CAJ | 학술논문

X 射线机是工业 CT 中使用最广泛的 X 射线源，但因阳极效应以及自身结构的限制，其射线强度空间分布不均匀，系统的研究和测量其射线强度分布对于实际应用十分必要。利用 CsI(Tl)光电二极管探测器测量了射线强度在不同轴线上随角度的分布，给出了理论分析，并与蒙特卡罗法计算结果做了对比，提出了“展宽效应”，解释了边界射线强度分布展宽的现象。比较了大、小焦点射线强度分布的情况，给出了其在阴极末端出现差异的原因。结合其在竖直方向的射线强度分布以及对称性，给出了 X 射线强度的二维分布。结果表明，在张角20°(–10°–+10°)的范围内，射线强度分布均匀（最大相对偏差4.59%），张角越大均匀性越差，在阴极端边界射线分布出现外延。
X 사선궤시공업 CT 중사용최엄범적 X 사선원，단인양겁효응이급자신결구적한제，기사선강도공간분포불균균，계통적연구화측량기사선강도분포대우실제응용십분필요。이용 CsI(Tl)광전이겁관탐측기측량료사선강도재불동축선상수각도적분포，급출료이론분석，병여몽특잡라법계산결과주료대비，제출료“전관효응”，해석료변계사선강도분포전관적현상。비교료대、소초점사선강도분포적정황，급출료기재음겁말단출현차이적원인。결합기재수직방향적사선강도분포이급대칭성，급출료 X 사선강도적이유분포。결과표명，재장각20°(–10°–+10°)적범위내，사선강도분포균균（최대상대편차4.59%），장각월대균균성월차，재음겁단변계사선분포출현외연。
Background: X-ray machine is the most-extensively-used X-ray source in industrial CT, due to its anode effect and the restrictions of its own structure, the radiation intensity distribution is not uniform. Purpose: The aim is to research and measure the radiation intensity distribution of X-ray machine as a vital part of imaging correction and the foundation for the precise application of X-ray machine. Methods: The CsI(Tl) scintillation and photodiode detector is used to measure the radiation intensity distribution of the MXR225/22 X-ray machine (made by Swiss COMET Inc.) along with various angles on different axis. At the same time, the radiation intensity distribution is simulated by Monte Carlo method. Results: The “broadening effect” is observed, and the boundary radiation intensity distribution broadening phenomena can be explained thereby. The radiation intensity distributions of the large and small focal are compared, and the reason for the difference in the cathode ends is analyzed. And the 2D radiation intensity distribution of X-ray machine is given. Conclusion: The results showed that in the 20° opening angle range (–10°–+10°), the radiation intensity distributes uniformly, the larger opening angle, the worse distribution uniformity. The radiation distribution extension occurs at the boundary of cathode side.