Abstract
Purpose
This study was conducted in order to evaluate the image quality of 70 kVp and 25 mL contrast medium (CM) volume for head and neck computed tomographic angiography (CTA) and assess the diagnostic accuracy for arterial stenosis.
Methods
Fifty patients were prospectively divided into two groups randomly: group A (n = 25), 70 kVp with 25 mL CM, and group B (n = 25), 100 kVp with 40 mL CM. CT attenuation values, noise, signal-to-noise ratio (SNR), and contrast-to-noise ratio (CNR) of the shoulder, neck, and cerebral arteries were measured for objective image quality. Subjective image quality of the shoulder and cerebral arteries was also evaluated. For patients undergoing digital subtracted angiography (DSA), diagnostic accuracy of CTA was assessed with DSA as reference standard.
Results
The SNRs of the shoulder, neck, and cerebral arteries in group A were higher than those in group B (P < 0.05). The CNRs of the shoulder and neck arteries in group A were higher than those in group B (P < 0.05). There was no significant difference in subjective image quality of arteries between group A and group B (P > 0.05). The accuracy was noted as 94.0% (156/166) in group A and 97.1% (134/138) in group B for ≥ 50% stenosis. The accuracy of intracranial arterial stenosis was lower than that of extracranial arterial stenosis in group A. The radiation dose of group A was significantly decreased by 56% than that of group B.
Conclusion
Head and neck CTA at 70 kVp using 25 mL CM can obtain diagnostic image quality with lower radiation dose while maintaining high accuracy in detecting the arterial stenosis compared with the 100-kVp and 40-mL CM.
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Abbreviations
- CM:
-
Contrast medium
- CTA:
-
Computed tomographic angiography
- ADMIRE:
-
Advanced modeled iterative reconstruction
- FBP:
-
Filtered back projection
- SNR:
-
Signal-to-noise ratio
- CNR:
-
Contrast-to-noise ratio
- AA:
-
Aortic arch
- BTA:
-
Brachiocephalic trunk artery
- SA:
-
Subclavian artery
- CCA:
-
Common carotid artery
- VA:
-
Vertebral artery
- MCA:
-
Middle cerebral artery
- BA:
-
Basilar artery
- ED:
-
Effective dose
- DSA:
-
Digital subtracted angiography
- ROI:
-
Region of interest
- MPR:
-
Multiplanar reformation
- MIP:
-
Maximum intensity projections
- SD:
-
Standard deviation
- SCM:
-
Sternocleidomastoideus
- BS:
-
Brain stem
- ACA:
-
Anterior cerebral arteries
- PCA:
-
Posterior cerebral arteries
- SVC:
-
Superior vena cava
- SV:
-
Subclavian vein
- CTDIvol :
-
Volume CT dose index
- DLP:
-
Dose-length product
- ECA:
-
External carotid arteries
- PPV:
-
Positive predictive value
- NPV:
-
Negative predictive value
- CCAbi:
-
Bifurcation of CCA
- IR:
-
Iterative reconstruction
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All procedures performed in the studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
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Chen, Y., Zhang, X., Xue, H. et al. Head and neck angiography at 70 kVp with a third-generation dual-source CT system in patients: comparison with 100 kVp. Neuroradiology 59, 1071–1081 (2017). https://doi.org/10.1007/s00234-017-1901-4
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DOI: https://doi.org/10.1007/s00234-017-1901-4