Spiral Flow Fube for Contrast Medium Reduction in Coronary CT Angiography

Nobuo Tomizawa, Yayoi Hayakawa, Shinichi Inoh, Takeshi Nojo, Satoshi Uemura, Sunao Nakamura



To assess the diagnostic performance and enhancement of coronary CT with reduced contrast medium using the spiral flow tube compared with the T-shaped tube.


We retrospectively included 444 patients who underwent catheter examination within 2 months after coronary CT. The first 222 patients received 21.0 mgI/kg/s of contrast medium using the T-shaped tube and the injected contrast medium was reduced by 6% (19.8 mgI/kg/s) in the last 222 patients using the spiral flow tube. We compared the per vessel diagnostic performance for detecting obstructive stenosis (≥50%) by catheter examination and the enhancement of proximal coronary arteries.


The sensitivity, specificity, positive predictive value, negative predictive value and accuracy was 96%, 84%, 72%, 98% and 87% using the spiral flow tube and 93%, 83%, 68%, 97% and 86% using the T-shaped tube, respectively, without significance. The enhancement of left main (spiral flow vs T-shape, 407 ± 53 vs 407 ± 62 HU, p = 0.95) and right coronary (419 ± 58 vs 415 ± 61 HU, p = 0.49) arteries did not show significant difference.


The spiral flow tube would maintain the diagnostic performance and coronary enhancement with reduced contrast medium compared with the T-shaped tube.


Coronary CT angiography; coronary enhancement; image quality; saline flush; spiral flow tube

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DOI: https://doi.org/10.17987/icfj.v9i0.375

Copyright (c) 2017 Nobuo Tomizawa, Yayoi Hayakawa, Shinichi Inoh, Takeshi Nojo, Satoshi Uemura, Sunao Nakamura

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