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Evaluation of resolution characteristics of digital intraoral radiographic images using a task transfer function

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Abstract

Objectives

This study aimed to quantitatively examine the effect of digital image processing of digital intraoral radiographic images on the resolution characteristics of the output image using a task transfer function (TTF).

Methods

A photostimulable phosphor system with three types of image processing filters, including periodontal, endodontic, and dentine-to-enamel junction filters, was used. Each filter can be used in conjunction with the sharpness filter (+ S). Images were obtained from the original phantom, which combined aluminum disk and plate. The TTF, which indicates the resolution characteristics, was calculated. A one-dimensional profile curve was also measured, and the fluctuation in the pixel value was evaluated in detail. The results were compared to investigate the effects of digital image processing on digital intraoral radiographic images.

Results

The TTF values were specific to each filter. The change in the TTF strongly reflected the characteristics of the one-dimensional profile curve. The TTF was compared with a one-dimensional profile curve and was able to quantitatively express the resolution characteristics of all directions in the image.

Conclusions

We attempted to evaluate the resolution characteristics of digital intraoral radiographic images with image processing filters using the TTF. The effect of each image processing filter and the + S filter on the resolution can be simply expressed using the TTF. Our results show that the TTF is useful for characterizing the resolution characteristics of image processing filters for image quality.

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Acknowledgements

The authors gratefully acknowledge the staff of the Department of Oral and Maxillofacial Radiology and Division of Radiology at Kyushu University Hospital for their valuable clinical support. The authors also wish to thank Jun Ito of Trophy Radiology Japan for his assistance with this study. This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Authors and Affiliations

  1. Department of Radiological Technology, Faculty of Health Sciences, Kobe Tokiwa University, 2-6-2 Otanicho, Nagata-ku, Kobe, 653-0838, Japan

    Taku Kuramoto

  2. Division of Radiology, Department of Medical Technology, Kyushu University Hospital, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan

    Shinya Takarabe, Hiroki Tsuru, Yusuke Shibayama & Toyoyuki Kato

  3. Department of Oral and Maxillofacial Radiology, Faculty of Dental Science, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan

    Shinya Takarabe & Kazunori Yoshiura

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  1. Taku Kuramoto
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  2. Shinya Takarabe
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  3. Hiroki Tsuru
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  4. Yusuke Shibayama
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  5. Toyoyuki Kato
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  6. Kazunori Yoshiura
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Correspondence to Shinya Takarabe.

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Kuramoto, T., Takarabe, S., Tsuru, H. et al. Evaluation of resolution characteristics of digital intraoral radiographic images using a task transfer function. Oral Radiol 38, 638–644 (2022). https://doi.org/10.1007/s11282-022-00633-y

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  • DOI: https://doi.org/10.1007/s11282-022-00633-y

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