Objective:To give the test in cases of changing the conditions of measurement and reference value, compare the test results, and detect the capacity of QuickCheck, so as to offer reference for the daily morning check of accelerator and the evaluation of test results. Methods:Change the output dose, field size, SSD, angle of collimator and gantry angle of the accelerator, and then evaluate QuickCheck’s capacity of monitoring accelerator accordingly. Compare the field parameters measured by QuickCheck with the data from the 3D water tank. Results:When the output dose was 1 cGy higher than the reference value or 6 cGy lower than it, the field size expanded or contracted more than 2 cm simutaneouly, SSD was 2 cm higher or 1 cm lower than reference value, the collimator rotated more than 2 °, the gantry angle rotated more than 6 °, and then the test results of QuickCheck surpassed threshold. Comparing the measuring results of QuickCheck with 3D water tank, the difference between the flatness of the two was 3.84%, symmetry (G/T) 0.67%, symmetry (L/R) 0.47%and dose rate 1.2 MU/min. Conclusion:QuickCheck is rather accurate in testing the output dose, field size, angle of collimator, flatness, symmetry and dose rate, so it could meet the requirement of accelerator’s daily QA. However, its capability is relatively poor on examining SSD and the deviation of gantry angle.

Objective To observe the diagnostic value of telomerase,VEGF,CD44_ V6 ,MMP_2,MMP_9and their combined examination in distinguishing malignant pleural effusion from benign one.Methods Sixty patients with pleural effusions were observed,thirty of them sufferring from malignant pleural effusion and thirty of them sufferring from benign one.The expression of telomerase,CD44_ V6 ,VEGF,MMP_2,MMP_9were tested in the pleural effusion by RT-PCR and ELISA technique.The sensitivity and the specificity of each examination method were calculated,in order to find out appropriate combination.Results As single-item detection,the diagnosetic value of VEGF was the best,the cutoff of VEGF was 181.1pg/ml,the sensitivity of VEGF examination was 90.0%,and the specificity was 86.7%.The sensitivity and the specificity of combined examination VEGF+CD44_ V6 and VEGF+MMP_2 were the best,the sensitivity of VEGF+CD44_ V6 was 83.3%,and the specificity was 90.0%.The sensitivity of VEGF+MMP_2 was 80.0% and the specificity was 93.3%.Conclusion The level of telomerase,VEGF,CD44_ V6 ,MMP_2,MMP_9in malignant pleural effusion is clearly higher than that in benign pleural one,the difference having significant statistic meaning.VEGF has higher sensitivity and specificity .Of combined examination,VEGF+CD44_ V6 and VEGF+MMP_2 have higher sensitivity and specificity.

Objective To explore the value of MR spectroscopy in preoperative grading of astrocytic tumors.Methods 52 cases with astrocytomas proved by pathology,including 20 diffuse astrocytomas,14 anaplastic astrocytomas and 18 glioblastomas,underwent MR spectroscopy with multi-voxel PRESS sequence.Results ①Astrocytic tumors were characterized by increased Cho and decreased NAA,while Lipids were present in high-grade astrocytic tumors;②Cho/Cr(r＝0.656,P=0.000),Lip1.3/Cr(r＝0.559,P=0.001) and Glx/Cr(r＝0.482,P=0.005) in the solitary tumor's regions had a significant positive correlation with the grading of astrocytic tumors, while Cho/NAA(r＝0.395,P=0.025),Lip0.9/Cr(r＝0.386,P=0.029) had a positive correlation with the tmor grading;③When Cho/Cr＝2, the sensitivity, specificity,positive predictive value and negative predictive value for diagnosis of WHO4 astrocytic tumors were 94.4%,64.3%,77.3% and 90% respectively;④When Lip1.3/Cr＝0.526, the sensitivity, specificity,positive predictive value and negative predictive value for diagnosis of WHO4 astrocytic tumors were 88.9%,92.9%,94.1% and 86.7% respectively. Conclusion MR spectroscopy is helpful in preoperative grading of astrocytic tumors.

Objective To investigate clinical effect of recombinant human growth hormone (rhGH)for inter-venting central precocious puberty in children,to provide reference for clinical treatment.Methods 80 patients with growth deceleration slows CCP were selected,when height growth rate below 4cm/year,40 patients on the basis of joint GnRHa used rhGH treatment were selected as the observation group,and the remaining 40 patients refused to use rhGH,continued to use of GnRHa treatment were selected as the control group.After treatment predicted height,height,bone age,growth rate and other indicators were compared.Results In observation group,the actual height Ht, predicted height PAH,the growth rate Gv,serum insulin -like growth factor -1 (IGF -1 )after treatment were (1 44.48 ±6.59)cm,(1 54.94 ±4.52)cm,(4.43 ±0.64)cm/6months,(1 32.25 ±8.84)ng/mL,compared to before treatment,the differences were statistically significant (t =6.548,P <0.01 ;t =5.734,P <0.01 ;t =28.869,P <0.01 ;t =20.65,P <0.01 ),compared with the control group,the differences were significant (t =3.943,P <0.01 ;t =4.759,P <0.01 ;t =28.247,P <0.01 ;t =20.882,P <0.01 ),there were no differences in other indices;hor-mones FSH,LH and other indicators of the two groups before and after treatment,and blood sugar,thyroid indicators showed no abnormality.Conclusion Recombinant human growth hormone in the treatment of central precocious puberty deceleration in children does not increase bone age,which will help improve the growth rate and predicted height,which worthy of clinical application.

Objective To analyze the factors influencing fiducial number used for tracking abdominal tumor with stereotactic body radiation therapy (SBRT),which was implemented by CyberKnife.Methods 254 abdominal tumor patients chosen which adopted fiducial tracking and classified the fiducials.We gathered data of the patients with ＜ 3 fiducials used for tracking and patients with ≥ 3 fiducials respectively,and analyzed the reason why ＜ 3 fiducials were left for tracking.Results Among 254 patients,22 patients were showed that the number of fiducial implantation were equal to play number of fiducial;232 patients with no equation which 49 patients (21.1％) used ＜ 3 fiducials for tracking,183 patients (78.9％) used ≥3 fiducials for tracking.Among the 49 patients with ＜3 fiducials for tracking,9 patients had fiducials migrated,1 patient had an unrecognizable fiducial,23 patients had the implantation not qualified for tracking,and 16 patients had the rigid error surpassing the threshold.Conclusions 78.9％ patients were implanted ≥ 3 fiducials and thus qualified for fiducial tracking.Major reasons of disqualification include insufficient implanted fiducials,unqualified implantation and rigid error surpassing the threshold.

In order to guarantee the safety and accuracy of the whole treating process as well as better link up of each section during the treatment, we did research in order to establish a project concerning the process quality control (PQC) of treating liver cancer with CyberKnife. From the safety and accuracy point of view, we divided the whole process of treating liver cancer with CyberKnife into ten links, i.e. the registration of patients' information, the im plantation of fiducial markers, fixation of body posture, CT localization, target delineation, design of the treatment plan, quality assurance in physics, implementation of the treatment plan, inspection on the correctness and data archiving. We analyzed the possible mistakes in each link and the consequences brought by them. To smoothly connect all the links, a special part "Attention" was added between every two links. Various wrong operations which may influence the safety and accuracy of treatment were illustrated, and the consequences brought by them were also ex plained. The "Attention" part among links offers important information for the next step, and gives us reminding and warnings. The project of quality control covers all the important links when treating liver cancer with Cy berKnife. It offers regulations, reminding and warning for us so that the safety and accuracy of treatment can be guaranteed, and the work of all staff could be closely connected.
Humans ; Liver Neoplasms ; surgery ; Quality Control ; Radiosurgery ; methods

OBJECTIVE To study the antibacterial activity of pazufloxacin in vitro against bacteria isolated from(patients) with respiratory and urinary tract infection,compared with levofloxacin,ciprofloxacin,cefuroxime and(cefotaxime) to provide guideline for clinical application.METHODS The infected bacteria were identified by the(fully) automatic VITEK system.The susceptibility test was determined by MIC method and K-B disk diffusion method respectively.RESULTS The sensitivity of most Gram-negative bacteria to pazufloxacin was basically the same to levofloxacin,cefotaxime, etc.However,the sensitivity of Pseudomonas and Acinetobacter to(pazufloxacin) was higher than to other four antibiotics;the sensitivity of Gram-positive cocci,particularly(Streptococcus) to(pazufloxacin) was obviously lower than cephalosporins and no better than other quinolones.(CONCLUSIONS) The antibacterial activity of pazufloxacin in vitro against the bacteria isolated from patients with(respiratory) and urinary tract infection is comparatively strong,especially in the urinary system.Pazufloxacin has an excellent broad-(spectrum) and strong antibacterial activity.However,the antibacterial activity against Gram-positive cocci is(expected) to promote.

Objective To evaluate the application of mobile ultrasonoscope in earthquake rescue. Methods According to the characteristic of environment and traumatic conditions in earthquake area, the mobile ultrasonoscope was used to diagnose for clinicians, and the advantages and disadvantages were evaluated. Results The mobile ultrasonoscope played an important role in routine diagnosis, such as organic injury and calculus, superficial organellae injury, soft tissue injury, injury of limbs and blood vessels, gynaecology and obstetrics and so on. As far as certain conditions were conferred in which the mobile ultrasonoscope was seldom used to diagnose in common practice, it played a dramatic role too in bone fracture, joint damage, craniocerebral injury and foreign objects. Conclusion In routine diagnosis or certain conditions, the mobile ultrasonoscope is very practical, especially in earthquake rescue.

Objective To explore the effectiveness and safety of fiberbronchoscope combined with cryotherapeatic equipment in treatment of bronchial foreign body in children.Methods 72 children with bronchial foreign body received fiberbronchoscope combined with cryotherapeatic equipment, then the complications were observed during and after the operation.Results Bronchial foreign bodies were successfully removed in all the patients. Among the 72 cases, transient hypoxia was the most common complication during the operation which happened in 37 cases and most occurred in the small age group, and decreased with the age increasing; cough or worsening of cough was the most common complication after the operation which happened in 20 cases; No serious complications were found during the follow-up.Conclusion Although it has some complications when bronchial foreign body received the fiberbronchoscope combined with cryotherapeatic equipment, but the operation time is short, and the complication is mild. It has great application value and security.

Objective To assess the left atrial early function in pilots with essential hypertension by strian rate imaging (SRI). Methods Twenty-five hypertensive pilots without left ventricular hypertrophy and expansion (LVN) were selected. Twenty-ifve healthy pilots were included as control group. At the left ventricular apical four-chamber view, three-chamber view, two-chamber view, the systolic, early and late diastolic peak strain rate (SRs, SRe, SRa) curves were acquired by SRI in the basal section, the middle section and the upper section of the wall of left atrium. The average strain rate (mSRs, mSRe, mSRa) was calculated. The LA maximal, minimal and pre-systolic volume (LAVmax , LAVmin and LAVp), LA passive ejection fraction (LAPEF), LA active ejection fraction (LAAEF) , left atrial stroke volume (LASV), E/A and E/E′ were calculated. Results The LAPEF, LAAEF, LASV, E/A, E/E′were (38.96±6.43)%, (61.11±5.86)%, (14.74±5.33)mm, 1.23±0.08, 8.63±1.77 in the control group, and were (34.18±5.72)%, (63.23±6.89)%, (10.12±3.23)mm, 1.04±0.26, 7.16±0.84 in the study group. Compared with the control group, signiifcant difference was detect in LAPEF, LAAEF, LASV, E/E′(t=4.840, 2.690, 4.801, 2.950, all P<0.05). No signiifcant difference was found in E/A between the study and control group (t=-1.424, P=0.178). There was signiifcant positive correlation between SRa and E/E′(r=0.632, P<0.05). Conclusion SRI could be applied in the evaluation of early left atrial function. In pilots with essential hypertension, the changes of strain rate in left atrial wall, which is prior to the modeling geometry of left ventricular, could be detected by SRI.