Dual-energy MDCT: Comparison of pulmonary artery enhancement on dedicated CT pulmonary angiography, routine and low contrast volume studies

2011 ◽  
Vol 79 (2) ◽  
pp. e11-e17 ◽  
Author(s):  
Myrna C.B. Godoy ◽  
Samantha L. Heller ◽  
David P. Naidich ◽  
Bernard Assadourian ◽  
Christianne Leidecker ◽  
...  
Keyword(s):  
Pulmonary Artery ◽  
Pulmonary Angiography ◽  
Dual Energy ◽  
Ct Pulmonary Angiography ◽  
Low Contrast ◽  
Contrast Volume

scholarly journals Optimal Monochromatic Energy Levels in Dual-Energy Spectral CT Pulmonary Angiography with Low Contrast Medium Dosage

2020 ◽  
Vol 17 (2) ◽  
Author(s):  
Dong Han ◽  
Weihua Shi ◽  
Xiaoxia Chen ◽  
Jieli Zhou ◽  
Yong Yu ◽  
...  
Keyword(s):  
Adverse Effects ◽  
Energy Levels ◽  
Pulmonary Arteries ◽  
Pulmonary Angiography ◽  
Dual Energy ◽  
Spectral Ct ◽  
Ct Pulmonary Angiography ◽  
Low Contrast ◽  
Ct Attenuation ◽  
Contrast Dosage

Background: The contrast medium (CM) in CT pulmonary angiography may induce adverse effects to patients, and higher CM is associated with higher rates of contrast-induced-nephropathy and mortality. Reduction of CM dosage through improvement of examination techniques may help reduce the occurrence of CM-induced adverse effects and healthcare costs. Objectives: To determine the optimal monochromatic energy levels in dual-energy spectral CT pulmonary angiography (CTPA) with low contrast dosage. Patients and Methods: Thirty patients with suspected pulmonary embolism (PE) underwent dual-energy spectral CTPA with low radiation and low contrast doses with scanning protocol of GSI-36 with 260 mA, and 25 mL contrast (350 mgI/mL) with 4.0ml/s injection speed. The monochromatic images from 60 - 80 keV (interval 5 keV) were reconstructed using a 50% adaptive statistical iterative reconstruction (50% ASiR) algorithm at 1.25 mm slice thickness. The CT attenuation and standard deviation (SD) values of the main, right, left, right lower and left lower pulmonary arteries and the back muscle at the same level were measured on 60 – 80 keV images, and signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) were calculated and analyzed. The subjective image quality was evaluated by two experienced radiologists using a 5-level scoring method independently. Measurements were analyzed using IBM SPSS Statistics for Windows, version 25.0. (Armonk, NY: IBM Corp.). Results: CT attenuation values of the pulmonary arteries decreased with the increase of energy level in five-energy groups, with values greater than 300 HU at 60 keV - 70 keV energies. The 65 keV image had the highest SNR, CNR and lowest SD, with significant differences compared with those of other image sets (P < 0.05). The subjective quality scores for the 65 keV image was judged to be the highest by the two radiologists, but it was not significantly different from 60 keV and 70 keV (all P > 0.05). Conclusion: The 65 keV monochromatic images provided the highest SNR, CNR and subjective scores with the lowest image noise in dual-energy spectral CTPA with low contrast dosage.

A Systematic Review of Double Low-dose CT Pulmonary Angiography in Pulmonary Embolism

2019 ◽  
Vol 15 (5) ◽  
pp. 453-460 ◽  
Author(s):  
Sultan Aldosari ◽  
Zhonghua Sun
Keyword(s):  
Systematic Review ◽  
Pulmonary Embolism ◽  
Image Quality ◽  
Radiation Dose ◽  
Contrast Medium ◽  
Low Dose ◽  
Pulmonary Angiography ◽  
Ct Pulmonary Angiography ◽  
Low Contrast ◽  
Low Contrast Medium

Background: The aim of this study is to perform a systematic review of the feasibility and clinical application of double low-dose CT pulmonary angiography (CTPA) in the diagnosis of patients with suspected pulmonary embolism. Discussion: A total of 13 studies were found to meet selection criteria reporting both low radiation dose (70 or 80 kVp versus 100 or 120 kVp) and low contrast medium dose CTPA protocols. Lowdose CTPA resulted in radiation dose reduction from 29.6% to 87.5% in 12 studies (range: 0.4 to 23.5 mSv), while in one study, radiation dose was increased in the dual-energy CT group when compared to the standard 120 kVp group. CTPA with use of low contrast medium volume (range: 20 to 75 ml) was compared to standard CTPA (range: 50 to 101 ml) in 12 studies with reduction between 25 and 67%, while in the remaining study, low iodine concentration was used with 23% dose reduction achieved. Quantitative assessment of image quality (in terms of signal-to-noise ratio and contrast-to-noise ratio) showed that low-dose CTPA was associated with higher, lower and no change in image quality in 3, 3 and 6 studies, respectively when compared to the standard CTPA protocol. The subjective assessment indicated similar image quality in 11 studies between low-dose and standard CTPA groups, and improved image quality in 1 study with low-dose CTPA. Conclusion: This review shows that double low-dose CTPA is feasible in the diagnosis of pulmonary embolism with significant reductions in both radiation and contrast medium doses, without compromising diagnostic image quality.

scholarly journals Dual Energy CT Pulmonary Angiography with 6g Iodine—A Propensity Score-Matched Study

PLoS ONE ◽  
2016 ◽  
Vol 11 (12) ◽  
pp. e0167214 ◽  
Author(s):  
Andreas Meier ◽  
Kai Higashigaito ◽  
Katharina Martini ◽  
Moritz Wurnig ◽  
Burkhardt Seifert ◽  
...  
Keyword(s):  
Propensity Score ◽  
Pulmonary Angiography ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Ct Pulmonary Angiography ◽  
Matched Study

scholarly journals Dual-Energy CT Pulmonary Angiography (DECTPA) Quantifies Vasculopathy in Severe COVID-19 Pneumonia

2020 ◽  
Vol 2 (5) ◽  
pp. e200428 ◽  
Author(s):  
Carole A Ridge ◽  
Sujal R Desai ◽  
Nidhish Jeyin ◽  
Ciara Mahon ◽  
Dione L Lother ◽  
...  
Keyword(s):  
Pulmonary Angiography ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Ct Pulmonary Angiography

Quantitative lobar pulmonary perfusion assessment on dual-energy CT pulmonary angiography: applications in pulmonary embolism

2020 ◽  
Vol 30 (5) ◽  
pp. 2535-2542 ◽  
Author(s):  
Ramandeep Singh ◽  
Ryan Zipan Nie ◽  
Fatemeh Homayounieh ◽  
Bernhard Schmidt ◽  
Thomas Flohr ◽  
...  
Keyword(s):  
Pulmonary Embolism ◽  
Pulmonary Angiography ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Pulmonary Perfusion ◽  
Ct Pulmonary Angiography ◽  
Perfusion Assessment

Advanced virtual monoenergetic images: improving the contrast of dual-energy CT pulmonary angiography

2015 ◽  
Vol 70 (11) ◽  
pp. 1244-1251 ◽  
Author(s):  
A. Meier ◽  
M. Wurnig ◽  
L. Desbiolles ◽  
S. Leschka ◽  
T. Frauenfelder ◽  
...  
Keyword(s):  
Pulmonary Angiography ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Ct Pulmonary Angiography ◽  
Virtual Monoenergetic Images ◽  
Monoenergetic Images

scholarly journals Pulmonary Arterial Dilatation: Imaging Evaluation Using Multidetector Computed Tomography

2021 ◽  
Author(s):  
Sreenivasa Narayana Raju ◽  
Niraj Nirmal Pandey ◽  
Arun Sharma ◽  
Amarinder Singh Malhi ◽  
Siddharthan Deepti ◽  
...  
Keyword(s):  
Pulmonary Artery ◽  
Bronchial Tree ◽  
Pulmonary Angiography ◽  
Ct Pulmonary Angiography ◽  
Imaging Evaluation ◽  
Cross Sectional ◽  
Clinical Background ◽  
Cross Sectional Imaging ◽  
Life Threatening ◽  
Pulmonary Arterial

AbstractPulmonary artery dilatation comprises a heterogeneous group of disorders. Early diagnosis is important as the presentation may be incidental, chronic, or acute and life threatening depending upon the etiology. Cross-sectional imaging plays an important role, with CT pulmonary angiography being regarded as the first line investigation in the evaluation of pulmonary artery pathologies. Moreover, effects of pulmonary artery lesions on proximal and distal circulation can also be ascertained with the detection of associated conditions. Special attention should also be given to the left main coronary artery and the trachea-bronchial tree as they may be extrinsically compressed by the dilated pulmonary artery. In context of an appropriate clinical background, CT pulmonary angiography also helps in treatment planning, prognostication, and follow-up of these patients. This review mainly deals with imaging evaluation of the pulmonary arterial dilatations on CT with emphasis on the gamut of etiologies in the adult as well as pediatric populations.

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