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KMID : 0357520160390020149
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Journal of Radiological Science and Technology
2016 Volume.39 No. 2 p.149 ~ p.156
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The Assessment of the Breath Hold and the Free Breath Methods about the Blood Flow Evaluation by Using Phase Contrast MRI
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Kim Seong-Ho
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Abstract
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Measurement of cardiac blood flow using the magnetic resonance imaging has been limited due to breathing and involuntary movements of the heart. The present study attempted to improve the accuracy of cardiac blood flow testing through phase contrast magnetic resonance imaging by presenting the adequate breathing method and imaging variables by comparing the measurement values of cardiac blood flow. Each was evaluated by comparing the breath hold retrospective 1NEX and non breath hold retrospective 1-3NEX in the ascending aorta and descending aorta. As a result, the average blood flow amount/ velocity of the breath hold retrosepctive 1NEX method in the ascending aorta were 96.17±19.12ml/sec, 17.04±4.12cm/sec respectively, which demonstrates a statistically significant difference(p<0.05)
with the non-breath hold retrospective method 1NEX of 72.31±13.27ml and 12.32±3.85. On the other hand, the average 2NEX blood flow and mean flow velocity is 101.90±24.09, 16.84±4.32, 3NEX 103.06±25.49, 16.88±4.19 did not show statistically significant differences(p>0.05).The average blood flow amount/ velocity of the breath hold retrospective 1NEX method in the descending aorta were 76.68±19.72ml/s, and 22.23±4.8, which did not demonstrate a significant difference in comparison to non-breath hold retrospective method 1-3 NEX. Therefore, the non breath hold retrospective method does
not significantly differ in terms of cardiac blood flow in comparison with the breath hold retrospective method in accordance with the increase of NEX, so pediatric patients or patients who are not able to breathe well must have the diagnostic value of their cardiac blood flow tests improved.
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KEYWORD
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Phase contrast MRI, Cardiac blood flow evaluation, Respiration synchronization
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