Self-calibrating Coil Sensitivity Profiles for Parallel Imaging Based on Anisotropic Diffusion

Liu, Xiaofang; Ye, XiuZi; Zhang, Sanyuan; Liu, Feng

doi:10.4304/jmm.5.6.580-587

JMM

2010

DOI: 10.4304/jmm.5.6.580-587

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Self-calibrating Coil Sensitivity Profiles for Parallel Imaging Based on Anisotropic Diffusion

Xiaofang Liu¹,

XiuZi Ye²,

Sanyuan Zhang³

et al.

Abstract: Calibration of the spatial sensitivity functions of coil arrays is a crucial element in parallel magnetic resonance imaging (PMRI).In order to overcome the sensitivity miscalibration errors introduced by pre-scan calibration method and decrease the total examination time Show more

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2012

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Cited by 1 publication

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Keyhole Imaging Combined Phase Contrast MR Angiography Technique

Lee¹,

Hong²,

Han³

et al. 2012

Journal of Biomedical Engineering Research

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Phase Contrast MR Angiography(PC MRA) is excellent MRA technique for measuring the velocity of vessels in the human body. PC MRA need to at least four images for angiogram reconstruction and it caused longer scan time. Therefore, we used keyhole imaging combined PC MRA to reduce the scan time. However, keyhole imaging can lead the erroneous effects as loss of phase information or frequency discontinuous. In this study, we applied the keyhole imaging combined 2D PC MRA for improving the temporal resolution and also measured the velocity to evaluate the accuracy of phase information. We used 0.32T MRI scanner(Magfinder II, Scimedix, Korea). Using the 2D PC MRA pulse sequence, the vascular images for a human brain targeted on the Superior Sagittal Sinus(SSS) were obtained. We applied tukey window function for keyhole images to minimize the ringing artifact and erroneous factors that are induced frequency discontinuous and phase information loss. We also applied zero-padded algorithm to peripheral missing k-space lines to compare keyhole imaging results and the artifact power(AP) value was measured on the complex difference images to validate the image quality. Consider as based on our results, heavy image distortions and artifacts were shown until using at least 50% keyhole factor. Using above the 50% keyhole factors are shown well reconstructed and matched for magnitude images and velocity information measurements. In conclusion, we confirmed the image quality and velocity information of keyhole technique combined 2D PC MRA. Especially, measured velocity information through the keyhole imaging combination was similar to the velocity information of full sampled k-space image despite of frequency discontinuous and phase information loss in the keyhole imaging reconstruction process. Consequently, the keyhole imaging combined 2D PC MRA will give some clinical usefulness and advantages as improving the temporal resolution and measuring the velocity information via selecting the appropriate keyhole factor at low tesla MRI system.

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Keyhole Imaging Combined Phase Contrast MR Angiography Technique

Lee¹,

Hong²,

Han³

et al. 2012

Journal of Biomedical Engineering Research

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show abstract

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Self-calibrating Coil Sensitivity Profiles for Parallel Imaging Based on Anisotropic Diffusion

Abstract: Calibration of the spatial sensitivity functions of coil arrays is a crucial element in parallel magnetic resonance imaging (PMRI).In order to overcome the sensitivity miscalibration errors introduced by pre-scan calibration method and decrease the total examination time Show more

Cited by 1 publication

References 15 publications

Keyhole Imaging Combined Phase Contrast MR Angiography Technique

Keyhole Imaging Combined Phase Contrast MR Angiography Technique

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