scholarly journals Analysis of the Influence of 4D MR Angiography Temporal Resolution on Time-to-Peak Estimation Error for Different Cerebral Vessel Structures

2012 ◽  
Vol 33 (11) ◽  
pp. 2103-2109 ◽  
Author(s):  
N.D. Forkert ◽  
T. Illies ◽  
D. Möller ◽  
H. Handels ◽  
D. Säring ◽  
...  
Keyword(s):  
Temporal Resolution ◽  
Mr Angiography ◽  
Estimation Error ◽  
Cerebral Vessel ◽  
Time To Peak

Time-resolved, contrast-enhanced 3D MR angiography in the subclavian steal effect

VASA ◽  
2010 ◽  
Vol 39 (1) ◽  
pp. 85-93 ◽  
Author(s):  
Schubert
Keyword(s):  
Mr Angiography ◽  
Time Resolved ◽  
Time To Peak ◽  
Vertebral Arteries ◽  
Subclavian Steal ◽  
Cerebrovascular Events ◽  
Graphic Analysis ◽  
Contrast Enhanced ◽  
Hemodynamic Information ◽  
Supraaortic Vessels

The subclavian steal effect indicates atherosclerotic disease of the supraaortic vessels but rarely causes cerebrovascular events in itself. Noninvasive imaging providing detailed anatomic as well as hemodynamic information would therefore be desirable. From a group of 25 consecutive patients referred for MR angiography, four with absent or highly attenuated signal in one of the vertebral arteries on 3D multislab time-of-flight MR angiography were selected to undergo 3D time-resolved contrast-enhanced MR angiography. The time-resolved 3D contrast series (source images and MIPs) were evaluated visually and by graphic analysis of time-intensity curves derived from the respective V1 and V3 segments of both vertebral arteries on the source images. In two cases with high-grade proximal left subclavian stenosis, time-resolved 3D ce-MRA was able to visualise retrograde contrast filling of the left VA. There was a marked delay in time-to-peak between the left and right V1 segments in one case and a shallower slope of enhancement in another. In the other two cases, there was complete or collateralised segmental occlusion of the VAs.

scholarly journals Temporal load resolution impact on PV/grid system energy flows

2018 ◽  
Vol 240 ◽  
pp. 04003 ◽  
Author(s):  
Marek Jaszczur ◽  
Qusay Hassan ◽  
Janusz Teneta
Keyword(s):  
Temporal Resolution ◽  
System Analysis ◽  
Estimation Error ◽  
Energy System ◽  
Photovoltaic System ◽  
Acquisition Time ◽  
Storage Unit ◽  
Time Step ◽  
Energy Flows ◽  
Pv Grid

In this paper, an investigation of the electrical load temporal resolution on the PV/Grid energy system flows, and self-consumption is done in order to determine the optimum parameters for modelling and simulation. The analysed PV/Grid power systems include a photovoltaic system with the nominal power of Pmax@STC=1.5, 2.5, 3.5 kW without storage unit connected to the grid. The results show that the temporal load resolution may have a high impact on energy flows as well as can be a critical issue for the system analysis accuracy even for the single household. It has been found that the load temporal resolution for energy consumption of 1-min yields reliable results, while data resolutions of 5 and 15 min are still sufficient, however, in that case, the daily electrical energy flows and in consequence energy self-consumption estimation error for selected days may exceed 15%. Acquisition time step longer than 15-minutes may increase error above 20% and from the designer’s point of view should not be used. The high and low temporal resolution experimental data of the electricity consumption (load) for a household are available in digital form on the author’s website http://home.agh.edu.pl/jaszczur.

Triple-TWIST MRA: high spatial and temporal resolution MR angiography of the entire peripheral vascular system using a time-resolved 4D MRA technique

2012 ◽  
Vol 23 (1) ◽  
pp. 298-306 ◽  
Author(s):  
Sonja Kinner ◽  
Harald H. Quick ◽  
Stefan Maderwald ◽  
Peter Hunold ◽  
Jörg Barkhausen ◽  
...  
Keyword(s):  
Temporal Resolution ◽  
Mr Angiography ◽  
Vascular System ◽  
Peripheral Vascular ◽  
Time Resolved

scholarly journals Ferumoxytole-enhanced 4D MR angiography with retrospectively defined temporal resolution

2016 ◽  
Vol 18 (S1) ◽  
Author(s):  
Ziwu Zhou ◽  
Fei Han ◽  
Yu Gao ◽  
Takegawa Yoshida ◽  
Peng Hu ◽  
...  
Keyword(s):  
Temporal Resolution ◽  
Mr Angiography

scholarly journals High spatial and temporal resolution imaging of the arterial vasculature of the lower extremity with contrast enhanced mr angiography

2011 ◽  
Vol 24 (4) ◽  
pp. 478-488 ◽  
Author(s):  
Petrice M. Mostardi ◽  
Clifton R. Haider ◽  
James F. Glockner ◽  
Phillip M. Young ◽  
Stephen J. Riederer
Keyword(s):  
Lower Extremity ◽  
Temporal Resolution ◽  
Mr Angiography ◽  
Contrast Enhanced ◽  
Resolution Imaging

scholarly journals Unenhanced Dynamic MR Angiography: High Spatial and Temporal Resolution by Using True FISP–based Spin Tagging with Alternating Radiofrequency

Radiology ◽  
2010 ◽  
Vol 256 (1) ◽  
pp. 270-279 ◽  
Author(s):  
Lirong Yan ◽  
Sumei Wang ◽  
Yan Zhuo ◽  
Ronald L. Wolf ◽  
Michael F. Stiefel ◽  
...  
Keyword(s):  
Temporal Resolution ◽  
Mr Angiography ◽  
Spin Tagging ◽  
True Fisp ◽  
Dynamic Mr

scholarly journals MR Angiography acceleration techniques with iterative reconstructions: the IT-TWIST sequence

2021 ◽  
Author(s):  
Curatolo Calogero
Keyword(s):  
Blood Vessels ◽  
Temporal Resolution ◽  
Iterative Reconstruction ◽  
Mr Angiography ◽  
Physical Characteristics ◽  
Time Resolved ◽  
Non Invasive ◽  
Acceleration Techniques ◽  
Reconstruction Time

In recent years MR Angiography allowed to assess blood vessels and flow in a non-invasive way. The aim of our work was to illunstrate a modern MR Angiography technique, the 4D Iterative reconstruction Time resolved angiography With Interleaved Stochastic Trajectories (IT-TWIST), capable to generate angiograms with high spatial and temporal resolution, providing multiple and continuous post-contrastographic sets of images. Technological and physical characteristics are reported in detail and consequent advantages are summarized.

Diagnostic value of high spatial and temporal resolution time-resolved MR angiography in the workup of peripheral high-flow vascular malformations at 1.5 Tesla

2011 ◽  
Vol 28 (4) ◽  
pp. 823-834 ◽  
Author(s):  
Ulrich Kramer ◽  
Ulrike Ernemann ◽  
Stefanie Mangold ◽  
Achim Seeger ◽  
Christiane Bretschneider ◽  
...  
Keyword(s):  
Temporal Resolution ◽  
Mr Angiography ◽  
Vascular Malformations ◽  
Diagnostic Value ◽  
High Flow ◽  
Resolution Time ◽  
Time Resolved

Thorax: Low-Dose Contrast-enhanced Three-dimensional MR Angiography with Subsecond Temporal Resolution—Initial Results

Radiology ◽  
2002 ◽  
Vol 224 (3) ◽  
pp. 896-904 ◽  
Author(s):  
J. Paul Finn ◽  
Visveshwar Baskaran ◽  
James C. Carr ◽  
Richard M. McCarthy ◽  
F. Scott Pereles ◽  
...  
Keyword(s):  
Temporal Resolution ◽  
Mr Angiography ◽  
Low Dose ◽  
Three Dimensional ◽  
Contrast Enhanced ◽  
Initial Results
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