Individualized reduction of radiation dose with a chest circumference-adapted technique and iterative reconstructions in 256-slice retrospective and prospective ECG-triggered computed tomography coronary angiography. Issue 4 (June 2015)

• Record Type: Journal Article
• Authors: Li, Jing-Lei; Huang, Mei-Ping; Cao, Xi-Ming; Cui, Yan-Hai; Ivanc, Thomas B.; Liang, Chang-Hong
• Is Part Of: Coronary artery disease. Volume 26:Issue 4(2015:Jun.)
• Publication Date: 2015-06
• Subjects: Coronary heart disease -- Periodicals; Coronary Disease -- Indexes; Coronary Disease -- Periodicals; 616.123005
• DOI: 10.1097/MCA.0000000000000232
• Languages: English
• ISSNs: 0954-6928

Abstract

<abstract> <title> <x xml:space="preserve">Abstract</x> </title> <sec> <title>Purpose</title> <p>To assess the impact of chest circumference (CC)-adjusted tube current and iterative reconstructions (iDose<sup>4</sup>) on individualized radiation dose reduction and image quality (IQ) in ECG-triggered computed tomography coronary angiography (CTCA).</p> </sec> <sec> <title>Materials and methods</title> <p>A total of 102 patients underwent retrospectively ECG-triggered CTCA utilizing CC-adapted tube current [mAs=1000×(0.051×CC−23.765)<sup>2</sup>/900] and filtered back projection (FBP) reconstruction (group A). On the basis of the CC-adjusted tube current technique, 54 patients (group B) underwent retrospective ECG-triggered CTCA with a 20% mAs reduction compared with group A and 90 patients (group C) underwent prospective ECG-triggered CTCA with an 80% mAs reduction compared with group A; both groups B and C were reconstructed with FBP and iDose<sup>4</sup>. Subjective IQ was assessed, and image noise, signal-to-noise, and contrast-to-noise ratios (SNR and CNR) were quantified.</p> </sec> <sec> <title>Results</title> <p>Patients in group A had the highest radiation dose, followed by group B and group C. iDose<sup>4</sup> provided decreased image noise and increased SNR and CNR, as did subjective IQ. The image noise was higher and SNR and CNR in group B were obviously lower than those in group A with FBP, but in group B, iDose4 increased the mean objective IQ. There was no difference between group B with iDose<sup>4</sup> and group A with FBP, as was the case with subjective IQ.</p> </sec> <sec> <title>Conclusion</title> <p>The combination of a CC-adapted technique, prospective triggering, and partial iterative reconstruction techniques reduces the radiation dose significantly, without significant degradation of IQ.</p> </sec> </abstract>