Simultaneous achievement of accurate CT number and image quality improvement for myocardial perfusion CT at 320-MDCT volume scanning

Yoshinori Funama, Katsuyuki Taguchi, Daisuke Utsunomiya, Seitaro Oda, Toshiaki Shimonobo, Hideaki Yuki, Masafumi Kidoh, Yasuyuki Yamashita

Research output: Contribution to journalArticle

Abstract

Purpose: To investigate differences in image-to-image variations between full- and half-scan reconstruction on myocardial CT perfusion (CTP) study.Methods: Using a cardiac phantom we performed ECG-gated myocardial CTP on a second-generation 320-multidetector CT volume scanner. The heart rate was set at 60 bpm; once per second for a total of 24 s were performed. CT images were acquired at 80- and 120 kVp and subjected to full- and half-scan reconstruction. On images acquired at the same slice level we then measured image-to-image variations, coefficients of variance (CV), and image noise.Results: The image-to-image variations with full- and half-scan reconstruction were 1.3 HU vs. 27.2 HU at 80 kVp (p <0.001) and 0.70 HU vs. 9.3 HU at 120 kVp (p <0.001) even though the mean HU value was almost the same for both reconstruction methods. The CV of 80- and 120-kVp images of the left ventricular cavity decreased by 0.16% and 0.17%, respectively, with full-scan reconstruction; with half-scan reconstruction it decreased by 3.34% and 2.30%, respectively. Compared with half-scan reconstruction, the image noise was reduced by 27.2% at 80 kVp and by 28.0% at 120 kVp with full-scan reconstruction.Conclusion: Myocardial CTP with full-scan reconstruction substantially decreased image-to-image variations and provided accurate CT attenuation.

Original languageEnglish (US)
Pages (from-to)702-707
Number of pages6
JournalPhysica Medica
Volume31
Issue number7
DOIs
StatePublished - Nov 1 2015

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Quality Improvement
Perfusion
scanning
Cone-Beam Computed Tomography
Computer-Assisted Image Processing
Electrocardiography
Heart Rate
heart rate
coefficients
scanners
attenuation

Keywords

  • 320-Detector volume scanner
  • Full-scan reconstruction
  • Half-scan reconstruction
  • Image-to-image variation
  • Myocardial CT perfusion

ASJC Scopus subject areas

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

Cite this

Simultaneous achievement of accurate CT number and image quality improvement for myocardial perfusion CT at 320-MDCT volume scanning. / Funama, Yoshinori; Taguchi, Katsuyuki; Utsunomiya, Daisuke; Oda, Seitaro; Shimonobo, Toshiaki; Yuki, Hideaki; Kidoh, Masafumi; Yamashita, Yasuyuki.

In: Physica Medica, Vol. 31, No. 7, 01.11.2015, p. 702-707.

Research output: Contribution to journalArticle

Funama, Yoshinori ; Taguchi, Katsuyuki ; Utsunomiya, Daisuke ; Oda, Seitaro ; Shimonobo, Toshiaki ; Yuki, Hideaki ; Kidoh, Masafumi ; Yamashita, Yasuyuki. / Simultaneous achievement of accurate CT number and image quality improvement for myocardial perfusion CT at 320-MDCT volume scanning. In: Physica Medica. 2015 ; Vol. 31, No. 7. pp. 702-707.
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abstract = "Purpose: To investigate differences in image-to-image variations between full- and half-scan reconstruction on myocardial CT perfusion (CTP) study.Methods: Using a cardiac phantom we performed ECG-gated myocardial CTP on a second-generation 320-multidetector CT volume scanner. The heart rate was set at 60 bpm; once per second for a total of 24 s were performed. CT images were acquired at 80- and 120 kVp and subjected to full- and half-scan reconstruction. On images acquired at the same slice level we then measured image-to-image variations, coefficients of variance (CV), and image noise.Results: The image-to-image variations with full- and half-scan reconstruction were 1.3 HU vs. 27.2 HU at 80 kVp (p <0.001) and 0.70 HU vs. 9.3 HU at 120 kVp (p <0.001) even though the mean HU value was almost the same for both reconstruction methods. The CV of 80- and 120-kVp images of the left ventricular cavity decreased by 0.16{\%} and 0.17{\%}, respectively, with full-scan reconstruction; with half-scan reconstruction it decreased by 3.34{\%} and 2.30{\%}, respectively. Compared with half-scan reconstruction, the image noise was reduced by 27.2{\%} at 80 kVp and by 28.0{\%} at 120 kVp with full-scan reconstruction.Conclusion: Myocardial CTP with full-scan reconstruction substantially decreased image-to-image variations and provided accurate CT attenuation.",
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AU - Funama, Yoshinori

AU - Taguchi, Katsuyuki

AU - Utsunomiya, Daisuke

AU - Oda, Seitaro

AU - Shimonobo, Toshiaki

AU - Yuki, Hideaki

AU - Kidoh, Masafumi

AU - Yamashita, Yasuyuki

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N2 - Purpose: To investigate differences in image-to-image variations between full- and half-scan reconstruction on myocardial CT perfusion (CTP) study.Methods: Using a cardiac phantom we performed ECG-gated myocardial CTP on a second-generation 320-multidetector CT volume scanner. The heart rate was set at 60 bpm; once per second for a total of 24 s were performed. CT images were acquired at 80- and 120 kVp and subjected to full- and half-scan reconstruction. On images acquired at the same slice level we then measured image-to-image variations, coefficients of variance (CV), and image noise.Results: The image-to-image variations with full- and half-scan reconstruction were 1.3 HU vs. 27.2 HU at 80 kVp (p <0.001) and 0.70 HU vs. 9.3 HU at 120 kVp (p <0.001) even though the mean HU value was almost the same for both reconstruction methods. The CV of 80- and 120-kVp images of the left ventricular cavity decreased by 0.16% and 0.17%, respectively, with full-scan reconstruction; with half-scan reconstruction it decreased by 3.34% and 2.30%, respectively. Compared with half-scan reconstruction, the image noise was reduced by 27.2% at 80 kVp and by 28.0% at 120 kVp with full-scan reconstruction.Conclusion: Myocardial CTP with full-scan reconstruction substantially decreased image-to-image variations and provided accurate CT attenuation.

AB - Purpose: To investigate differences in image-to-image variations between full- and half-scan reconstruction on myocardial CT perfusion (CTP) study.Methods: Using a cardiac phantom we performed ECG-gated myocardial CTP on a second-generation 320-multidetector CT volume scanner. The heart rate was set at 60 bpm; once per second for a total of 24 s were performed. CT images were acquired at 80- and 120 kVp and subjected to full- and half-scan reconstruction. On images acquired at the same slice level we then measured image-to-image variations, coefficients of variance (CV), and image noise.Results: The image-to-image variations with full- and half-scan reconstruction were 1.3 HU vs. 27.2 HU at 80 kVp (p <0.001) and 0.70 HU vs. 9.3 HU at 120 kVp (p <0.001) even though the mean HU value was almost the same for both reconstruction methods. The CV of 80- and 120-kVp images of the left ventricular cavity decreased by 0.16% and 0.17%, respectively, with full-scan reconstruction; with half-scan reconstruction it decreased by 3.34% and 2.30%, respectively. Compared with half-scan reconstruction, the image noise was reduced by 27.2% at 80 kVp and by 28.0% at 120 kVp with full-scan reconstruction.Conclusion: Myocardial CTP with full-scan reconstruction substantially decreased image-to-image variations and provided accurate CT attenuation.

KW - 320-Detector volume scanner

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KW - Image-to-image variation

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