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Objective To evaluate the applied values of susceptibility weighted imaging (SWI) in acute ischemic stroke.Methods Totally 40 patients with acute ischemic stroke were included within 72 hours after symptom onset.They adopted multimodal magnetic resonance imaging examination,including regular magnetic resonance imaging sequence (T1WI,T2WI),time of flight MR angiography (TOF-MRA),diffusion weighted imaging (DWI) and susceptibility weighted imaging (SWI).Furthermore,12 of the 40 patients received dynamic susceptibility contrast enhanced perfusion weighted imaging (DSCPWI) examination.Results Of the 40 patients,12 ones had positive results for multiple lesions of cerebral microbleeds (CMBs) by SWI,and the detection rate was 30％.There were 24 patients showed susceptibility vessel sign (SVS) in SWI,and the susceptibility rate was 60％.In the 12 patients received DSC-PWI examination simultaneously,there were 7 cases had the anomaly range by SWI larger than that by DWI while similar to that by DSC-PWI.Conclusion SWI can show SVS and CMBs clearly,estimate ischemic penumbra,know intracranial conditions completely and supply reliable basis for individualized treatment.
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Objective To explore the diagnostic value of 18F-FDG PET/CT in biliary obstruction.Methods Totally,28 biliary obstruction patients were divided into benign obstruction group (n =11) and malignant obstruction group (n =17)according to the cause of obstruction.Imaging characteristics of 18F-FDG PET/CT and maximal standard uptake value (SUVmax) were compared between the two groups.Efficacy of PET/CT and MRI in the diagnosis of obstructive jaundice were compared.Results In 28 cases,no or mild dilatation of biliary tract accounted for 53.57％ (15/28),moderate to severe dilatation of biliary tract accounted for 46.42％ (13/28).Among the malignant obstruction group,2 cases of hilar cholangiocarcinoma,5 cases of bile duct carcinoma,6 cases of carcinoma of the head of pancreas,and 4 cases of ampullary carcinoma were included,18F-FDG PET/CT showed proximal high metabolic nodules of the obstruction site in 14 cases.Among the benign obstruction group,7 cases were bile duct inflammatory stricture,of which 4 cases with bile duct stones.18F-FDG PET/CT showed a slight increase with patchy or nodular mild metabolism in 6 cases.There were 4 cases of autoimmune pancreatitis.The imaging 18 F-FDG PET/CT demonstrated multi-segmental or multiple nodular enlargement of the pancreas,with generally increased metabolism.SUVmax of malignant obstruction group (6.88± 2.81) was significantly higher than that of benign obstruction group (4.20± 1.70;t=3.143,P＜0.05).The sensitivity,specificity and accuracy of 18F-FDG PET/CT and MRI in the diagnosis of malignant obstructive jaundice were 94.12％ (16/17) and 58.82％ (10/17;x2=4.086 5,P=0.043),81.82％ (9/11) and 63.64％ (7/11;x2=0.229 2,P=0.632),89.29％ (25/28) and 60.71％ (17/28;x2 =4.666 7,P=0.031),respectively.Conclusion 18F-FDG PET / CT has a great value in the diagnosis of obstructive jaundice,which is of great significance for clinical decision-making.
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Objective To observe the MRI characteristics in subacute combined degeneration (SCD)of the spinal cord.Methods The data of 1 9 SCD patients were retrospectively analyzed by the clinical characteristics and MR images.Results Among the 1 9 pa-tients of SCD,1 6 cases showed abnormal findings.Most of intramedullary lesions located in posterior column of thoracic and cervical spinal cord,and only one case located in cerebellar cortex and medulla oblongata.Lesions were involved in muti-segmental spinal cord,and mainly located in the dorsal or lateral spinal cord,and only two cases located in the anterior spinal cord.Different segmental spinal cord lesions had a different morphological characteristics with no enhancement.After treatments with vitamin B1 2 ,the lesions diminished and even disappeared in 2 cases.Conclusion MRI has important value in the diagnosis and treatment monitor of the SCD.
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PurposeAdult intussusception is rare, and clinical symptoms are atypical and tend to be misdiagnosed. This study aims to explore the imaging features of intussusception on multi-slice CT (MSCT) and to improve the diagnosis of this disease. Materials and Methods Sixty cases with intussusception conifrmed by pathology were recruited and imaging ifndings including sleeve head lesions, set sheath canal, exhumation of intestine, involved mesenteric fat, and blood vessels were retrospectively analyzed. Results The direct sings included 60 cases with target signs, 44 of them with single target signs and 16 of them with double target signs; the shape was kidney like in 39 cases and irregular in 21 cases; 22 cases showed double intestinal signs, 15 cases showed comet tail signs, and 25 cases showed mountain like with different direction. The indirect signs included 60 cases with thickened intestinal wall and 45 cases with mesenterium fat and vessel in enteric cavity, 12 cases with adjacent mesenteric mass and enlarged retroperitoneal lymph nodes, 15 cases with ascites, 7 cases with metastatic tumors, including 4 cases of liver metastasis, 2 of pelvic ossiifcation metastasis, and 1 of multiple organ metastasis, 1 case combined with renal calculus and 3 case with ureteral caluli. Conclusion There are some special CT manifestations of adult intussusception. Mountain like sign with different direction at the tail is one of the characteristics. CT plays an important role in clinical procedure.
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BACKGROUND:Continuous monitoring is required in the survival, distribution, migration, proliferation and differentiation of transplanted stem cel s in vivo thereby to assess its efficacy and safety. OBJECTIVE:To analyze the characteristics of literature addressing stem cel markers and MRI tracer in the past 10 years. METHODS:The first author retrieved CNKI and Web of Science by computer for articles about MRI tracing of stem cel s published from January 2005 to December 2014, using the keywords of“stem cel s, magnetic resonance imaging, tracing technique”that appeared in the title and abstract. Then, the retrieved articles were further analyzed. RESULTS AND CONCLUSION:Currently, tracing technique has been widely used in stem cel therapy, organ transplantation, bacterial infection, gene expression and new drug development. Stem cel tracing technologies include isotope tracing, antigenic labeling, fluorescence protein labeling, fluorescent dye labeling, nuclear magnetic resonance contrast enhancer labeling, Lac-Z gene labeling, Y chromosome labeling. Recently, with the development of molecular imaging, MRI tracing techniques have been increasingly used to assess the efficacy and safety of stem cel transplantation.
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Objective To explore the effect of modified type B lynch uterine suture combined with calcium in the prevention and treatment for uterine atony postpartum hemorrhage.Methods 63 pregnant women with postpartum hemorrhage risk factors which would be underwent cesarean delivery were randomly divided into the study group (32 cases) and the control group (31 cases).The study group was given intravenous calcium gluconate (10ml) 10 min before the operation,and modified type B lynch uterine suture in the operation.The control group was only given the same dose of oxytocin of the study group.Results The amount of bleeding intraoperation and 24h after the operation was (182.6 ± 47.7) ml and (214.1 ± 63.8) ml,respectively,the time of intraoperative uterine contractions was (3.8 ± 1.3)min,the degree of hemoglobin decreased 24h after the operation was (9.2 ±2.0) min in the study group,which were less than those of the control group(t =7.26,2.97,2.39,4.01,all P ＜ 0.05).There was no statistically significant difference in puerperal morbidity and neonatal asphyxia between the two groups (all P ＞ 0.05).Conclusion The modified type B lynch uterine suture combined with calcium could effectively prevent and treat uterine atony postpartum hemorrhage,and could not increase the rate of neonatal asphyxia and puerperal morbidity.
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ObjectiveTo assess the value of plain X-ray radiography,CT and MRI in the diagnosis of synovial oateochondromatosis.MethodsTwenty patients with synovial osteochondromatosis confirmed with surgery and pathology were enrolled.The images of X-rays (n= 18),CT (n=20) and MRI (n= 10) were analyzed retrospectively.ResultsDefinite diagnosis was made in 15 patients according to plain X-ray radiography,in 18 patients according to CT findings,while in 8 patients according to MRI manifestations.Plain X-ray radiography,CT and MRI could show loose bodies around/within the involved joints in various shape,size and different amount.Plain X-ray radiography and CT could show calcification of loose bodies.MRI could show early cartilage loose bodies.CT and MRI could display effusion of the involved joints.ConclusionPlain X-ray radiography,CT and MRI are able to diagnose synovial osteochondromatosis.CT and MRI can depict lesions and characteristics that impossible for X-ray radiography.
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Objective To obtain the normal reference value through researching ?HU of CT scanning symetric cerebral structrue among healthy group and to study its value in CT diagnosing super acute cerebral infarction.Methods 33 volunteers with normal neuro system were undertaken routine plain CT scanning to measure the symetric cerebral structrue on 7 pairs of tissues of each person and caculated 231 ?HUs. All the data were analyzed statistically to get a normal reference value, which was compared with the ?HU of 30 super acute cerebral infarction cases (33 suspected symptoms)confirmed by follow-up.Results The mean?HU of CT scanning symetric cerebral structrue among healthy group was 0.39 with Q=0.48(?HU) a maximum of 1.79 (?HU) and minimum of 0.00 (?HU). Among the pathological change group, the mean ?HU of CT value was 3.62 with Q=2.44 (?HU), a maximum of 8.34(?HU) and minimum of 1.2 (?HU). There was significant difference between the ?HUs of 7 pairs of cerebral tissues of each person in normal group and those of the pathological change group(P