The dual source computed tomography is equipped with two X-ray tubes and two corresponding detectors.With its 83 ms-temporal resolution of single segment reconstruction,high quality coronary artery CT angiography can be acquired without heart rate control.Dual energy output by two x-ray tubes improves the differentiation of body tissues,clinical application and lesion diagnostic accuracy of CT.

Objective To discuss the construction and principal of dual-source CT,as well as its superiorities in imaging of heart coronary artery and the clinical application of dual energy technique.Methods The structure of Siemens 64-slice CT was analyzed.The superiorities of dual-source CT in imaging of heart coronary artery were compared with conventional multi-slice CT,and the clinical value of dual energy technique was discussed.Results The dual-source computed tomography had high temporal resolution superiority,and high quality coronary artery CT angiography could be acquired without heart rate control.Dual energy technique could be applied to differentiate tissue component,display given tissue,evaluate the content of iodine in tissue.Conclusion Dual-source CT can not only enhance the diagnosis veracity of pathological changes of heart coronary artery but improve the ability of CT in tissue differentiation.

External hard disk with USB interface is used to storage CT raw data so as to solve the question that CT raw data cannot be storage for long time. This method benefits CT clinical work and scientific research. Compression and storage of CT raw data will play an important role in CT data storage.

Extracranial carotid athcrosclcrosis is the major cause of ischcmic stroke.The intumescence of carotid atherosclerotic plaque in meries results in lumen stenosis or detachment of plaque organisms.causing the distal vascular embolization,and thus resulting in a reduced cerebral blood supply and cerebral ischemic event.The volume data acquisition of multislice spiral CT angiography can provide high-quality two-dimensional and three-dimensional images,its imaging technique has become a very effective detection tool for carotid atherosclerosis.This article reviews the diagnosis application of multislice spiral CT angiograohy of carotid atherosclerosis and its pitfalls.

Atypical teratoid/rhabdoid tumor of the central nervous system has aggressive growth with high potential CSF dissemination and frequently affects very young children.The tumor contains rhabdoid cells and primitive neuroectodermal,malignant mesenchymal and epithelial elements.Immunohistochemistry is helpful in differentiating atypical teratoid/rhabdoid tumor from primitive neuroectodermal tumor/medulloblastoma.Atypical teratoid/rhabdoid tumor is cytogenetically characterized by monosomy 22 or deletion of chromosome band 22q11.2.Intensified therapy combined with surgical resection has been suggested for its treatment.Due to the secondary cystic/necrotic changes and hemorrhage,the imaging features of the tumor are variable.

Objective: To evaluate the application value and potential faults of Dual-source CT in carotid arterial angiography.Methods: We retrospectively analyzed the images of 477 patients with symptomatic carotid atherosclerosis detected by dual-source CT angiography(CTA) from February 2007 to January 2008,and evaluated the quality of the images,which were classified into 3 quality grades: excellent(with clear display of the lesion and no noticeable motion artifacts,good(with a few motion artifacts but still diagnostically applicable),and poor(with heavy motion artifacts,unclear display and no diagnostic value).Results: Of the 477 images,420(88.1%) were of excellent quality,44(9.2%) of good quality and 13(2.7%) of poor quality.Among the total number of cases,134(28.1%) were shown to be normal and 34(7.1%) abnormal in anatomic structure.Atheromatous plaques were detected in 295 cases(61.8%),carotid artery stenting in 11(2.3%),internal carotid artery occlusion in 1,common carotid artery occlusion in 1,and cervical tumor in 3.Conclusion: Dual-source CT,faster,effective and minimally invasive,is particularly valuable in the diagnosis of carotid arterial lesion and stenosis.

Objective To discuss the application of DWI and DTI in diagnosis and evaluation of brain tumor. Methods Combining with literatures, the application of DWI and DTI in brain tumor diagnosis, differential diagnosis, tumors classi- fication, preoperative evaluation, operation plan establishment, follow-up role of treatment were reviewed and evaluated. Results The DWI and DTI were available to brain tumor diagnosis, differential diagnosis and tumor grade. The DTI could be clearly shown the influence of tumor with white matter quality, it was important in operation plan establishment. The combination of intra-operative MRI, functional MRI and DTI was valuable for brain tumor resection. In the meantime, the treatment response of tumor and the changes of treatment-induced white matter were accurately assessed by DTI. Conclu- sion With the MRI hardware and software technology development, the DWI and DTI imaging information can be provided important value in brain tumor pathological changes diagnosis, evaluation, therapeutic planning and post treatment assess- ment.

Different from conventional MRI, Diffusion-weighted(DW) magnetic resonance(MR)imaging is dependent on the molecular motion of water, and provides information on the physiologic state of the brain. In the diagnosis of acute cerebral infarction,the sensitivity is 94% and specificity is 100%. On MRDW imaging, the epidermoid tumors and cerebrospinal fluid or arachnoid cysts, subdura effusions and subdural empyemas,abscess cavities or empyemas and necrotic tumors could be differentiated accurately. MRDW imaging also provides adjunctive information for the diagnosis and evaluation of other cerebral diseases including neoplasms, intracranial infections, traumatic brain injury, and demyelinating processes. As a valuable technique, diffusion-weighted MR imaging should be considered an essential sequence on the diagnosis of brain stroke, and its use in most brain MR studies is recommended.

Objective To observe the clinical efficacy of acupuncture at the trigger points on the back in treating cardioneurosis. Methods Fifty patients with cardioneurosis were selected to receive syndrome differentiation of traditional Chinese medicine, and then were evaluated for the improvement of symptoms respectively after first acupuncture treatment at the trigger points on the back and after 3~5 acupuncture treatments. Results Of the 50 cardioneurosis patients, 30 showed marked effect, 14 showed effective, 6 failed in the treatment, and the total effective rate was 88.0%. The total effective rate was 96.2%in patients of deficient heart yang, and was 75.0%in those of excessive fire due to yin deficiency, 83.3%in those of qi stagnation due to liver depression, and 83.3%in those of deficient heart yin. The improvement rate of subjective symptoms after 3~5 treatments was significantly different from that after the first treatment (P<0.05). Conclusions Acupuncture at the trigger points on the back is an effective approach in treating cardioneurosis, and it can achieve a marked efficacy with successive 3~5 sessions.

Objective With the improvement of technology and strategy , reduced field-of-view diffusion weighted imaging ( rFOV DWI) has provided more robust imaging .This article was intended to compare the clinical utility between rFOV DWI and con-ventional DWI in the diagnosis of prostate cancer . Methods Retrospective analysis was made on 58 prostate cancer patients under-going verification of biopsy or surgery after 3.0 T MRI rFOV DWI and regular DWI examinations in Nanjing General Hospital of Nan-jing Military Command from August 2014 to September 2015 , among whom prostate cancer and benign prostatic hyperplasia were 31 cases and 27 cases respectively .Independent grading was made by 2 radiol-ogists who were unaware of any clinical data and sequences in the as-pects of distortion on DW images , lesion conspicuity on DWI ( b=1000 ) and ADC images according to a 4-point Likert scale .rFOV and conventional DWI sequences were acquired using b =400,1000,0s/mm2.The IVIM double exponential model software was applied to generate ACD value, slow dispersive coefficient(D value) and parameterized image of volume fraction of fast dispersion (f value).Se-quence analysis was made in suspected peripheral tumor regions of prostate cancer patients and and healthy peripheral zones of patients with benign prostatic hyperplasia respectively to get ACD , D and f values .The ratio values rADC , rD and rf were attained compared with obturator internus .ROC analysis was made on the efficacy of different parameters of two sequences in prostate cancer . Results Image qualities of rFOV DWI were rated superior to conventional DWI (P<0.001,Wilcoxon Signed-Rank Test).Compared with con-ventional DWI, ADC value (0.728 ±0.094 vs 0.789 ±0.116, P<0.05)and D value(0.622 ±0.077 vs 0.651 ±0.099, P<0.05)of peripheral tumor regions in rFOV DWI were lower and the difference was statistically significant , whereas no significant difference was found in f value(P=0.932).No difference was found in area under ROC curve of f value between rFOV DWI and traditional DWI (0.853 vs 0.767, P=0.283). Conclusion The rFOV DWI sequence yielded can efficiently improve image quality , which is of important value to the clinical diagnosis of prostate cancer .