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    • 1. 发明授权
    • 엠알아이(MRI)장치
    • KR100311074B1
    • 2001-12-28
    • KR1019970029310
    • 1997-06-30
    • 삼성전자주식회사
    • 임용규이완조현화
    • A61B5/055
    • PURPOSE: An MRI(Magnetic Resonance Imaging) apparatus is provided to measure the offset voltage and gain of a DAC, and to correct waveform data using the measured results. CONSTITUTION: A digital processing unit(21) calculates a gradient magnetic field and RF waveform. First, second DACs(22,23) convert the gradient magnetic field data and RF waveform data from the digital processing unit(21) into analog signals. A gradient magnetic field amp(24) amplifies the gradient magnetic field waveform from the first DAC(22). A modulator(25) modulates the RF waveform from the second DAC(23). An RF amp(26) amplifies the RF signal from the modulator. An RF transmission coil(27) receives the RF signal from the RF amp(26) to transmit the RF signal. A gradient magnetic field coil(28) receives the output from the gradient magnetic field amp(24) to generate a gradient magnetic field. First, second correctors(22b,23b) respectively correct the digital inputs of the first, second DACs(22,23) so as to offset the results of first/second gain/offset voltage meters(22a,23a).
    • 2. 发明授权
    • 자기공명영상시스템의스캔프로세서
    • 磁共振成像系统扫描处理器
    • KR100343215B1
    • 2002-08-22
    • KR1019970041969
    • 1997-08-28
    • 삼성전자주식회사
    • 조현화이완임용규
    • A61B5/055
    • PURPOSE: A scan processor of a magnetic resonance imaging system is provided to reduce the complexity of system by using a digital signal processor to generate waveform in real-time. CONSTITUTION: An image processing unit(11) collects image data and reconstructs an image from the collected image data. A waveform generator(12) generates a pulse sequence comprised of an RF(Radio Frequency) pulse and a gradient pulse generated from wave data inputted by a host. A signal converting unit converts the digital pulse sequence into an analog form to output it to an RF modulator(15) and a gradient amplifier(17) and converts an analog signal inputted from the RF modulator(15) into a digital signal to output it as the image data. A noise blocking unit(14) transmits the image data inputted from the signal converting unit to the image processing unit(11) in the form of a light and transfers the pulse sequence inputted from the waveform generator(12) to the signal converting unit in the form of a light.
    • 3. 发明公开
    • 엠알아이(MRI)장치
    • MRI设备
    • KR1019990005137A
    • 1999-01-25
    • KR1019970029310
    • 1997-06-30
    • 삼성전자주식회사
    • 임용규이완조현화
    • A61B5/055
    • 본 발명에 따른 MRI 장치는, 경사자계 및 RF 파형을 계산하는 디지탈 프로세싱 유니트와, 경사자계 파형 데이터 및 RF 파형 데이터를 각각 입력받아 아날로그 신호로 변환시키는 제1,제2DAC와, 상기 제1DAC로부터의 경사자계 파형을 입력받아 증폭시키는 경사자계 증폭기와, 상기 제2DAC로부터의 RF 파형을 입력받아 변조시키는 모듈레이터와, 그 모듈레이터로부터의 변조된 RF 신호를 입력받아 증폭시키는 RF 증폭기를 구비하는 MRI 장치에 있어서, 상기 제1,제2DAC의 이득 및 오프셋 전압을 각각 측정하는 제1,제2 이득/오프셋 전압 측정기와, 상기 제1,제2 이득/오프셋 전압 측정기의 측정 결과를 각각 이용하여 상기 제1,제2DAC의 디지탈 입력을 각각 보정하는 제1,제2보정기를 포함한다.
      이와 같은 본 발명에 의하면, DAC의 이득 및 오프셋 전압이 시스템의 동작중에도 보정되므로, MRI 영상의 크기 변화 및 잡음을 줄일 수 있다. 또한, DAC의 이득 및 오프셋 변화를 측정하여 DAC의 고장 여부를 진단할 수 있으므로, 시스템의 유지보수가 용이한 장점이 있다.
    • 5. 发明公开
    • 자기공명 영상장치에서 경사자계 코일에서 발생된노이즈에 의한 환자의 충격 감소방법
    • 通过磁共振成像系统在梯度线圈中产生的噪声减少患者震动的方法
    • KR1020010046445A
    • 2001-06-15
    • KR1019990050221
    • 1999-11-12
    • 삼성전자주식회사
    • 조현화김정회
    • A61B5/055
    • PURPOSE: A method for reducing shock of a patient by noise generated in a gradient coil in a magnetic resonance imaging system is provided to lighten shock, a patient feels when the noise by the gradient coil is generated rapidly. CONSTITUTION: In the method for reducing shock of a patient by noise generated in the gradient coil in the magnetic resonance imaging system, a few stages are included. In the first stage, the photographing is prepared and a patient is set up. In the second stage, the beginning of photographing is informed. In the third stage, the gradient coil for lighting shock is generated. In the fourth stage, the pre-scanning is carried out. In the fifth stage, the scanning is carried out. In the sixth stage, the image is composed and the photographing is finished.
    • 目的:提供一种通过磁共振成像系统中的梯度线圈产生的噪声来减轻患者的冲击的方法,以减轻冲击,当梯度线圈的噪声迅速产生时患者感觉到。 构成:在通过磁共振成像系统中的梯度线圈产生的噪声减少患者的震动的方法中,包括几个阶段。 在第一阶段,准备拍摄并建立患者。 在第二阶段,通知拍摄开始。 在第三阶段,产生用于照明冲击的梯度线圈。 在第四阶段,进行预扫描。 在第五阶段,进行扫描。 在第六阶段,组合图像并完成拍摄。
    • 6. 发明公开
    • 패스트 스핀 에코 영상법에서 위상 부호화 경사 자계펄스의 위상 오류 보정방법
    • 通过使用相位编码梯度脉冲在快速旋转ECHO图像方法来补偿相位误差的方法
    • KR1020010046444A
    • 2001-06-15
    • KR1019990050220
    • 1999-11-12
    • 삼성전자주식회사
    • 조현화
    • A61B5/055
    • G01R33/56554G01R33/5617G01R33/56518
    • PURPOSE: A method for compensating a phase error by using a phase encoding gradient pulse in an FSE(fast spin echo) method of image is provided to deteriorate the phenomenon of ringing artifact or blurring of images, and to improve the contrast of the images and the SNR(signal-to-noise ratio). CONSTITUTION: The FSE method of image is comprised of a 90degree RF pulse, several 180degree RF pulses, selected gradient pulses corresponding to the RF pulses, and several echo trains for applying frequency encoding gradient pulses and phase encoding gradient pulses. In a first step, a tuning bi-polar pulse having an amplitude same with a first phase encoding gradient pulse corresponding to a first 180degree RF pulse is applied between the 90degree RF pulse and the first 180degree RF pulse to find a tuning value. The amplitude of the tuning bi-polar pulse is adjusted so that a former point and a latter point of the tuning bi-polar pulse applied point becomes same. By using the adjusted gradient pulse, the pulse error of the first phase encoding gradient pulse is compensated. In this way, all phase encoding gradient pulses corresponding to the several 180degree RF pulses are compensated. Also, the tuning bi-polar pulse is removed when the image is achieved.
    • 目的:提供一种通过使用图像的FSE(快速自旋回波)方法中的相位编码梯度脉冲来补偿相位误差的方法,以降低图像的振荡伪影或模糊现象,并且改善图像的对比度和 SNR(信噪比)。 构成:图像的FSE方法包括90度RF脉冲,几个180度RF脉冲,对应于RF脉冲的选定梯度脉冲,以及几个用于施加频率编码梯度脉冲和相位编码梯度脉冲的回波串。 在第一步骤中,在90度RF脉冲和第一180度RF脉冲之间施加具有与第一180度RF脉冲相对应的第一相位编码梯度脉冲振幅相同的调谐双极脉冲,以找到调谐值。 调整调谐双极脉冲的幅度被调整,使得调谐双极脉冲施加点的前一点和后一点变得相同。 通过使用调整后的梯度脉冲,补偿第一相位编码梯度脉冲的脉冲误差。 以这种方式,对与多个180度RF脉冲相对应的所有相位编码梯度脉冲进行补偿。 此外,当实现图像时,去除调谐双极脉冲。