Influence of cardiac motion on diffusion-weighted magnetic resonance imaging of the liverReportar como inadecuado




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Magnetic Resonance Materials in Physics, Biology and Medicine

, Volume 22, Issue 5, pp 319–325

First Online: 02 September 2009Received: 01 June 2009Revised: 03 August 2009Accepted: 12 August 2009

Abstract

PurposeTo assess cardiac motion-induced signal loss in diffusion-weighted magnetic resonance imaging DWI of the liver using dynamic DWI.

Materials and methodsThree volunteers underwent dynamic coronal DWI of the liver under breathholding, in the diastolic DWIdiast or systolic DWIsyst cardiac phase, and with motion probing gradients MPGs in phase encoding P, left–right, frequency encoding M, superior–inferior, or slice select S, anterior–posterior direction. Liver-to-background contrasts LBCs of DWIsyst were compared to those of DWIdiast, for both the left and right liver lobes, using nonparametric tests. Signal decrease ratios SDRs were calculated as 1−LBCDWIsyst-LBCDWIdiast × 100%. DWIsyst was further analyzed to determine which direction of MPGs was most affected by cardiac motion.

ResultsIn the left liver lobe, LBCs of DWIsyst median 3.35 were significantly lower P < 0.0001 than those of DWIdiast median 4.84. In the right liver lobe, LBCs of DWIsyst median 4.17 were also significantly lower P < 0.0001 than those of DWIdiast median 5.35 . SDRs of the left and right liver lobes were 25.5% and 17.3%, respectively. In DWIsyst, the significantly lowest P < 0.05 LBCs were observed in the M direction left liver lobe and P direction right liver lobe of MPGs.

ConclusionSignal intensity of both liver lobes are affected by cardiac motion in DWI. In the left liver lobe, signal loss especially occurs in the superior–inferior direction of MPGs, whereas in the right lobe, signal loss especially occurs in the left-right direction of MPGs.

KeywordsDiffusion-weighted magnetic resonance imaging DWI Dynamic Liver Cardiac motion Pseudo-anisotropy artifact  Download to read the full article text



Autor: Thomas C. Kwee - Taro Takahara - Tetsu Niwa - Marko K. Ivancevic - Gwenael Herigault - Marc Van Cauteren - Peter R. Luij

Fuente: https://link.springer.com/







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