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Hemodynamic investigation of the liver using magnetic resonance imaging and computational fluid dynamics.

機譯：使用磁共振成像和計算流體力學研究肝臟的血液動力學。

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摘要

Cirrhosis is a leading cause of death in the United States and has severe and costly complications. Because of the clinical significance of cirrhosis, it is important that noninvasive methods be developed to detect cirrhosis early and to monitor its progression with advancing liver disease. Previous studies on portal venous hemodynamics have been performed mainly with ultrasound with mixed results. Magnetic Resonance Imaging offers several advantages over ultrasound including acquisition of both high quality anatomical and hemodynamic information. Phase-Contrast MR was used to gather velocity data for the portal venous system. Methods were developed to perform registration, segmentation and isolation of the portal vein geometries and velocity data. Computational Fluid Dynamics was also employed to further investigate the flow within the portal vein. Velocity data for the portal vein, superior mesenteric vein, splenic vein and the right or left portal vein were acquired in varying numbers for both data sets. Even with the limited number of subjects a few parameters were significant. Patients with cirrhosis had a significantly increased portal vein area and a significantly decreased average velocity per liver volume and velocity variance. Patients with cirrhosis had a significantly increased splenic vein area and average flow rate per liver volume. While these results are preliminary due to small sample size, they are promising and require further investigation and more subjects including varying stages of disease.
機譯：肝硬化是美國的主要死亡原因，并具有嚴重且代價高昂的并發(fā)癥。由于肝硬化的臨床意義，重要的是開發(fā)非侵入性方法，以及早發(fā)現(xiàn)肝硬化并監(jiān)測其隨著肝臟疾病的進展。先前有關門靜脈血流動力學的研究主要是通過超聲進行的，結果不一。磁共振成像比超聲具有幾個優(yōu)勢，包括獲取高質(zhì)量的解剖和血液動力學信息。相襯MR用于收集門靜脈系統(tǒng)的速度數(shù)據(jù)。開發(fā)了用于進行門靜脈幾何形狀和速度數(shù)據(jù)的配準，分割和隔離的方法。計算流體動力學還被用來進一步研究門靜脈內(nèi)的血流。對于這兩個數(shù)據(jù)集，以不同數(shù)量獲取門靜脈，腸系膜上靜脈，脾靜脈以及左右門靜脈的速度數(shù)據(jù)。即使對象數(shù)量有限，一些參數(shù)仍然很重要。肝硬化患者的門靜脈面積顯著增加，每肝體積的平均速度和速度變化顯著降低。肝硬化患者的脾靜脈面積和每肝體積的平均流速顯著增加。盡管由于樣本量小，這些結果是初步的，但它們是有希望的，需要進一步研究，需要更多受試者，包括不同階段的疾病。

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  • 作者

    George, Stephanie M.;

  • 作者單位

    Georgia Institute of Technology.;

  • 授予單位 Georgia Institute of Technology.;
  • 學科 Engineering Biomedical.
  • 學位 Ph.D.
  • 年度 2008
  • 頁碼 166 p.
  • 總頁數(shù) 166
  • 原文格式 PDF
  • 正文語種 eng
  • 中圖分類
  • 關鍵詞

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