KR20220115219A - High frequency coil for magnetic resonance imaging system - Google Patents
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Abstract
Description
본 발명은 자기공명영상(MRI: Magnetic Resonance Imaging) 시스템의 RF 코일(Radio Frequency coil)에 관한The present invention relates to an RF coil of a Magnetic Resonance Imaging (MRI) system.
것으로서, 특히 고자장 자기공명영상 시스템에서 인체의 두부(頭部)의 대뇌 피질의 강조 영상을 얻기 위한 다As a result, in particular, it is used to obtain an enhanced image of the cerebral cortex of the human head in a high-field magnetic resonance imaging system.
채널 위상 배열 코일(phased array coil)에 관한 것이다.It relates to a channel phased array coil.
자기공명영상(MRI) 시스템은 인체에 무해하고, 3차원 영상화가 가능하며, 고해상도의 영상을 얻을 수 있다는 등Magnetic resonance imaging (MRI) systems are harmless to the human body, capable of 3D imaging, and can obtain high-resolution images, etc.
의 장점들 때문에 의료 진단 분야에서 널리 쓰이고 있다. 특히, 7T(7 Tesla)의 고자장 MRI 시스템은 기존 1.5TBecause of its advantages, it is widely used in the field of medical diagnosis. In particular, the high magnetic field MRI system of 7T (7 Tesla) is the existing 1.5T
또는 3T의 저자장 MRI 시스템에서보다 높은 신호 대 잡음비(SNR: Signal to Noise Ratio)와 높은 해상도Alternatively, higher signal-to-noise ratio (SNR) and higher resolution than in 3T's low-field MRI system.
(resolution)의 영상을 제공할 수 있고, 대뇌 피질 층의 영상까지도 얻을 수 있어, 뇌 질환 환자들에게 보다 양It can provide high-resolution images, and even images of the cerebral cortex can be obtained, so it is better for patients with brain diseases.
질의 의료 서비스를 제공할 수 있다는 점에서 주목을 받고 있다.It is attracting attention as it can provide quality medical services.
<3> 일반적으로, MRI 시스템에서, RF 코일은 영상을 얻고자 하는 부위, 즉 관심 영역(region of interest)의 스핀들<3> In general, in an MRI system, an RF coil is a spindle of a region to obtain an image, that is, a region of interest.
을 여기(excitation)시키기 위한 RF 필드를 형성하는 역할과, RF 필드로 인하여 세차 운동하는 스핀들로부터 나The role of forming an RF field for excitation of
오는 자장의 변화를 검출하는 역할의 두 가지 기능을 수행한다. MRI 시스템에서 높은 질(high quality)의 영상It performs two functions of detecting changes in the incoming magnetic field. High quality images in MRI systems
을 획득하기 위해서 RF 코일은 이하의 두 가지 조건을 만족해야 한다. 첫째, 코일이 송신을 위해 쓰여질 때에In order to obtain , the RF coil must satisfy the following two conditions. First, when the coil is used for transmission
는, 원하는 관심 영역에 균일한 자기장을 형성하여 핵의 양성자를 여기시켜야 한다. 둘째, 코일이 수신을 위해should form a uniform magnetic field in the desired region of interest to excite protons in the nucleus. Second, for the coil to receive
사용될 때에는 관심 영역에서 같은 이득(gain)으로 RF 신호를 획득해야 한다.When used, the RF signal should be acquired with the same gain in the region of interest.
본 발명의 목적은 전술한 종래 기술의 문제점을 해결하고자 하는 것으로, 7T(7 Tesla)의 고자장An object of the present invention is to solve the problems of the prior art described above, and a high magnetic field of 7T (7 Tesla)
자기공명영상(MRI) 시스템에서, 머리의 대뇌 피질만을 강조 하기 위한, 높은 신호 대 잡음 비(SNR)와 높은 해In magnetic resonance imaging (MRI) systems, high signal-to-noise ratio (SNR) and high resolution for highlighting only the cerebral cortex of the head
상도(resolution)를 가진 RF 코일(Radio Frequency coil)을 제공하는 것이다.It is to provide an RF coil (Radio Frequency coil) with resolution.
본 발명의 일 실시예에 따르면, 자기공명영상(MRI) 시스템용 RF 코일 어셈블리는 새장형 송신 전용 코일 및 다According to an embodiment of the present invention, an RF coil assembly for a magnetic resonance imaging (MRI) system includes a cage type transmission-only coil and multiple
채널 수신 전용 위상 배열 코일을 포함할 수 있다. 일 실시예에서, 상기 다채널 수신 전용 위상 배열 코일은It may include a phased array coil dedicated to channel reception. In one embodiment, the multi-channel receive-only phased array coil
유사 사슬 연결 형태로 서로 연결되어 환형을 이루는 복수의 고리 모양의 수신 전용 코일들을 포함할 수 있다.It may include a plurality of ring-shaped reception-only coils connected to each other in a similar chain connection form to form a ring.
일 실시예에서, 상기 다채널 수신 전용 위상 배열 코일은 상기 송신 전용 코일과 소정의 간격만큼 이격되어 In one embodiment, the multi-channel reception-only phased array coil is spaced apart from the transmission-only coil by a predetermined interval.
상기 송신 전용 코일 내측에 배치될 수 있다.It may be disposed inside the transmission-only coil.
본 발명의 실시예들에 따른 7 테슬라 MRI 시스템에서의 16 채널 위상 배열 코일은, 머리의 주변부에서만 강한The 16-channel phased array coil in the 7 Tesla MRI system according to embodiments of the present invention is strong only in the periphery of the head.
신호를 수신하여, 머리 주변부의 영상의 해상도와 신호 대 잡음 비를 높임으로써, 대뇌 피질 강조 영상을 획득By receiving the signal and increasing the resolution and signal-to-noise ratio of the image around the head, the cortex-enhanced image is acquired
하여 대뇌 질병에 대한 진단을 용이하게 할 수 있다. 기존의 저해상도 영상을 통해서는 전두엽(frontal lobe),This can facilitate the diagnosis of cerebral diseases. Through conventional low-resolution images, the frontal lobe,
측두엽(temporal lobe), 두정엽(parietal lobe) 및 후두엽(occipital lobe) 등의 인체의 머리 주변부 즉, 대뇌Temporal lobe, parietal lobe, and occipital lobe of the human body, such as the periphery of the head, that is, the cerebrum
피질을 구성하는 중요한 부위의 질병을 확인할 수 없었으나, 본 발명의 실시예들에 따라 고해상도의 다채널 위Although it was not possible to confirm the disease of an important region constituting the cortex, according to embodiments of the present invention, high-resolution multi-channel
상 배열 수신 전용 코일 및 비균일 모드를 사용하는 송신 전용 코일을 사용함으로써, 대뇌 피질 강조 영상을 획By using a phase array receive-only coil and a transmit-only coil using a non-uniform mode, cortical-weighted images are obtained.
득하여, 뇌 질환 환자들에게 보다 양질의 의료 서비스를 제공할 수 있다.As a result, it is possible to provide better quality medical services to patients with brain diseases.
도 1은 본 발명의 일 실시예에 따른 RF 코일 어셈블리의 전체적인 구성을 도시한 사시도.
도 2는 본 발명의 일 실시예에 따른 RF 코일 어셈블리의 전체적인 구성을 도시한 평면도.1 is a perspective view showing the overall configuration of an RF coil assembly according to an embodiment of the present invention.
Figure 2 is a plan view showing the overall configuration of the RF coil assembly according to an embodiment of the present invention.
본 발명의 일 실시예에 따르면, 자기공명영상(MRI) 시스템에서 송수신 겸용 코일을 사용하지 않고, 비균일 모드According to an embodiment of the present invention, a non-uniform mode without using a transmission/reception coil in a magnetic resonance imaging (MRI) system
를 갖는 송신 코일과 다채널 수신 코일을 사용하여, SNR과 해상도가 높은 머리 주변부의 영상을 얻을 수 있다.By using a transmitting coil and a multi-channel receiving coil with
일 실시예에 따르면, 송신 코일은 수신 코일의 바깥 부분에 위치될 수 있다.According to an embodiment, the transmitting coil may be located outside the receiving coil.
<14> 일 실시예에 따르면, 송신 코일과 수신 코일 각각에 대하여 인수 요인(filling factor)을 최대화할 수 있다.<14> According to an embodiment, a filling factor may be maximized for each of the transmitting coil and the receiving coil.
인수 요인은 코일의 체적(volume)과 피사체(phantom)의 체적의 비율을 나타내며, 인수 요인이 증가할수록 코일The factor represents the ratio of the volume of the coil to the volume of the phantom. As the factor increases, the coil volume increases.
의 민감도(sensitivity)가 증가하고, 이에 따라 신호 대 잡음 비(SNR)가 증가하여 높은 강도의 신호를 획득할, which increases the signal-to-noise ratio (SNR) of the
수 있다. MRI 시스템에서 피사체의 양성자의 에너지를 기저 상태에서 여기 상태로 변환하기 위해 사용되는 송can A transmitter used to convert the energy of a subject's protons from a ground state to an excited state in an MRI system.
신 에너지보다 피사체에서 발생되는 RF 신호, 즉 수신 코일이 수신하는 RF 신호의 세기가 더욱 지배적이기 때문This is because the strength of the RF signal generated by the subject, that is, the RF signal received by the receiving coil, is more dominant than the new energy.
에, 수신 코일이 피사체에 얼마나 가깝게 위치되는지 여부에 따라 민감도(sensitivity)가 결정될 수 있다.In this case, sensitivity may be determined according to how close the receiving coil is to the subject.
<15> 일 실시예에 따르면, 수신 전용 코일은 인체의 대뇌 피질 영상을 획득하기 위한 코일로서, 각각의 수신 코일은<15> According to an embodiment, the receive-only coil is a coil for acquiring an image of the cerebral cortex of the human body, and each receiving coil is
인체 머리 주변으로 16개가 동일한 위상차를 가지고 배열될 수 있다. 수신 전용 코일은 송신 전용 코일에서 피16 can be arranged with the same phase difference around the human head. Receive-only coils are avoided from transmit-only coils.
사체에 에너지를 전달하여 양성자의 에너지 상태가 기저 상태에서 여기 상태로 전환된 후 여기 상태에서 기저By transferring energy to the cadaver, the energy state of the proton is switched from the ground state to the excited state, and then from the excited state to the ground state.
상태로 전환되면서 발생되는 RF 신호를 획득할 수 있다. 송신 전용 코일의 경우 인위적으로 균일 모드(uniformIt is possible to acquire an RF signal generated while switching to a state. In the case of a transmit-only coil, artificially uniform mode (uniform
mode)를 사용할 경우 머리 전체에 균일한 에너지를 인가할 수 있지만, 본 발명의 일 실시예에 따르면, 새장mode), uniform energy can be applied to the entire head, but according to an embodiment of the present invention, a cage
(birdcage) 형태의 송신 전용 코일이 비균일 모드, 즉 구배 모드(gradient mode)로 최적화시킨 후 머리 외곽 부After optimizing the (birdcage) type transmission-only coil to a non-uniform mode, that is, a gradient mode, the outer part of the head
분에서 더 큰 신호를 얻을 수 있도록 설계될 수 있다.It can be designed to get a larger signal in minutes.
<16> 일 실시예에 따르면, 새장 형태의 코일은 집중 소자 컴포넌트(lumped element component)로 제작된 전송 선로<16> According to an embodiment, the cage-shaped coil is a transmission line made of a lumped element component.
(transmission line) 이론에 기초한 것으로서, 다른 형태의 볼륨 안테나(volume antenna)에 비해 신호 대 잡음As based on the (transmission line) theory, signal-to-noise compared to other types of volume antennas
비(SNR)와 자기장의 균일성(B1 field homogeneity)이 우수하다.The ratio (SNR) and the uniformity of the magnetic field (B1 field homogeneity) are excellent.
1은 본 발명의 일 실시예에 따른 송신 전용 코일과 수신 전용 코일의 자기장의 세기를 나타내는 그래프1 is a graph showing the strength of magnetic fields of a transmission-only coil and a reception-only coil according to an embodiment of the present invention;
Claims (1)
RF 신호를 생성하고, 상기 생성된 신호를 반송파로 변조하여, 변조된 신호를 출력하는 스펙트로미터
(spectrometer),
상기 스펙트로미터에 연결되고, 상기 변조된 신호를 증폭하기 위한 라디오 주파수 증폭기,
상기 라디오 주파수 증폭기에 연결되고, 상기 증폭된 신호를 두 개의 라디오 신호로 분기하기 위한 90도 하이브
리드 커플러,
상기 90도 하이브리드 커플러에 연결되고, 상기 분기된 두 개의 라디오 신호로부터 노이즈를 제거하기 위한 두
개의 노이즈 제거 필터, 및
상기 두 개의 노이즈 제거 필터 각각에 연결되고 상기 송신 전용 코일에 연결되는 임피던스 정합 회로
를 더 포함하는 RF 코일 어셈블리.The method of claim 1,
A spectrometer that generates an RF signal, modulates the generated signal with a carrier wave, and outputs a modulated signal
(spectrometer),
a radio frequency amplifier coupled to the spectrometer for amplifying the modulated signal;
a 90 degree hive coupled to the radio frequency amplifier for branching the amplified signal into two radio signals
lead coupler,
The two radio signals are connected to the 90 degree hybrid coupler and are used to remove noise from the two diverged radio signals.
denoising filters, and
An impedance matching circuit connected to each of the two noise removal filters and connected to the transmit-only coil
RF coil assembly further comprising a.
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2021
- 2021-02-10 KR KR1020210018931A patent/KR20220115219A/en unknown
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