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KMID : 0880420000010030142
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Korean Journal of Radiology
2000 Volume.1 No. 3 p.142 ~ p.151
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The Optimization of Scan Timing for Contrast-Enhanced Magnetic Resonance Angiography
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Jong Min J Lee/Jong Min J Lee
Yong Min Chang/Hun Kyu Ryeom/Sang Kwon Lee/Yong Sun Kim/Duk Sik Kang/Phillip J Tirman
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Abstract
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Objective: To determine the optimal scan timing for contrast-enhanced magnetic resonance angiography and to evaluate a new timing method based on the arteriovenous circulation time.
Materials and methods: Eighty-nine contrast-enhanced magnetic resonance angiographic examinations were performed mainly in the extremities. A 1.5T scanner with a 3-D turbo-FLASH sequence was used, and during each study, two consecutive arterial phases and one venous phase were acquired. Scan delay time was calculated from the time-intensity curve by the traditional (n = 48) and/or the new (n = 41) method. This latter was based on arteriovenous circulation time rather than peak arterial enhancement time, as used in the traditional method. The numbers of first-phase images showing a properly enhanced arterial phase were compared between the two methods.
Results: Mean scan delay time was 5.4 sec longer with the new method than with the traditional. Properly enhanced first-phase images were found in 65% of cases (31/48) using the traditional timing method, and 95% (39/41) using the new method. When cases in which there was mismatch between the target vessel and the time-intensity curve acquisition site are excluded, erroneous acquisition occurred in seven cases with the traditional method, but in none with the new method.
Conclusion: The calculation of scan delay time on the basis of arteriovenous circulation time provides better timing for arterial phase acquisition than the traditional method.
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KEYWORD
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Magnetic resonance (MR), angiography, Magnetic resonance (MR), contrast enhancement, Aorta, MR,
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