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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 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
    Library Location Call Number Volume/Issue/Year Availability
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