ObjectiveTo evaluate the value of uhrasonography for arthrocentesis in the hip and the advance of the femoral head/acetabulum as the puncture location in patients without sonographically obvious joint effusion.Methods Forty-three patients diagnosed with ankylosing spondylitis or osteoarthritis were included,82 hip joints were involved and received ultrasounded-guided intra-articular injections.The puncture site was the joint space between the femoral head and the acetabulum.The times,depth,procedure time,side effects and complications of each injection were recorded.ResultsAll 82 hips could be explicitly displayed.The depths from the skin surface to the joint space were (3.4 ± 0.9)cm (left)and (3.1 ± 0.8)cm (right),respectively.Overall,100％ of hip joints were punctured successfully,and 95.1％ of them were succeeded with the first arthrocentesis.The procedure time was (287.9 ± 45.8) s.No side effects or complications were observed.ConclusionsThe sonographic technique could be used as a primary method of image guidance for performing hip arthrocentesis and the joint space between the femoral head and the acetabulum could be a choice of target location for the patients without joint effusion.

Objective To investigate the expression of peroxisome proliferator-activated rec eptor γ (PPARγ) and glucokinase (GK) induced by Wnt signaling pathway in mice NIT-1 β-cells,and to explore the interaction between PPARγ and Wnt signaling pathways.Methods Recombinant Wnt3a protein was applied to NIT-1 beta-cells to activate Wnt signaling pathway.The expression of PPARγ was determined by real-time PCR and Western blotting.The expression of GK was determined by real time PCR.Results Wnt3a rapidly activated Wnt/β-catenin/TCF signaling pathway,and increased PPARγ and GK mRNA expression by 41.2％ and 65.0％ in NIT-1cells,with PPARγ protein expression increasing by 97.8％ (P＜0.01).These effects were abrogated by Wnt and PIK3 inhibitors,dickkopf 1 and wortmannin treatment (P＜ 0.01).Conclusions PPARγ and GK can be upregulated by Wnt singnaling,and the effects might partially be PI3K-dependent.

Objective To prepare targeted nanoscale lipid ultrasound contrast agent and study the targeting function in vitro.Methods After the biotinylated monoclonal antibody Herceptin was prepared,the biotinylated degree and immunological activity were determined.Then biotinylated antibody was attached to the surface of nanoscale lipid ultrasound contrast agents by avidin-biotin system to prepare the targeted nanobubbles.The targeting function was studied by observing the combination ability of the targeted nanobubbles with SKOV3 cells in vitro,non-targeted nanobubbles as controls,and observing ultrasound imaging in vitro.Results About 16 biotin molecules were coupled to each antibody in average,and the immunological activity of the biotinylated antibody didn't decrease compared with the free one(P ＞0.05).SKOV3 cells were combined firmly and surrounded regularly by red dyed targeted nanobubbles,while control groups were negative.Ultrasound imaging could be significantly enhanced by targeted nanobubble binding to SKOV3 cell slides,the other two control groups were negative.Conclusions Nanoscale ultrasound contrast agent and antibodys can be combined firmly by avidin-biotin system to produce the targeted nanobubbles,which have strong targeting function in vitro and significantly enhanced ultrasound signal.

Objective To explore the clinical application and diagnostic efficiency of two-dimensional shear wave elastography (2D-SWE) in assessing liver fibrosis of patients with viral and non-viral hepatitis. Methood Seventy-three patients with viral hepatitis and sixty with non-viral hepatitis scheduled for liver biopsy in the third Affiliated Hospital, Sun Yat-Sen University from April, 2011 to January, 2013 were enrolled in this study. The Young's modulus in different fibrosis stages, correlation coefficients of liver fibrosis level and area under receiver operating characteristic curve (ROC) were compared between patients with viral and non-viral hepatitis respectively. Results The hepatic Young's modulus of patients with viral and non-viral hepatitis in S0-1, S2-3, S4 were 6.1(4.8-6.6)kPa,7.4(6.0-8.4)kPa,10.3(7.6-14.0)kPa, and 10.7(8.0-13.5)kPa,24.7(17.4-32.1)kPa,26.8(16.5-31.7)kPa, respectively. The difference of Young's modulus between viral and non-viral hepatitis in S0-1 were statistically significant (Z=-3.45, P=0.001), while not in S2-3 and S=4 (Z=-0.40, -0.06, P=0.686, 0.956). Correlation coefficients of liver fibrosis with 2D-SWE in viral and non-viral hepatitis are 0.964,0.817 ( both P=0.000 ) with statistically significant difference (Z=2.42, P=0.015). The area under ROC for S≥2 and S=4 in viral and non-viral hepatitis were 0.964 and 0.930,0.817 and 0.906 respectively. The comparison was significantly different for S≥2 (Z=-2.47, P=0.014), while not for S=4 (Z=-0.502, P=0.616). Conclusion In liver fibrosis assessment, the diagnosis efficiency of 2D-SWE in patients with viral and non-viral hepatitis was different and dependent on fibrosis stage.

Objective To evaluate the value of contrast-enhanced ultrasound (CEUS) in diagnosing ischemic-type biliary lesion (ITBL) and analyze the relation between the enhancement patterns of bile duct wall of ITBL and its outcome.Methods 36 patients confirmed with ITBL (24 cases),anastomotic biliary stricture (3 cases),cholangitis (4 cases),biliarysludge (1 cases),and acute rejection (4 cases),who underwent CEUS examination,were enrolled in this study.The images were retrospectively analyzed in consensus by 2 readers.After reviewing the images,the readers were asked to make a diagnosis of ITBL.The diagnostic standard was hypo-or non-enhancement of hilar bile duct wall in arterial phase on CEUS.Results The diagnostic sensitivity,specificity,accuracy,positive predictive value and negative predictive value were 66.7％,83.3％,72.2％,88.9％,and 55.6％ for reader 1;62.5％,83.3％,69.4％,88.2％,and 52.6 ％ for reader 2,respectively.The interobserver agreement was good (κ =0.83).In 24 ITBL patients,the ratio of mortality or retransplantation with non enhancing hilar bile duct wall in arterial phase was much higher than that with enhancing hilar bile duct wall (non-enhancement 54.5％,hypo-enhancement 20％,hyper-or iso-enhancement 12.5％).Conclusions CEUS had diagnostic value of ITBL.Non-enhancing hilar bile duct wall in arterial phase on CEUS predicated the poor outcome.

ObjectiveTo determine the feasibility of using left ventricular volume-time curve in the evaluation of left ventricular diastolic function,and to analyze characteristics of left ventricular volume-time curve changcs in hypertrophic cardiomyopathy (HCM).MethodsSeventeen cases of HCM and 12 healthy volunteers received cardiac MRI (CMRI) examination,and left ventricular (LV) 2-chamber long and short axis cine imaging were performed,LV volume-time curves were reconstructed and platform time,different diastolic volume recovery (DVR) time and their corresponding filling velocity were calculated from LV volume-time curve off-line.The DVR time and their corresponding filling velocity were analyzed by using multiple linear regression analysis. Results Compared with the group of healthy volunteers,ventricular septal HCM group had delayed left ventricular 50％,70％ DVR time[ (8.9 ± 1.3) versus (7.7 ± 0.8 ) phase,F=6.787,P=0.016;(11.3 ±1.6) versus(9.7±1.8) phase,F=4.927,P=0.036] and shortened plateau time [ ( 1.8 ± 1.7) versus ( 4.1 ± 1.4 ) phase,t =6.787,P ＜ 0.01 ].Ventricular septal HCM group had reduced 30％,50％ DVR filling rates [ (0.22 ± 0.11 ) versus (0.40 ± 0.15 ) ml/ms,F =12.916,P ＜ 0.01 ; (0.20 ± 0.09 ) versus (0.30 ± 0.10) ml/ms,F =7.121,P =0.014 ] compared with those in the group of healthy volunteers.But 70％,80％,90％ DVR filling rates showed no statistically significant different in the two groups.In HCM patients,myocardial fibrosis caused 50％,70％,80％ DVR time delay [ (9.6 ± 1.0) versus ( 7.9 ± 1.5 ) phase,F =5.000,P =0.045 ; ( 12.3 ± 1.4 ) versus ( 9.6 ± 1.8)phase,F=8.039,P=0.015;(13.1 ±1.4 ) versus(10.9±1.9)phase,F=5.060,P=0.044],but no significant difference of DVR filling rate was found between the two groups. Conclusions Left ventricular volume curve analysis techniques can be used for detailed evaluation of left ventricular diastolic function.The left ventricular diastolic dysfunction of hypertrophic cardiomyopathy occurs mainly in early diastolic period,and accompanied by the shortening of the plateau time. Myocardial fibrosis can aggravate early left ventricular diastolic dysfunction of hypertrophic cardiomyopathy.

Objective To tested the passive targeting of nanobubbles penetrating tumor vascular endothelial cells gap.Methods Twenty female BALB/c nude mice subcutaneously bearing human ovary cancer SKOV3 were devided into two groups:group A (ultrasound imaging) and group B (frozen sections:B1 and B2).DiI labled nanobubbles and microbubbles were prepared and adjusted into the same concentrations.Group A:Microbubbles and nanobubbles of 35 μl were injected into the tail vein of every mouse respectively (1.5 h interval).Ultrasound imaging were acquired.Group B:Nanobubbles and microbubbles of 10 μl were injected into the tail vein of mice in Group B1 and Group B2 respectively.Heart perfusion by PBS or 0.9％ normal saline was carried out 1.5 h after bubbles injection to clear the free bubbles in blood circulation.And the tumor and muscle of right lower limb were immediately cut off for frozen slices (3 μm),which were stained by Hoechst 33342 to mark the nucleus.Images were obtained with a confocal microscope.Results In vivo ultrasound imaging,the time to peak and clearance time of nanobubbles were longer than those of microbubbles,whereas the intensity of enhancement was lower than microbubbles.Frozen sections showed:with the confocal laser scanning microscopy imaging,quite a number of DiI-labeled nanobubbles existed in the intercellular space of SKOV3 tumor,whereas there were few nanobubbles in skeletal muscle sections.In the control,rare DiI-labeled microbubbles were observed in tumors and skeletal muscle.Conclusions Self-made lipid nanobubbles were small enough to pass through the tumor vascular endothelial gap,namely achieve the tumor passive targeting.

Objective To prepare a new thrombus model by fluid model method , which is suitable for evaluation of mechanical thrombectomy devices for acute stroke.Methods The fluid model adopted the Chandler loop theory , while the static model adopted conventional method.Mechanical properties of thrombi prepared by fluid model and static model were measured by manual elongation test ( 15 samples in each group) and catheter injection test (15 samples in each group ).Histological structure was compared among the above thrombus models ( 5 samples in each group ) and specimens of five patients with stroke by hematoxylin-eosin staining method.Then, thrombi in fluid model were utilized to establish embolization of vessels in swine model ( two pigs ) for evaluation of radiopacity.Independent-Sample test was performed to compare the maximum tensile length of two methods , and Fisher′s exact test was used to compare the rate of thrombus fragmentation after catheter injection test.Results The maximum tensile length of two models were (4.28 ±0.23) and (3.16 ±0.13) cm, respectively, and the difference was statistically significant (t=16.38, P<0.01);After catheter injection, the fracture rates of thrombus were 13% (2/15) and 60%(9/15), which were also statistically significant (P<0.05).As to histological structure, thrombi prepared by fluid model showed mixed thrombus structure , which similar to thrombi of stroke patients , But thrombi prepared by static model were replete with erythrocytes under the microscope .A total of eight vessels ( lingual arteries and superficial cervical arteries ) in two swines were successfully occlusive ( TIMI 0 or 1 ) , and sufficient radiopacity of each injected thrombus was observed.Conclusions The thrombi prepared by fluid model not only have good mechanical stability and sufficient radiopacity , but their histological structure is similar to thromboemboli retrieved from cerebral arteries of patients with acute stroke.

BACKGROUND:The experimental animal models can be used to in-depth investigate the effect of ultrasound and contrast-enhanced ultrasound in the diagnosis and treatment of ischemic biliary lesions. But there is no report on the phase timing standard of rabbit model contrast-enhanced ultrasound that used in various hepatobiliary diseases. OBJECTIVE:To investigate the ultrasonic appearance of normal rabbit biliary ducts with conventional ultrasonography and contrast-enhanced ultrasonography, and the criterion of contrast-enhanced ultrasonography phase timing of rabbit liver. METHODS:The conventional ultrasonography of hepatobiliary system was performed on 10 healthy New Zealand rabbits, and contrast-enhanced ultrasonography was performed on duct wal s that displayed in conventional ultrasonography, then the features were analyzed. RESULTS AND CONCLUSION:(1) The bile duct of normal New Zealand rabbits showed a portal to biliary caliber ratio of 3.59±0.54. (2) The detection rates of common and middle lobe bile ducts were significantly higher than that of lateral lobe bile ducts on both conventional ultrasonography and contrast-enhanced ultrasonography. (3) The phases of contrast-enhanced ultrasonography of normal rabbit liver were divided into arterial phase (10-20 seconds), portal phase (21-30 seconds) and late phase (31-180 seconds). The normal duct wal presented hyper-enhancing at arterial phase and persistent iso-enhancing at portal and late phases. The establishment of these parameters of normal New Zealand rabbits not only lays a foundation for the application of contrast-enhanced ultrasonography on biliary ischemia but also expands to other hepatobiliary models.

Objective:To analyze the cytopathologic and sonographic features of false-positive diagnosis in fine-needle aspiration (FNA) of thyroid nodules.Methods:The false-positive diagnosis of thyroid nodules FNA which was confirmed by histopathology in the Affiliated Hospital of Sun Yat-sen University from Jan 2016 to Sep 2020 were collected and analyzed.Results:A total of 2, 626 patients with 2, 971 thyroid nodules were performed ultrasonography (US)-guided FNA, and 1, 061 thyroid nodules (35.7%) were confirmed by histopathology.Among these 1, 061 nodules, 817 (77.0%) were histopathologic malignancy, and 748(70.5%) were cytopathologic malignancy (TBSRTC Ⅴ-Ⅵ). Twenty-one patients with 23 thyroid nodules were false-positive diagnosis, showing TBSRTC Ⅴ, with a false-positive rate of 9.4%. In these false-positive cases, 18 patients showed normal thyroid function and 13 showed negative thyroid antibodies. All the false-positive nodules showed part of cytopathologic features of papillary thyroid carcinoma, but were insufficient to diagnose TBSRTC Ⅵ. In sonographic features, 16 nodules (69.6%) were classified as ACR TI-RADS 2-4, 12 (52.2%) were classified as C-TIRADS 3-4A or sonographic benign, and none of the nodules were found suspicious cervical lymph nodes metastasis.Conclusions:The overlapping of cytopathologic features is the main cause of false-positive diagnosis in thyroid nodules FNA. Sonographic features may play a role in decreasing the false-positive diagnosis.