CAJ | 학술논문

目的：探讨多层螺旋CT（MSCT）诸扫描参数对图像质量的影响，以进一步提高MSCT图像的质量。方法固定扫描条件，分别对两种不同密度材料的质量控制体模进行扫描。在质量控制体模的左、中、右各选取1个431.43 mm2的感兴趣区（ROI），改变其中某个扫描条件（如层厚、电压、曝光量、螺距），对质量控制模各扫描10次，计算CT值（X±SD），并比较各条件下两种质量控制体模的CT值。结果在固定扫描条件下，随曝光量、层厚的增加，CT图像对应各材料的平均CT值变化不明显，而SD明显减小；随着管电压的升高，CT图像对应各材料的平均CT值和SD明显减小；随着螺距的增大，CT图像对应各材料的平均CT值无明显变化，而SD增加较为明显。结论CT图像质量与扫描参数密切相关，并且各扫描参数之间既相互影响，又相互制约。
목적：탐토다층라선CT（MSCT）제소묘삼수대도상질량적영향，이진일보제고MSCT도상적질량。방법고정소묘조건，분별대량충불동밀도재료적질량공제체모진행소묘。재질량공제체모적좌、중、우각선취1개431.43 mm2적감흥취구（ROI），개변기중모개소묘조건（여층후、전압、폭광량、라거），대질량공제모각소묘10차，계산CT치（X±SD），병비교각조건하량충질량공제체모적CT치。결과재고정소묘조건하，수폭광량、층후적증가，CT도상대응각재료적평균CT치변화불명현，이SD명현감소；수착관전압적승고，CT도상대응각재료적평균CT치화SD명현감소；수착라거적증대，CT도상대응각재료적평균CT치무명현변화，이SD증가교위명현。결론CT도상질량여소묘삼수밀절상관，병차각소묘삼수지간기상호영향，우상호제약。
Objective Scanning parameters of multi-slice CT(MSCT)on image quality are investigated to further improve the quality of the MSCT image. Methods On a ifxed scanning condition, the two quality control modules with different density materials, of which a region of interest (ROI:431.43 mm2) is selected respectively in the left, middle, right, are scanned. CT values (X±SD) of the two different modules are measured by 10 times scanning when only one condition is changed (such as layer thickness, voltage, exposure amount, pitch), then are compared. Results When only exposure amount and layer thickness increase, the mean CT value has no obvious change, but SD decreases obviously;as the tube voltage increases, the mean CT value and the SD signiifcantly decrease;with increasing of spiral pitch, the mean CT value gets no obvious change, but SD increases obviously. Conclusion Scanning parameters have close relationship with CT image quality, and parameters changes also would effect each other.