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Comparison of the performance of intraoral X-ray sensors using objective image quality assessment

Published:August 27, 2016DOI:https://doi.org/10.1016/j.oooo.2016.08.014
      In reply:
      This letter is in response to the comments from Drs. Mah and Udupa regarding our article “Comparison of the performance of intraoral X-ray sensors using objective image quality assessment.” We are grateful for their comments and appreciate their careful reading of our paper.
      In the paper we claim, “Furthermore, no studies comparing sensors of different models, using objective quantification of key image quality parameters, could be found in the literature.”
      • Hellén-Halme K.
      • Johansson C.
      • Nilsson M.
      Comparison of the performance of intraoral X-ray sensors using objective image quality assessment.
      Taking the comments from Drs. Mah and Udupa into consideration,
      • Mah P.
      • Udupa H.
      Response to the article “Comparison of the performance of intraoral X-ray sensors using objective image quality assessment”.
      we still believe that this is true. This is a consequence of our definition of objective methods, as expressed in the beginning of the discussion: “The results obtained using objective methods are produced by mathematical algorithms applied directly to image data and do not rely on the subjective assessment of image quality by radiologists.”
      • Hellén-Halme K.
      • Johansson C.
      • Nilsson M.
      Comparison of the performance of intraoral X-ray sensors using objective image quality assessment.
      This means that no viewing of quality assurance (QA) images or assessment of graphs is done by a human observer. All QA data produced come from direct analysis of the digital image data, and there is no human interpretation of the results.
      In references 2, 3, 5, and 6 in Drs. Mah and Udupa's letter,
      • Mah P.
      • Udupa H.
      Response to the article “Comparison of the performance of intraoral X-ray sensors using objective image quality assessment”.
      evaluation and interpretation of QA results is consequently done by human observers. In our opinion, such QA methods are based on subjective evaluation and interpretation. We have not been able to find reference no. 4, as this obviously is in the proceedings of a conference and is not a published paper.
      In summary, we and Drs. Mah and Udupa evidently do not have the same opinion as to the meaning of the concept objective QA methods.
      Sincerely yours,

      References

        • Hellén-Halme K.
        • Johansson C.
        • Nilsson M.
        Comparison of the performance of intraoral X-ray sensors using objective image quality assessment.
        Oral Surg Oral Med Oral Pathol Oral Radiol. 2016; 121: e129-e137
        • Mah P.
        • Udupa H.
        Response to the article “Comparison of the performance of intraoral X-ray sensors using objective image quality assessment”.
        Oral Surg Oral Med Oral Pathol Oral Radiol. 2016; 121: e129-e137

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