Susceptibility weighted imaging: differentiating between calcification and hemosiderin

Radiologia Brasileira

Jeam Haroldo Oliveira Barbosa¹  Antonio Carlos Santos¹  Carlos Ernesto Garrido Salmon¹ 

关键词: SWI;    Magnetic resonance imaging;    Magnetic susceptibility;    Calcification;    Hemosiderin;    SWI;    Ressonância magnética;    Suscetibilidade magnética;    Calcificação;    Hemossiderina;   

DOI  :  10.1590/0100-3984.2014.0010

来源: SciELO

【 摘 要 】

Objective:To present a detailed explanation on the processing of magnetic susceptibility weighted imaging (SWI), demonstrating the effects of echo time and sensitive mask on the differentiation between calcification and hemosiderin.Materials and Methods:Computed tomography and magnetic resonance (magnitude and phase) images of six patients (age range 41– 54 years; four men) were retrospectively selected. The SWI images processing was performed using the Matlab’s own routine.Results:Four out of the six patients showed calcifications at computed tomography images and their SWI images demonstrated hyperintense signal at the calcification regions. The other patients did not show any calcifications at computed tomography, and SWI revealed the presence of hemosiderin deposits with hypointense signal.Conclusion:The selection of echo time and of the mask may change all the information on SWI images, and compromise the diagnostic reliability. Amongst the possible masks, the authors highlight that the sigmoid mask allows for contrasting calcifications and hemosiderin on a single SWI image.

【 授权许可】

CC BY   
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