نتایج جستجو برای ct scan

تعداد نتایج: 124920  

2010
Paolo Pelosi, Marcelo Gama de Abreu,

In the last 20 years, the use of computed tomography (CT) to evaluate thoracic diseases has rapidly gained popularity and CT has become firmly established as an important research and diagnostic modality. In particular, CT has played an important role in improving our knowledge about the pathophysiology of the adult respiratory distress syndrome (ARDS) and in determining the morphological and f...

2007
Guang Dong,

Study objectives: This study was performed to determine whether transbronchial needle aspiration (TBNA) biopsy under CT guidance can increase its diagnostic yield so that this technique can be used for staging of lung cancer at our institution. Study design: After an initial unacceptable low yield of TBNA on the first 10 patients (20% positive), we switched the biopsy procedure from the broncho...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه فردوسی مشهد 1388

در این پروژه روشی برای مدل سازی قطعات صنعتی از عکسهای ct ارائه شده است. در فصل دوم فیزیک پرتو برداری ct و تولید تصویر به اختصار توضیح داده شده است. در فصل سوم الگوریتمهای پردازش تصویر که در این پروژه به کار رفته شرح داده شده است. توسط این الگوریتم ها عمل قطعه بندی و شناسایی لبه انجام می شود که در فصل مذکور روش های لبه یابی به کمک الگوریتم sobel و canny و مزایا و معایب هر کدام تشریح شده است و در...

Alireza Karimian, Arman Rahmim, Mahdi Nasri Nasrabadi, Nematollah Ahmadi Jeshvaghane,

Introduction: The CT machine utilizes a bowtie filter to shape the X-ray beam and remove lower energy photons. Configuration of this bowtie filter is complex and its geometry is often not available in detail. It causes the CT dose index (CTDI) be with the different values in measurement versus Monte Carlo simulation studies and other analytical calculations. It is important esp...

Background and purpose: Contrast-induced nephropathy (CIN) as a common complication of administration of contrast media (CM) is a major source of hospital morbidity and mortality. The aim of this study was to determine the incidence of CIN after contrast-enhanced CT scan and identifying the related risk factors. Materials and methods: A cross-sectional study was carried out in 100 patients att...

Introduction: One of the most valuable goals of phantoms, replacing with human goals in the field of research and quality control of diagnostic X-ray systems. There are various algorithms and methods for obtaining Homogeneity and CT number linearity for CT scan device. One of the most famous of these methods, the method is to use a uniform and homogeneous environment to comput...

2012
Panil Kumar,

Trauma is a major health problem and is a leading cause of death in the age group 1 – 45 yrs. Head injuries caused or contributed to death in most trauma fatalities. The primary goal of imaging the trauma patient is to quickly and accurately identify treatable lesions before secondary injury to the brain occurs. CT scan is ideally suited to evaluate patients immediately after trauma. Head injur...

Introduction: One of the main steps in the optimization process in diagnostic imaging is the quality control of radiology devices. The usual method of CT scan calibration is used of a phantom. The phantom created a certain weakening for the radiation through which it passes. One of the most suitable methods for quantitative analysis of the resolution and contrast in CT scan im...

Dehghani, N, Mehdizadeh , F, Sobhani , A,

ABSTRACT Trauma is the most common reason of death in 1-44 years olds. In patients with multiple rtrauma, the head is the most common involved part . Car accident is the most common cause of head injury in adults. The importance of computed tomography (CT) in diagnosis of brain trauma is well estabilished and CT of the brain is a choice method. A descriptive study was carried out in 880 patie...

B Shishesaz, K Ashrafi , R Nafisi-Moghadam ,

Abstract Background Computed tomography (CT)-guided biopsy of the lung is a well-established method of diagnosis. The aim of this study was to determine the success rate of fluoroscopic CT (FCT) and conventional CT (CCT) in needle navigation biopsies from the lung lesions. Materials and Methods A total of 78 patients were prospectively enrolled to receive CT-guided biopsy with (group I, n=2...

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