CAJ | 학술논문

目的：研究通过比较宝石能谱成像(GSI)质量控制(QC)图像及单能图像与常规CT成像质量物理参数的异同，探究GSI质量控制图像及单能图像是否具有常规CT成像的诊断价值。方法：使用GE公司生产的Discovery CT750 HD机型的GSI模式和常规成像模式进行扫描，获得QC图像、单能图像和常规图像。采用美国体模实验室生产的Catphan 500 CT质控体模测量物理成像参数，评价图像质量。结果：GSI模式提供QC图像的CT值准确性、噪声参数和高对比分辨率与常规CT图像接近，但对比度噪声比(CNR)仍存在较大差异。单能图像在70～80 keV条件下所获得CT值准确性和图像分辨率与常规CT成像接近，随着能量(keV)增加图像参数与常规CT图像相差较大。结论：在采用GSI模式下的QC图像代替常规CT进行诊断时应考虑到低对比度的差异。
목적：연구통과비교보석능보성상(GSI)질량공제(QC)도상급단능도상여상규CT성상질량물리삼수적이동，탐구GSI질량공제도상급단능도상시부구유상규CT성상적진단개치。방법：사용GE공사생산적Discovery CT750 HD궤형적GSI모식화상규성상모식진행소묘，획득QC도상、단능도상화상규도상。채용미국체모실험실생산적Catphan 500 CT질공체모측량물리성상삼수，평개도상질량。결과：GSI모식제공QC도상적CT치준학성、조성삼수화고대비분변솔여상규CT도상접근，단대비도조성비(CNR)잉존재교대차이。단능도상재70～80 keV조건하소획득CT치준학성화도상분변솔여상규CT성상접근，수착능량(keV)증가도상삼수여상규CT도상상차교대。결론：재채용GSI모식하적QC도상대체상규CT진행진단시응고필도저대비도적차이。
Objective:GSI technique has showed great advantages in clinical usage, but research on imaging quality of this technique was just started. The purpose of this study was to compare physical metrics of different image mode and to evaluate whether QC image of GSI and single keV image had the clinical value of normal CT image. Methods:Catphan 500 CT QC phantom was examined on Discovery CT750 HD (GE Healthcare, Waukesha, USA);QC images and CT monochromatic images were acquired by GSI mode and compared to routine images. Results:CT value, image nose and detail resolution of GSI QC image were close to that of normal CT image, but with difference of CNR. CT value and image resolution of single energy image between 70-80 keV were close to that of normal image. With the increase of keV differences became more significant. Conclusion:The difference of low contrast of image should be considered when using QC image of GSI to simulate normal CT image.