High Grade Glioma — Standard Approach, Obstacles and Future Directions

Joshi, Siddharth K.; Zuniga, Richard

doi:10.5772/58548

Cited by 1 publication

(1 citation statement)

References 48 publications

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“…Gliomas are very aggressive with no known cure, and only limited progress in disease control has been made in the last several decades [7]. Gliomas consist of astrocytomas, oligodendrogliomas, and a mix of the two (oligoastrocytomas), based on their histological appearance [8]. The World Health Organization classifies the severity of gliomas with a grading system, where grade I and II tumours are non-malignant and grades III and IV are malignant [9].…”

Section: Biology Of Gliomasmentioning

confidence: 99%

Improved Arterial Input Function For Dynamic Contrast-Enhanced Magnetic Resonance Imaging Using Phase and T1 Measurements

Majtenyi¹

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Perfusion is a bodily function that describes the transport of blood and nutrients to an organ. If characteristics of the blood flow to an organ can be measured, clinically useful quantitative data about the organ can be obtained. This is particularly useful in the diagnosis of tumours as their rapid and poorly-formed capillary network is unique compared to healthy tissue. Tumour perfusion information can be obtained by performing Dynamic Contrast-Enhanced (DCE)-MRI. Using DCE-MRI, blood flow into a tumour from a nearby artery can be computed by measuring the concentration of an injected contrast agent as a function of time. This measurement, known as the arterial input function (AIF), can be computed based on the change of either the intensity or the phase of the MR signal from the blood, due to the presence of a contrast agent. While both methods can be used to acquire the AIF, the change in phase is preferred due to its superior accuracy. Even so, the method conventionally used to obtain the phase-derived AIF has deficiencies that lead to an AIF intensity overestimation.The goal of this thesis was to determine a better method to obtain AIF data for patients with brain tumours by using a combination of MR signal phase and accurate T 1 relaxation measurements. This was done by first characterizing and deriving equations for phase measurement errors and simulating these effects on the AIF using realistic, clinical parameters. T 1 measurement methodology was developed and validated in staticiii water phantoms and applied to a flowing-water phantom system on which phase AIF data were also acquired. The novel AIF method was tested on this system before it was applied clinically to patients diagnosed with high-grade gliomas. The differences between the quantitative perfusion parameters from the new method and previous AIF methods were compared.The novel AIF measurement method presented in this thesis was designed to be less prone to experimental error than current clinical methods. Theoretical predictions, computed simulations, experimental work with MRI test objects, and clinical results all show that the new method for measuring the AIF is significantly superior to procedures currently used clinically. iv Table of Contents v List of Tables ix List of Illustrations xi List of Acronyms and Symbols xviList of Tables 3.

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Section: Biology Of Gliomasmentioning

confidence: 99%

Improved Arterial Input Function For Dynamic Contrast-Enhanced Magnetic Resonance Imaging Using Phase and T1 Measurements

Majtenyi¹

View full text Add to dashboard Cite

show abstract

High Grade Glioma — Standard Approach, Obstacles and Future Directions

Cited by 1 publication

References 48 publications

Improved Arterial Input Function For Dynamic Contrast-Enhanced Magnetic Resonance Imaging Using Phase and T1 Measurements

Improved Arterial Input Function For Dynamic Contrast-Enhanced Magnetic Resonance Imaging Using Phase and T1 Measurements

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