نتایج جستجو برای: imaging tomography

تعداد نتایج: 588111  

PET (positron emission tomography) is a powerful imaging technique that can provide quantitative information on the distribution of positron emitter labeled radiopharmaceuticals (PET radiopharmaceuticals) in the body. Positrons (ß+) are positively charged beta particles. They are emitted when the atom is proton rich. A positron has only a transient existence. After losing all of its kinetic ene...

Journal: :Journal of biomedical optics 2014
Vesna Cuplov Iréne Buvat Frédéric Pain Sébastien Jan

The Geant4 Application for Emission Tomography (GATE) is an advanced open-source software dedicated to Monte-Carlo (MC) simulations in medical imaging involving photon transportation (Positron emission tomography, single photon emission computed tomography, computed tomography) and in particle therapy. In this work, we extend the GATE to support simulations of optical imaging, such as biolumine...

Journal: :Biomedical optics express 2017
Dongli Xu Weibin Zhou Leilei Peng

Fourier multiplexed FLIM (FmFLIM) tomography enables multiplexed 3D lifetime imaging of whole embryos. In our previous FmFLIM system, the spatial resolution was limited to 25 μm because of the trade-off between the spatial resolution and the imaging depth. In order to achieve cellular resolution imaging of thick specimens, we built a tomography system with dual-color Bessel beam. In combination...

2014
MR Dweck DE Newby

Atherosclerosis is dependent on a number of cellular processes from initial endothelial injury to sequestration of lipid in the subendothelial space and activation of immune cells. Risk factors for predicting the development of atherosclerosis are well established, as are the various imaging techniques available to assess the burden of atherosclerosis in patients with symptomatic disease. Howev...

Background: In general, radiotherapy treatment planning is performed using the virtual bolus. It is necessary to investigate physical bolus in comparison to virtual one. Objectives: In the present study, first, radiological properties of superflab Gel bolus and Paraffin wax bolus was investigated in terms of their relative electron density. Then, dosimetric performance of both the bolus (...

Introduction: Nowadays, magnetic resonance imaging (MRI) in combination with computed-tomography (CT) is increasingly being used in radiation therapy planning. MR and CT images are applied to determine the target volume and calculate dose distribution, respectively. Since the use of these two imaging modalities causes registration uncertainty and increases department w...

Journal: :Electronic Notes in Discrete Mathematics 2005
Giacomo Mauro D'Ariano Lorenzo Maccone

We present a method to perform tomographic imaging starting from very little data. The reconstruction of arbitrary images is performed using techniques mutuated from quantum state reconstruction. Almost maximal information gain from each datum is achieved, yielding a reduction in the radiation exposure of the imaged sample.

پایان نامه :وزارت بهداشت، درمان و آموزش پزشکی - دانشگاه علوم پزشکی و خدمات بهداشتی درمانی استان مرکزی 1380

چکیده ندارد.

2013
Ajay Somkuwar Shruti Bhargava

Noise is an inherent property of medical imaging, and it generally tends to reduce the image resolution and contrast, thereby reducing the diagnostic value of this imaging modality, there is an emergent attentiveness in using multi-resolution Wavelet filters in a variety of medical imaging applications. We Have review recent wavelet based denoising techniques for medical ultrasound, magnetic re...

Fateme Shahedi, Mehdi Jamali Mehdi Momennezhad, Shahrokh Naseri

Introduction: The application of 3D volumetric imaging modalities in treatment planning of radiation therapy can provide more precisely define tumor localization, and computed tomography (CT) is the most common accepted method for treatment planning. Given the lack of a CT scanner stationed in all radiotherapy departments and equipping most of the medical linear accelerators wi...

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