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박정병,문명국,이동명,구성모,조진호,김도성,우홍,도시홍,이상윤,강희동 경북대학교 센서기술연구소 1994 센서技術學術大會論文集 Vol.5 No.1
A digital X-ray image sensor system is described. A one-coordinate multiwire proportional counter plays the part of X-ray positioning sensor. This measures the distribution of X-ray intensity in horizontal direction with a 2mm channel. A two-dimensional image is produced by mechanical scanning with 2mm channel width in vertical direction. The number of pixels in the image is 32x32. The main characteristics of the sensor are: spatial resolution 1.4mm, counting rate capability 120kHz.
1차원 MWPC를 이용한 디지탈 사진촬영장치의 개발(Ⅲ)
강희동,조진호,박정병 경북대학교 센서기술연구소 1995 연차보고서 Vol.1995 No.-
Digital Radiography 장치로 응용하기 위한 1차원 MWPC를 이용하여 X-선 위치검출기를 설계 및 제작하였다. 위치검출 방법은 병렬판독법으로 얻으며 스캐닝장치를 이용해 X-선 영상을 얻는다. 제작한 검출기의 위치분해능은 0.8㎜이고, 동시성 선택회로를 고안하여 위치분해능을 0.4㎜로 향상시켰다. 실제 얻은 디지탈 값에서 각 채널에 대한 보정인자를 곱함으로써 영상의 균일성을 증가시켰다. 디지탈 X-선 영상은 0.4㎜의 scanning 간격으로 각종 피사체에 대하여 320×320 화소의 영상을 얻었다. X-ray position detector was designed and fabricated. The detector was applied to digital radiography system. One-dimensional MWPC(Multiwire Propotional Chamber) is the main component of this system. The way of detecting the position of incident x-ray is the parallel readout method. Digital image data are acquired by using fan beam x-ray and a scanning system. The spatial resolution of the detector is 0.8㎜. Spatial resolution was improved by a factor of two(0.4㎜) with help of the coincidence selection circuit. Uniformity was improved by converting data with calibration factor for each channel. With help of scanning system which has 0.4㎜ scanning pitch, x-ray digital images of 320×320 pixels were obtained for a fish and a chicken's foot. Bone image is appeared clearly in these images.
강희동,조진호,박정병 경북대학교 센서기술연구소 1994 연차보고서 Vol.1994 No.-
의료용 방사선센서인 X선 위치센서를 설계 및 제작하고, 이를 이용하여 DR(Digital Radiography) 시스템을 개발하였다. X선 위치센서는 1차원 MWPC(Multiwire Proportional Chamber)이고, 디지털 영상데이터는 fan beam형태의 X선과 스캐닝장치를 이용하여 얻어진다. 위치신호검출법은 신호검출속도가 빠른 장점을 가진 병열신호처리법으로 하였다. MWPC의 양극선 간격은 1㎜이고 검출기체는 P10 6기압이며 X선 관전압은 3KV로 하였으며, 이때 위치분해능(FWHM)은 0.8㎜이었다. 이러한 조건에서 64×128화소의 X선 디지털영상을 얻었다. The radiation sensor, X-ray position sensor, has been designed and made for a digital radiography system. X-ray position sensor is the type of an one dimensional MWPC(Multiwire Proportional Chamber). With the help of a scanning system, a digital image data can be taken. The position where X-ray absorbed is determined by the parallel readout method which has an advantage in data readout speed. Anode to anode distance was 1mm, gas pressure was P10 6.0atm and X-ray tube voltage was 36KV. At these condition, the spatial resolution(FWHM) was about 0.8mm. We had an X-ray digital image with 64×128 pixels
1차원 MWPC 를 이용한 디지탈 X-선 사진촬영장치의 개발
조진호,강희동,김도성,박정병,문명국,구성모 한국센서학회 1995 센서학회지 Vol.4 No.4
We have developed the digital radiography system applied by the one dimensional multiwire proportional chamber. X-ray position signals were obtained from anode wires which were connected to counters through amplifiers and discriminators. The chamber was made of gas flow type and detector gas was P10. The threshold voltage which gives to the discriminator is independent on the neighboring channels. This improved the uniformity of the detector. Then the differential nonlineality is ±4%. Increasing the gas pressure, the spatial resolution is about 1.4-mm at which the pitch of the anode wire is 2-mm. The object is scanned in vertical direction to take an image. The number of pixels in the image is 32 X 32.