CAJ | 학술논문

采用Catphan 503模体，选用不同的扫描预设条件成像，对加速器机载千伏级锥形束CT( kV-CBCT)图像的均匀性、噪声、低对比度分辨率和空间分辨率进行评估。结果表明提高X线球管管电压管电流、增大机架旋转扫描范围、减小准直器尺寸、提高重建精度等参数有利于获得高质量锥形束CT( CBCT)图像，但同时患者将多受额外的X射线辐射，也加大X线球管和探测器等元器件的损耗。因此，临床使用中应根据患者解剖条件合理选择成像参数，这样既能保证图像质量，又尽可能降低患者的辐射剂量。
채용Catphan 503모체，선용불동적소묘예설조건성상，대가속기궤재천복급추형속CT( kV-CBCT)도상적균균성、조성、저대비도분변솔화공간분변솔진행평고。결과표명제고X선구관관전압관전류、증대궤가선전소묘범위、감소준직기척촌、제고중건정도등삼수유리우획득고질량추형속CT( CBCT)도상，단동시환자장다수액외적X사선복사，야가대X선구관화탐측기등원기건적손모。인차，림상사용중응근거환자해부조건합리선택성상삼수，저양기능보증도상질량，우진가능강저환자적복사제량。
This study scanned the Catphan 503 phantoms to evaluate the uniformity, noise, low contrast resolution and spatial resolution of Linac-integrated kV-cone beam CT image with choosing different scanning preset parame-ters, and analyzed the image variations changed with the tube voltage, tube current, collimator type, gantry scan-ning range and reconstruction precision. The results showed that improving X-ray tube voltage and current, expen-ding the scanning gantry rotation range and reducing collimator size, increasing reconstruction precision and other imaging parameters were conducive to high quality cone beam CT images. As a result, patients suffered more addi-tional X-ray radiation and X-ray tube and detector components loss increased, simultaneously. Imaging scanning preset parameters should be reasonably chosen according to the patient's anatomy,which can guarantee the image quality and minimize patient radiation dose.