Investigation of posttraumatic stress disorders after accidents in Pearl River Delta * / 重庆医学

Objective To investigate the incidence and related risk factors of post-traumatic stress disorders (PTSD) after acci-dents in the Pearl River Delta .Methods Inpatients after accidents from April 2009 to February 2010 in seven hospitals of the Pearl River Delta cities ,such as Guangzhou ,Shenzhen and Zhuhai ,were surveyed with PTSD Checklist-Civilian Version (PCL-C) and self-made questionnaire .Results In a total of 554 post traumatic patients ,a prevalence of 28 .5% of PTSD symptoms were found in this region with 7 .8% (marks≥50) of severe degree and 20 .8% (marks :38-49) of mild to moderate degree .In the severe PTSD symptoms group ,the top three items were getting nervous and upset once faced similar situation ,difficulty sleeping or easy to be a-wake ,and the trauma experience caused recurring disturbing memory ,ideas or image .Multivariate analysis showed that female ,una-ble self-care ,incapable of working ,lack help from friends ,multiple injury ,and injury time longer were all associated with the PTSD symptom incidence .Conclusion The prevalence of PTSD symptoms is relatively high in injured patients after accidents in the Pearl River Delta .Early identification and intervention of PTSD symptoms in post-traumatic patients are important for the prevention of PTSD .

Initial application of prospective electrocardiography-triggering high-pitch spiral acquisition by dualsource CT in children with congenital heart diseases / 中华放射学杂志

Objective To explore the clinical value of prospective electrocardiography-triggering high-pitch spiral acquisition by dual-source CT (HP mode ) in children with congenital heart diseases (CHD).MethodsThirty-six patients ( mean age:0.67 years,range:1 month to 2 years and 6 months; 25 males;mean weight:7.7 kg)underwent prospective ECG-triggering high-pitch spiral acquisition.The dose length product (DLP) was recorded to calculate effective dose ( ED ).Two experienced radiologists made diagnosis and assessed the overall image quality by a five-point scale independently.The consistency of their judgment was determined by Kappa statistics.Surgeries were performed in 29 patients,and conventional cardiac angiography(CCA) was performed in 7 patients.The accuracy,sensitivity and specificity of HP mode were calculated based on the surgical or CCA findings.ResultsThe DLP was (5.12 ± 1.64) mGy.cm with a range of 2.4 mGy · cm to 9.2 mGy · cm and ED was (0.125 ± 0.027 ) mSv ranging from 0.078 mSv to 0.179 mSv.The average subjective image quality score was 4.2 ± 0.7.All images were diagnosable.Two radiologists made good agreement ( K =0.774,P ＜ 0.05 ).The accuracy,sensitivity and specificity of HP mode were 98.9％,94.2％ and 99.8％,respectively.ConclusionLow radiation dose with the accurate diagnosis of anomalies makes HP mode a new choice for children with CHD.

Finite element analysis of the initial stability of subtalar arthrodesis with double-screw fixation / 南方医科大学学报

<p><b>OBJECTIVE</b>To assess the optimal configuration of double-screw fixation for subtalar arthrodesis using finite element analysis.</p><p><b>METHODS</b>Three-dimensional finite element double-screw models of subtalar arthrodesis were reconstructed using Mimics 13.0, Geomagic 10.0 and solid works software based on the 3-D images of the volunteer's right foot. The external and internal rotation torques of 4 N·m were applied, and the micromotion at the bone-to-bone interface were measured to evaluate the initial stability of subtalar arthrodesis.</p><p><b>RESULTS</b>A neck screw plus an anterolateral dome screw was the most stable model. The peak micromotion at the fusion site of this fixation configuration were 41.67mnplus;0.49 and 42.64mnplus;0.75 µm in response to the respectively. A neck screw plus a posteromedial dome screw was the least stable model, with peak micromotion at the bone-to-bone interface of 61.76mnplus;1.00 and 62.32mnplus;0.90 µm, respectively.</p><p><b>CONCLUSION</b>A neck screw plus an anterolateral dome screw is the best fixation configuration while a neck screw plus a posteromedial screw provides the least stability of subtalar arthrodesis. Three-dimensional finite element models allow effective preoperative planning of the screw number and placement.</p>

MRI findings of fetal cleft lip and palate / 中华放射学杂志

Objective To investigate the MR findings of fetal cleft lip (CL) and evaluate the advantages and limitations of MRI in the diagnosis. Methods Twelve pregnant women suspicious of fetal CL/cleft palate(CP) on ultrasonography were enrolled in the study. The findings of ultrasonography, MRI and following-up were compared. Results MRI and ultrasonography detected 12 fetuses with CL/CP. The following-up results showed 1 case with incomplete cleft lip and the other 11 cases with complete cleft lips and cleft palates. MRI and unltrasonography were consistent with the follow-up in CL detection, showing completed or uncompleted soft tissue interruption of the fetal lips with amniotic fluid filling which is high signal on T_2WI. On MRI, CP showed discontinuous of the soft tissue which were interrupted by long T_2 signal and communicating with oral cavity and nasal cavity. MRI missed 1 case and excluded 1 case of CP. Ultrasonography predicted 5 case of CL, excluded 1 CP but missed 6 cases. The accuracy, sensitivity and specificity in detection CL/CP was 91.7% (11/12), 90.9% (10/11), 100% (1/1) for MRI and 50.0% (6/12),45.5% (5/11), 100% (1/1) for ultrasonography, respectively. Conclusion MR imaging had advantage over ultrasonography in detecting CP, MRI is an essential when CP is suspicious on ultrasonography.

Magnetic resonance imaging guided bone biopsies in the iPath-200 system / 中华医学杂志(英文版)

<p><b>OBJECTIVE</b>To study the clinical value of a new MRI compatible percutaneous bone biopsy system.</p><p><b>METHODS</b>Twenty-six patients with bone lesions MRI-guided biopsies underwent using a 0.23-T open MR system combined with an iPath-200 optical leading system.</p><p><b>RESULTS</b>Of the 26 biopsies, 23 samples were sufficient for histological examination and the histopathologic diagnoses were confirmed. In the high-risk areas like spine, the biopsies were successfully done in 11 patients. No procedural complications occurred.</p><p><b>CONCLUSION</b>Percutaneous biopsy of bone lesions performed under MRI-guidance in an iPath system was proved to be accurate and safe.</p>

Clinical application of interventional MR with optical navigating / 中华放射学杂志

Objective To introduce the procedures and to evaluate the application value of the optical navigating interventional MR-guided percutaneous biopsies and therapies. Methods Thirty-five of 54 patients (33 males, 21 females) underwent percutaneous biopsies and 19 of 54 patients underwent percutaneous therapies under optical navigating interventional MR-guidance. The age ranged from 9 months to 78 years (mean 38.8 years). All patients were performed under a 0.23 T open MRI system (Proview, Philips Medical System) with optical navigating system (iPath 200, Philips Medical System). The needle and bone biopsy drill were MR-compatible (Daum, Germany). Results Punctures were accurate in all patients (54/54). 33 of 35 biopsies got the pathological diagnosis. All therapies (19/19) got the definitive curative effect. All patients had no obvious complications, such as severe hemorrhage, viscera or nerve injury.Conclusion iPath 200 interventional MR-guided percutaneous biopsies and therapies are accurate and safe techniques.

Study of Stomach Using Ferric Oxide Suspension as Oral Contrast Agent in MRI / 实用放射学杂志

Objective To evaluate the applied value superparamagnetic Ferric Oxide oral contrast agent in the dignosis of MR forstomach.Methods Ferric Oxide Suspension was administered before MR scanning of stomach in 36 cases,ranged in age form 21 to 60 years old.MR findings were analysed.Results The fullness of stomach was 100% after administration of Ferric Oxide Suspension.Stomach canal appeared as negative contrast in all MR sequences,the relation between lesions in stomach and around tissue were clearly showed.During MRCP,it could restrict the high signal in stomach canal.Conclusion Oral Ferric Oxide Suspension as contrast agent during MR examination of stomach is easily accepted by patients,it is a safe and steady negative contrast agent for gastrointestinal MR examination.