TY  - JOUR
A1  - Strohmeier, Andreas
T1  - Siedlungswasserwirtschaft
JF  - Wendehorst Beispiele aus der Baupraxis / Wetzell, Otto W. ; Baumgartner, Herwig ; Wendehorst, Reinhard [Hrsg.].
Y1  - 2007
SN  - 978-3-8351-0069-5
N1  - Kapitel 14
SP  - 395
EP  - 431
PB  - Teubner
CY  - Wiesbaden
ER  - 
TY  - JOUR
A1  - Biener, Ernst
T1  - Abfallwirtschaft
JF  - Wendehorst Beispiele aus der Baupraxis / Wetzell, Otto W. ; Baumgartner, Herwig ; Wendehorst, Reinhard [Hrsg.].
Y1  - 2007
SN  - 978-3-8351-0069-5
N1  - Kapitel 15
SP  - 433
EP  - 463
PB  - Teubner
CY  - Wiesbaden
ER  - 
TY  - JOUR
A1  - Dachwald, Bernd
A1  - McDonald, Malcolm
A1  - McInnes, Colin R.
A1  - Mengali, Giovanni
T1  - Impact of Optical Degradation on Solar Sail Mission Performance
JF  - Journal of Spacecraft and Rockets. 44 (2007), H. 4
Y1  - 2007
SN  - 0022-4650
N1  - 2. ISSN: 1533-6794
SP  - 740
EP  - 749
ER  - 
TY  - JOUR
A1  - Dachwald, Bernd
A1  - Wi, Bong
T1  - Solar Sail Kinetic Energy Impactor Trajectory Optimization for an Asteroid-Deflection Mission
JF  - Journal of Spacecraft and Rockets. 44 (2007), H. 4
Y1  - 2007
SN  - 0022-4650
N1  - 2. ISSN: 1533-6794
SP  - 755
EP  - 764
ER  - 
TY  - JOUR
A1  - Dachwald, Bernd
A1  - Ohndorf, A.
T1  - 1st ACT Global Trajectory Optimisation Competition : Results found at DLR
JF  - Acta Astronautica. 61 (2007), H. 9
Y1  - 2007
SN  - 0094-5765
N1  - Global Trajectory Optimization ;  Results of the First Competition Organised by the Advanced Concept Team (ACT) of the European Space Agency (ESA)
SP  - 742
EP  - 752
ER  - 
TY  - JOUR
A1  - Biener, Ernst
T1  - Abfallwirtschaft
JF  - Bautechnische Zahlentafeln / Wendehorst, Reinhard ; Wetzell, Otto W. [Hrsg.] 32., vollst. aktualisierte Aufl.
Y1  - 2007
SN  - 978-3-8351-0055-8
SP  - 1291
EP  - 1330
PB  - Teubner
CY  - Stuttgart
ER  - 
TY  - JOUR
A1  - Strohmeier, Andreas
T1  - Siedlungswasserwirtschaft
JF  - Bautechnische Zahlentafeln / Wendehorst, Reinhard ; Wetzell, Otto W. [Hrsg.] 32., vollst. aktualisierte Aufl.
Y1  - 2007
SN  - 978-3-8351-0055-8
SP  - 1193
EP  - 1289
PB  - Teubner
CY  - Stuttgart
ER  - 
TY  - JOUR
A1  - Feiser, Johannes
T1  - Geotechnik
JF  - Bautechnische Zahlentafeln / Wendehorst, Reinhard ; Wetzell, Otto W. [Hrsg.] 32., vollst. aktualisierte Aufl.
Y1  - 2007
SN  - 978-3-8351-0055-8
SP  - 1027
EP  - 1136
PB  - Teubner
CY  - Stuttgart
ER  - 
TY  - JOUR
A1  - Lohse, Wolfram
T1  - Stahlbau
JF  - Bautechnische Zahlentafeln / Wendehorst, Reinhard ; Wetzell, Otto W. [Hrsg.] 32., vollst. aktualisierte Aufl.
Y1  - 2007
SN  - 978-3-8351-0055-8
SP  - 607
EP  - 757
PB  - Teubner
CY  - Stuttgart
ER  - 
TY  - CHAP
A1  - Müller-Veggian, Mattea
A1  - Kops, Elena Rota
A1  - Quin, Peng
A1  - Herzog, Hans
T1  - MRI Based Attenuation Correction for Brain PET Images
T2  - Advances in medical engineering / [3rd RPT - Remagener Physiktage together with the Second Scientific Workshop of Medical Robotics, Navigation and Visualization ... Remagen ... 7.-9. März 2007]. Thorsten M. Buzug (ed.) Part 1.
N2  - This work describes a procedure to yield attenuation maps from MR images which are used for the absorption correction (AC) of brain PET data. Such an approach could be mandatory for future combined PET and MRI scanners, which probably do not include a transmission facility. T1-weighted MR images were segmented into brain tissue, bone, soft tissue, and sinus; attenuation coefficients corresponding to elemental composition and density as well as to 511 keV photon energy were respectively assigned. Attenuation maps containing up to four compartments were created and forward projected into sinograms with attenuation factors which then were used for AC during reconstruction of FDG-PET data. The commonly used AC based on a radioactive (68Ge) transmission scan served as reference. The reconstructed radioactivity values obtained with the MRI-based AC were about 20% lower than those obtained with PET-based AC if the skull was not taken into account. Considering the skull the difference was still about 10%. Our investigations demonstrate the feasibility of a MRI-based AC, but revealed also the necessity of a satisfying delineation of bone thickness which tends to be underestimated in our first approach of T1-weighted MR image segmentation.
Y1  - 2007
SN  - 978-3-540-68763-4
U6  - http://dx.doi.org/10.1007/978-3-540-68764-1_15
N1  - Springer proceedings in physics ; 114
SP  - 93
EP  - 97
PB  - Springer
CY  - Berlin
ER  -