THE ASSESSMENT OF STRUCTURAL CHANGES IN MS PLAQUES AND NORMAL APPEARING WHITE MATTER USING QUANTITATIVE MAGNETIZATION TRANSFER IMAGING (MTI)

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FOOLADI MASOOMEH; RIAHI ALAM NADER; HARIRCHYAN MOHAMMAD HOSSEIN; FIRUZNIA KAVOOS; OGHABIAN MOHAMMAD ALI; SHAKIBA MAJID; RAFIEE BEHROOZ; BAKHTIARY MORTEZA

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Journal: IRANIAN JOURNAL OF MEDICAL PHYSICS Year:2008 | Volume:4 | Issue:2 (16-17) Page(s): 53-64

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Title

THE ASSESSMENT OF STRUCTURAL CHANGES IN MS PLAQUES AND NORMAL APPEARING WHITE MATTER USING QUANTITATIVE MAGNETIZATION TRANSFER IMAGING (MTI)

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Keywords

MULTIPLE SCLEROSISQ2

QUANTITATIVE MAGNETIZATION TRANSFER IMAGING (QMTI)Q3

MAGNETIZATION TRANSFER RATIO (MTR)Q3

LESIONQ2

BRAIN WHITE MATTERQ3

Abstract

Introduction: MULTIPLE SCLEROSIS (MS) is a demyelinating disease of the central nervous system (CNS), affecting mostly young people at a mean age of 30 years. Magnetic resonance imaging (MRI) is one of the most specific and sensitive methods in diagnosing and detecting the evolution of MULTIPLE SCLEROSIS disease. But it does not have the ability to differentiate between distinct histopathological heterogeneities that occur in MS LESIONs and brain tissue. Quantitative magnetization transfer imaging (qMTI) is a relatively new MRI technique which can be used to examine the pathological processes of the brain parenchyma which occur in MS patients. This quantitative MRI technique can provide more complete information about the extent and nature of the brain tissue destruction in MULTIPLE SCLEROSIS, which cannot be detected by conventional MRI.Material and Methods: In this study, twelve patients with relapsing-remitting MS and twelve healthy control subjects underwent conventional MR imaging including: T2-FSE, T1-SE and FLAIR sequences as wen as quantitative magnetization transfer imaging. An the focal LESIONs were identified on T2-weighted images and were classified according to their signal hypointensity on T1-weighted scans. The white matter and MS LESIONs were segmented using a semi-automated system. MT ratio (MTR) histogram analysis was performed for the BRAIN WHITE MATTER and the average MTR value was calculated for the classified MS LESIONs.Results: A significant reduction was found in MTR value of the normal appearing white matter (NAWM) in patients with relapsing-remitting MS, suggesting that MS is a more diffuse disease, affecting the whole brain tissue. A wide range changes in MTR values can be observed in MS LESIONs. MTR reduction is correlated with the degree of LESION hypointensity on T1-weighted scans. The lower MTR values of LESIONs that appear progressively more hypointense on T1-weigted images reflect varying degrees of demyelination and breakdown in the macromolecular structure of MS LESIONs. There was also a significant difference in MTR histogram parameters between the patients and control groups, accompanied by a total shift of NAWM-MTR histogram to the left.Discussion and Conclusion: Based on the obtained result it can be stated that MS has a diffused nature and the white matter abnormalities occurring outside T2-visible LESIONs affect the whole brain tissue. Quantitative magnetization transfer imaging can be used as a reliable method to assess both the overall disease burden and the intrinsic nature of the individual LESIONs in MS patients.

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APA: Copy

FOOLADI, MASOOMEH, RIAHI ALAM, NADER, HARIRCHYAN, MOHAMMAD HOSSEIN, FIRUZNIA, KAVOOS, OGHABIAN, MOHAMMAD ALI, SHAKIBA, MAJID, RAFIEE, BEHROOZ, & BAKHTIARY, MORTEZA. (2008). THE ASSESSMENT OF STRUCTURAL CHANGES IN MS PLAQUES AND NORMAL APPEARING WHITE MATTER USING QUANTITATIVE MAGNETIZATION TRANSFER IMAGING (MTI). IRANIAN JOURNAL OF MEDICAL PHYSICS, 4(2 (16-17)), 53-64. SID. https://sid.ir/paper/97000/en

Vancouver: Copy

FOOLADI MASOOMEH, RIAHI ALAM NADER, HARIRCHYAN MOHAMMAD HOSSEIN, FIRUZNIA KAVOOS, OGHABIAN MOHAMMAD ALI, SHAKIBA MAJID, RAFIEE BEHROOZ, BAKHTIARY MORTEZA. THE ASSESSMENT OF STRUCTURAL CHANGES IN MS PLAQUES AND NORMAL APPEARING WHITE MATTER USING QUANTITATIVE MAGNETIZATION TRANSFER IMAGING (MTI). IRANIAN JOURNAL OF MEDICAL PHYSICS[Internet]. 2008;4(2 (16-17)):53-64. Available from: https://sid.ir/paper/97000/en

IEEE: Copy

MASOOMEH FOOLADI, NADER RIAHI ALAM, MOHAMMAD HOSSEIN HARIRCHYAN, KAVOOS FIRUZNIA, MOHAMMAD ALI OGHABIAN, MAJID SHAKIBA, BEHROOZ RAFIEE, and MORTEZA BAKHTIARY, “THE ASSESSMENT OF STRUCTURAL CHANGES IN MS PLAQUES AND NORMAL APPEARING WHITE MATTER USING QUANTITATIVE MAGNETIZATION TRANSFER IMAGING (MTI),” IRANIAN JOURNAL OF MEDICAL PHYSICS, vol. 4, no. 2 (16-17), pp. 53–64, 2008, [Online]. Available: https://sid.ir/paper/97000/en

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