Study of the signal intensity of superior sagittal sinus in susceptibility weighted imaging / 实用放射学杂志

ABSTRACT

Objective To study the relevant factors capable of affecting the signal intensity of superior sagittal sinus(SSS)in susceptibility weighted imaging(SWI),and to discover the reason why venous blood in SSS shows high intensity.Methods 26 healthy volunteers and 20 patients with hemodynamic abnormalities of SSS were selected and underwent SWI sequence scanning of 3.0T MR system. Time of echo(TE),angle between SSS and scanning plane and velocity of blood flow were studied as three variables.By controlling two of all three variables at a time,the correlation with the signal intensity of normal SSS were acquired.Results 26 healthy volunteers were scanned with SWI sequence with TE of 20 ms,40 ms and 60 ms.Contrast values(CVs)were calculated based on the signal value of region of interest(ROI).The overall difference was statistically significant(P<0.05),and the differences between each two groups were also statistically significant(P<0.05).In addition,the CV and TE had a negative correlation(r= -0.686,P=0.000).The angle between SSS and scanning plane could affect the signal,and the signal peaked when they were perpendicular to each other.By comparing healthy volunteers with patients with slower blood flow,the difference between the two groups was statistically significant(t=9.684, P<0.05),and a positive correlation had been discovered between the velocity of blood flow and the signal intensity.Conclusion The high signal intensity of healthy persons'SSS in SWI is subject to the time of flight.Furthermore,TE,angle between SSS and scanning plane and velocity of blood flow are three factors which can affect the signal intensity.