Details

Autor(en) / Beteiligte

• Li, Jing-Lei
• Huang, Mei-Ping
• Cao, Xi-Ming
• Cui, Yan-Hai
• Ivanc, Thomas B
• Liang, Chang-Hong

Titel

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

Ist Teil von

• Coronary artery disease, 2015-06, Vol.26 (4), p.308-316

Ort / Verlag

England

Erscheinungsjahr

2015

Quelle

MEDLINE

Beschreibungen/Notizen

• To assess the impact of chest circumference (CC)-adjusted tube current and iterative reconstructions (iDose) on individualized radiation dose reduction and image quality (IQ) in ECG-triggered computed tomography coronary angiography (CTCA). A total of 102 patients underwent retrospectively ECG-triggered CTCA utilizing CC-adapted tube current [mAs=1000×(0.051×CC-23.765)/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. Subjective IQ was assessed, and image noise, signal-to-noise, and contrast-to-noise ratios (SNR and CNR) were quantified. Patients in group A had the highest radiation dose, followed by group B and group C. iDose 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 and group A with FBP, as was the case with subjective IQ. The combination of a CC-adapted technique, prospective triggering, and partial iterative reconstruction techniques reduces the radiation dose significantly, without significant degradation of IQ.