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Optimized signal to noise ratio

  • US 4,859,945 A
  • Filed: 05/03/1988
  • Issued: 08/22/1989
  • Est. Priority Date: 05/03/1988
  • Status: Expired due to Term
First Claim
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1. A method of optimizing the signal-to-noise ratio (SNR) of magnetic resonance images (MRI) in echo acquisition scan sequences providing echoes at times (TE) after application of a first radio frequency (RF) pulse, said method comprising the steps of:

  • using said echo acquisition sequence to generate echo signals,detecting a first echo signal during the application of an initial view gradient,sampling the detected echo signal at a sampling rate determining a sampling time,filtering the sampled signal through a receiving filter having a variable bandwidth,providing a subsequent view gradient of decreased amplitude compared to said initial view gradient during the detection of subsequent echo signals, anddecreasing the bandwidth of the receiving filter responsive to the reduction of the subsequent view gradient amplitude to improve the SNR.

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