TY  - GEN
A1  - Lindel, Tomasz Dawid
A1  - Greiser, Andreas
A1  - Waxman, Patrick
A1  - Dietterle, Martin
A1  - Seifert, Frank
A1  - Fontius, Ulrich
A1  - Renz, Wolfgang
A1  - Dieringer, Matthias A.
A1  - Frauenrath, Tobias
A1  - Schulz-Menger, Jeanette
A1  - Niendorf, Thoralf
A1  - Ittermann, Bernd
T1  - Cardiac CINE MRI at 7 T using a transmit array
T2  - 2012 ISMRM Annual Meeting Proceedings
N2  - With its need for high SNR and short acquisition times, Cardiac MRI (CMR) is an intriguing target application for ultrahigh field MRI. Due to the sheer size of the upper torso, however, the known RF issues of 7T MRI are also most prominent in CMR. Recent years brought substantial progress but the full potential of the ultrahigh field for CMR is yet to be exploited. Parallel transmission (pTx) is a promising approach in this context and several groups have already reported B1 shimming for 7T CMR. In such a static pTx application amplitudes and phases of all Tx channels are adjusted individually but otherwise imaging techniques established in current clinical practice 1.5 T and 3 T are applied. More advanced forms of pTx as spatially selective excitation (SSE) using Transmit SENSE promise additional benefits like faster imaging with reduced fields of view or improved SAR control. SSE requires the full dynamic capabilities of pTx, however, and for the majority of today's implemented pTx hardware the internal synchronization of the Tx array does not easily permit external triggering as needed for CMR. Here we report a software solution to this problem and demonstrate the feasibility of CINE CMR at 7 T using a Tx array.
Y1  - 2012
SN  - 1545-4428
N1  - ISMRM 20th Annual Meeting & Exhibition, 5-11 May 2012, Melbourne, Australia
ER  - 
TY  - BOOK
A1  - Gell, Sebastian
T1  - Determinants of earnings forecast error, earnings forecast revision and earnings forecast accuracy
N2  - ​Earnings forecasts are ubiquitous in today’s financial markets. They are essential indicators of future firm performance and a starting point for firm valuation. Extremely inaccurate and overoptimistic forecasts during the most recent financial crisis have raised serious doubts regarding the reliability of such forecasts. This thesis therefore investigates new determinants of forecast errors and accuracy. In addition, new determinants of forecast revisions are examined. More specifically, the thesis answers the following questions: 1) How do analyst incentives lead to forecast errors? 2) How do changes in analyst incentives lead to forecast revisions?, and 3) What factors drive differences in forecast accuracy?
Y1  - 2012
SN  - 978-3-8349-3936-4
SN  - 978-3-8349-3937-1
U6  - https://doi.org/10.1007/978-3-8349-3937-1
N1  - Titel in der Buchreihe: Quantitatives Controlling
PB  - Springer Gabler
CY  - Wiesbaden
ER  -