Method for enhancing dynamic range of magnetic resonance signal through scrambling technology

A magnetic resonance signal and dynamic range technology, applied in the field of electronic information, to achieve the effect of improving the dynamic range and improving the spurious-free dynamic range

Active Publication Date: 2021-05-07
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

From the open literature, no one has applied scrambling technology to the link of magnetic resonance acquisition signals

Method used

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  • Method for enhancing dynamic range of magnetic resonance signal through scrambling technology
  • Method for enhancing dynamic range of magnetic resonance signal through scrambling technology
  • Method for enhancing dynamic range of magnetic resonance signal through scrambling technology

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Embodiment Construction

[0023] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0024] Such as figure 1 As shown, a method for enhancing the dynamic range of magnetic resonance signals through scrambling technology of the present invention includes two parts: noise scrambling and noise descrambling, and noise scrambling includes the following steps:

[0025] S1. Add a noise scrambling source distributed in the m1-m2 MHz interval at the signal input end of the magnetic resonance signal acquisition board, and the amplitude of the noise scrambling source is n LSBs; where m2-m1=1, the value range of m2 is 3 to 10; LSB is the quantized signal size of the lowest bit of the analog-to-digital converter used in the magnetic resonance signal acquisition board, and the value range of n is 5 to 15;

[0026] S2. Perform analog-to-digital conversion on the magnetic resonance signal mixed with the noise scrambling source obtained in st...

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Abstract

The invention discloses a method for enhancing the dynamic range of a magnetic resonance signal through a scrambling technology, and the method comprises the following steps of: S1, adding a noise scrambling source distributed in an interval of m1-m2MHz at the signal input end of a magnetic resonance signal collection board, with the amplitude of the noise scrambling source being n LSBs; S2, performing analog-to-digital conversion on the magnetic resonance signal mixed with the noise scrambling source; S3, acquiring a signal of a signal output end of the magnetic resonance signal acquisition board, inputting the signal into a notch filter, and removing additional spectrum components introduced by the noise scrambling source through the notch filter; and S4, carrying out orthogonal demodulation and decimation filtering on the signal. According to the invention, a noise interference source is applied to be mixed into a receiving signal of the magnetic resonance signal acquisition unit, distortion harmonic components caused by coherent sampling and quantization errors in the sampling and quantization process of the analog-to-digital converter are reduced, and the spurious-free dynamic range of the magnetic resonance analog-to-digital converter is improved, so that the dynamic range of magnetic resonance signals is improved.

Description

technical field [0001] The invention belongs to the technical field of electronic information, and in particular relates to a method for enhancing the dynamic range of magnetic resonance signals through scrambling technology. Background technique [0002] Dither is translated into Chinese as "jitter" or "scrambling". The research on foreign Dither technology originated in the middle of the 20th century. In 1951, Goodall WM first proposed dither technology. He introduced a certain amount of Dither signal and input signal into the When the PCM system reproduced the TV image, it was found that the introduction of the Dither signal not only did not deteriorate the image quality, but the image outline caused by the quantization error disappeared, making the image effect seen by the naked eye more perfect. Therefore, he proposed that the dither technology can be used for Reduce image contouring effects due to quantization errors in PCM (Pulse Code Modulation) systems. On this bas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/56
CPCG01R33/5602
Inventor 吴林张涛尧德中余洁刘杭
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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