Automatic Bone Removal Technique in Whole-Body Dual-Energy CT Angiography: Performance and Image Quality

2012 ◽  
Vol 199 (5) ◽  
pp. W646-W650 ◽  
Author(s):  
Boris Schulz ◽  
Katharina Kuehling ◽  
Wolfgang Kromen ◽  
Petra Siebenhandl ◽  
Matthias Josef Kerl ◽  
...  
Keyword(s):  
Image Quality ◽  
Ct Angiography ◽  
Dual Energy ◽  
Whole Body ◽  
Dual Energy Ct ◽  
Bone Removal ◽  
Removal Technique

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.

Image Quality of Virtual Noncontrast Images Derived from Dual-energy CT Angiography after Endovascular Aneurysm Repair

2010 ◽  
Vol 21 (3) ◽  
pp. 315-321 ◽  
Author(s):  
Wieland H. Sommer ◽  
Anno Graser ◽  
Christoph R. Becker ◽  
Dirk A. Clevert ◽  
Maximilian F. Reiser ◽  
...  
Keyword(s):  
Image Quality ◽  
Ct Angiography ◽  
Endovascular Aneurysm Repair ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Aneurysm Repair

scholarly journals Dual-energy CT angiography in suspected pulmonary embolism: influence of injection protocols on image quality and perfused blood volume

2020 ◽  
Vol 36 (10) ◽  
pp. 2051-2059
Author(s):  
Aleksander Kosmala ◽  
Philipp Gruschwitz ◽  
Simon Veldhoen ◽  
Andreas Max Weng ◽  
Bernhard Krauss ◽  
...  
Keyword(s):  
Pulmonary Embolism ◽  
Image Quality ◽  
Ct Angiography ◽  
Blood Volume ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Suspected Pulmonary Embolism

Automatic Bone Removal Dual-Energy CT Angiography for the Evaluation of Intracranial Aneurysms

2010 ◽  
Vol 34 (6) ◽  
pp. 816-824 ◽  
Author(s):  
Long-Jiang Zhang ◽  
Sheng-Yong Wu ◽  
Colin S. Poon ◽  
Yan-E Zhao ◽  
Xue Chai ◽  
...  
Keyword(s):  
Ct Angiography ◽  
Intracranial Aneurysms ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Bone Removal

scholarly journals Dual energy CT angiography in peripheral arterial stents: optimal scanning protocols with regard to image quality and radiation dose

2017 ◽  
Vol 7 (5) ◽  
pp. 520-531 ◽  
Author(s):  
Abdulrahman Almutairi ◽  
Zakariya Al Safran ◽  
Saif A. AlZaabi ◽  
Zhonghua Sun
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Ct Angiography ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Peripheral Arterial
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