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
Yusuke InoueHiroki Haradome

Abstract

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. 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. 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. 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 graysca...Continue Reading

References

Nov 26, 1999·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·L G Nyúl, J K Udupa
Nov 27, 2007·Magnetic Resonance in Medical Sciences : MRMS : an Official Journal of Japan Society of Magnetic Resonance in Medicine·Makoto SasakiMieko Matsui
Feb 10, 2009·Academic Radiology·Toshinori HiraiUNKNOWN Acute Stroke Imaging Standardization Group-Japan (ASIST-Japan) Investigators
Oct 1, 2011·Journal of Magnetic Resonance Imaging : JMRI·Hiroki HaradomeTaro Takaraha
Jun 26, 2013·AJR. American Journal of Roentgenology·Christoph J ZechClaude B Sirlin
Jul 22, 2017·Japanese Journal of Radiology·Toshimasa HaraHirofumi Hata

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