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Search Results: 1 - 10 of 9193 matches for " Computer Tomography "
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Features of computer tomography and magnetic resonance imaging in the diagnosis of cranial nerve neurinoma
Nikol`skiy Yu.E.,Chehonatskaya M.L.,Priezshzeva V.N.,Ilyasova E.B.
Saratov Journal of Medical Scientific Research , 2012,
Abstract: In the article described the literary review of advantages and shortcomings of the main modern methods of neuro-radiology in diagnostics the cranial nerve neurinoma.
Utility and efficacy of navigation system use in interventional radiology  [PDF]
Jatin Kaicker, Sriharsha Athreya
Open Journal of Clinical Diagnostics (OJCD) , 2013, DOI: 10.4236/ojcd.2013.33022
Abstract: Background: To ensure precision and accuracy during interventional radiologic (IR) procedures, navigation systems are utilized. There are four main categories of guidance systems that can be used to assist in IR procedures: optical system, electromagnetic (EM) tracking, Cone Bean Computer Tomography (CBCT) and Magnetic Navigation system. Objective: The purpose of this report is to examine some current medical literature to present an impression as to the state of navigation system use in interventional radiology. Methods: Three health databases were selected: Pubmed, Embase and OVID Medline, with the search terms “Interventional Radiology” and “Navigation System” being used. All included studies were presented in English. Studies were excluded if they did not pertain to navigation systems in interventional radiology, were in a language other than English, presented an abstract only or solely discussed interventional cardiology. Results: General themes emerged within the literature for the advantages of navigation system use including benefits to interventional radiologic procedures, increased patient accuracy and reduced procedure time and the potential for reduction in costs. Increased radiation exposure, problems accounting for respiratory motion and sterility remain issues for navigation system use. Conclusion: With potential to better standardize treatment using navigation systems, patients can have access to up-to-date technology for treatment. To ensure the highest standard of care, navigation systems should be used by interventional radiologists only. As indications and clinical efficacy are frequently being defined for navigation system use in interventional radiology, continual review of the published literature and large clinical trials for each system should be pursued.
Computer Tomography and Ultrasonography Image Registration Based on the Cooperation of GPU and CPU  [PDF]
Ying-Chih Lin, Chien-Liang Huang, Chin-Sheng Chen, Wen-Chung Chang, Yu-Jen Chen, Chia-Yuan Liu
Journal of Signal and Information Processing (JSIP) , 2013, DOI: 10.4236/jsip.2013.43B014
Abstract:

Image registration is wildly used in the biomedical image, but there are too many textures and noises in the biomedical image to get a precise image registration. In order to get the excellent registration performance, it needs more complex image processing, and it will spend expensive computation cost. For the real time issue, this paper proposes edge gradient direction image registration applied to Computer Tomography(CT) image and Ultrasonography (US) image based on the cooperation of Graphic Processor Unit (GPU) and Central Processor Unit (CPU). GPU can significantly reduce the computation time. First, the CT image slice is extracted from the CT volume by the region growing and the interpolation algorithm. Secondly, the image pre-processing is employed to reduce the image noises and enhance the image features. There are two kinds of the image pre-processing algorithms invoked in this paper: 1) median filtering and 2) anisotropic diffusion. Last but not least, the image edge gradient information is obtained by Canny operator, and the similarity measurement based on gradient direction is employed to evaluate the similarity between the CT and the US images. The experimental results show that the proposed architecture can distinctively improve the efficiency and are more suitably applied to the real world.

CT Elastography: A Pilot Study via a New Endoscopic Tactile Sensor  [PDF]
Takehisa Sasaki, Mineyuki Haruta, Sadao Omata
Open Journal of Biophysics (OJBIPHY) , 2014, DOI: 10.4236/ojbiphy.2014.41004
Abstract:
Objective: To develop a CT elastography imaging system useful for part of the human body in which ultrasound
is not capable of reaching. The proposed system would measure CT modality through fusion of the stiffness mapping on the images by the tactile sensor system, improving precision of the endoscopic operation. Methods: We made some liver fibrosis phantoms of bovine skin gelatin with various densities as the target organ of the study. Using the tactile sensor system, which requires no compression during endoscopic operation, stiffness of each phantoms was measured. The resulting stiffness vs density curve was evaluated and translated to the stiffness vs CT number (Houndsfield Unit, HU) curve with a CT number vs density curve obtained by CT scan of the phantoms. A transformation formula can be deduced from these curves to the elasticity via CT number, which was confirmed in vitro with pig liver and in vivo CT scan data. Results: The stiffness and CT modality of each phantom was successfully measured and subjected to constant reduction. The CT value shows a linear relationship with the ROI values of the livers used. Conclusion: This paper reports method of supplementing stiffness information measured by a tactile sensor system, with a CT image for use with an endoscope. It is shown that CT number can be derived with a stiffness sensor and CT data in endoscopic surgery. From there results, we prove the possibility of measuring stiffness with CT and high resolution CT number.
Diagnóstico por tomografía axial computarizada de sinusitis esfenoidal
Cinza Sanjurjo,S.; Cabarcos Ortiz de Barrón,A.; Rey Aldana,D.; Lorenzo Zú?iga,V.;
Anales de Medicina Interna , 2006, DOI: 10.4321/S0212-71992006000100006
Abstract: sphenoidal sinusitis is an uncommon pathology potencially dange condition, what we can find in young population. clinically it is very difficult the diagnosis because of its nonspecific symptoms, but cranial computer tomography proves the diagnosis. the most cases were trated with antbiotics and recovered completely. we present a young-man with isolated sphenoidal sinusitis who were managed in our medical centre, and a review the literature.
64 MD CT pregled srca
Markovi? ?eljko,Stojanovi? Vesna,Vukosavljevi? V.,Maksimovi? R.
Acta Chirurgica Iugoslavica , 2007, DOI: 10.2298/aci0703077m
Abstract: In the investigation of ischemic heart disease, cardiac CT imaging is the most effective non-invasive technique for exploration of the coronary arteries now. Thanks to its volume acquisition, cardiac CT is acknowledged to be the best technique for reproducible out-patient exploration not only of the coronary arteries but of all cardiac structures. Over the last 4 years, after a period of technical development and clinical validation, cardiac CT imaging has become a routine examination that is progressively finding a place alongside other types of cardiac exploration. The latest generation of faster, high-resolution devices has pushed back the limits of this technique. Not only coronography but also other modes of imaging in an increasing number of indications are progressively reduced by this complementary examination. We presented our first experiences which we had got through examination of 70 patients.
Solitary fibrous tumor of the orbit presenting in pregnancy
Das Jayanta,Sharma Angshuman,Deka Akshay,Das Dipankar
Indian Journal of Ophthalmology , 2009,
Abstract: A 32-year-old woman, three months pregnant, reported with the complaint of protrusion of the right eye for six months. She gave history of rapid protrusion of eyeball for the last two months along with the history of double vision for the last one month. Computer tomography (CT) scan revealed a well-defined mass lesion in the intraconal space of the right orbit which was excised through a lateral orbitotomy approach. Histological examination and immunohistochemistry revealed a solitary fibrous tumor, which showed a rapid progression in pregnancy.
Beam diagnostics for traumatic brain injury
Hmara T.G.,Chehonatskaya M.L.,Priezshzeva V.N.,Ilyasova E.B.
Saratov Journal of Medical Scientific Research , 2012,
Abstract: The paper presents aliterature review of domestic and foreign sources of modern methods of diagnostics imaging for traumatic brain injury. Information of the magnetic resonance imaging and computed tomography in the of this disease
A Rarely Case: Symptomatic Ectopic Lingual Thyroid
Ramazan BüYüKKAYA, Melih Ergin ERKAN, Yusuf AYDIN, Ayla BüYüKKAYA, Sibel YAZGAN, ?mer YAZGAN, Alp Alper ?AFAK
Duzce Universitesi Tip Fakültesi Dergisi , 2010,
Abstract: Lingual thyroid tissue -totally or partially- occurs at the base of the tongue due to a defect ofembriological migration of thyroid tissue. It is rarely symptomatic and could mimic lingualtumor tissue. We aimed to present a rare case of symptomatic lingual thyroid tissue inconjunction with radiologic, scintigraphic findings and literature review. Case: A 45 year old woman had dyspnea and dysphagia for a long time. Contrast enhanced CTrevealed well shaped, dense homogen lesion with contrast enhancement, narrowwing air columnat the base of the tongue. The lesion was hyperdense when compared with the muscle tissue innon-contrast CT. Ultrasonography revealed hyperechogen lesion. Thyroid gland was not in itsnormal localisation. Clinical and laboratory findings were consistent with subclinicalhypothyroidism. The imaging findings of the patient which were consistent with ectopic lingualthyroid tissue has been reported and verified with scintigraphy. Discussion: f symptomatic ectopic thyroid tissue is not the only thyroid tissue in the body, itis surgically removed. In 75 % of lingual thyroid cases, ectopic tissue is the only functionalthyrod structure in the body, as in our case. Thus, clinicians should be vigilant before planningan operation for removal of the ectopic tissue. As a result, the certain diagnosis of ectopic thyroidtissue protects the patient from unnecessary surgery and possible in terms of early diagnosis ofmalignancy can develop useful.
Applicability of computer tomography in the prediction of egg yolk ratio in hen’s eggs
Gábor Milisits,Tamás Donkó,Zoltán Süt?,Péter Bogner
Italian Journal of Animal Science , 2010, DOI: 10.4081/ijas.2009.s3.234
Abstract: Applicability of computer tomography (CT) was examined for the in vivo determination of egg yolk ratio in commercial hen’s eggs. Altogether 60 eggs were measured by CT, and two different evaluation methods were tested for the prediction of the egg yolk ratio. Because of the overlapping of the X-ray density values of the yolk and albumen, the evaluation based on the X-ray absorption seems not to be useful for the in vivo prediction of the egg yolk ratio. The determination of the surface of the egg yolk on the cross-sectional images resulted in a 69.3-74.1% accuracy of prediction, depending on the number of scans involved in the evaluation.
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