Refine
Year of publication
- 2013 (285) (remove)
Institute
- Fachbereich Medizintechnik und Technomathematik (63)
- Fachbereich Elektrotechnik und Informationstechnik (43)
- INB - Institut für Nano- und Biotechnologien (39)
- Fachbereich Energietechnik (34)
- Fachbereich Wirtschaftswissenschaften (32)
- Fachbereich Chemie und Biotechnologie (29)
- IfB - Institut für Bioengineering (28)
- Fachbereich Luft- und Raumfahrttechnik (26)
- Fachbereich Bauingenieurwesen (17)
- Fachbereich Maschinenbau und Mechatronik (15)
- Fachbereich Architektur (7)
- Solar-Institut Jülich (7)
- Fachbereich Gestaltung (6)
- Sonstiges (6)
- Nowum-Energy (4)
- ECSM European Center for Sustainable Mobility (2)
- IBB - Institut für Baustoffe und Baukonstruktionen (1)
- MASKOR Institut für Mobile Autonome Systeme und Kognitive Robotik (1)
- ZHQ - Bereich Hochschuldidaktik und Evaluation (1)
Has Fulltext
- no (285) (remove)
Document Type
- Article (138)
- Conference Proceeding (74)
- Part of a Book (25)
- Book (23)
- Report (9)
- Doctoral Thesis (5)
- Patent (4)
- Other (2)
- Conference: Meeting Abstract (1)
- Contribution to a Periodical (1)
Keywords
- Mathematik (2)
- industrial research (2)
- metal structure (2)
- steel (2)
- Bacillus atrophaeus (1)
- Business Models (1)
- Direkteinblasung (1)
- Distorsion des oberen Sprunggelenks (1)
- IT Products (1)
- IT-Marketing (1)
Purpose
To design and evaluate a modular transceiver coil array with 32 independent channels for cardiac MRI at 7.0T.
Methods
The modular coil array comprises eight independent building blocks, each containing four transceiver loop elements. Numerical simulations were used for B1+ field homogenization and radiofrequency (RF) safety validation. RF characteristics were examined in a phantom study. The array's suitability for accelerated high spatial resolution two-dimensional (2D) FLASH CINE imaging of the heart was examined in a volunteer study.
Results
Transmission field adjustments and RF characteristics were found to be suitable for the volunteer study. The signal-to-noise intrinsic to 7.0T together with the coil performance afforded a spatial resolution of 1.1 × 1.1 × 2.5 mm3 for 2D CINE FLASH MRI, which is by a factor of 6 superior to standardized CINE protocols used in clinical practice at 1.5T. The 32-channel transceiver array supports one-dimensional acceleration factors of up to R = 4 without impairing image quality significantly.
Conclusion
The modular 32-channel transceiver cardiac array supports accelerated and high spatial resolution cardiac MRI. The array is compatible with multichannel transmission and provides a technological basis for future clinical assessment of parallel transmission techniques at 7.0T.
We present a sensor concept based on copper(II)oxide (CuO) nanofibres for the detection of hydrogen peroxide (H2O2) vapour in the percent per volume (% v/v) range. The fibres were produced by using the electrospinning technique. To avoid water condensation in the pores, the fibres were initially modified by an exposure to H2S to get an enclosed surface. By a thermal treatment at 350 °C the fibres were oxidised back to CuO. Thereby, the visible pores disappear which was verified by SEM analysis. The fibres show a decrease of resistance with increasing H2O2 concentration which is due to the fact that hydrogen peroxide is an oxidising gas and CuO a p-type semiconductor. The sensor shows a change of resistance within the minute range to the exposure until the maximum concentration of 6.9% v/v H2O2. At operating temperatures below 450 °C the corresponding sensor response to a concentration of 4.1% v/v increases. The sensor shows a good reproducibility of the signal at different measurements. CuO seems to be a suitable candidate for the detection of H2O2 vapour at high concentrations.
Resistance behaviour of the sensor under exposure to H2O2 vapours between 2.3 and 6.9% v/v at an operating temperature of 450 °C.
Introduction of RePriCo’13
(2013)