The Experts below are selected from a list of 24717 Experts worldwide ranked by ideXlab platform

Rieko Nishimura - One of the best experts on this subject based on the ideXlab platform.

Andrew Joiner - One of the best experts on this subject based on the ideXlab platform.

  • The in vitro and in vivo reproducibility of a video-based Digital Imaging System for tooth colour measurement.
    Journal of Dentistry, 2017
    Co-Authors: Mojgan Naeeni, Suzanne M. Platten, Jinfang Wang, Stephen Westland, Andrew Joiner
    Abstract:

    Abstract Objectives To assess the robustness of a new custom built video-based Digital Imaging System (VDIS) for measuring tooth colour and whiteness under in vitro and in vivo conditions. Methods The VDIS Imaging System was developed for tooth colour measurement and evaluated in vitro and in vivo. The in vitro validation used extracted human teeth (HT, n = 14) stored in water and VITA Classical shade guide tabs (SG, n = 16). These were measured by the VDIS at baseline, 5 min, 2 h, 1 week and 2 weeks to evaluate the System repeatability. For in vivo validation, adult volunteers (male/female, n = 34) with two natural, unrestored central incisors had their teeth imaged using the VDIS at baseline, 5 min and 2 h (3 images each) by two different operators to evaluate time and operator effects. Between taking individual images, subjects moved from the Imaging-frame to assess the effect of re-positioning on reproducibility. From the in vitro and in vivo images, the average tooth RGB values were obtained, and the CIELAB values and a tooth whiteness index WIO value were calculated. Repeatability and reproducibility of VDIS Imaging System was assessed using appropriate repeated measurement analysis techniques and ANOVA. Results The measurement variations in vitro were between 1 and 2 units of ΔWIO and the average colour differences were less than 1 ΔE*ab unit. For the in vivo study, analysis of the CIELAB parameters and WIO showed that subject variability accounted for between 82 and 99% of the observed variability in the measurement process. The operator variability was less than 0.5% and the overall measurement error was found to be only 0.3% for WIO. Across assessment times the variability was less than 0.5%. Conclusions The dental Imaging System V-DIS was shown to be a highly reproducible means for tooth colour and whiteness measurement. Clinical significance Digital Imaging based techniques gives a highly reproducible approach to measuring tooth colour.

  • The in vitro and in vivo reproducibility of a video-based Digital Imaging System for tooth colour measurement.
    Journal of dentistry, 2017
    Co-Authors: Wen Luo, Mojgan Naeeni, Suzanne M. Platten, Jinfang Wang, Stephen Westland, Jianing N Sun, Andrew Joiner
    Abstract:

    To assess the robustness of a new custom built video-based Digital Imaging System (VDIS) for measuring tooth colour and whiteness under in vitro and in vivo conditions. The VDIS Imaging System was developed for tooth colour measurement and evaluated in vitro and in vivo. The in vitro validation used extracted human teeth (HT, n=14) stored in water and VITA Classical shade guide tabs (SG, n=16). These were measured by the VDIS at baseline, 5min, 2h, 1 week and 2 weeks to evaluate the System repeatability. For in vivo validation, adult volunteers (male/female, n=34) with two natural, unrestored central incisors had their teeth imaged using the VDIS at baseline, 5min and 2h (3 images each) by two different operators to evaluate time and operator effects. Between taking individual images, subjects moved from the Imaging-frame to assess the effect of re-positioning on reproducibility. From the in vitro and in vivo images, the average tooth RGB values were obtained, and the CIELAB values and a tooth whiteness index WIO value were calculated. Repeatability and reproducibility of VDIS Imaging System was assessed using appropriate repeated measurement analysis techniques and ANOVA. The measurement variations in vitro were between 1 and 2 units of ΔWIO and the average colour differences were less than 1 ΔE*ab unit. For the in vivo study, analysis of the CIELAB parameters and WIO showed that subject variability accounted for between 82 and 99% of the observed variability in the measurement process. The operator variability was less than 0.5% and the overall measurement error was found to be only 0.3% for WIO. Across assessment times the variability was less than 0.5%. The dental Imaging System V-DIS was shown to be a highly reproducible means for tooth colour and whiteness measurement. Digital Imaging based techniques gives a highly reproducible approach to measuring tooth colour. Copyright © 2017 Elsevier Ltd. All rights reserved.

  • The in vitro and in vivo validation of a mobile non-contact camera-based Digital Imaging System for tooth colour measurement.
    Journal of dentistry, 2008
    Co-Authors: Richard N Smith, Mojgan Naeeni, Andrew Joiner, Luisa Z Collins, Carole J Philpotts, Ian Hopkinson, Clare Jones, Darren L Lath, Thomas Coxon, James Hibbard
    Abstract:

    To assess the reproducibility of a mobile non-contact camera-based Digital Imaging System (DIS) for measuring tooth colour under in vitro and in vivo conditions. One in vitro and two in vivo studies were performed using a mobile non-contact camera-based Digital Imaging System. In vitro study: two operators used the DIS to image 10 dry tooth specimens in a randomised order on three occasions. In vivo study 1:25 subjects with two natural, normally aligned, upper central incisors had their teeth imaged using the DIS on four consecutive days by one operator to measure day-to-day variability. On one of the four test days, duplicate images were collected by three different operators to measure inter- and intra-operator variability. In vivo study 2:11 subjects with two natural, normally aligned, upper central incisors had their teeth imaged using the DIS twice daily over three days within the same week to assess day-to-day variability. Three operators collected images from subjects in a randomised order to measure inter- and intra-operator variability. Subject-to-subject variability was the largest source of variation within the data. Pairwise correlations and concordance coefficients were > 0.7 for each operator, demonstrating good precision and excellent operator agreement in each of the studies. Intraclass correlation coefficients (ICCs) for each operator indicate that day-to-day reliability was good to excellent, where all ICC's where > 0.75 for each operator. The mobile non-contact camera-based Digital Imaging System was shown to be a reproducible means of measuring tooth colour in both in vitro and in vivo experiments.

  • the in vitro and in vivo validation of a mobile non contact camera based Digital Imaging System for tooth colour measurement
    Journal of Dentistry, 2008
    Co-Authors: Richard N Smith, Mojgan Naeeni, Andrew Joiner, Luisa Z Collins, Carole J Philpotts, Ian Hopkinson, Clare Jones, Darren L Lath, Thomas Coxon, James Hibbard
    Abstract:

    Objective: To assess the reproducibility of a mobile non-contact camera-based Digital Imaging System (DIS) for measuring tooth colour under in vitro and in vivo conditions. Methods: One in vitro and two in vivo studies were performed using a mobile non-contact camera-based Digital Imaging System. In vitro study: two operators used the DIS to image 10 dry tooth specimens in a randomised order on three occasions. In vivo study 1: 25 subjects with two natural, normally aligned, upper central incisors had their teeth imaged using the DIS on four consecutive days by one operator to measure day-to-day variability. On one of the four test days, duplicate images were collected by three different operators to measure inter- and intra-operator variability. In vivo study 2: 11 subjects with two natural, normally aligned, upper central incisors had their teeth imaged using the DIS twice daily over three days within the same week to assess day-to-day variability. Three operators collected images from subjects in a randomised orderto measure inter- and intra-operator variability. Results: Subject-to-subject variability was the largest source of variation within the data. Pairwise correlations and concordance coefficients were >0.7 for each operator, demonstrating good precision and excellent operator agreement in each of the studies. Intraclass correlation coefficients (ICCs) for each operator indicate that day-to-day reliability was good to excellent, where all ICC’s where >0.75 for each operator. Conclusion: The mobilenon-contact camera-based Digital Imaging Systemwas shown to be a reproducible means of measuring tooth colour in both in vitro and in vivo experiments.

Shozo Ohsumi - One of the best experts on this subject based on the ideXlab platform.

Chris Y Wu - One of the best experts on this subject based on the ideXlab platform.

  • teleradiology telepathology requirements and implementation
    Journal of Medical Systems, 1995
    Co-Authors: Al M Elsayed, Walid Gabriel Tohme, Chris Y Wu
    Abstract:

    Teleradiology and telepathology form an integral part of the telemedicine concept. Teleradiology is becoming a mature technology because of advances in Imaging technology, database design and communications infrastructure and capabilities. Telepathology has also made significant progress but more development is needed in the definition of required images, database design and standards. While the requirements of most clinical applications of teleradiology are well established, telemammography still presents some impediments. Technical difficulties in telemammography are presented in terms of the lack of a clinically accepted Digital Imaging System and large data volume required per image. Another important aspect in tele-Imaging is the database question. Workstations constitute a window into database. Comprehensive database development is the most difficult and expensive technology for tele-Imaging and operational features of such Systems are discussed. Finally, we explore current examples of the use of telepathology and teleradiology in the global telemedicine context.

Sachiko Kiyoto - One of the best experts on this subject based on the ideXlab platform.