Accuracy of Quantification of Iodine and Hounsfield Unit Values on Virtual Monochromatic Imaging Using Dual-Energy Computed Tomography

2018 ◽  
Vol 42 (6) ◽  
pp. 965-971 ◽  
Author(s):  
Hayate Washio ◽  
Shingo Ohira ◽  
Tsukasa Karino ◽  
Yuya Nitta ◽  
Masaaki Hayashi ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Hounsfield Unit ◽  
Dual Energy ◽  
Dual Energy Computed Tomography ◽  
Virtual Monochromatic Imaging ◽  
Monochromatic Imaging

scholarly journals Microvasculopathy evaluated by dual-energy computed tomography in chronic thromboembolic pulmonary hypertension and pulmonary arterial hypertension

2020 ◽  
Vol 41 (Supplement_2) ◽  
Author(s):  
K Miwa ◽  
Y Taniguchi ◽  
K Sumimoto ◽  
Y Matsuoka ◽  
Y Izawa ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Pulmonary Hypertension ◽  
Pulmonary Arterial Hypertension ◽  
Arterial Hypertension ◽  
Chronic Thromboembolic Pulmonary Hypertension ◽  
Hounsfield Unit ◽  
Dual Energy ◽  
Dual Energy Computed Tomography ◽  
Thromboembolic Pulmonary Hypertension ◽  
Pulmonary Arterial

Abstract Background It has been previously reported that poor subpleural perfusion (PSP) in dual-energy computed tomography (DE-CT) might suggest the microvasculopathy in patients with chronic thromboembolic pulmonary hypertension (CTEPH). However, it remains unclear whether pathological findings of microvasculopathy in CTEPH and pulmonary arterial hypertension (PAH) are equivalent. The aim is to evaluate the microvasculopathy in CTEPH and PAH by using clinical parameters and DE-CT. Methods We retrospectively reviewed PSP (defined as subpleural spaces either not or minimally perfused in all segments) of consecutive treatment-naïve 89 CTEPH patients and 20 PAH patients who underwent DECT from Feb. 2015 to Dec. 2019. We also evaluated hemodynamic parameters and DE-CT parameters including quantitative evaluation of pulmonary blood volume (PBV) which was calculated as the average of entire lung iodine density. Results PSP was observed in 49.4% of patients in CTEPH group versus 5.0% in PAH group (p<0.01). There were no significant differences in hemodynamics and lung PBV between CTEPH group and PAH group (mean pulmonary arterial pressure; 36.4±10.4mmHg vs 38.3±8.5mmHg p=0.464, pulmonary vascular resistance; 700±388dyne*sec/cm5 vs 805±440 dyne*sec/cm5 p=0.288, lung PBV; 24.9±6.4 Hounsfield Unit vs 22.0±6.6 Hounsfield Unit p=0.06, respectively), however diffusing capacity for carbon monoxide (%DLCO/VA) was significantly lower (69.5±16.8% vs 45.7±23.7% p<0.01) in PAH group. Conclusion PSP in DE-CT, which was observed more frequently in patients with CTEPH, might suggest the different mechanism of microvasculopathy from PAH in patients with CTEPH. Microvasculopathy in CTEPH would be diffuse very distal thrombosis. DE-CT is effective modality to detect microvasculopathy of diffuse distal thrombosis in patients with CTEPH. DECT, Poor subpleural perfusion Funding Acknowledgement Type of funding source: None

scholarly journals Accuracy and Efficiency of Determining Urinary Calculi Composition Using Dual-energy Computed Tomography Compared With Hounsfield Unit Measurements for Practicing Physicians

Urology ◽  
2014 ◽  
Vol 84 (3) ◽  
pp. 561-564 ◽  
Author(s):  
Maria A. Jepperson ◽  
El-Sayed H. Ibrahim ◽  
Abby Taylor ◽  
Joseph G. Cernigliaro ◽  
William E. Haley ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Urinary Calculi ◽  
Hounsfield Unit ◽  
Dual Energy ◽  
Dual Energy Computed Tomography ◽  
Practicing Physicians

Single-Source Dual-Energy Computed Tomography Detects Disk Injury in Patients with Vertebral Fractures

2019 ◽  
Author(s):  
Torsten Diekhoff ◽  
Michael Fuchs ◽  
Nils Engelhard ◽  
Kay-Geert Hermann ◽  
Michael Putzier ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Vertebral Fractures ◽  
Dual Energy ◽  
Single Source ◽  
Dual Energy Computed Tomography

Dual energy computed tomography angiography of a pulmonary embolized port catheter fragment

2011 ◽  
Vol 12 (1) ◽  
pp. 62-63 ◽  
Author(s):  
Thomas Henzler ◽  
Steffen Diehl ◽  
Susanne Jochum ◽  
Tim Sueselbeck ◽  
Stefan O Schoenberg ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Computed Tomography Angiography ◽  
Dual Energy ◽  
Port Catheter ◽  
Dual Energy Computed Tomography

scholarly journals Dual-Energy Computed Tomography of the Liver: Uses in Clinical Practices and Applications

Diagnostics ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 161
Author(s):  
Masakatsu Tsurusaki ◽  
Keitaro Sofue ◽  
Masatoshi Hori ◽  
Kosuke Sasaki ◽  
Kazunari Ishii ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Liver Tumors ◽  
Energy Levels ◽  
Ct Scanning ◽  
Dual Energy ◽  
Liver Imaging ◽  
X Rays ◽  
Clinical Practices ◽  
Dual Energy Computed Tomography ◽  
Noise Ratio

Dual-energy computed tomography (DECT) is an imaging technique based on data acquisition at two different energy settings. Recent advances in CT have allowed data acquisitions and simultaneous analyses of X-rays at two energy levels, and have resulted in novel developments in the field of abdominal imaging. The use of low and high X-ray tube voltages in DECT provide fused images that improve the detection of liver tumors owing to the higher contrast-to-noise ratio (CNR) of the tumor compared with the liver. The use of contrast agents in CT scanning improves image quality by enhancing the CNR and signal-to-noise ratio while reducing beam-hardening artifacts. DECT can improve detection and characterization of hepatic abnormalities, including mass lesions. The technique can also be used for the diagnosis of steatosis and iron overload. This article reviews and illustrates the different applications of DECT in liver imaging.

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