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In this article, a case for random signal interference in resolver (or encoder) of carousel on Varian VitalBeam medical linear accelerator was illustrated. This case was considered as a rare failure of the technology platform (including TrueBeam) by Chinese, European and American technical experts in Varian. In this article, the differences of the carousel in the structure and control system between VitalBeam and traditional accelerator were comparatively analyzed to enable the peers to have a deeper understanding of resolver. The logic and methods to solve the fault were summarized, providing reference experience for analyzing the problems related to carousel. It is found that the interlocking system is imperfect, which provides a factual and technological basis for Varian to optimize the system.
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ObjectiveTo analyze the mental health status of non-psychiatric inpatients in a general hospital， and to explore the relevant influencing factors， so as to provide references for the screening of mental health problems and the construction of intervention models among non-psychiatric inpatients. MethodsA cross-sectional study was conducted among 916 non-psychiatric inpatients in a third grade class A general hospital in Guangzhou， and all the inpatients were assessed using Patient Health Questionnaire-9 item （PHQ-9）， Generalized Anxiety Disorder-7 item （GAD-7）， Athens Insomnia Scale （AIS） and Columbia-Suicide Severity Rating Scale （C-SSRS） to detect their depression， anxiety， insomnia and suicide risk status. Thereafter， univariate and multivariate Logistic regression analysis were used to screen the risk factors affecting the mental health of inpatients. ResultsA total of 339 （37.0%） inpatients with positive mental health problems were screened， and the screening results for each dimension revealed 218 cases （23.8%） of depression， 141 cases （15.4%） of anxiety， 257 cases （28.1%） of insomnia， 42 cases （4.6%） of suicidal ideation and 7 cases （0.8%） of suicidal behavior. Binary Logistic regression analysis showed that female （OR=1.379， P<0.05） was a risk factor for positive screening of mental health problems. Ordinal Logistic regression analysis denoted that age above 60 years old （OR=1.542， P<0.05） and singlehood （OR=2.055， P<0.05） were risk factors affecting the severity of depression， while senior high school to junior college education （OR=0.524， P<0.05） was a protective factor of depression， meantime， female （OR=1.472， P<0.05） was a risk factor affecting the severity of insomnia. ConclusionMental health problems are quite common among non-psychiatric inpatients in general hospitals， and are mainly affected by factors such as gender， age， marital status and educational background.
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Objective To investigate the clinical effectiveness of foam sclerotherapy for lower extremity varicose vein with deep venous valve incompetence.Methods A retrospective study was carried out in 124 patients (185 limbs) receiving foam sclerotherapy in our department.Sixty-one limbs diagnosed as deep venous valve incompetence were categorized as the observation group,while 124 limbs without that were the control group.The main outcome were success rate,remission rate of various symptoms and signs,the scores of CEAP and CIVIQ.Results The follow up rate was 69.3％,and the follow-up period ranged from one to nine months.There was no statistical difference in the success rate between the observation group (93.4％) and control group (94.4％)(P＞0.05).However,the symptom of heaviness and oedema and the CIVIQ scores in observation group be inferior to the control group,and the difference of them were statistically significant (P＜0.05).Conclusion Deep venous valve incompetence could not decrease the success rate of foam sclerotherapy,but may influence the remission of some symptoms.It should be supplemented with medical elastic stockings or ringing of femoral veins.
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Objective To explore the relationships between cholangiocarcinoma and clonorochiasis or hepatolithiasis,and to compare their MRI features.Methods The MRI features in 37 patients with cholangiocarcinoma confirmed by surgery and pathology were retrospectively analyzed,including clonorchiasis with cholangiocarcinoma in 21 (group A)and hepatolithiasis with this tumor in 16 (group B).The analyzed parameters included the location,size,shape,signal intensity and enhancement pattern of the tumor and the characteristics of bile duct dilatation.Results In group A,the tumors were located in the right lobe in 12 (57.2%),left lobe in 4 (19%),and porta hepatic in 5 (23.8%).In group B,those were located in the right lobe in 3 (18.7%),left lobe in 9 (56.3%),and porta hepatic in 4 (25%).There was a significant difference in the left/right lobe between two groups (P0.05).The MRI showed the tumors with low signal on T1 WI and high or heterogeneous signal on T2 WI,and with peripheral enhancement in early stage and delayed centric enhancement in 34 patients.Diffuse saccular dilatations of terminal intrahepatic bile ducts were showed in 1 6 (7 6 .2%)in group A and 1 (6 .2%)in group B,meanwhile the dilatations of bile ducts within tumors were showed in 2 (9.5%)in group A and 13 (81.3%)in group B,exhibiting significant differences between the two groups (P<0.05).Conclusion Clonorochiasis and hepatolithiasis are related with the cholangiocarcinoma.No differences in MRI features of cholangiocarcinoma are found between the two groups,however significant differences in location and the features of bile duct dilatation are observed.
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Purpose To assess the clinical application of non-contrast-enhanced MR angiography (NCE-MRA) using flow sensitive dephasing (FSD) prepared steady-state free precession (SSFP) for displaying hand arteries of patients with rheumatoid arthritis. Materials and Methods Twenty-two patients with rheumatoid arthritis were recruited in this study. All the patients undertook hand NCE-MRA and three-dimensional dynamic CE-MRA on a 1.5T MR scanner. The informed consent was obtained from each subject. Image quality was assessed independently by two experienced radiologists at three arterial segments (wrist arteries, palm arteries, andfinger arteries) with a four-point scale. Signal to noise ratio (SNR), contrast to noise ratio (CNR), and vessel sharpness were evaluated by a magnetic resonance physicist. The results and image quality were statistically compared between the two MRA techniques.Results Twenty-two patients of 24 hands successfully underwent NCE-MRA and CE-MRA scan. Among 72 vascular segments, 69 segments of NCE-MRA were diagnostic, which was higher than that of CE-MRA (96% vs 83%,P<0.05). Otherwise, the image quality, SNR, CNR and vessel sharpness of NCE-MRA were all superior to those of CE-MRA (P<0.05).Conclusion NCE-MRA using FSD-prepared SSFP allows clear depiction of the hand arterial tree, and the image quality is superior to that of dynamic CE-MRA. It is a potential tool for evaluating the disease of hand arteries.
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Objective To study the efficacy of different anti-adhesion agents used in preventing tubal obstruction after recanalization.Methods Five hundred and eight patients with tubal obstruction were divided into 245 cases in control group,108 cases in chitosan group;113 cases in sodium hyaluronate group and 42 cases in lipiodol group.The patients in control group were injected with anti-inflammation agents after recanalizatian,while other groups were injected with chitosan,sodium hyaluronate or lipiodol at dose of 2-3 ml in every therapeutic group.The rate of location of tubal obstruction and tubal recanalization were recorded during operation.Then patients in every group were followed up on tubal patency after 3 months,and pregnancy rate after 12 months.Results Among 1016 fallopian tubes in 508 patients,there were 330 tubes occlusion at isthmus portion and 563 tubes occlusion at interstitial portion of fallopian tube.Thirtyseven fallopian tubes were ablated because of ectopic pregnancy,86 fallopian tubes were unobstructed.(1)The recanalization rate were 95.7% (179/187) in chitosan group,97.9% (191/195) in sodium hyaluronate group,98.7% (75/76) in lipiodol group and 97.7% (425/435) in control group,which did not show statistical difference (P＞0.05).(2) The rates of tubal patency after 3 months of 91.7% (99/108) in chitosan group and 88.5% (100/113) in sodium hyaluronate group were significantly higher than 71.4% (30/42) in lipiodol group and 74.3% (182/245) in control group (P ＜0.05).(3)The rates of intrauterine pregnancy after 12 months were 48.1% (52/108) in chitosan group and 41.6% (47/113) in sodium hyaluronate group,which were significantly higher than 23.8% (10/42) in lipiodol group and 24.1% (59/245) in control group (P ＜ 0.05).Conclusion Chitosan and sodium hyaluronate could be effective to prevent tubal obstruction after interventional recanalization and increase pregnancy rate.
