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  • 1
    Language: English
    In: European Journal of Radiology, June 2013, Vol.82(6), pp.e281-e285
    Description: A high-pitch dual-source CT (DSCT) was compared to a standard single-source CT protocol in terms of dose and image quality for malignant lymphoma staging. Data from 43 patients who underwent DSCT (group 1) of the neck for staging of malignant lymphoma and 40 patients who underwent regular single source CT (group 2) were investigated retrospectively. Volume CT dose index (CTDIvol), dose length product (DLP), background noise (BN), attenuation values, signal-to-noise-ratio (SNR), scan time, effective tube current-time product (eff. mAs), subjective diagnostic image quality and artifact burden were compared. CTDIvol (5.5 ± 0.8 mGy vs. 12.4 ± 1.4 mGy), DLP (172 ± 27 mGycm vs. 344 ± 60 mGycm, 〈 0.0001), eff. mAs (98 ± 15 mAs vs. 183 ± 20 mAs, 〈 0.0001) and scan time (0.64 ± 0.05 s vs. 8.21 ± 0.72 s) were lower for group 1. BN was higher ( 〈 0.001) for group 1 with a mean difference of 2.6 HU. SNR for sternocleidomastoid and pectoral muscle was lower (6.6–12.3 vs. 7.8–19.1) for group 1. Subjective image quality (1.55 ± 0.6 vs. 1.42 ± 0.5) and artifact burden (1.62 ± 1.0 vs. 1.57 ± 0.9) were not rated significantly different ( = 0.47 and = 0.80) with a good inter-observer agreement ( = 0.59–0.90). High-pitch DSCT allows reduction of patient dose for cervical lymphoma staging while diagnostic image quality is preserved.
    Keywords: High-Pitch ; Dual Source ; Computed Tomography ; Cervical Lymph Node ; Lymphoma ; Medicine
    ISSN: 0720-048X
    E-ISSN: 1872-7727
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  • 2
    Language: English
    In: European Journal of Radiology, June 2016, Vol.85(6), pp.1058-1062
    Description: To evaluate a novel tin filter-based abdominal CT protocol for urolithiasis in terms of image quality and CT dose parameters. 130 consecutive patients with suspected urolithiasis underwent CT with three different protocols: 48 patients (group 1) were examined at tin-filtered 150 kV (150 kV Sn) on a third-generation dual-source-CT, 33 patients were examined with automated kV-selection (110–140 kV) based on the scout view on the same CT-device (group 2), and 49 patients were examined on a second-generation dual-source-CT (group 3) with automated kV-selection (100–140 kV). Automated exposure control was active in all groups. Image quality was subjectively evaluated on a 5-point-likert-scale by two radiologists and interobserver agreement as well as signal-to-noise-ratio (SNR) was calculated. Dose-length-product (DLP) and volume CT dose index (CTDIvol) were compared. Image quality was rated in favour for the tin filter protocol with excellent interobserver agreement (ICC = 0.86–0.91) and the difference reached statistical significance (p 〈 0.001). SNR was significantly higher in group 1 and 2 compared to second-generation DSCT ( ). On third-generation dual-source CT, there was no significant difference in SNR between the 150 kV Sn and the automated kV selection protocol (p = 0.5). The DLP of group 1 was 23% and 21% (p 〈 0.002) lower in comparison to group 2 and 3, respectively. So was the CTDIvol of group 1 compared to group 2 (−36%) and 3 (−32%) (p 〈 0.001). Additional shaping of a 150 kV source spectrum by a tin filter substantially lowers patient exposure while improving image quality on un-enhanced abdominal computed tomography for urinary stone disease.
    Keywords: Low-Dose Abdominal CT ; Urinary Stone Disease ; Spectral Shaping ; Tin Filter ; Medicine
    ISSN: 0720-048X
    E-ISSN: 1872-7727
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  • 3
    Language: English
    In: European Journal of Radiology, June 2013, Vol.82(6), pp.1028-1033
    Description: To investigate the bolus geometry in high-pitch CT angiography (CTA) of the aorta without ECG synchronisation in comparison to single-source CT. Overall 160 consecutive patients underwent CTA either in conventional single-source mode with a pitch of 1.2 (group 1), or in dual-source mode with a pitch of 3.0 (groups 2, 3 and 4) using different contrast media timings with bolus triggering at 140 HU (5 s, group 1; 10 s, group 2; 12 s, group 3; 14 s, group 4). Contrast material, saline flush, flow rate and kV/mAs settings were kept equal for optimum comparability. Aortic attenuation was measured along the -axis of the patient at different anatomic landmarks and subjective image quality was compared. The most homogeneous enhancement of the aorta was reached with a delay of 10 s after reaching the trigger threshold. The imaging length was not significantly different, but the examination time was significantly ( 〈 0.001) shorter in the high-pitch group (7.7 s vs. 1.7 s for group 1 vs. 2, 3 and 4). In high-pitch CT angiography using a start delay of 10 s after a trigger threshold of 140 HU in the descending aorta is reached, a homogenous contrast along the -axis is accomplished.
    Keywords: CT Angiography ; Aorta ; High-Pitch CT ; Dual-Source CT ; Bolus Geometry ; Medicine
    ISSN: 0720-048X
    E-ISSN: 1872-7727
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