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MR factor analysis: Improved technology for the assessment of 2D dynamic structures of benign and malignant salivary gland tumors
Author(s) -
Eida Sato,
Ohki Masafumi,
Sumi Misa,
Yamada Toshiro,
Nakamura Takashi
Publication year - 2008
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.21349
Subject(s) - salivary gland , pathology , medicine , radiology
Purpose To establish an MR factor analysis technique for two‐dimensional (2D) MR dynamic structures of benign and malignant salivary gland tumors. Materials and Methods Dynamic contrast‐enhanced MRI using a surface coil was performed on 36 patients with benign (N = 24) or malignant (N = 12) salivary gland tumors. Signal intensity kinetics in each pixel of the tumors after contrast medium injections were semiautomatically categorized into four patterns (slow uptake, rapid uptake with high washout, rapid uptake with low washout, and flat). The 2D distributions of the kinetic patterns in the tumors were compared with the histological features of the corresponding parts of the excised tumors and with overall kinetics obtained by a conventional analysis. Results The MR factor analysis technique allowed the pixel‐to‐pixel evaluation of the contrast enhancement kinetics of the salivary gland tumors. The 2D distributions of the time‐intensity curve (TIC) patterns correlated well with the histological features of the salivary gland tumors and allowed more detailed dynamic structures of the tumors compared with the results obtained by the conventional dynamic study analysis. Conclusion The proposed MR factor analysis would be clinically feasible to diagnose salivary gland tumors and tumor‐like lesions. J. Magn. Reson. Imaging 2008;27:1256–1262. © 2008 Wiley‐Liss, Inc.