A newly-developed metal artifact reduction algorithm improves the visibility of oral cavity lesions on 320-MDCT volume scans

Yoshinori Funama, Katsuyuki Taguchi, Daisuke Utsunomiya, Seitaro Oda, Kenichiro Hirata, Hideaki Yuki, Masafumi Kidoh, Masahiro Hatemura, Yasuyuki Yamashita

Research output: Contribution to journalArticle

Abstract

Purpose: To investigate whether a newly-developed single-energy metal artifact reduction (SEMAR) algorithm applied to images acquired on a 320-MDCT volume scanner reduces image artifacts from dental metal. Methods: We inserted the lower right teeth covered with a dental metal alloy and crown in a skull phantom and performed single-volume scanning on a second-generation 320-MDCT scanner. A 12-mm diameter spherical lesion was placed either close to or far from the dental metal. The tube voltage and current were 120kVp and 80 or 155mA, respectively. Images were reconstructed with filtered back projection (FBP) or iterative reconstruction (IR), with or without SEMAR. We calculated the signal-to-artifact ratios (SAR) to quantify the visibility of the lesion. Two radiologists inspected 96 images (48 with lesion and 48 without) for the presence or absence of the lesion using a 5-point ordinal scale (1=definitely absent to 5=definitely present). Results: On images reconstructed with FPB and IR with SEMAR, streak artifacts from the dental metal were reduced substantially compared to images without SEMAR. At 155mA with the lesion near the dental metal, the SARs were better on FBP and IR images (FBP: 1.7 and 0.5 with and without SEMAR, respectively; IR: 1.6 and 0.9 with and without SEMAR, respectively). The observer visual scores improved with SEMAR (FBP: 4.2 and 3.2 with and without SEMAR, respectively; IR: 4.2 and 3.0). Conclusion: The SEMAR algorithm reduces dental metal artifacts and improves lesion detectability and image quality in patients with oral cavity lesions.

Original languageEnglish (US)
Pages (from-to)66-71
Number of pages6
JournalPhysica Medica
Volume31
Issue number1
DOIs
StatePublished - 2015

Fingerprint

visibility
Artifacts
lesions
Mouth
artifacts
Metals
cavities
metals
Tooth
projection
energy
scanners
Dental Alloys
Tooth Crown
skull
Computer-Assisted Image Processing
teeth
image reconstruction
Crowns
Skull

Keywords

  • 320-detector volume scanner
  • Artifacts
  • Oral cavity lesion
  • Single-energy metal artifact reduction (SEMAR)

ASJC Scopus subject areas

  • Biophysics
  • Radiology Nuclear Medicine and imaging
  • Physics and Astronomy(all)
  • Medicine(all)

Cite this

A newly-developed metal artifact reduction algorithm improves the visibility of oral cavity lesions on 320-MDCT volume scans. / Funama, Yoshinori; Taguchi, Katsuyuki; Utsunomiya, Daisuke; Oda, Seitaro; Hirata, Kenichiro; Yuki, Hideaki; Kidoh, Masafumi; Hatemura, Masahiro; Yamashita, Yasuyuki.

In: Physica Medica, Vol. 31, No. 1, 2015, p. 66-71.

Research output: Contribution to journalArticle

Funama, Y, Taguchi, K, Utsunomiya, D, Oda, S, Hirata, K, Yuki, H, Kidoh, M, Hatemura, M & Yamashita, Y 2015, 'A newly-developed metal artifact reduction algorithm improves the visibility of oral cavity lesions on 320-MDCT volume scans', Physica Medica, vol. 31, no. 1, pp. 66-71. https://doi.org/10.1016/j.ejmp.2014.10.003
Funama, Yoshinori ; Taguchi, Katsuyuki ; Utsunomiya, Daisuke ; Oda, Seitaro ; Hirata, Kenichiro ; Yuki, Hideaki ; Kidoh, Masafumi ; Hatemura, Masahiro ; Yamashita, Yasuyuki. / A newly-developed metal artifact reduction algorithm improves the visibility of oral cavity lesions on 320-MDCT volume scans. In: Physica Medica. 2015 ; Vol. 31, No. 1. pp. 66-71.
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