公开(公告)号：KR1020010000425A

公开(公告)日：2001-01-05

申请号：KR1020000056881

申请日：2000-09-28

Applicant: 대한민국(전남대학교총장)

Inventor： 김대진 ,  양문환 ,  염승기

IPC: A61B5/055

Abstract: PURPOSE: A RF variable filter circuit in a magnetic resonant imaging modem by a tracking filter is provided to filter intensities of all magnetic fields by a simple operation regardless of an intensity of a magnetic field. CONSTITUTION: An erasable and programmable read only memory(1) and a digital/analog converter(2) are connected to each other in series and support various intensities of magnetic fields. The erasable and programmable read only memory(1) and digital/analog converter(2) are inserted into a frequency variable tracking filter(3) which changes a frequency. The digital/analog converter(2) converts data stored in erasable and programmable read only memory(1) into an analog signal. The analog signal from the digital/analog converter(2) is provided to the frequency variable tracking filter(3). The frequency variable tracking filter(3) controls the analog signal from the digital/analog converter(2) according to a control signal. The control signal includes a resonant frequency signal suitable to each magnetic field and element.

Abstract translation: 目的：提供通过跟踪滤波器在磁共振成像调制解调器中的RF可变滤波器电路，通过简单的操作来滤除所有磁场的强度，而不管磁场的强度如何。 构成：可擦除可编程只读存储器（1）和数字/模拟转换器（2）彼此串联连接，并支持各种强度的磁场。 可擦除可编程只读存储器（1）和数字/模拟转换器（2）被插入到频率变化跟踪滤波器（3）中，频率变化跟踪滤波器（3）改变频率。 数字/模拟转换器（2）将存储在可擦除和可编程只读存储器（1）中的数据转换为模拟信号。 来自数字/模拟转换器（2）的模拟信号被提供给频率可变跟踪滤波器（3）。 频率可变跟踪滤波器（3）根据控制信号控制来自数/模转换器（2）的模拟信号。 控制信号包括适合于每个磁场和元件的谐振频率信号。