ISSN 1004-4140
CN 11-3017/P

## 2006 Vol. 15, No. 4

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Display Method:
2006, 15(4): 1-6.
Abstract(943) PDF(1)
Abstract:
We present a approach to accelerating isosurface reconstruction for cone-beam CT volume data by exploiting the power of programmable GPU,and improve on several aspects,achieve much better performance of Marching Cubes algorithms.Then we Introduce Depth Peeling technique to implement order-independent transparency,achieving better comprehension of the volume data and defect inspection.
2006, 15(4): 7-12.
Abstract(761) PDF(2)
Abstract:
In this paper,essential problems in the development of analytic algorithms for cone beam reconstruction are stated.It treats relevant mathematical theories and numerical computing approaches and goes into detail with respect to interrelationship and interactive effects between these algorithms.Some crucial subjects in future work of this field is also introduced and discussed.
2006, 15(4): 13-17.
Abstract(871) PDF(1)
Abstract:
Objective: The medical image segmentation is the foundation of the follow-up operation,just like 3D reconstruction,...etc.of CT Image.Accuracy of Segmentation is very important to the doctor’s judging.This paper study thoroughly the threshold value segmentation arithmetic and deve-lop a kind of software to solve the medical image multi-threshold value segmentation. Method: This software adopts Visual C++ program tools to carry on a development.It’s function module is mak-ing use of the importation document of the MITK to withdraw and deal with the importation data by the pixel value. Conclusion: Compared with the single threshold value segmentation,Multi-thre-shold value segmentation has many advantages.
2006, 15(4): 73-78.
Abstract(734) PDF(0)
Abstract:
Tissue segmentation of single and multi-spectral magnetic resonance (MR) images has been widely studied for the applications on normal aging brain, as well as on the diagnosis studies of Alzheimer's disease (AD), brain trauma and tumor in the recent years. But, the most of proposed methods in the published papers, the tissue segmentation was considered as problems of statistical decision, pattern classification, cluttering, image processing and analysis. The parameters used for tissue segmentation in those methods were the gray scalar/vector in single/multi-spectral images, which indirectly reflected the physical characteristics of the tissue. And those methods addressed the problems of tissue segmentation as the partitioning concourse of the components in a pixel in finite sets. So the results of the tissue segmentation obtained by conventional methods were unreasonable in some sense. This paper presents a new method of tissue segmentation based on the principle of spectroscopic decomposition of MR images, which consider the tissue segmentation as the problem of the estimation of MR physical parameters of the issues. This method can be used for suppressing not only fat MR signal in magnetic resonance imaging (MRI) but also water signal in magnetic resonance spectroscopy (MRS). Thus, this method is called the spatial and spectral MR imaging.
2006, 15(4): 18-21.
Abstract(838) PDF(2)
Abstract:
With the application of Cone-beam Computed Tomography theories,the paper designed a small part of testing system.This system can carry on the examination to individually the small part,the examination time short,the imagery resolution is high,and can finally realize the three-dimensional display;This equipment has the miniaturization and the transportable characteristic,can use in the field work.
2006, 15(4): 22-25.
Abstract(965) PDF(0)
Abstract:
Objective This study was designed to explore the value of multi-slice spiral CT in the diagnosis of vertebrobasilar dolichectasia(VBD). Methods The diameter,the bifurcated height and transverse position of basilar artery(BA) on multi-slice spiral brain CT images of 2658 patients were measured to find out vertebrobasilar dolichectasia cases by according to the definition of WR Smoker,et al. Results The basilar artery could be demonstrated clearly in 2379 out of 2658 on multi-slice spiral CT images which were obtained by reconstruction at 3mm slice thick using images of 8mm slice thick.16 vertebrobasilar dolichectasia cases accorded with diagnostic criteria outlined by WR Smoker et al were found,and the CT finding and clinical representations were similar to those reported in the literatures. Conclusion 89.50 % basilar artery could be displayed on multi-slice spiral brain CT images according to the methods mentioned,then vertebrobasilar dolichectasia could be diagnosed.
2006, 15(4): 26-29.
Abstract(774) PDF(0)
Abstract:
Object To study the value 16-slice Spiral CT angiography in the diagnosis of upper extremity arterial disease. Material and methods Thirteen suspected patients with blocked disease of super extremity arteries were examined with CTA,all performed Volume Rendering(VR)、Maximum Intensity Projection(MIP)、Multiplana(rMPR)。 Results Constrictions were found in subclavian arteries of 9 patients,occlusion was found in the left brachial artery of one patient and aneurysm was found in the right axillary artery of one patient.8 cases were proved by DSA. Conclusion 16-slice Spiral CT Angiography in upper extremity is an accurate and non-invasive angiographic technique.
2006, 15(4): 30-33.
Abstract(757) PDF(0)
Abstract:
Objective: To study the clinical manifestations,CT and MRI diagnosis and differential diagnosis of cysts in lumbosacral canal,to make a further understanding of the disease. Methods: Imaging features in 19 patients with pathologically proved cyst lumbosacral canal,were retrospectively analyzed.MRI was performed in all 19 cases,of which additional CT scan was carried out in 11 cases. Results: The enteric cysts in 2 cases,spinal meningeal cysts in 17 cases;2 cases are multiple,17 cases are single,there are 7 cases were discovered by CT scanning in 11 cases,all were discovered by MRI. Conclusion: MRI was the best examining method for diagnosis of spinal meningeal cyst.Thus,MRI was helpful for its diagnosis and management.CT scanning had certain diagnostic value.
2006, 15(4): 34-36.
Abstract(711) PDF(0)
Abstract:
The diagnosis of breast diseases depends on digital mammographs.Because of the breast calcify is small and noise is hard to avoid,image enhancement in digital mammographs is necessary.The effect of image enhancement changes in different methods.With the application and comparison of various image enhancement methods,we hope to get the best one in digital mammographs.
2006, 15(4): 37-40.
Abstract(1069) PDF(0)
Abstract:
Objective To discuss the CT and MRI display of the Madelungs disease. Methods: Link the literature and review clinic date of 16 cases Madelungs diseases,review date of 16 cases Madelung`s diseases all were made sure by the clinic department from 2003-5~2006-1,the male 15 cases,the female 1case..apply CT and MR scanning the mandible and the neck。MR scanning all apply the squence of fat-restrain. Result: In the 16 diseases,fat stack in the beel of neck and the double side of shoulder with 4 cases display;the fat stack in the double side of the lower jaw and both said of the side-pharynx clearance and parotid clearance with 9 cases;the fat stack in the double side of the lower jaw and fore-neck and the double side of the up-clavicle with 3 cases;CT and MR scan with contrast displaying no singularity.The track and the distributing of the blood vessel were not out of the way.All the sequence of the MRI display the normal tissue of fat.singularity signai were not found.
2006, 15(4): 41-43.
Abstract(833) PDF(0)
Abstract:
objective To explore the CT signs and clinical character of pelvic tumor in female。 Methods CT scan were applied to 46 cases pelvic tumor in female,in which enhancement study were done in 21 cases.All cases were proved by operation and pathology,and the CT findings were analyzed. Results In these 46 cases had 69 locus,single locus in one cases were 24 cases(34.7%),double locus in one cases were 32 cases(46.38%),and more than 2 locus in one cases were 13 cases(18.84%), Conclusion The CT findings of pelvic tumor in female is characteristic,and easy to do,so CT scan should be the first method in clinical diagnosis of pelvic tumor in female.
2006, 15(4): 44-47.
Abstract(840) PDF(0)
Abstract:
Object To summarize and analyze the imaging of cavernous sinus cavernous hemangiomas. Methods Retrospectively analyzed the imaging findings of 6 cases of cavernous sinus cavernous hemangiomas proved by surgery and pathology. Results Among 6 cases,4 cases is high signal on T1 weighted,2 case is seem signal on T1W,and 4 cases the lesion show slightly hyper-intensive in plain CT scan of head,in post-contrast scan the lesion is enhanced markedly and asymmetry. Conclusion Imaging findings of cavernous sinus cavernous hemangiomas have some characteristic,and it is helpful to the diagnosis and differential diagnosis of the mass lesions in cavernous sinus.
2006, 15(4): 48-53.
Abstract(789) PDF(1)
Abstract:
Objective: To compare the age distribution and characteristic MR imaging findings of ependymomas for each typical location. Materials and Methods: 58 cases of ependymomas with histologically confirmed were retrospectively reviewed in terms of age distribution,location,size,pattern of growth,signal intensity,the presence or absence of cyst and hemorrhage as well as enhancement pattern on MR imaging. Results: Among the 58 patients,supratentorial ependymomas were 27(46.6%) cases,and the age distribution of most cases was between the third and fifth decade,20 cases of supratentorial ependymomas lie in lateral cerebral ventricle.Infrartentorial tumors were 20(34.5%)cases,and the age distribution of cases was before the second decade,almost of infrartentorial tumors lie in the fourth ventricle.Spinal cord ependymomas were 11(18.9%).The signal intensity of the ependymomas was non-specific,regardless of their location.A cystic component was seen in 70.4% of supratentorial,55% of infratentorial,and 18.2% of spinal cord ependymomas.The spinal cord ependymomas which were associated with reactive cysts were 45.5%.Intratumoral hemorrhage occurred in 29.6% of supratentorial,20% of infratentorial,and 9% of spinal cord tumors.Eighty percent of lateral cerebral ventricle ependymomas extended to opposite side ventricle,In fourth ventricle,16 cases of tumors extended caudally via Magendie foramen,and 12 cases into the cerebellopontine angel through the foramen of Luschka.All spinal cord ependymomas showed epicentral growth,and intervertebral foramina enlarged was displayed in one case of filar ependymomas. Conclusion: Ependymomas for each typical location have differential in age distribution,cystic component and enhancement pattern.Desmo-plastic development(plasticity growth) is significant feature of cerebro-ventricular ependymomas.Awareness of these difference is in favor of correct preoperative diagnosis.
2006, 15(4): 54-57.
Abstract(779) PDF(0)
Abstract:
Objective To evaluate diagnostic values of spiral CT-3D and MPR in the benign lesions of the thoracic inlet. Materials and methods: Retrospectively analysis CT findings of 51 cases benign lesions proved pathologically or DSA or clinic at the thoracic inlet. Results: 51 cases benign lesions at the thoracic inlet Include the trachea source lesion 8 cases,and apical lung hernia 3 cases and apical paraseptal blebs 2 cases and benign masses of thyroid 21 cases and esophagus diverticula 3 cases and lymph nodes tuberculosis 5 cases and vascular lesions 9 cases and neurolemmoma 1 cases. conclusion: Spiral CT-3D and MPR is important supplement means in the diagnosis and differential diagnosis of the benign lesions in the thoracic inlet.
2006, 15(4): 58-60.
Abstract(750) PDF(1)
Abstract:
This paper is describe the using experiences about application and service for Shimadzu CT-4800,which in absence servers menu and circuit diagram,in this hospital.
2006, 15(4): 61-67.
Abstract(852) PDF(1)
Abstract:
Computed tomography angiography has become an important technology of diagnosing vessel diseases due to its non-invasiveness and acquisition speed.Getting images of optimal quality requires the main scanning is started once the bolus concentration is high enough.At the present time,the most commonly used method of detecting bolus is based on image reconstruction.In this paper,based on fan-beam projections,we have proposed a different method by which we can directly get and reflect the bolus dynamics.Comparing with the image-based method,the method based on fan beam projections have better real-time and lower detecting cost due to its needlessness of image reconstruction.
2006, 15(4): 68-72.
Abstract(680) PDF(0)
Abstract:
In this paper,the author proposes the prespecting model of direct cyrrent IP “medium high-medium low-fast-incorrect” by consolidating and studying some of IP datums that he collected during working in the west of luan chuan county In recent years.Analyse certain question that claim attention in application of direct current IP to prospecting Pb-Zn ore.resolve the distinction betwen Pb-Zn ore and other mineral commodity,achieved the good results of prospecting.