Refine
Year of publication
- 2005 (303) (remove)
Institute
- Fachbereich Medizintechnik und Technomathematik (48)
- Fachbereich Maschinenbau und Mechatronik (43)
- Fachbereich Luft- und Raumfahrttechnik (41)
- Fachbereich Energietechnik (39)
- Fachbereich Wirtschaftswissenschaften (29)
- Fachbereich Elektrotechnik und Informationstechnik (25)
- IfB - Institut für Bioengineering (24)
- Fachbereich Chemie und Biotechnologie (20)
- Fachbereich Bauingenieurwesen (18)
- INB - Institut für Nano- und Biotechnologien (17)
Language
- German (170)
- English (130)
- Portuguese (2)
- Spanish (1)
Document Type
- Article (188)
- Conference Proceeding (37)
- Book (30)
- Lecture (18)
- Part of a Book (12)
- Patent (6)
- Other (3)
- Part of a Periodical (3)
- Doctoral Thesis (2)
- Diploma Thesis (1)
Keywords
- Rapid Prototyping (6)
- Übungsklausur (5)
- Aachen University of Applied Sciences (3)
- Bauingenieurwesen (3)
- CAD (3)
- Fachhochschule Aachen (3)
- Fertigungsverfahren (3)
- Regelungstechnik (3)
- civil engineering (3)
- Karosseriebau (2)
The ClearPET™ project: Development of a 2nd generation high-performance small animal PET scanner
(2005)
Second generation high-performance PET scanners, called ClearPET™1, have been developed by working groups of the Crystal Clear Collaboration (CCC). High sensitivity and high spatial resolution for the ClearPET camera is achieved by using a phoswich arrangement combining two different types of lutetium-based scintillator materials: LSO from CTI and LuYAP:Ce from the CCC (ISTC project). In a first ClearPET prototype, phoswich arrangements of 8×8 crystals of 2×2×10 mm3 are coupled to multi-channel photomultiplier tubes (Hamamatsu R7600). A unit of four PMTs arranged in-line represents one of 20 sectors of the ring design. The opening diameter of the ring is 120 mm, the axial detector length is 110 mm.The PMT pulses are digitized by free-running ADCs and digital data processing determines the gamma energy, the phoswich layer and even the exact pulse starting time, which is subsequently used for coincidence detection. The gantry allows rotation of the detector modules around the field of view.
Preliminary data shows a correct identification of the crystal layer about (98±1)%. Typically the energy resolution is (23.3±0.5)% for the luyap layer and (15.4±0.4)% for the lso layer. early studies showed the timing resolution of 2 ns FWHM and 4.8 ns FWTM. the intrinsic spatial resolution ranges from 1.37 mm to 1.61 mm full-width of half-maximum (FWHM) with a mean of 1.48 mm FWHM. further improvements in image and energy resolution are expected when the system geometry is fully modeled.
One of the most important parameters in a burning chamber - in power stations, in waste to energy plants - is the temperature. This temperature is in the range of 700-1500 °C - one of the most advanced measuring methods being the acoustic pyrometry with the possibility of producing temperature mapping in one level of the burning chamber - comparable to computer tomography. The results of these measurements discussed in the presentation can be used - to fulfil the legal requirements in the FRG or in the EU - to equalise the temperature in one level of the burning chamber to optimise the steam production (better efficiency of the plant) and to minimise the production of temperature controlled flue gas components (NO, CO a. o.) - to control the SNCR-process if used.
Technische Thermodynamik
(2005)