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      • Record: found
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      Image Resolution in the Digital Era: Notion and Clinical Implications

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          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          Digital radiographs need additional metadata in order to be accurate when being converted to analog media. Resolution is a major reason of failures in proper printing or digitizing the images. This letter shortly explains the overlooked pitfalls of digital radiography and photography in dental practice, and briefly instructs the reader how to avoid or rectify common problems associated with resolution calibration of digital radiographs.

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          Modulation transfer function evaluation of cone beam computed tomography for dental use with the oversampling method.

          T Kurabayashi, Hisashi Watanabe, E. Honda (2009)
          The aim was to investigate the possibility of evaluating the modulation transfer function (MTF) of cone beam CT (CBCT) for dental use using the oversampling method. The CBCT apparatus (3D Accuitomo) with an image intensifier was used with a 100 mum tungsten wire placed inside the scanner at a slight angle to the plane perpendicular to the plane of interest and scanned. 200 contiguous reconstructed images were used to obtain the oversampling line-spread function (LSF). The MTF curve was obtained by computing the Fourier transformation from the oversampled LSF. Line pair tests were also performed using Catphan(R). The oversampling method provided smooth and reproducible MTF curves. The MTF curves revealed that the spatial resolution in the z-axis direction was significantly higher than that in the axial direction. This result was also confirmed by the line pair test. MTF analysis was performed successfully using the oversampling method. In addition, this study clarified that the 3D Accuitomo had high spatial resolution, especially in the z-axis direction.
          Article 0 comments Cited 8 times – based on 0 reviews     Review now
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            Developing an automatic lateral cephalometric landmark identification program and evaluating its performance.

            V Rakhshan, H Rakhshan, A Sheibaninia (2008)
            To evaluate the accuracy of detecting cephalometric landmarks automatically by computer. Digital image processing algorithms (edge-based and morphological) in addition to mathematical algorithms (knowledge-based) were used to develop a program for the identification of 15 lateral cephalometric landmarks on digital cephalograms. The automatic landmark identification system was clinically acceptable (p > 0.05 comparing with 2-mm error range) for five landmarks. The automatic landmark identification is accurate for only some landmarks. Additional studies may be necessary to improve this method.
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              Effects of scintillator on the modulation transfer function (MTF) of a digital imaging system.

              Richard A. Lempicki, Allan G. Farman, J Pajak … (2005)
              To investigate the effects of 2 components (scintillator and x-ray generator) in the imaging chain on the modulation transfer function (MTF) of a charge-coupled device (CCD) digital intraoral radiographic system. Three screens composed of 3 different scintillator materials, namely europium-doped lutetium oxide transparent optical ceramic (TOC), thallium-doped cesium iodide (CsI), and terbium-doped gadolinium oxysulfide (GOS), were compared. Each was used, in turn, in conjunction with a CCD detector having a pixel dimension of 19.5 mum. Two different x-ray generators were also used to evaluate this variable. MTF was investigated using the slanted slit method. The TOC provided a good modulation response for low and middle frequencies, reducing to 0 only at a high cutoff frequency. With CsI and GOS, the system MTF dropped to 0 at a lower cutoff frequency than was the case with TOC. Hence, TOC provided higher spatial resolution than the other 2 scintillators tested under the experimental conditions applied. The differences in MTF attributed to the scintillator type were proportional and consistent. Despite constant pixel dimensions, MTF was affected to a considerable degree by the scintillator applied and the x-ray generator used in conjunction with the same CCD imaging device. TOC shows potential as a possible replacement for CsI and GOS as a scintillator screen material for intraoral digital x-ray imaging using a solid-state detector, providing higher spatial resolution under the given experimental conditions.
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                Author and article information

                Journal
                Journal ID (nlm-ta): J Dent (Shiraz)
                Journal ID (iso-abbrev): J Dent (Shiraz)
                Journal ID (publisher-id): JDS
                Title: Journal of Dentistry
                Publisher: Shiraz University of Medical Sciences (Shiraz, Iran )
                ISSN (Print): 2345-6485
                ISSN (Electronic): 2345-6418
                Publication date (Print): December 2014
                Volume: 15
                Issue: 4
                Pages: 153-155
                Affiliations
                [1] Iranian Tissue Bank and Research Center, Tehran University of Medical Sciences, Dept. of Dental Anatomy and Morphology, Dental Branch, Islamic Azad University, Tehran, Iran.
                Author notes
                Correspondence: Vahid Rakhshan, #22 Behruzi Alley, Karegar St. Tehran, Iran. PO.Box: 14188-36783 Tel: +98-21-66929055 Email: v_rakhshan@dentaliau.ac.ir
                Article
                Publisher ID: jds-15-153
                PMC ID: 4247836
                SO-VID: eb124466-9bd9-4eca-adb7-0d2b14197f6b
                Copyright © © 2014: Journal of dentistry (Shiraz)
                License:

                This is an Open Access article distributed under the terms of the Creative Commons Attribution License, ( http://creativecommons.org/licenses/by/3.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                Date received : February 2014
                Date received : April 2014
                Date accepted : May 2014
                Categories
                Subject: Letter to Editor

                Keywords: dental imaging,computerized imaging,dpi resolution,spatial resolution,calibration
                Data availability:
                Keywords: dental imaging, computerized imaging, dpi resolution, spatial resolution, calibration

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