Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Reexamination Certificate
2006-08-08
2008-10-28
Shrivastav, Brij B (Department: 2831)
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
C324S309000
Reexamination Certificate
active
07443162
ABSTRACT:
In a method and apparatus for generation of magnetic resonance (MR) images based on the TrueFISP sequence with simultaneous acquisition of the MR images of a number of parallel slices of a measurement subject the number of the slices N to be acquired in the measurement subject is established whereby N is at least, the number of the phase coding lines MA per raw data matrix and slice N are established, with the requirement that the quotient of MA and N is a natural number, the repetition time TR, the radio-frequency pulse duration RF and the flip angle α are established, of each raw data matrix is sub-divided into S separate segments to be measured, whereby S is equal to N or a whole-number multiple of N, with the requirement that the quotient Q of MA and S that corresponds to the number of the phase coding lines per segment is a natural number, data are acquired for all segments S of all slices N, whereby the time duration, in msec, TSegfor the acquisition of the data of each segment isTSeg=TR+RF+MAS·TR,and the measurement of all segments S of all slices N is implemented such that the time duration TRelaxis TRelax=(N−1)·TSeg[msec] for the relaxation of the magnetization MZwith the relaxation constant T1in a slice N that corresponds to the time span from the end of the measurement of a first segment up to the beginning of the measurement of a second segment of the same slice.
REFERENCES:
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patent: 6366090 (2002-04-01), Heid
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patent: 6888349 (2005-05-01), Fautz
patent: 2003/0122545 (2003-07-01), Van Den Brink et al.
“Principles and Applications of Balanced SSFP Techniques,” Scheffler et al, Eur. Radiol., vol. 13 (2003) pp. 2049-2418.
“Analysis of Multiple-Acquisition SSFP,” Bangerter et al, Magnetic Resonance in Medicine, vol. 51 (2004) pp. 1038-1047.
“FISP: Eine Neue Schnelle Puls-sequenz für die Kernspintomographie,” Oppelt et al, electromedica, vol. 54, No. 1 (1986) pp. 15-18.
“Magnetization Prepared True FISP Imaging,” Deimling et al, Society of Magnetic Resonance (1994) p. 495.
Schiff & Hardin LLP
Shrivastav Brij B
Siemens Aktiengesellschaft
Vaughn Megann E
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