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Korean Journal of Medical Physics 2008; 19(4): 269-275

Published online December 25, 2008

Copyright © Korean Society of Medical Physics.

Evaluation of Magnetization Transfer Ratio Imaging by Phase Sensitive Method in Knee Joint

슬관절 부위에서 자화전이 위상감도법에 의한 자화전이율 영상 평가

Moon-Hyun Yoon, Mi-Sook Seung*, Bo-Young Choe

윤문현ㆍ성미숙*ㆍ최보영

Department of Biomedical Engineering, College of Medicine, The Catholic University of Korea, *Department of Radiology, The Catholic University fo Korea, Holy Family Hospital, Kyeung-Gi Province, Buchon, Korea

가톨릭대학교 의과대학 의공학교실, *가톨릭대학교 성가병원 진단방사선과

Abstract

Although MR imaging is generally applicable to depict knee joint deterioration it, is sometimes occurred to mis-read and mis-diagnose the common knee joint diseases. In this study, we employed magnetization transfer ratio (MTR) method to improve the diagnosis of the various knee joint diseases. Spin-echo (SE) T2-weighted images (TR/TE 3,400-3,500/90–100 ms) were obtained in seven cases of knee joint deterioration, FSE T2-weighted images (TR/TE 4,500-5,000/100–108 ms) were obtained in seven cases of knee joint deterioration, gradient-echo (GRE) T2-weighted images (TR/TE 9/4.56/50° flip angle, NEX 1) were obtained in 3 cases of knee joint deterioration, In six cases of knee joint deterioration, fat suppression was performed using a T2-weighted short T1/tau inverse recovery (STIR) sequence (TR/TE =2,894-3,215 ms/70 ms, NEX 3, ETL 9). Calculation of MTR for individual pixels was performed on registration of unsaturated and saturated images. After processing to make MTR images, the images were displayed in gray color. For improving diagnosis, three-dimensional isotropic volume images, the MR tristimulus color mapping and the MTR map was employed. MTR images showed diagnostic images quality to assess the patients' pathologies. The intensity difference between MTR images and conventional MRI was seen on the color bar. The profile graph on MTR imaging effect showed a quantitative measure of the relative decrease in signal intensity due to the MT pulse. To diagnose the pathologies of the knee joint, the profile graph data was shown on the image as a small cross. The present study indicated that MTR images in the knee joint were feasible. Investigation of physical change on MTR imaging enables to provide us more insight in the physical and technical basis of MTR imaging. MTR images could be useful for rapid assessment of diseases that we examine unambiguous contrast in MT images of knee disorder patients.

KeywordsMagnetization transfer ratio (MTR) imaging, Phase sensitive method, 3D isotropic volume images, MR tristimulus color, The map of MTR

Korean Society of Medical Physics

Vol.35 No.4
December 2024

pISSN 2508-4445
eISSN 2508-4453
Formerly ISSN 1226-5829

Frequency: Quarterly

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