Radio-frequency transmitting circuit, complex digital synthesizer and magnetic resonance imaging equipment

A transmitting circuit, digital technology, applied in the direction of using nuclear magnetic resonance imaging system for measurement, magnetic resonance measurement, instruments, etc., can solve the problems of rising cost, unstable signal quality, inconsistency of analog parts characteristics, etc., and achieve stability The effect of improvement and cost reduction

Inactive Publication Date: 2003-02-05
GE MEDICAL SYST GLOBAL TECH CO LLC
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  • Summary
  • Abstract
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Problems solved by technology

[0007] However, analog parts inevitably have characteristic inconsistencies that can unpredictably produce instabilities in signal quality
Unpredictable cost increases due to the necessity to select simulated parts with less inconsistency in characteristics

Method used

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  • Radio-frequency transmitting circuit, complex digital synthesizer and magnetic resonance imaging equipment
  • Radio-frequency transmitting circuit, complex digital synthesizer and magnetic resonance imaging equipment
  • Radio-frequency transmitting circuit, complex digital synthesizer and magnetic resonance imaging equipment

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Embodiment Construction

[0058] Several illustrative embodiments of the invention are described below.

[0059] figure 1 is a block diagram showing the MRI apparatus 100 according to the embodiment of the present invention.

[0060] In the MRI apparatus 100, the magnet assembly 1 has a Room Section (hole) in which an examination object is placed. Arranged around the space portion are: a permanent magnet 1p for applying a constant static magnetic field to the object; a gradient magnetic field coil 1g for generating x-axis, y-axis and z-axis Axes combined to form slice gradient axis, read gradient axis, phase encoding gradient axis) gradient magnetic field; transmitting coil 1t, which generates RF pulses for inducing the spin of atomic nuclei in the object; and receiving coil 1r, which detects the nuclear magnetic field from the object resonance (NMR) signal. The gradient magnetic field coil 1g, the transmitting coil 1t, and the receiving coil 1r are connected to the gradient magnetic field driving c...

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Abstract

An RF transmission circuit, complex digital synthesizer and MRI apparatus are intended to enhance the stability of signal quantity and reduce the cost, wherein a complex digital synthesizer generates reference carrier frequency signal data directly in the digital domain, RF envelope mixers combine the resulting data and RF envelope signal data in the digital domain, and a digital frequency up-converter up-converts the resulting signal data in the digital domain and converts into an analog RF pulse signal.

Description

technical field [0001] The present invention relates to RF (Radio Frequency) transmitting circuits, complex digital synthesizers and MRI (Magnetic Resonance Imaging) equipment, in particular, to such RF transmitting circuits, complex digital synthesizers and MRI equipment, which are based on circuit digitization such that Consistency in signal quality is improved while costs are reduced. Background technique [0002] Fig. 15 is a block diagram showing an example of an RF transmission circuit which we believe can be applied to an MRI apparatus. [0003] The RF transmitting circuit 10J is composed of a digital circuit part and an analog circuit part. [0004] The digital circuit part includes: a system connection 20J, which receives control data from a high-ranking circuit controlling scanning; a digital synthesizer 30J, which produces reference carrier frequency signal data under the control of the system interface 20J; and RF envelope Register 71, which holds the RF envelo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/54A61B5/055G01R33/36H04B1/04
CPCG01R33/3607A61B5/055G01R33/54H04B1/04
Inventor 宫野洋行木本昌一
Owner GE MEDICAL SYST GLOBAL TECH CO LLC
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