Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Reexamination Certificate
2006-07-04
2006-07-04
Shrivastav, Brij B. (Department: 2859)
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
C324S318000
Reexamination Certificate
active
07071691
ABSTRACT:
A method for operating a magnetic resonance spectrometer with a digital filter whose input is fed with an NMR signal of a time length TA, and whose output signal consists of a rising oscillation B1of a length TB, a signal portion [F]′ which consists of a filtered FID or echo signal of the length TAand a decaying oscillation B2of a length TB, wherein this output signal is initially modified using a calculation process RV, and is subsequently transformed by Fourier transformation to a desired NMR spectrum, is characterized in that, during the calculation process RV, only the signal portion [F]′ is initially selected, at least N copies of the rising oscillation B1are subsequently generated in positive time shifts TAwith respect to each other and are positioned on the signal portion [F′] in time such that the end of the first rising oscillation is positioned at the end of the signal portion, at least N copies of the decaying oscillation B2are generated in negative shifts TAand are positioned on the signal portion [F′] in time such that the start of the first decaying oscillation is positioned at the start of the signal portion [F′], and all N copies of the rising oscillation B1defined in this manner and N copies of the decaying oscillation B2defined in this manner are added to the signal portion [F′], and only the range TAthereof which contains the signal portion [F′] is selected as resulting signal F″ of the calculation process RV, wherein the number N is to be calculated using the formula N=TB/TAand rounded to the next higher integer number. This exactly compensates for the influence of the group delay time of digital, linear-phased filters in a mathematically exact manner.
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Lendi Pietro
Tschopp Werner
Bruker Biospin AG
Shrivastav Brij B.
Vincent Paul
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