Signal transmission device and magnetic resonance imaging system
A technology of signal transmission and magnetic resonance signals, applied in the fields of sensors, medical science, diagnostic recording/measurement, etc., can solve the problems of poor practicability and complex structure, and achieve the effect of simple structure, avoiding mutual interference, and reducing complexity
Active Publication Date: 2015-09-02
WUHAN ZHONGKE IND RES INST OF MEDICAL SCI CO LTD
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[0006] However, the use of a switch matrix to form a signal transmission channel requires a large number of switching devices. In order to control these switching devices, a large number of FPGAs (Field-Programmable Gate Array, Field Programmable Gate Array) are required to generate control signals. Due to the existence of these radio frequency circuits, it is necessary to Match each path, which makes the structure of this method very complicated and less practical
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[0028] As mentioned in the background art, when a traditional switch matrix is used to form a signal transmission channel, a large number of switches is required, and a large number of FPGAs are also required to control these switches. On the one hand, such a structure is complex and takes up a large space; on the other hand, a large number of radio frequency circuits will also bring difficulties to the matching of each channel.
[0029] As a specific example, assume that the signal transmission paths of the prior art include 72 inputs and 48 outputs, then 1728 switches (i.e. 72*48 / 2=1728) are needed when a switch matrix is used to realize signal transmission; in order to control these Closing or opening of 1728 switches requires 3456 control signals, so more than a dozen FPGAs will be needed to realize these control signals.
[0030] In the signal transmission device of the present invention, a plurality of mixers are respectively used to mix the input signals to form mul...
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The invention discloses a signal transmitting device and a magnetic resonance imaging system. The signal transmitting device comprises a signal combining unit, multiple mixers, multiple band-pass filters and multiple signal demodulators. The mixers output mixing signals of input signals and local oscillation signals. The signal combining unit comprises multiple band-stop filters. The input ends of the band-stop filters are correspondingly connected with the output ends of the mixers respectively and used for receiving the mixing signals. The output ends of the band-stop filters are connected together and used for transmitting the mixing signals simultaneously. The input ends of the band-pass filters are connected together and used for receiving the mixing signals transmitted by the signal combining unit. The output ends of the band-pass filters are used for outputting the mixing signals which fall into the corresponding band-pass frequencies of the band-pass filters. The signal demodulators are correspondingly connected with the output ends of the band-pass filters respectively and used for demodulating the signals output by the band-pass filters. The signal transmitting device is simple in structure.
Description
technical field [0001] The invention relates to the technical field of magnetic resonance imaging, in particular to a signal transmission device and a magnetic resonance imaging system. Background technique [0002] Magnetic Resonance Imaging (MRI) technology is widely used in the medical field. In a magnetic resonance imaging system, multiple data signals need to be transmitted in order to finally form a medical image. [0003] In traditional technology, a switch matrix is usually used to form a channel for signal transmission. Each switch has two control terminals, and the state of each switch is controlled by a control circuit to select a channel. figure 1 That is, it shows a schematic diagram of using a switch matrix to form a signal transmission channel in the prior art. [0004] refer to figure 1 , the switch matrix 2 is composed of a plurality of switching devices 20 and a plurality of control circuits 26 . Specifically, the control circuit 26 is correspondingly...
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IPC IPC(8): A61B5/055
Inventor 包长虹吴尚桐
Owner WUHAN ZHONGKE IND RES INST OF MEDICAL SCI CO LTD