Quantitative Evaluation of Display Contrast of Gd-EOB-DTPA-Enhanced Magnetic Resonance Images: Effects of the Flip Angle and Grayscale Gamma Value
Joint Authors
Inoue, Yusuke
Hata, Hirofumi
Nakajima, Ai
Matsunaga, Keiji
Ohzeki, Yusuke
Hashimoto, Tetsuya
Haradome, Hiroki
Source
Radiology Research and Practice
Issue
Vol. 2019, Issue 2019 (31 Dec. 2019), pp.1-6, 6 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2019-01-16
Country of Publication
Egypt
No. of Pages
6
Main Subjects
Abstract EN
Introduction.
Display contrast can be changed nonlinearly by manipulating the gamma value of the grayscale.
We investigated the contrast of the hepatobiliary-phase images acquired with different flip angles (FAs) and displayed with different gamma values in Gd-EOB-DTPA-enhanced magnetic resonance imaging.
Material and Methods.
Twenty patients with liver tumors were studied.
Hepatobiliary-phase images were acquired at low (12°) and high (30°) FAs.
Low-FA images were converted to simulate images displayed with different gamma values, using ImageJ software.
To assess image contrast, the liver-to-muscle signal ratio (LMR), liver-to-spleen signal ratio (LSR), contrast ratio (CR), liver signal-to-noise ratio (SNR), and contrast-to-noise ratio (CNR) were calculated.
Results.
The LMR, LSR, and CR were higher in the high-FA images than in the low-FA original images.
Although the SNR was lower in the high-FA images, indicating an increase in noise, the CNR was higher.
Raising the gamma value increased the LMR, LSR, and CR, notably decreased the SNR, and slightly decreased the CNR.
Conclusion.
Increasing the FA enhanced image contrast, supporting its usefulness for improving the delineation of focal liver lesions.
Although the associated increase in noise may be problematic, raising the grayscale gamma value enhances the display contrast of low-FA images.
American Psychological Association (APA)
Inoue, Yusuke& Hata, Hirofumi& Nakajima, Ai& Matsunaga, Keiji& Ohzeki, Yusuke& Hashimoto, Tetsuya…[et al.]. 2019. Quantitative Evaluation of Display Contrast of Gd-EOB-DTPA-Enhanced Magnetic Resonance Images: Effects of the Flip Angle and Grayscale Gamma Value. Radiology Research and Practice،Vol. 2019, no. 2019, pp.1-6.
https://search.emarefa.net/detail/BIM-1207583
Modern Language Association (MLA)
Inoue, Yusuke…[et al.]. Quantitative Evaluation of Display Contrast of Gd-EOB-DTPA-Enhanced Magnetic Resonance Images: Effects of the Flip Angle and Grayscale Gamma Value. Radiology Research and Practice No. 2019 (2019), pp.1-6.
https://search.emarefa.net/detail/BIM-1207583
American Medical Association (AMA)
Inoue, Yusuke& Hata, Hirofumi& Nakajima, Ai& Matsunaga, Keiji& Ohzeki, Yusuke& Hashimoto, Tetsuya…[et al.]. Quantitative Evaluation of Display Contrast of Gd-EOB-DTPA-Enhanced Magnetic Resonance Images: Effects of the Flip Angle and Grayscale Gamma Value. Radiology Research and Practice. 2019. Vol. 2019, no. 2019, pp.1-6.
https://search.emarefa.net/detail/BIM-1207583
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1207583