Top

Japanese Journal of Radiology

Published in:

01-07-2014 | Original Article

Minimizing the acquisition phase in coronary CT angiography using the second generation 320-row CT

Authors: Nobuo Tomizawa, Shigeaki Kanno, Eriko Maeda, Masaaki Akahane, Rumiko Torigoe, Kuni Ohtomo

Published in: Japanese Journal of Radiology | Issue 7/2014

Abstract

Purpose

We aimed to compare the radiation dose and image quality of a minimal phase window centered at 77 % compared with a wide phase window in coronary CT angiography using the second-generation 320-row CT.

Materials and methods

Eighty patients with heart rate ≤75 bpm were retrospectively included. The first 40 patients underwent scanning with a wide phase window (65–85 %), while the last 40 patients underwent scanning with a minimal phase window centered at 77 %. Subjective image quality was graded using a 4-point scale (4 = excellent). Image noise and contrast-to-noise ratio at the proximal segments were also analyzed. The mean effective dose was derived from the dose length product multiplied by a chest conversion coefficient (κ = 0.014 mSv mGy⁻¹ cm⁻¹).

Results

Minimal phase window scanning centered at 77 % reduced the radiation dose by 30 % compared with wide phase window scanning (1.7 vs 2.4 mSv, p = 0.0009). The subjective image quality showed no significant difference (3.75 vs 3.76, p = 0.77). No significant difference was observed in the image noise, CT number, and contrast-to-noise ratio.

Conclusions

Radiation dose could be reduced while maintaining image quality by use of a minimal phase window centered at 77 % compared with a wide phase window in coronary CT angiography using the second generation 320-row CT.

Available only for authorised users

Hsiao EM, Rybicki FJ, Steigner M. CT coronary angiography: 256-slice and 320-detector row scanners. Curr Cardiol Rep. 2010;12:68–75.PubMedCentralPubMedCrossRef

Steigner ML, Otero HJ, Cai T, Mitsouras D, Nallamshetty L, Whitmore AG, et al. Narrowing the phase window width in prospectively ECG-gated single heartbeat 320-detector row coronary CT angiography. Int J Cardiovasc Imaging. 2009;25:85–90.PubMedCrossRef

Tomizawa N, Nojo T, Akahane M, Torigoe R, Kiryu S, Ohtomo K. Adaptive iterative dose reduction in coronary CT angiography using 320-row CT: assessment of radiation dose reduction and image quality. J Cardiovasc Comput Tomogr. 2012;6:318–24.PubMedCrossRef

Tomizawa N, Nojo T, Akahane M, Torigoe R, Kiryu S, Ohtomo K. Shorter delay time reduces interpatient variability in coronary enhancement in coronary CT angiography using the bolus tracking method with 320-row CT. Int J Cardiovasc Imaging. 2013;29:185–90.PubMedCrossRef

Chen MY, Steigner ML, Leung SW, Kumamaru KK, Schultz K, Mather RT, et al. Simulated 50% radiation dose reduction in coronary CT angiography using adaptive iterative dose reduction in three dimensions (AIDR3D). Int J Cardiovasc Imaging. 2013;29:1167–75.PubMedCentralPubMedCrossRef

Bedayat A, Rybicki FJ, Kumamaru KK, Powers SL, Signorelli J, Steigner ML, et al. Reduced exposure using asymmetric cone beam processing for wide area detector cardiac CT. Int J Cardiovasc Imaging. 2012;28:381–8.PubMedCentralPubMedCrossRef

Raff GL, Abidov A, Achenbach S, Berman DS, Boxt LM, Budoff MJ, et al. SCCT guidelines for the interpretation and reporting of coronary computed tomographic angiography. J Cardiovasc Comput Tomogr. 2009;3:122–36.PubMedCrossRef

Tomizawa N, Komatsu S, Akahane M, Torigoe R, Kiryu S, Ohtomo K. Relationship between beat to beat coronary artery motion and image quality in prospectively ECG-gated two heartbeat 320-detector row coronary CT angiography. Int J Cardiovasc Imaging. 2012;28:139–46.PubMedCrossRef

Leipsic J, LaBounty TM, Ajlan AM, Earls JP, Strovski E, Madden M, et al. A prospective randomized trial comparing image quality, study interpretability, and radiation dose of narrow acquisition window with widened acquisition window protocols in prospectively ECG-triggered coronary computed tomography angiography. J Cardiovasc Comput Tomogr. 2012;7:18–24.CrossRef

10.

Halliburton SS, Abbara S, Chen MY, Gentry R, Mahesh M, Raff GL, et al. SCCT guidelines on radiation dose and dose-optimization strategies in cardiovascular CT. J Cardiovasc Comput Tomogr. 2011;5:198–224.PubMedCentralPubMedCrossRef

11.

Zhang C, Zhang Z, Yan Z, Xu L, Yu W, Wang R. 320-row CT coronary angiography: effect of 100-kV tube voltages on image quality, contrast volume, and radiation dose. Int J Cardiovasc Imaging. 2011;27:1059–68.PubMedCrossRef

12.

Motoyama S, Sarai M, Harigaya H, Anno H, Inoue K, Hara T, et al. Computed tomographic angiography characteristics of atherosclerotic plaques subsequently resulting in acute coronary syndrome. J Am Coll Cardiol. 2009;54:49–57.PubMedCrossRef

Title: Minimizing the acquisition phase in coronary CT angiography using the second generation 320-row CT
Authors: Nobuo Tomizawa
Shigeaki Kanno
Eriko Maeda
Masaaki Akahane
Rumiko Torigoe
Kuni Ohtomo
Publication date: 01-07-2014
Publisher: Springer Japan
Published in: Japanese Journal of Radiology / Issue 7/2014
Print ISSN: 1867-1071
Electronic ISSN: 1867-108X
DOI: https://doi.org/10.1007/s11604-014-0321-1

At a glance: The STEP trials

Springer Medicine

Minimizing the acquisition phase in coronary CT angiography using the second generation 320-row CT

Abstract

Purpose

Materials and methods

Results

Conclusions

At a glance: The STEP trials

Springer Medicine

Abstract

Purpose

Materials and methods

Results

Conclusions

Please log in to get access to this content

Other articles of this Issue 7/2014

Postmortem lung features in drowning cases on computed tomography

Acknowledgment

A case of gastric plexiform fibromyxoma: radiological and pathological findings

Computer-assisted system for diagnosing degenerative dementia using cerebral blood flow SPECT and 3D-SSP: a multicenter study

High-signal-intensity abnormalities evaluated by 3D fluid-attenuated inversion recovery imaging within the drainage territory of developmental venous anomalies identified by susceptibility-weighted imaging at 3 T

Optimization of scanning parameters for MR elastography at 3.0 T clinical unit: volunteer study