scholarly journals Split-bolus CT urography with synchronous nephrographic and excretory phase in dogs: comparison of image quality with three-phase CT urography and optimal allocation ratio of contrast medium

2020 ◽  
Vol 21 (4) ◽  
Author(s):  
Hyejin Je ◽  
Sang-Kwon Lee ◽  
Jin-Woo Jung ◽  
Youjung Jang ◽  
Saran Chhoey ◽  
...  
Keyword(s):  
Image Quality ◽  
Contrast Medium ◽  
Optimal Allocation ◽  
Ct Urography ◽  
Three Phase ◽  
Allocation Ratio

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 A technical note on intra-arterial cone-beam computed tomography for the evaluation of flow-diverter stents: Image quality differences between diluted and non-diluted contrast medium

2019 ◽  
Vol 26 (2) ◽  
pp. 164-169
Author(s):  
Naci Kocer ◽  
Sedat G Kandemirli ◽  
Daniel Ruijters ◽  
Michalis Mantatzis ◽  
Osman Kizilkilic ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Image Quality ◽  
Contrast Medium ◽  
Cone Beam Computed Tomography ◽  
Vessel Wall ◽  
Flow Diverter ◽  
Cone Beam ◽  
Gray Scale ◽  
Stent Deployment ◽  
Contrast Technique

Background Design of flow-diverter stents for flexibility, tractability, and low profile limits their radiopacity on conventional digital subtraction angiography. Cone-beam computed tomography (CBCT) offers higher spatial resolution for the evaluation of flow-diverter stents. However, CBCT requires optimal dilution and timing of contrast medium for simultaneous visualization of the stent, arterial lumen, and vessel wall. There are only limited data on the effects of different contrast dilutions on CBCT image quality in neurointerventional applications. Materials and methods In our institution, intra-arterial CBCTs were acquired during stent deployment and at follow-ups with 10% diluted contrast. We had recently started acquiring intra-arterial CBCTs with non-diluted contrast. Retrospective analysis of our flow-diverter data identified eight cases with different aneurysm locations who had intra-arterial CBCT with 10% diluted contrast immediately after flow-diverter stent deployment and with non-diluted contrast technique during follow-ups. For each case, the image quality between diluted and non-diluted contrast techniques was compared qualitatively by assessing stent visualization and quantitatively by plotting gray-scale intensity values along the vessel lumen. Results In two sets of CBCT images per each case, there was no substantial difference between diluted and non-diluted CBTC techniques for the evaluation of stent architecture and lumen opacification. Gray-scale intensity values perpendicular to the lumen revealed similar intensity values along the neighboring parenchyma, vessel wall, and lumen for the two different contrast techniques. Conclusion Intra-arterial CBCT angiography can be performed without contrast dilution and still achieve adequate image quality in certain cerebral aneurysms treated with flow diverter. The non-diluted contrast technique avoids the time loss during preparation of diluted contrast and installation of diluted contrast to the injector in angiography suites with a single power injector.

Split-Bolus Portal Venous Phase Dual-Energy CT Urography: Protocol Design, Image Quality, and Dose Reduction

2015 ◽  
Vol 205 (5) ◽  
pp. W492-W501 ◽  
Author(s):  
Chiao-Yun Chen ◽  
Jui-Sheng Hsu ◽  
Twei-Shiun Jaw ◽  
Ming-Chen Paul Shih ◽  
Lo-Jeh Lee ◽  
...  
Keyword(s):  
Image Quality ◽  
Dose Reduction ◽  
Dual Energy ◽  
Protocol Design ◽  
Dual Energy Ct ◽  
Ct Urography ◽  
Portal Venous Phase ◽  
Venous Phase

Coronary CT angiography by modifying tube voltage and contrast medium concentration: Evaluation of image quality and radiation dose

2019 ◽  
Vol 36 (7) ◽  
pp. 1391-1396 ◽  
Author(s):  
Seyede Shokoofeh Mousavi Gazafroudi ◽  
Mohammad Bagher Tavakkoli ◽  
Maryam Moradi ◽  
Seyede Shabnam Mousavi Gazafroudi ◽  
Ghasem Yadegarfar ◽  
...  
Keyword(s):  
Image Quality ◽  
Radiation Dose ◽  
Contrast Medium ◽  
Ct Angiography ◽  
Coronary Ct Angiography ◽  
Tube Voltage ◽  
Medium Concentration ◽  
Coronary Ct ◽  
Contrast Medium Concentration

scholarly journals Nonlinear Image Blending for Dual-Energy MDCT of the Abdomen: Can Image Quality Be Preserved If the Contrast Medium Dose Is Reduced?

2014 ◽  
Vol 203 (4) ◽  
pp. 838-845 ◽  
Author(s):  
Achille Mileto ◽  
Juan Carlos Ramirez-Giraldo ◽  
Daniele Marin ◽  
Marcela Alfaro-Cordoba ◽  
Christian D. Eusemann ◽  
...  
Keyword(s):  
Image Quality ◽  
Contrast Medium ◽  
Dual Energy ◽  
Image Blending ◽  
Medium Dose

Venous-phase chest CT with reduced contrast medium dose: Utilization of spectral low keV monoenergetic images improves image quality

2020 ◽  
Vol 122 ◽  
pp. 108756
Author(s):  
Tilman Hickethier ◽  
Jan Robert Kroeger ◽  
Simon Lennartz ◽  
Jonas Doerner ◽  
David Maintz ◽  
...  
Keyword(s):  
Image Quality ◽  
Contrast Medium ◽  
Chest Ct ◽  
Venous Phase ◽  
Monoenergetic Images ◽  
Medium Dose

Single rotation CTA of extracranial carotids integrated with cerebral CTP provides sufficient quality for decision making in patients with ischaemic stroke

2020 ◽  
pp. 197140092097458
Author(s):  
Siong Chuong Wong ◽  
Klaus A Hausegger ◽  
Luca De Paoli
Keyword(s):  
Computed Tomography ◽  
Decision Making ◽  
Image Quality ◽  
Ischaemic Stroke ◽  
Contrast Medium ◽  
Computed Tomography Angiography ◽  
Hounsfield Units ◽  
Computed Tomography Perfusion ◽  
Symptomatic Carotid ◽  
Cerebral Computed Tomography

Purpose Large volume computed tomography scanners with 16 cm Z-axis single rotation coverage enable joggle-mode scanning of cerebral computed tomography perfusion and single rotation computed tomography angiography of cervical arteries. Our study aims to evaluate the feasibility of scanning cervical arteries, acquired with single rotation computed tomography angiography during computed tomography perfusion in ischaemic stroke patients. Materials and methods A total of 143 patients were scanned with a single contrast medium injection of 60 ml. Hounsfield units of the cervical arteries and veins were objectively measured and carotid bifurcations were subjectively reviewed. The incidence of artefacts and supra-aortic vessel coverage was recorded. Results Single rotation computed tomography angiography of the neck demonstrated supra-aortic vessels to their origins in 58 (40.6%) patients. Ninety-nine per cent (1140/1152) of arterial segments were adequately opacified (≥150 Hounsfield units). Arteries were adequately contrasted compared to veins in 81.3% (915/1126) of segments. However, the opacification was reversed in 14.0% (158/1126) of segments, indicating a delayed timing of acquisition; 95.5% (273/286) of carotid bifurcations were of good image quality. Measurement of internal carotid artery stenosis in single rotation computed tomography angiography according to the North American Symptomatic Carotid Endarterectomy Trial correlated well with digital subtraction angiography ( R=0.87, P<0.05). Significant artefacts resulted from metal/dental implants (10.5%), contrast in central veins (7.7%) and the shoulder region (4.9%). Conclusion Single rotation computed tomography angiography of the neck incorporated into cerebral computed tomography perfusion with single contrast medium administration revealed adequate image quality for further decision-making in our patient sample. The main drawbacks were inadequate coverage of supra-aortic arteries and possible delay in timing of the joggle.

scholarly journals Kidney and Urinary Tract Imaging: Triple-Bolus Multidetector CT Urography as a One-Stop Shop—Protocol Design, Opacification, and Image Quality Analysis

Radiology ◽  
2010 ◽  
Vol 255 (2) ◽  
pp. 508-516 ◽  
Author(s):  
Maka Kekelidze ◽  
Roy S. Dwarkasing ◽  
Marcel L. Dijkshoorn ◽  
Karolina Sikorska ◽  
Paul C. M. S. Verhagen ◽  
...  
Keyword(s):  
Urinary Tract ◽  
Image Quality ◽  
Multidetector Ct ◽  
Protocol Design ◽  
Quality Analysis ◽  
Ct Urography ◽  
Image Quality Analysis ◽  
One Stop
Sign in / Sign up

Export Citation Format

Share Document