Image Quality of Iodine Maps for Pulmonary Embolism: A Comparison of Subtraction CT and Dual-Energy CT

2019 ◽  
Vol 212 (6) ◽  
pp. 1253-1259 ◽  
Author(s):  
Dagmar Grob ◽  
Ewoud Smit ◽  
Luuk J. Oostveen ◽  
Miranda M. Snoeren ◽  
Mathias Prokop ◽  
...  
Keyword(s):  
Pulmonary Embolism ◽  
Image Quality ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Iodine Maps

scholarly journals Metal artefact reduction of different alloys with dual energy computed tomography (DECT)

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Anand John Vellarackal ◽  
Achim Hermann Kaim
Keyword(s):  
Stainless Steel ◽  
Image Quality ◽  
Femoral Stem ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Bony Tissue ◽  
Stem Image ◽  
Metal Artefact ◽  
Artefact Reduction

AbstractTo evaluate the influence of dual-energy CT (DECT) and Virtual monochromatic spectral (VMS) imaging on: (1) the artefact size of geometrically identical orthopaedic implants consisting of three different compositions and (2) the image quality of the surrounding bone, three similar phantoms—each featuring one femoral stem composed of either titanium, chrome-cobalt or stainless steel surrounded by five calcium pellets (200 mg hydroxyapatite/calcium carbonate) to simulate bony tissue and one reference pellet located away from the femoral stem—were built. DECT with two sequential scans (80 kVp and 140 kVp; scan-to-scan technique) was performed, and VMS images were calculated between 40 and 190 keV. The artefact sizes were measured volumetrically by semiautomatic selection of regions of interest (ROIs), considering the VMS energies and the polychromatic spectres. Moreover, density and image noise within the pellets were measured. All three phantoms exhibit artefact size reduction as energy increases from 40 to 190 keV. Titanium exhibited a stronger reduction than chrome-cobalt and stainless steel. The artefacts were dependent on the diameter of the stem. Image quality increases with higher energies on VMS with a better depiction of surrounding structures. Monoenergetic energies 70 keV and 140 keV demonstrate superior image quality to those produced by spectral energies 80 kVp and 140 kVp.

scholarly journals Salvage of Suboptimal Enhancement of Pulmonary Artery in Pulmonary CT Angiography Studies: Rapid kVp Switch Dual Energy CT Experience

2020 ◽  
Vol 17 (2) ◽  
Author(s):  
Selen Bayraktaroglu ◽  
Akın Cinkooglu ◽  
Naim Ceylan ◽  
Recep Savas
Keyword(s):  
Pulmonary Embolism ◽  
Image Quality ◽  
Pulmonary Artery ◽  
Imaging Modality ◽  
Main Pulmonary Artery ◽  
Pulmonary Arteries ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Average Increase ◽  
Noise Ratio

Background: Multidetector computed tomography (MDCT) angiography is considered as the gold standard imaging modality in the evaluation of acute pulmonary embolism. Optimum vascular enhancement is critical for MDCT studies. The suboptimal opacification in pulmonary artery could be salvaged using low-energy virtual monoenergetic images (VMI) at rapid kVp switch dual energy CT. Objectives: To explore the potential improvement in pulmonary artery opacification and to assess the change in image quality parameters in VMI using fast switch kVp dual energy CT. Patients and Methods: The CT images of 877 patients who were referred with a preliminary diagnosis of pulmonary embolism were reviewed. Sixty patients with suboptimal enhancement (< 200 Hounsfeld Unit [HU]) were involved. Standard images (140 kVp) and VMI from 40 to 120 keV were generated. Attenuation, noise, signal to noise ratio (SNR) and contrast to noise ratio (CNR) were measured in the pulmonary artery. Using VMIs, the best image was determined as the image with the main pulmonary artery opacification greater than 200 HU and image quality ≥ 3. Fifty six studies that met these criteria were considered as salvaged. At this best energy level, quantitative parameters were compared with standard images. Results: The mean attenuation of pulmonary arteries was 169.80 HU in standard images in patients with suboptimal enhancement. The attenuations of VMIs at 40, 45, 50, 55, 60, 65, and 70 keV were significantly higher than standard images (P < 0.001). Similar findings were observed with SNR and CNR. In the salvaged patients, the average increase in mean pulmonary artery attenuation was 62% (from 172.61 ± 23.4 to 280.55 ± 40.7), the average increase in SNR was 38% (from 12.1 ± 5.3 to 16.7 ± 7.1) and the average increase in CNR was 48% (9.2 ± 4.3 to 13.7 ± 6) (P < 0.001). Conclusions: Low keV VMI reconstructions significantly increase pulmonary artery attenuation, CNR and SNR compared to standard image reconstructions. Suboptimal CT studies could be salvaged using low keV VMIs.

scholarly journals Comparison of Dual- and Single-Source Dual-Energy CT for Diagnosis of Acute Pulmonary Artery Embolism

2020 ◽  
Author(s):  
Bernhard Petritsch ◽  
Pauline Pannenbecker ◽  
Andreas Max Weng ◽  
Simon Veldhoen ◽  
Jan-Peter Grunz ◽  
...  
Keyword(s):  
Pulmonary Embolism ◽  
Image Quality ◽  
Radiation Dose ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Suspected Pulmonary Embolism ◽  
Effective Radiation Dose ◽  
Distribution Maps ◽  
Filter Group ◽  
Effective Radiation

Purpose Comparison of dual-source dual-energy CT (DS-DECT) and split-filter dual-energy CT (SF-DECT) regarding image quality and radiation dose in patients with suspected pulmonary embolism. Materials and Methods We retrospectively analyzed pulmonary dual-energy CT angiography (CTPA) scans performed on two different CT scanners in 135 patients with suspected pulmonary embolism (PE). Scan parameters for DS-DECT were 90/Sn150 kV (n = 68 patients), and Au/Sn120 kV for SF-DECT (n = 67 patients). The iodine delivery rate was 1400 mg/s in the DS-DECT group vs. 1750 mg/s in the SF-DECT group. Color-coded iodine distribution maps were generated for both protocols. Objective (CT attenuation of pulmonary trunk [HU], signal-to-noise ratio [SNR], contrast-to-noise ratio [CNR]) and subjective image quality parameters (two readers [R], five-point Likert scale), as well as radiation dose parameters (effective radiation dose, size-specific dose estimations [SSDE]) were compared. Results All CTPA scans in both groups were of diagnostic image quality. Subjective CTPA image quality was rated as good or excellent in 80.9 %/82.4 % (R1 / R2) of DS-DECT scans, and in 77.6 %/76.1 % of SF-DECT scans. For both readers, the image quality of split-filter iodine distribution maps was significantly lower (p < 0.05) with good or excellent ratings in only 43.3 %/46.3 % (R1 / R2) vs. 83.8 %/88.2 % for maps from DS-DECT. The HU values of the pulmonary trunk did not differ between the two techniques (p = n. s.), while both the SNR and CNR were significantly higher in the split-filter group (p < 0.001; p = 0.003). Both effective radiation dose (2.70 ± 1.32 mSv vs. 2.89 ± 0.94 mSv) and SSDE (4.71 ± 1.63 mGy vs. 5.84 ± 1.11 mGy) were significantly higher in the split-filter group (p < 0.05). Conclusion The split-filter allows for dual-energy imaging of suspected pulmonary embolism but is associated with lower iodine distribution map quality and higher radiation dose. Key points:  Citation Format

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 Application of Dual-Energy CT Non-Linear Fusion Technology in Improving CTA Image Quality of Renal Cancer

2018 ◽  
Vol 08 (03) ◽  
pp. 73-80
Author(s):  
Shuiqing Zhuo ◽  
Xiaoling Chen ◽  
Jingping Yu ◽  
Sihui Zeng ◽  
Lizhi Liu
Keyword(s):  
Image Quality ◽  
Renal Cancer ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Fusion Technology ◽  
Non Linear

scholarly journals Dual-energy CT and ceramic or titanium prostheses material reduce CT artifacts and provide superior image quality of total knee arthroplasty

2018 ◽  
Vol 27 (5) ◽  
pp. 1552-1561 ◽  
Author(s):  
Maximilian F. Kasparek ◽  
Michael Töpker ◽  
Mathias Lazar ◽  
Michael Weber ◽  
Michael Kasparek ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Image Quality ◽  
Knee Arthroplasty ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Total Knee ◽  
Superior Image Quality

Objective and Subjective Image Quality of Liver Parenchyma and Hepatic Metastases with Virtual Monoenergetic Dual-source Dual-energy CT Reconstructions

2014 ◽  
Vol 21 (4) ◽  
pp. 514-522 ◽  
Author(s):  
Sonja Sudarski ◽  
Paul Apfaltrer ◽  
John W. Nance ◽  
Mathias Meyer ◽  
Christian Fink ◽  
...  
Keyword(s):  
Image Quality ◽  
Hepatic Metastases ◽  
Liver Parenchyma ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Subjective Image Quality ◽  
Dual Source

Impact of Iodine Delivery Rate with Varying Flow Rates on Image Quality in Dual-Energy CT of Patients with Suspected Pulmonary Embolism

2013 ◽  
Vol 20 (8) ◽  
pp. 962-971 ◽  
Author(s):  
Jan Hansmann ◽  
Christian Fink ◽  
Gregor Jost ◽  
Hubertus Pietsch ◽  
Mathias Meyer ◽  
...  
Keyword(s):  
Pulmonary Embolism ◽  
Image Quality ◽  
Dual Energy ◽  
Delivery Rate ◽  
Dual Energy Ct ◽  
Suspected Pulmonary Embolism ◽  
Flow Rates

Single- and dual-energy CT of the abdomen: comparison of radiation dose and image quality of 2nd and 3rd generation dual-source CT

2016 ◽  
Vol 27 (2) ◽  
pp. 642-650 ◽  
Author(s):  
Julian L. Wichmann ◽  
Andrew D. Hardie ◽  
U. Joseph Schoepf ◽  
Lloyd M. Felmly ◽  
Jonathan D. Perry ◽  
...  
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Dual Source Ct ◽  
Dual Source
Sign in / Sign up

Export Citation Format

Share Document