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Year of publication
- 2011 (182) (remove)
Institute
- Fachbereich Medizintechnik und Technomathematik (69)
- INB - Institut für Nano- und Biotechnologien (36)
- Fachbereich Elektrotechnik und Informationstechnik (25)
- Fachbereich Chemie und Biotechnologie (22)
- IfB - Institut für Bioengineering (22)
- Fachbereich Wirtschaftswissenschaften (19)
- Fachbereich Energietechnik (13)
- Fachbereich Bauingenieurwesen (12)
- Fachbereich Maschinenbau und Mechatronik (10)
- Fachbereich Luft- und Raumfahrttechnik (9)
Document Type
- Article (182) (remove)
Keywords
- Arthosetherapie (1)
- Bioreaktor (1)
- Blutzellenlagerung (1)
- Gonarthrose (1)
- Harnleiter (1)
- Hemoglobin structure (1)
- High field MRI (1)
- Hämoglobin (1)
- Hämoglobinstruktur (1)
- Kniegelenkarthrose (1)
This paper presents a novel numerical procedure for computing limit and shakedown loads of structures using a node-based smoothed FEM in combination with a primal–dual algorithm. An associated primal–dual form based on the von Mises yield criterion is adopted. The primal-dual algorithm together with a Newton-like iteration are then used to solve this associated primal–dual form to determine simultaneously both approximate upper and quasi-lower bounds of the plastic collapse limit and the shakedown limit. The present formulation uses only linear approximations and its implementation into finite element programs is quite simple. Several numerical examples are given to show the reliability, accuracy, and generality of the present formulation compared with other available methods.
Miyamoto, Ko-ichiro ; Wagner, Torsten ; Mimura, Shuhei ; Kanoh, Shiníchiro ; Yoshinobu, Tatsuo ; Schöning, Michael Josef
Reisert, Steffen ; Geissler, H. ; Florke, R. ; Wagner, P. ; Wagner, Torsten ; Schöning, Michael Josef
Dieringer, Matthias A. ; Renz, Wolfgang ; Lindel, Tomasz Dawid ; Seifert, Frank ; Frauenrath, Tobias ; von Knobelsdorf-Brenkenhoff, Florian ; Waiczies, Helmar ; Hoffmann, Werner ; Rieger, Jan ; Pfeiffer, Harald ; Ittermann, Bernd ; Schulz-Menger, Jeanette ; Niendorf, Thoralf
Purpose
To design and evaluate a four-channel cardiac transceiver coil array for functional cardiac imaging at 7T.
Materials and Methods
A four-element cardiac transceiver surface coil array was developed with two rectangular loops mounted on an anterior former and two rectangular loops on a posterior former. specific absorption rate (SAR) simulations were performed and a Burn:x-wiley:10531807:media:JMRI22451:tex2gif-stack-1 calibration method was applied prior to obtain 2D FLASH CINE (mSENSE, R = 2) images from nine healthy volunteers with a spatial resolution of up to 1 × 1 × 2.5 mm3.
Results
Tuning and matching was found to be better than 10 dB for all subjects. The decoupling (S21) was measured to be >18 dB between neighboring loops, >20 dB for opposite loops, and >30 dB for other loop combinations. SAR values were well within the limits provided by the IEC. Imaging provided clinically acceptable signal homogeneity with an excellent blood-myocardium contrast applying the Burn:x-wiley:10531807:media:JMRI22451:tex2gif-stack-2 calibration approach.
Conclusion
A four-channel cardiac transceiver coil array for 7T was built, allowing for cardiac imaging with clinically acceptable signal homogeneity and an excellent blood-myocardium contrast. Minor anatomic structures, such as pericardium, mitral, and tricuspid valves and their apparatus, as well as trabeculae, were accurately delineated.