scholarly journals Technical Note: Insertion of digital lesions in the projection domain for dual-source, dual-energy CT

2017 ◽  
Vol 44 (5) ◽  
pp. 1655-1660 ◽  
Author(s):  
Andrea Ferrero ◽  
Baiyu Chen ◽  
Zhoubo Li ◽  
Lifeng Yu ◽  
Cynthia McCollough
Keyword(s):  
Dual Energy ◽  
Technical Note ◽  
Dual Energy Ct ◽  
Dual Source ◽  
Projection Domain

Supraaortale Dual-Source-Dual-Energy CT-Angiographie: Selektive Knochensubtraktion

2007 ◽  
Vol 179 (S 1) ◽  
Author(s):  
D Morhard ◽  
TR Johnson ◽  
K Nikolaou ◽  
MF Reiser ◽  
CR Becker
Keyword(s):  
Dual Energy ◽  
Dual Energy Ct ◽  
Dual Source ◽  
Ct Angiographie

scholarly journals Threshold-dependent iodine imaging and spectral separation in a whole-body photon-counting CT system

2021 ◽  
Author(s):  
S. Sawall ◽  
L. Klein ◽  
E. Wehrse ◽  
L. T. Rotkopf ◽  
C. Amato ◽  
...  
Keyword(s):  
Image Quality ◽  
Photon Counting ◽  
Dual Energy ◽  
Whole Body ◽  
Dual Energy Ct ◽  
Post Mortem ◽  
Tube Voltage ◽  
Spectral Separation ◽  
Dual Source ◽  
Noise Ratio

Abstract Objective To evaluate the dual-energy (DE) performance and spectral separation with respect to iodine imaging in a photon-counting CT (PCCT) and compare it to dual-source CT (DSCT) DE imaging. Methods A semi-anthropomorphic phantom extendable with fat rings equipped with iodine vials is measured in an experimental PCCT. The system comprises a PC detector with two energy bins (20 keV, T) and (T, eU) with threshold T and tube voltage U. Measurements using the PCCT are performed at all available tube voltages (80 to 140 kV) and threshold settings (50–90 keV). Further measurements are performed using a conventional energy-integrating DSCT. Spectral separation is quantified as the relative contrast media ratio R between the energy bins and low/high images. Image noise and dose-normalized contrast-to-noise ratio (CNRD) are evaluated in resulting iodine images. All results are validated in a post-mortem angiography study. Results R of the PC detector varies between 1.2 and 2.6 and increases with higher thresholds and higher tube voltage. Reference R of the EI DSCT is found as 2.20 on average overall phantoms. Maximum CNRD in iodine images is found for T = 60/65/70/70 keV for 80/100/120/140 kV. The highest CNRD of the PCCT is obtained using 140 kV and is decreasing with decreasing tube voltage. All results could be confirmed in the post-mortem angiography study. Conclusion Intrinsically acquired DE data are able to provide iodine images similar to conventional DSCT. However, PCCT thresholds should be chosen with respect to tube voltage to maximize image quality in retrospectively derived image sets. Key Points • Photon-counting CT allows for the computation of iodine images with similar quality compared to conventional dual-source dual-energy CT. • Thresholds should be chosen as a function of the tube voltage to maximize iodine contrast-to-noise ratio in derived image sets. • Image quality of retrospectively computed image sets can be maximized using optimized threshold settings.

Impact of Intravenously Injected Contrast Agent on Bone Mineral Density Measurement in Dual-Source Dual-Energy CT

2021 ◽  
Author(s):  
Vitali Koch ◽  
Moritz H. Albrecht ◽  
Leon D. Gruenewald ◽  
Ibrahim Yel ◽  
Katrin Eichler ◽  
...  
Keyword(s):  
Bone Mineral Density ◽  
Contrast Agent ◽  
Bone Mineral ◽  
Density Measurement ◽  
Dual Energy ◽  
Bone Mineral Density Measurement ◽  
Dual Energy Ct ◽  
Mineral Density ◽  
Dual Source

scholarly journals Pulmonary Embolism Detection with Dual-Energy CT: Experimental Study of Dual-Source CT in Rabbits

Radiology ◽  
2009 ◽  
Vol 252 (1) ◽  
pp. 61-70 ◽  
Author(s):  
Long-Jiang Zhang ◽  
Yan-E Zhao ◽  
Sheng-Yong Wu ◽  
Benjamin M. Yeh ◽  
Chang-Sheng Zhou ◽  
...  
Keyword(s):  
Experimental Study ◽  
Pulmonary Embolism ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Dual Source Ct ◽  
Dual Source
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