نتایج جستجو برای: computed tomography iterativeimage reconstruction

تعداد نتایج: 377600  

Arman Rahmim

This paper intends to compare the abilities of the two major imaging modalities in nuclear medicine imaging: Positron Emission Tomography (PET) and Single Photon Emission Computed Tomography (SPECT). The motivations are many-fold: (i) To gain a better understanding of the strengths and limitations of the two imaging modalities in the context of recent and ongoing developments in hardware ...

Journal: :Journal of radiology case reports 2013
Yee-Tak Alta Lai Yiu Shiobhon Luk Kai-Hung Fung

We describe a case of an incidentally-diagnosed ectopic tooth showing anomalous morphology in the maxillary antrum, using three-dimensional reconstruction of computed tomography images of the tooth obtained by multi-detector computed tomography.

2014
G Vijayalakshmi

Advances in computed tomography and availability of high performance computing in the last decade have shown importance of iterative reconstruction in combination with statistical methods. An attempt is made to compare two existing iterative methods used for reconstruction namely ART and SART. The results show that ART is a highly computational intensive and time taking process compared to SART...

Journal: :acta medica iranica 0
mohammad taghi khorsandi ashtiani department of otorhinolaryngology-head & neck surgery, amir alam educational hospital, tehran university of medical sciences, tehran, iran. nasrin yazdani department of otorhinolaryngology-head & neck surgery, amir alam educational hospital, tehran university of medical sciences, tehran, iran. masoome saeedi department of otorhinolaryngology-head & neck surgery, amir alam educational hospital, tehran university of medical sciences, tehran, iran. amin amali department of otorhinolaryngology-head & neck surgery, imam khomeini educational complex ,valiasr hospital, tehran university of medical sciences, tehran, iran.

fewer than 15% of lipomas occur in the head and neck. lipomas of the larynx are very rare benign laryngeal tumors (0.6%). to date less than 100 case of laryngeal lipoma have been reported in the literature.clinical manifestation include progressive horseness, dyspnea, and even dysphagia. in the direct exam smooth or pedunculated mass is seen in the larynx and sometimes if tumor is large enough ...

2016

In computed tomography (CT), an important objective is to reduce radiation dose without degrading image quality. The radiation exposure from CT scan will make severe problem in humans. This has high risk in the case of children and female. The higher exposure will lead to leukemia, cancer etc. So that low dose CT image reconstruction is the main concern now days. We have to reconstruct the imag...

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