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KMID : 1131320160180020115
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Journal of Korean Society of Computed Tomographic Technology
2016 Volume.18 No. 2 p.115 ~ p.120
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The study about contrast media inject amount and Duration time to acquire certain imaging on NECK CTA
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So Ji-Un
Lee Hyun-Sung
Mun Ju-Wan
Bum Hee-Nam
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Abstract
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Purpose : we would like to know injection amount of contrast media and Duration time on NECK CTA through HU value reached the carotid artery and jugular vein.
Materials and Methods : we investigated 30 people those who underwent NECK CTA From Dec. 2015 to Feb. 2016. We had performed Test bolus technique at ascending aorta. we know that average peak time of ROI in ascending aorta is 20.56 second. Based on this data, we set that Duration time is 20second. and we injected combination of contrast media (contained iodine 350) and saline (CM:70cc, 3, 5/sec :Saline:50cc, 3, 5/sec). When HU value of ROI reach to 100, scan was triggered in cranio-caudal direction after 10 seconds (Delay time) using Bolus tracking technique. it was compared with the HU value of common carotid artery at the level of C3-C4 (common carotid artery bifurcation) and internal jugular vein on same line.
Result : The result of Mean HU value of common carotid artery is 435.03 HU and Mean HU value of internal juglar vein is 297.8 HU. The average percentage of the carotid artery and internal jugular vein is 100: 68.79. Standard deviation is ±11.91. Ratio in the range 50 to 80% of the internal jugular vein was accounted for more than 83%.
Conclusion : When injected with the appropriate volume of contrast and Duration time (20sec) and Delay time (10sec) check, it is possible to obtain a uniform image in the common carotid artery (100%) and the internal jugular vein (50-80%)on NECK CTA. In addition, the imaging reduced artifacts in the subclavian vein.
It is expected to be able to reduce the burden and side effects in patients By using a small amount of contrast Media.
NECK CTA examination must be placed correlation on the physical characteristic factors. It is to be conducted further research on the contrast media injection protocol and san method.
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KEYWORD
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Test bolus, Auto bolus tracking, Duration time, Delay time
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