PMID: 16639399Apr 28, 2006Paper

Effect of vibration caused by time-varying magnetic fields on diffusion-weighted MRI

Nihon Hoshasen Gijutsu Gakkai zasshi
Akio OguraTakaharu Hongoh

Abstract

Diffusion-weighted images (DWIs) with high b-factor in the body are often used to detect and diagnose cancer at MRI. The echo planar imaging (EPI) sequence and high motion probing gradient pulse are used at diffusion weighted imaging, causing high table vibration. The purpose of this study was to assess whether the diffusion signal and apparent diffusion coefficient (ADC) values are influenced by this vibration because of time-varying magnetic fields. Two DWIs were compared. In one, phantoms were fixed on the MRI unit's table transmitting the vibration. In the other, phantoms were supported in air, in the absence of vibration. The phantoms called "solution phantoms" were made from agarose of a particular density. The phantoms called "jelly phantoms" were made from agarose that was heated. The diffusion signal and ADC value of each image were compared. The results showed that the signal of DWI units using the solution phantom was not affected by vibration. However, the signal of DWI and ADC were increased in the low-density jelly phantom as a result of vibration, causing the jelly phantom to vibrate. The DWIs of vibrating regions such as the breast maybe be subject to error. A countermeasure seems to be to support the region ade...Continue Reading

References

Mar 9, 2002·Journal of Computer Assisted Tomography·Motoyuki KatayamaHiroyuki Kabasawa
Aug 31, 2002·Journal of Magnetic Resonance Imaging : JMRI·Yong GuoJia-Hong Gao
Mar 18, 2005·Journal of Computer Assisted Tomography·Ryota ShimofusaHisao Ito
Aug 12, 2005·Magnetic Resonance in Medical Sciences : MRMS : an Official Journal of Japan Society of Magnetic Resonance in Medicine·Yoshifumi KurokiShigeru Nawano
Aug 30, 2005·Magnetic Resonance in Medical Sciences : MRMS : an Official Journal of Japan Society of Magnetic Resonance in Medicine·Reiko WoodhamsKazushige Hayakawa

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