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EP0104781A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Reception signal processing apparatus in nuclear magnetic resonance diagnostic apparatus

Assignee: Toshiba Corp
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Filing: 1983-08-26
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Granted: —
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Expires: 2003-08-26
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Abstract

Abstract Reception signal processing apparatus in nuclear magnetic resonance diagnostic apparatus to display as an image the distribution of the spin density or relaxation time of specific atomic nuclei existing in an object utilizing nuclear magnetic resonance phenomena including a phase demodulator for phase demodulating a nuclear magnetic resonance signal evoked by nuclear magnetic resonance phenomena in accordance with two reference waves, the phases of which are different by 90°, an analog-to-digital convertor for digitalizing the separated two signals obtained by the phase demodulator, and a noise correction processor for eliminating the low frequency component noises included in the demodulated signals from the phase demodulator to obtain an image without artifacts.

Inventors

  • 👤 Yoshio C/O Patent Division Machida

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 07:45
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/32; G01R33/36; G01R33/3621; G01R33/44; G01R33/48; G01R33/54; G01R33/56; G01R33/5608

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 113 words
Reception signal processing apparatus in nuclear magnetic resonance diagnostic apparatus to display as an image the distribution of the spin density or relaxation time of specified atomic nuclei existing in an object utilizing nuclear magnetic resonance phenomena, the reception signal processing apparatus comprising: means for phase demodulating a nuclear magnetic resonance signal evoked by nuclear magnetic resonance phenomena in accordance with two reference waves having phases differing from one another by 90°: means for digitalizing the separated two signals obtained by said phase demodulating means; and noise correction processing means for eliminating the low frequency component noises included in the demodulated signals from said phase demodulating means to obtain an image without artifacts.
Claim 2
Dependent Claim 113 words
Reception signal processing apparatus in nuclear magnetic resonance diagnostic apparatus to display as an image the distribution of the spin density or relaxation time of specified atomic nuclei existing in an object utilizing nuclear magnetic resonance phenomena, the reception signal processing apparatus comprising: means for phase demodulating a nuclear magnetic resonance signal evoked by nuclear magnetic resonance phenomena in accordance with two reference waves having phases differing from one another by 90°: means for digitalizing the separated two signals obtained by said phase demodulating means; and noise correction processing means for eliminating the low frequency component noises included in the demodulated signals from said phase demodulating means to obtain an image without artifacts.
Claim 3
Dependent Claim 40 words
The reception signal processing apparatus in nuclear magnetic resonance diagnostic apparatus of claim 1 wherein said noise correction processing means is a digital operation apparatus to Fourier transform said digitalized demodulation signals and then to perform a noise correction procedure.
Claim 4
Dependent Claim 41 words
The reception signal processing apparatus in nuclear magnetic resonance diagnostic apparatus of claim 1 wherein said noise correction processing means is a digital operation apparatus to perform noise correction for said digitalized demodulation signals and then to Fourier transform said signals.

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