CAJ | 학술논문

目的：探讨b值为150 s/mm2和800 s/mm2时DWI对肝左叶小病灶检出能力。方法：对35例肝脏左叶小病灶患者（共49个病灶，其中肝细胞癌13个，肝转移瘤16个，肝血管瘤11个，肝囊肿9个）分别行b=150 s/mm2和800 s/mm2的DWI，比较不同b值下DWI探测小病灶的能力。分别重建施加不同弥散梯度方向时对应的DWI，分析心脏运动对哪个弥散梯度方向的图像影响最重。结果：b=150 s/mm2发现全部49个小病灶，b=800 s/mm2仅发现17个，可见随着b值升高，DWI探测肝左叶小病灶的能力下降。对于肝左叶而言，心脏运动主要影响上下方向的弥散梯度图像，导致SNR下降，伪影增加。结论：b=150 s/mm2时DWI有助于减少心脏运动导致的肝左叶信号强度下降，提高小病灶检出率。
목적：탐토b치위150 s/mm2화800 s/mm2시DWI대간좌협소병조검출능력。방법：대35례간장좌협소병조환자（공49개병조，기중간세포암13개，간전이류16개，간혈관류11개，간낭종9개）분별행b=150 s/mm2화800 s/mm2적DWI，비교불동b치하DWI탐측소병조적능력。분별중건시가불동미산제도방향시대응적DWI，분석심장운동대나개미산제도방향적도상영향최중。결과：b=150 s/mm2발현전부49개소병조，b=800 s/mm2부발현17개，가견수착b치승고，DWI탐측간좌협소병조적능력하강。대우간좌협이언，심장운동주요영향상하방향적미산제도도상，도치SNR하강，위영증가。결론：b=150 s/mm2시DWI유조우감소심장운동도치적간좌협신호강도하강，제고소병조검출솔。
Objective:This study was aimed to investigate the DWI (b value was selected 150 and 800 s/mm2 respectively) de-tective ability of small lesions,which located in the left liver lobe. Methods:35 patients who had small lesions in the left lobe were imaged by DWI. The detective ability for small lesion was compared by different b-value DWI. And the different diffusion direction imaging of DWI were reconstructed,the most important influence of cardiac motion to DWI was analysed. Results:The all of 49 lesions were detected by DWI of b=150 s/mm2 in 35 patients,on the contrary,17 lesions by DWI of b=800 s/mm2. The higher b-value was used,the less lesions were detected. The cardiac motion mainly influenced the S/I diffusion direction,it led to artifacts and the reduction of the signal to noise ratio. Conclusion:The lower b-value DWI could be used to detect the small lesions in the left lobe.