z-axis were the sensitive factors when calculating the effective dose. The differences between the highest and the lowest organ doses were 0.32 and 0.10 mGy, respectively, for PCXMC calculation and TLD measurement. Conclusions The effective dose calculated with PCXMC was generally higher than the dose measured by using TLD, and the absorbed doses varied by organ more severely in the PCXMC calculations than in the TLD measurements. The effective dose obtained from PCXMC calculations was dependent on input values for dose-determining factors. Standard values for each dose-determining factor required for the application of PCXMC to Panoramic Radiography were suggested in this study.

Christoph G Diederichs - One of the best experts on this subject based on the ideXlab platform.

Gunilla Tronje - One of the best experts on this subject based on the ideXlab platform.

  • Panoramic Radiography incorporating an inclined film plane
    Oral Radiology, 1994
    Co-Authors: Masaru Shiojima, Ulf Welander, William D Mcdavid, Gunilla Tronje
    Abstract:

    The introduction in Panoramic Radiography of a film plane that is consistently parallel to the object layer has been proposed, and is suggested to constitute a major improvement of the Panoramic technique. The effects of the new approach on geometrical image properties and motion unsharpness are analyzed. For the analysis, an expanded general theory of Panoramic Radiography was derived based on a previously published theory. The advantage of the new technique is that the distortion-free plane in the object coincides with the plane of minimum motion unsharpness. Although the gain in geometrical image properties is offset by a certain loss in resolution and layer thickness, the effect of both features on exposed Panoramic radiographs does not appear to be clinically significant.

  • Layer thickness in Panoramic Radiography as defined by different noise-equivalent passbands
    Oral surgery oral medicine and oral pathology, 1993
    Co-Authors: Masaru Shiojima, Gunilla Tronje, Ulf Welander, William D Mcdavid, Åke Bäckström, Munetaka Naitoh
    Abstract:

    The layer thickness in rotational Panoramic Radiography is presented with the use of the concept of the noise-equivalent passband. Conventionally, the layer thickness has been calculated only from one-dimensional data in the horizontal or rotational dimension of Panoramic Radiography. In the present study, results from calculations using both one- and two-dimensional data are presented. When the vertical dimension is included in the calculations, the layer is wider than when calculated from data in the horizontal dimension only. It is pointed out that the wider layer that follows from the introduction of the vertical dimension may be the most reliable measure of layer thickness in Panoramic Radiography.

  • Dimensional reproduction in direct digital rotational Panoramic Radiography
    Oral surgery oral medicine and oral pathology, 1993
    Co-Authors: William D Mcdavid, Ulf Welander, S. Brent Dove, Gunilla Tronje
    Abstract:

    A linear x-ray detector array can be used to perform rotational Panoramic Radiography provided a technique for data acquisition is used that emulates the dimensional reproduction of a conventional rotational Panoramic radiographic system. This may be accomplished with the use of a variable integration time throughout the excursion. The required interval depends upon the scanning geometry, the selected image plane, and the size of pixels used in the digital image. In a prototype device developed around an Orthopantomograph Model OP10 with 0.225 mm square pixels, the integration times range from about 8 milliseconds to 28 milliseconds. An experimental test was performed by radiographing a number of steel spheres positioned at different object depths. Within the limits of experimental error, there was satisfactory agreement between the measured and theoretical magnification.

  • Point spread functions for rotational Panoramic Radiography: An experimental test
    Oral Radiology, 1992
    Co-Authors: Masaru Shiojima, Gunilla Tronje, Ulf Welander, Åke Bäckström, Doss Mcdavid, Munetaka Naitoh
    Abstract:

    Point spread functions for rotational Panoramic Radiography were determined experimentally. The results were compared with theoretically functions calculated from known system parameters. There was a satisfactory agreement between theoretically and experimentally obtained data. It is concluded that theoretically calculated point spread functions and their blurring effects in Panoramic Radiography give reliable results.

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