대한의용생체공학회:의공학회지 (Journal of Biomedical Engineering Research)

  • 제33권2호
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  • Pages.72-77
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  • 2012
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  • 1229-0807(pISSN)
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  • 2288-9396(eISSN)
대한의용생체공학회 (The Korean Society of Medical and Biological Engineering)
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Keyhole Imaging기법을 적용한 위상대조도 자기공명 혈관조영기법

Keyhole Imaging Combined Phase Contrast MR Angiography Technique

  • 이동훈 (연세대학교 보건과학대학 방사선학과) ;
  • 홍철표 (연세대학교 보건과학대학 방사선학과) ;
  • 한봉수 (연세대학교 보건과학대학 방사선학과) ;
  • 이만우 (삼성전자)
  • Lee, D.H. (Dept. of Radiological Science, College of Health Science, Yonsei University) ;
  • Hong, C.P. (Dept. of Radiological Science, College of Health Science, Yonsei University) ;
  • Han, B.S. (Dept. of Radiological Science, College of Health Science, Yonsei University) ;
  • Lee, M.W. (Dept. of Research and Development, Health & Medical Equipment, Samsung Electronics Co., LTD.)
  • 투고 : 2012.03.15
  • 심사 : 2012.04.27
  • 발행 : 2012.06.30
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초록

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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피인용 문헌

  1. Keyhole-3D phase contrast magnetic resonance angiography: A time-resolved reconstruction method vol.24, pp.1, 2014, https://doi.org/10.1002/ima.22072