Abstract:
PURPOSE: A radiation image device capable of wirelessly transmitting data is provided to prevent a user from being exposed to radiation by controlling a signal processing part to implement a long distance transmission. CONSTITUTION: A detection part converts emitted radiation into a flashlight signal. The detection part converts the converted flashlight signal into an electric signal. A signal amplification part (120) amplifies the electric signal. A data transmission part (130) wirelessly transmits the electric signal to a signal processing part. The signal processing part (150) converts the electric signal into an image signal. [Reference numerals] (100) Signal acquisition part; (110) Extracting part; (120) Signal amplification part; (125) Data acquisition part; (130) Data transmission part; (150) Signal processing part; (160) Receiving part; (165) Signal transceiving part; (170) Displaying part
Abstract:
GAPD(Geiger mode Avalanche Photo Diode)를 광센서로 이용하는 PET 검출기 모듈을 개시한다. 상기 PET 검출기 모듈은 생체내에서 방출되어 입사된 감마선을 검출하여 섬광으로 변환시키는 섬광결정와 상기 섬광결정의 양측으로 각각 연결되어 상기 변환된 섬광을 전기적인 신호로 변환시키는 제1 GAPD(Geiger mode Avalanche Photo Diode) 광센서 및 제2 GAPD 광센서를 포함하는 PET(Positron Emission Tomagraphy) 검출기 단위, 및 상기 PET 검출기 단위로부터의 신호를 수신하여 획득된 상기 제1 GAPD 광센서 및 제2 GAPD 광센서에서 검출되는 각각의 신호의 진폭의 크기를 비교함으로써 상기 섬광결정에서 상기 감마선이 입사된 위치(이하 반응깊이라 함)를 판별하는 반응깊이 판별부를 포함한다. 본 실시예에 따른 PET 검출기 모듈은 선형성이 유지되면서 고에너지 및 반응깊이 정보까지 제공할 수 있다.
Abstract:
PURPOSE: A method for removing a noise of a PET(Position Emission Tomography) signal in a PET-MRI fusion device using a filtering and a PET system in the PET-MRI fusion device using the same are provided to minimize image distortion by obtaining a molecular image without the performance deterioration of a PET detector. CONSTITUTION: A PET output signal is received and a signal is amplified(S510). The amplified PET output signal is converted into a digital signal(S520). An RF noise is digitally filtered by using correlation between the frequency of the PET output signal and an MR RF frequency(S530). A signal is processed for imaging(S540).
Abstract:
본발명은 PET 장치및 PET 장치의신호처리방법에관한것으로서, 본발명에따른 PET 장치는검출된감마선신호를입력받아출력파형의상승시간이 100ns보다작도록증폭하는전치증폭부; 전치증폭부에서증폭된신호를디지털신호로변환하는 ADC; 및디지털신호를입력받아, 입력된디지털신호중에서광전효과가발생하는에너지값을가진신호를저장하는신호처리부를포함함으로써, 불응시간을감소시키고, 계수율을증가시켜 PET 장치의민감도가향상된 PET 장치를제공할수 있다.
Abstract:
PET-MRI 융합장치의 영상 품질을 저하시키는 MRI RF 차폐물 없이 PET-MRI 융합장치에서의 PET 신호의 잡음제거방법을 개시한다. 상기 방법은 (a1) PET(Positron Emission Tomography :PET) 아날로그 신호를 일정 샘플링 주파수를 가진 디지털 신호로 변환하는 단계, (b1) 상기 PET 디지털 신호의 샘플링 포인트 또는 상기 PET 디지털 신호의 적분값을 이용한 모델링을 통하여 영상구성에 포함될 PET 디지털 신호인지를 판단하는 단계, 및 (c1) 상기 영상구성에 포함될 PET 디지털 신호만을 추출하는 단계를 포함한다. PET 검출기의 성능저하없이 분자영상을 획득할 수 있다.
Abstract:
PURPOSE: A method for detecting the arrival time of a gamma ray pulse signal in a pet detector is provided to detect the arrival time of a gamma ray pulse signal using a cross point, thereby increasing temporal resolution. CONSTITUTION: An analog-digital converter detects the initial rising line of a voltage value of a digital signal about a gamma ray pulse signal(S610). The analog-digital converter detects a reference line by statistically processing a digital signal(S620). The analog-digital converter calculates the cross point between the initial rising line and the reference line(S630). The analog-digital converter detects the arrival time of the analog-digital converter by using the cross point(S640). The analog-digital converter amplifies a digital signal of the gamma ray pulse signal.
Abstract:
The present invention relates to a method of controlling sensor gain of a positron emission tomography (PET). More specifically, the present invention relates to a method of controlling sensor gain of a positron emission tomography which includes converting radiation detected by a signal conversion unit into an electrical signal; amplifying the converted electrical signal by a pre-amplifying unit; sampling the electrical signal by a digital conversion unit and converting the electrical signal into a digital signal; extracting at least one data from the digital signal by a data obtaining unit and processing signals of the extracted data; and imaging the signal-processed data by an image obtaining unit to obtain a PET image, wherein the amplifying the electrical signal by the pre-amplifying unit further includes a process in which a resistance value is adjusted to control a gain value of the electrical signal. The method of controlling sensor gain of a positron emission tomography may further include supplying constant voltage to the detector by a power supply unit to constantly maintain the performance of the positron emission tomography. The method of controlling sensor gain of a positron emission tomography is able to obtain constant performance and gain value without being affected even if the temperature of the positron emission tomography is changed.
Abstract:
PURPOSE: A method for removing a noise of a PET signal in a PET-MRI fusion device using modeling and a PET system in the PET-MIR fusion device using the same are provided to minimize the deterioration of sensitivity by removing disturbance elements. CONSTITUTION: A PET(Position Emission Tomography) analog signal is converted into a digital signal with a constant sampling frequency(S110). A PET digital signal is grasped through modeling using a sampling point of the PET digital signal(S120). The PET digital signal is extracted to be included in an image composition(S130). The image is composed of the extracted digital signal(S140).
Abstract:
PURPOSE: A PET device and a signal process method of the PET device are provided to improve the sensitivity of a PET device by increasing a counting rate. CONSTITUTION: A PET device comprises a pre-amplification unit(220), an ADC(Analog to Digital Converter, 230) and a signal processing unit(240). The pre-amplification unit receives a detected gamma-ray signal and amplifies the rise time of the output waveform under 100ns. The ADC changes the signal, amplified by pre-amplification unit, into digital signal. The signal processing unit receives the digital signal and stores the signal having the energy value, in which the photoelectric effect generates.