Proceedings of the KOSOMBE Conference (대한의용생체공학회:학술대회논문집)

The Korean Society of Medical and Biological Engineering (대한의용생체공학회)
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MR ANGIOGRAPHY USING THE COMPOSITE [$90^{\circ}-{\tau}-180^{\circ}-2{\tau}-180^{\circ}-{\tau}$] SEQUENCE

복합 [$90^{\circ}-{\tau}-180^{\circ}-2{\tau}-180^{\circ}-{\tau}$ 시이퀸스를 이용한 핵자기 공명 혈관 조영술

  • Kim, J.H. (Dept. of E.E., Korea Advanced Institute of Science) ;
  • Lee, K.D. (Dept. of E.E., Korea Advanced Institute of Science) ;
  • Jeon, H.H. (Dept. of E.E., Korea Advanced Institute of Science) ;
  • Cho, Z.H. (Dept. of E.E., Korea Advanced Institute of Science)
  • 김재호 (한국과학기술원, 전기 및 전자공학과) ;
  • 이기동 (한국과학기술원, 전기 및 전자공학과) ;
  • 전현호 (한국과학기술원, 전기 및 전자공학과) ;
  • 조장희 (한국과학기술원, 전기 및 전자공학과)
  • Published : 1989.05.26
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Abstract

A new MR angiography technique using a composite sequence for the suppression of static sample signals is proposed and verified with experiments. When the composite [$90^{\circ}-{\tau}-180^{\circ}-2{\tau}-180^{\circ}-{\tau}$] sequence is applied, the large signal from the static sample is sufficiently suppressed but the signal from fresh inflow sample of which amplitude. is observed without suppression. These properties are appropriate for angiographic applications. In this paper, a modified line scan method (Block line scan angiography) incorporated with the composite [$90^{\circ}-{\tau}-180^{\circ}-2{\tau}-180^{\circ}-{\tau}$] sequence is used to obtain flow-only images, i.e., angiograms. The block line scan method improves the resolution in the flow-direction at the expense of imaging time. With the composite sequence, there is no need for subtraction procedure as in the most conventional angiographic methods. Experimental results for a phantom and a normal volunteer with KAIS 2.0 Tesla MRI system are shown.

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