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- Title
Single- and dual-energy CT of the abdomen: comparison of radiation dose and image quality of 2nd and 3rd generation dual-source CT.
- Authors
Wichmann, Julian; Hardie, Andrew; Schoepf, U.; Felmly, Lloyd; Perry, Jonathan; Varga-Szemes, Akos; Mangold, Stefanie; Caruso, Damiano; Canstein, Christian; Vogl, Thomas; Cecco, Carlo; Wichmann, Julian L; Hardie, Andrew D; Schoepf, U Joseph; Felmly, Lloyd M; Perry, Jonathan D; Vogl, Thomas J; De Cecco, Carlo N
- Abstract
<bold>Objectives: </bold>To compare single-energy (SECT) and dual-energy (DECT) abdominal CT examinations in matched patient cohorts regarding differences in radiation dose and image quality performed with second- and third-generation dual-source CT (DSCT).<bold>Methods: </bold>We retrospectively analysed 200 patients (100 male, 100 female; mean age 61.2 ± 13.5 years, mean body mass index 27.5 ± 3.8 kg/m2) equally divided into four groups matched by gender and body mass index, who had undergone portal venous phase abdominal CT with second-generation (group A, 120-kV-SECT; group B, 80/140-kV-DECT) and third-generation DSCT (group C, 100-kV-SECT; group D, 90/150-kV-DECT). The radiation dose was normalised for 40-cm scan length. Dose-independent figure-of-merit (FOM) contrast-to-noise ratios (CNRs) were calculated for various organs and vessels. Subjective overall image quality and reader confidence were assessed.<bold>Results: </bold>The effective normalised radiation dose was significantly lower (P < 0.001) in groups C (6.2 ± 2.0 mSv) and D (5.3 ± 1.9 mSv, P = 0.103) compared to groups A (8.8 ± 2.3 mSv) and B (9.7 ± 2.4 mSv, P = 0.102). Dose-independent FOM-CNR peaked for liver, kidney, and portal vein measurements (all P ≤ 0.0285) in group D. Subjective image quality and reader confidence were consistently rated as excellent in all groups (all ≥1.53 out of 5).<bold>Conclusions: </bold>With both DSCT generations, abdominal DECT can be routinely performed without radiation dose penalty compared to SECT, while third-generation DSCT shows improved dose efficiency.<bold>Key Points: </bold>• Dual-source CT (DSCT) allows for single- and dual-energy image acquisition. • Dual-energy acquisition does not increase the radiation dose in abdominal DSCT. • Third-generation DSCT shows improved dose efficiency compared to second-generation DSCT. • Dose-independent figure-of-merit image contrast was highest with third-generation dual-energy DSCT. • Third-generation DSCT shows improved dose efficiency for SECT and DECT.
- Subjects
ABDOMINAL examination; TOMOGRAPHY; IMAGE quality in medical radiography; BODY mass index; HEPATIC portal system; ABDOMEN; ABDOMINAL radiography; COMPARATIVE studies; COMPUTED tomography; RESEARCH methodology; MEDICAL cooperation; RADIATION doses; RESEARCH; RESEARCH evaluation; EVALUATION research; RETROSPECTIVE studies
- Publication
European Radiology, 2017, Vol 27, Issue 2, p642
- ISSN
0938-7994
- Publication type
journal article
- DOI
10.1007/s00330-016-4383-6