Frequency Volume Rendering of 3D Ultrasound Data for Liver Tissue Characterization
Date Issued
2007
Date
2007
Author(s)
Li, Wu-Jeng
DOI
zh-TW
Abstract
This research uses volume rendering as a tool for imaging 3D ultrasound data and the method used is ray casting. An important parameter is proposed in this research. It is called the central frequency of ultrasound echo signals which is used for rendering 3D ultrasound data. Then the liver tissue characterization and the change of the central frequency in the space domain are discussed under the condition that the liver tissue is affected by the alcohol.
In the first experiment, the statistics of the central frequency show that the variance coefficient of central frequency is relatively larger under the condition that the liver tissue is affected by the 10% alcohol than that the liver tissue have no alcohol to influence. The statistics of ultrasound amplitude show that the amplitude of the ultrasound echo signals is not a well parameter to distinguish the tiny difference of the liver tissue. It reveals that the parameter of central frequency is more sensitive than amplitude.
In the second experiment, a small lobe of liver is used as experimental phantom. The distribution of histogram of the central frequency is wider and the variance coefficient is larger when the liver tissue is affected by 10% alcohol.
In the third experiment, we take a large scan for liver lobe and discuss various rendering methods such as mean value, median, maximum, Distance to maximum, Center of gravity, and attenuated intensity etc. The optical image of cross sectional view of liver lobe is used to compare the region which is affected by alcohol. We find that the central frequency image in the affected region appears a lot of circle structure and it is very different with respect to mean or median value projection method.
Finally, we simulate ultrasound echo signals and see whether the central frequency changes under different simulating phantom of scattering density by using Field II software packages. The result shows that the density of scattering increases and the CV value of the central frequency has a trend of increase too. Their correlation coefficient is 0.7603 and it shows a high relationship.
Subjects
三維超音波
積體成像法
光線投擲
中心頻率
肝臟組織
3D ultrasound
volume rendering
ray casting
central frequency
liver tissue
Type
thesis
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