1The effects of different PLD time on 3D ASL cerebral blood flow in the patients with acute cerebral infarctionZHANG Qiuhuan, WANG Weixin, ZHANG Ting, LIU Yan, LI jie, LIU Ming, WANG ZhiqunArticles173-1772Leigh syndrome in children: brain MR imaging characters and diagnosisTANG Xiaolu, LYU Yanqiu, TAO Xiaojuan, LIU Yue, FANG Fang, SHEN Danmin, CHENG HuaArticles178-1833Osteoid osteoma of the metatarsal bone: one case reportReports183,19341H-MRS study on hippocampus in the patients with postpartum depressionHUANG Xiaoyan, GU Xiaoli, SHEN Xiaoyong, SHAO YongliangArticles184-1865Value of three dimensional arterial spin labeling imaging in differential diagnosis of non-enhanced cerebellar gliomas and cerebellar infarctionWANG Jia, LIU Na, WANG Lizhang, ZHANG Weiqiang, YU FangrongArticles187-1896Value of MRI in the diagnosis of primary intracranial lymphomaZHENG Menglong, XIE DaohaiArticles190-1937Application of the technique of low trigger threshold combined with multiphase injection of contrast-saline mixture with dual-flow technique for low dosage of contrast agent in cranio-cervical CTA for large weighted casesZHU Zhenhua, SHI Hao, LI Haiwen, ZHAO Xinhai, LV Yingqiang, WANG Lizong, MENG Xianghong, TANG WenArticles194-1978Analysisi of MRI findings of acute disseminated encephalomyelitis in adultZHOU Yong, YIN JieArticles198-2019Extraskeletal osteosarcoma: one case reportReports201,21310Clinical value of swallowing angiography in patients with dysphagia and brain injuryZHOU Rendi, SHANG Xiaodong, QIAN Qian, YU Qin, SHEN XiumingArticles202-20511The value of MSCT diagnosis of multiple nodules lesion of parotid glandPAN Weiling, WANG Xueting, YIN Dongxue, DONG ZhichengArticles206-20912Clinical application of ultrasound-guided fine needle aspiration biopsy in the diagnosis of suspected malignant thyroid nodulesDENG Lili, WANG Yining, FAN Hua, HU Lijia, YANG Ji, ZHANG Min, TANG RongArticles210-21313The value of fine-needle aspiration and core-needle biopsy in the diagnosis of thyroid neoplasmYUAN Shasha, CHENG Wen, HAN Xue, NA Ziyue, LIU ZhaoArticles214-21714Study on the invasiveness of Papillary thyroid carcinoma by ultrasonography combined with serologic examinationYU Fuying, WANG Chunguang, XIN Wang, YUE Yujie, ZHOU Jinjin, SUN Wenkui, WANG YulingArticles218-22115Prenatal ultrasound diagnosis of ichthrosis fetalis: one case reportReports221,22516The value of ultrasonography in detecting NT thickening and venous catheter spectrum abnormality in the screening of fetal complex cardiac malformationsYE Chunxiu, ZHENG Na, LI Haiping, QI Yuxia, YU TingqinArticles222-22517Application value of four-dimensional space-time correlation imaging in fetal heart screeningWANG Xiaoyu, ZHENG Xuedong, WANG Jianwei, MA GuifengArticles226-22818Study on the related factors of mitral stenosis complicated with atrial fibrillation in rheumatic heart diseaseCHEN Meihua, ZHOU Dexing, CHEN Zelun, YAN Chunmiao, ZHANG Qiuyuan, HUANG Xuning, WANG LehuaArticles229-23219Study on the value of integrated echocardiography in Ozaki operation in children with aortic valve malformationZHANG Zhifang, TIAN Jiahe, ZHANG Yuqi, ZHANG Haibo, LIU Yiqing, HU RenjieArticles233-23720Observation of the curative effect of 125I seed implantation for the treatment of recurrent non-small cell lung cancer after radiation and chemotherapyLONG Wenxing, ZHOU Dingzhong, ZOU Tun, LI QingArticles238-240 