Korean Journal of Radiology

The Korean Society of Radiology (대한영상의학회)
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Comparison of Chest Pain Protocols for Electrocardiography-Gated Dual-Source Cardiothoracic CT in Children and Adults: The Effect of Tube Current Saturation on Radiation Dose Reduction

  • Goo, Hyun Woo (Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center)
  • Received : 2017.05.18
  • Accepted : 2017.07.04
  • Published : 2018.02.01
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Abstract

Objective: To compare radiation doses between conventional and chest pain protocols using dual-source retrospectively electrocardiography (ECG)-gated cardiothoracic computed tomography (CT) in children and adults and assess the effect of tube current saturation on radiation dose reduction. Materials and Methods: This study included 104 patients ($16.6{\pm}7.7years$, range 5-48 years) that were divided into two groups: those with and those without tube current saturation. The estimated radiation doses of retrospectively ECG-gated spiral cardiothoracic CT were compared between conventional, uniphasic, and biphasic chest pain protocols acquired with the same imaging parameters in the same patients by using paired t tests. Dose reduction percentages, patient ages, volume CT dose index values, and tube current time products per rotation were compared between the two groups by using unpaired t tests. A p value < 0.05 was considered significant. Results: The volume CT dose index values of the biphasic chest pain protocol ($10.8{\pm}3.9mGy$) were significantly lower than those of the conventional protocol ($12.2{\pm}4.7mGy$, p < 0.001) and those of the uniphasic chest pain protocol ($12.9{\pm}4.9mGy$, p < 0.001). The dose-saving effect of biphasic chest pain protocol was significantly less with a saturated tube current ($4.5{\pm}10.2%$) than with unsaturated tube current method ($14.8{\pm}11.5%$, p < 0.001). In 76 patients using 100 kVp, patient age showed no significant differences between the groups with and without tube current saturation in all protocols (p > 0.05); the groups with tube current saturation showed significantly higher volume CT dose index values (p < 0.01) and tube current time product per rotation (p < 0.001) than the groups without tube current saturation in all protocols. Conclusion: The radiation dose of dual-source retrospectively ECG-gated spiral cardiothoracic CT can be reduced by approximately 15% by using the biphasic chest pain protocol instead of the conventional protocol in children and adults if radiation dose parameters are further optimized to avoid tube current saturation.

Keywords

References

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