發(fā)布時間：2019-01-29 19:18

【摘要】：采用X射線源陣列的靜態(tài)CT成像系統(tǒng)為消除機械運動偽影,提高重建圖像質(zhì)量以及掃描成像效率提供了有效途徑。高效、準(zhǔn)確的幾何標(biāo)定方法是對X射線源陣列標(biāo)定的關(guān)鍵。提出通過對一個已知三維標(biāo)定模板的一次投影成像,采用最小二乘的直接線性變換法實現(xiàn)X射線成像系統(tǒng)的內(nèi)、外參數(shù)準(zhǔn)確估計的方法,以此方法用于靜態(tài)CT掃描成像系統(tǒng)的幾何標(biāo)定。實驗和仿真結(jié)果表明,該標(biāo)定方法無需輔助裝置,避免了滿足要求條件的多次投影成像的過程;不受標(biāo)定模板空間姿態(tài)的限制,一個X射線源與探測器的幾何標(biāo)定只需一次投影成像過程,方法簡單、準(zhǔn)確、易于操作,適于平面探測器的靜態(tài)錐束X射線源陣列的成像系統(tǒng)幾何參數(shù)的準(zhǔn)確標(biāo)定。
[Abstract]:The static CT imaging system using X-ray source array provides an effective way to eliminate the artifact of mechanical motion, improve the quality of reconstructed image and improve the efficiency of scanning imaging. Efficient and accurate geometric calibration method is the key to the calibration of X-ray source array. This paper presents a method of accurate estimation of the inner and outer parameters of X-ray imaging system by using the least square direct linear transformation method through the primary projection imaging of a known 3D calibration template. This method is used for geometric calibration of static CT scanning imaging system. The experimental and simulation results show that the calibration method does not need auxiliary devices and avoids the process of multiple projection imaging which meets the requirements. The geometric calibration of an X-ray source and detector requires only one projection imaging process, which is simple, accurate and easy to operate. Accurate calibration of geometric parameters of imaging system for static cone-beam X-ray source array suitable for planar detectors.
【作者單位】： 西安理工大學(xué)機械與精密儀器工程學(xué)院;弗吉尼亞理工大學(xué)生物醫(yī)學(xué)工程與機械學(xué)院;
【基金】：國家自然科學(xué)基金(51305346,51405382)項目資助
【分類號】：TH774

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