Objective To improve the hardware of a medical radioisotope dose calibration system base on LabVIEW platform.Methods Hiish performance voltage-frequency-converter VFC32 was applied to realize hardware circuit design of medical radioisotope dose calibrator,and the function of the circuit wag analyzed.The output voltage signal from the calibrator ionization chamber was processed by the designed circuit.The output frequency signal from the circuit was obtained by USB-6009 DAQ and was then processed by virtual instrument designed using LabVIEW 8.0.Results Experimental data graphs indicated that the improved system had a better linearity in the low and medium frequency band.Conclusion The redesigned radioisotope dose calibrator has advantages in improving measuring accuracy,measuring range,feeble-minded detection limit and so on.

Objective To assess the clinical value of high-frequency ultrasonography in diagnosis of the brachial plexus disease. Methods Forty-two patients with suspected brachial plexus disease underwent high-frequency ultrasonography. The ultrasonographic findings were compared with clinical data. Results Among the 42 patients, 33 were diagnosed as brachial plexus abnormalities, while 9 as normal according to clinical data. With high-frequency ultrasonography, 26 patients were diagnosed as abnormal brachial plexus and 16 patients as normal. The sensitivity, specificity and accuracy of ultrasonography in diagnosing brachial plexus abnormalities was 78.79%, 100% and 83.33 %, respectively. Conclusion High-frequency ultrasonography is useful in evaluating the brachial plexus disease and may become an important imaging methods for brachial plexus.

Purpose:The aim of this study was to investigate the diagnostic value of color Doppler Ultrasound in Budd-Chiari Syndrome (BCS) with hepatic venous(HV) outflow obstruction.Materials and Methods:The features of ultrasonography in 138 patients of Budd-Chian Syndrome were analyzed and compared with that of angiography.Results:83 patients had membranous obstruction and 45 segmental occlusion of HV.10 patients had HV stenosis.The ultrasound was able to reveal stenosis,atresia,emboli,or membranous obstruction in hepatic venous outflow tract.Collateral branches could be seen between the hepatic veins with short hepatic vein expanded.Both HV and IVC were involved in 35 cases,with thrombus in IVC in 11 and HV in 7.There was two false positive cases and 3 false negative in ultrasound diagnosis.Conclusion: The position and type of occlusion in HV could be accurately detected by color Doppler ultrasound,and so was the existence and degree of collateral circulation,which were of aid for the operation and follow-up.

Objective To evaluate the efficacy and safety of focused ultrasound ablation in the treatment of submucosal fibroids which broke into uterine cavity less than 50%. Methods From Oct. 2006 to Sept. 2009, 66 patients with 69 submucosal fibroids broke into uterine cavity less than 50% diagnosed by MRI in Chinese People's Liberation Army General Hospital were enrolled in this study. They were treated by ultrasound-guided focused ultrasound ablation in the outpatient department, which using the contrast enhanced ultrasonography to assess the efficacy after ablation immediately, to measure reduction of fibroids volume and record adverse effect before and after ultrasound ablation. At 3, 6, 12 and 24 months after treatment, ablation outcome and fibroids volumes were evaluated by contrast ultrasound. The changes of clinical symptom were evaluated by the symptom severity score ( SSS) of the uterine fibroid quality-of-life instrument( UFS-QOL). Results The average volume of fibroids in 66 patients with 68 submucosal fibroids were (151 ±134) cm3 before treatment and (114 ± 104) cm3 no enhanced regional after treatment. The ablation rate of target fibroids was (77 ±16)%. All patients completed this treatment successfully, they were followed up for 6 - 44 months, the median follow-up time was 24 months. No serious complication was observed. However, there were 52% (34/66) patients presented vaginal discharge after ablation, it disappeared gradually after 3 to 4 menstrual cycles. The SSS and the menstrual period symptom scores were significantly lower than that before ablation at the follow-up of 3,6, 12 and 24 months, the rates were 20. 9% , 38. 0% , 45. 1% , 47. 1% and 42. 0% , 63. 8% , 64. 2% , 68. 8% , which all reached statistical difference (P ＜ 0. 05 ). The necrotic fibroids were absorbed gradually, the reduction rates of fibroid volume were 44. 7% ,66. 0% ,77. 7% and 89. 8% . Conclusion It was safe and efficacy that focused ultrasound ablation was used in treatment of submucosal fibroids which broke into the uterine less than 50%.

Objective To assess the clinical outcome of varicose veins with incompetent great saphenous vein(GSV) treated with ultrasound guided foam sclerotherapy. Methods Forty limbs with moderate to severe symptomatic varicose veins with incompetent GSV in 38 patients were injected with foam sclerosing agent (Fibro-Vein) under ultrasound guidance. There were 36 patients with unilateral varicose veins and 2 with bilateral varicose veins. No of them suffered from deep vein incompetence or perforating vein incompetence. Second injection was performed one month after the initial injection in 7 limbs. Thirty-eight of 40 limbs were followed up with clinical examination and duplex ultrasound scan 30-47 months (mean 40 months) after the treatment. Results Among 38 limbs with follow-up mild debilitation was found in two limbs(5. 3%). There were no other symptoms or complications. Duplex ultrasound demonstrated four type of results: type I, sclerosed GSV trunk with no detectable venous flow in 32 of 38 limbs (84. 2%) ;type II,patent GSV trunk in 3 limbs (7. 9%) ,two of them had mild reflux in the GSV trunk;type III,sclerosed GSV trunk and mild reflux in the GSV tributaries, 1/38(2. 6%) ; type IV,sclerosed proximal GSV trunk,patent distal GSV communicated with a superficial vein and mild reflux in the veins, 2/38 (5. 3% ). Conclusions Clinical examination and duplex ultrasound scan demonstrated excellent results of varicose veins with incompetent GSV treated with ultrasound guided foam sclerotherapy 40 months after the treatment. Sclerotherapy is less invasive treatment option for varicose veins with incompetent GSV with satisfactory clinical and cosmetic outcome.

Objective To approach the diagnostic value of contrast-enhanced ultrasonography(CEUS)for the detection of traumatic laceration of pancreas. Methods Sixty cases of pancreatic traumatic model were made in twelve healthy swines after the animals were anesthetized and laparotomized. Then the conventional ultrasonography(US) and CEUS were performed in each case to diagnose the traumatic region,immediately. The results were compared with surgical findings. Results Among sixty injuries,the detection rate of conventional ultrasonography was 66. 7%,the detection rate of CEUS was 88.3%. Conclusions CEUS shows higher detection rate than conventional US in diagnosing pancreatic laceration,and it also can improve the diagnostic value of ultrasound for the detection of pancreatic laceration.

Objective To study the worth of echo-tracking and M-echo in evaluating artery stiffness comparatively.Methods Fifty two rabbits were divided into 4 groups randomly:control group 1,hypercholesterinemia group,control group 2,and artherosclerosis group,there were 13 rabbits in each group.The rabbits were bred with normal or 2% cholesterol animal feeds according to their groups.The femoral artery blood pressure were measured with catheter.Artery stiffness of abdomen aorta of every rabbit was evaluated by echo-tracking and M-echo at the baseline and the end of the study by 2 doctors,and each doctor did twice.Results All the rabbits of artherosclerosis group had lipid plaques in the thorax and abdomen aortas,and the interior elastic fibers board under the plagues were disrupted.Echo-tracking was more stable and sensitive than M-echo in evaluating artery stiffness.pressure-strain elastic modulus(E?) and stiffness index(?) were sensitive stiffness indexes,but arterial compliance(AC) was not.The indexes of artery stiffness evaluated by echo-tracking with short view of the artery were stable too,but not sensitive compared with long view.E? was relative to diastolic diameter of artery and HDL-C positively(P0.05).Conclusions Echo-tracking is more stable and sensitive than Mecho in evaluation of artery stiffness,long view of the artery should be applied in the evaluation of artery stiffness with the technique of echo-tracking.E? and ? were sensitive artery stiffness indexes,but AC was not.

Objective To evaluate the diagnostic value of gray scale contrast-enhanced ultrasonography(CEUS) in the diagnosis of active hemorrhage of the kidney.Methods Forty-six active hemorrhage animal models were created within the kidney of 23 New Zealand rabbits heparinized under general anesthesia,rabbit kidneys were examined by routine two dimensional ultrasonography and CEUS.Results Routine ultrasonography showed 26 traumas with irregular and poorly defined margins.CEUS showed all active bleeding sites,contrast agents overflowed from injured blood vessel and formed irregular remarkable enhanced parts.After average 85s for contrast agent was injected,the intensity of the enhanced regions in the kidneys were significantly higher than those of normal renal parenchyma.Conclusions CEUS could clearly demonstrate the active hemorrhage in traumatic kidney and could significantly improve the diagnostic level of ultrasonography.