نتایج جستجو برای: phantom ct mtf phantom autocad modulation

تعداد نتایج: 300098  

Journal: :trauma monthly 0
mohammad h ebrahimzadeh department of orthopedic surgery, ghaem hospital, mashhad university of medical science, mashhad, ir iran amir r kachooei department of orthopedic surgery, ghaem hospital, mashhad university of medical science, mashhad, ir iran ali moradi department of orthopedic surgery, ghaem hospital, mashhad university of medical science, mashhad, ir iran h azema janbazan medical and engineering research center, tehran, ir iran

background long-term clinical symptoms and functional status of above-knee amputees are not well documented. this study documents the long-term outcomes of war related above-knee amputations. objective to study the long-term outcomes of unilateral above-knee amputation. materials and methods the study consisted of a comprehensive assessment, examination, and review of history and wartime medica...

2007
George Starkschall Neil Desai Peter Balter Karl Prado Dershan Luo Dianna Cody Tinsu Pan

The purpose of the present work was to describe the development and validation of a series of tests to assess the quality of four-dimensional (4D) computed-tomography (CT) imaging as it is applied to radiation treatment planning. Using a commercial respiratory motion phantom and a programmable moving platform with a CT phantom, we acquired 4D CT datasets on two commercial multislice helical CT ...

ژورنال: سنجش و ایمنی پرتو 2014

Due to the increasing proliferation of radiotherapy centers in the country to treat cancer patients and raise the quality of treatment, it is needed to find the human equivalent phantom for dosimetry, calibration and quality control of radiotherapy devices. Generally, they are enumerated into two categories: homogeneous and nonhomogeneous phantoms (anthropomorphic). The main purpose of this stu...

Journal: :Physics in medicine and biology 2005
C B Chiarot J H Siewerdsen T Haycocks D J Moseley D A Jaffray

Development, characterization, and quality assurance of advanced x-ray imaging technologies require phantoms that are quantitative and well suited to such modalities. This note reports on the design, construction, and use of an innovative phantom developed for advanced imaging technologies (e.g., multi-detector CT and the numerous applications of flat-panel detectors in dual-energy imaging, tom...

Journal: :iranian journal of medical physics 0
fatemeh lotfalizadeh department of ray-medical engineering, shiraz university, shiraz, iran mehrnoosh karimipourfard department of ray-medical engineering, shiraz university, shiraz, iran bentolhoda amanat department of physics, payame noor university, tehran, iran mehdi zehtabian department of ray-medical engineering, shiraz university, shiraz, iran

introduction based on task group no. 43 (tg-43u1) recommendations, water phantom is proposed as a reference phantom for the dosimetry of brachytherapy sources. the experimental determination of tg-43 parameters is usually performed in water-equivalent solid phantoms. the purpose of this study was to determine the conversion factors for equalizing solid phantoms to water. materials and methods t...

1997
Alan Liu Elizabeth Bullitt Stephen M. Pizer

We present a new method of intraoperative, image-based surgical instrument guidance. The method has the potential to significantly improve visualization of intraoperative procedures that currently depend on fluoroscopic images for navigation. 3D information from preoperative computed tomography (CT) is fused with images of the instrument taken intraoperatively. Our approach employs synthesized ...

Journal: :Physical Review Materials 2023

We investigate the effect of spatial doping Mott insulator ${\mathrm{LaVO}}_{3}$ by inserting a few layers correlated metal ${\mathrm{SrVO}}_{3}$ in multilayer geometries. Using DFT combination with DMFT, we demonstrate that this leads to geometrically confined and robust metallic layer stabilizes metallicity even ultrathin limit, suppressing potential dimensionality-induced metal-insulator tra...

Journal: :Medical Physics 2021

The fastCAT application uses pre-calculated Monte Carlo (MC) CBCT phantom-specific scatter and detector response functions to reduce simulation time for megavoltage (MV) kilovoltage (kV) imaging. Pre-calculated x-ray beam energy spectra, optical spread deposition, phantom kernels are combined with GPU raytracing produce volumes. MV spectra simulated EGSnrc 2.5 6 MeV electron beams incident on a...

Journal: :Jurnal Pembelajaran Fisika 2022

CT-Scan adalah salah satu modalitas untuk diagnosis utama, kualitas citra dari sangat berpengaruh terhadap diagnosis. Untuk menguji diperlukan suatu alat ukur berupa phantom. Penelitian ini bertujuan menganalisa penggunaan phantom Quart DVT-AP nilai resolusi spasial dan slice thickness pada 128 Slice 16 Slice. Uji dilakukan dengan menggunakan perhitungan digital. Phantom dipindai melakukan vari...

2002
Matheus Machado de Carvalho Ricardo M. Czekster Isabel Harb Manssour

The visualization of medical images, e.g. Computed Tomography (CT) and Magnetic Resonance Imaging (MRI), and the utilization of measurement tools to define distances, areas and volumes are very important to health professionals. The quantitative analysis of spatial relations among structures is useful for medical diagnosis. This work describes a visualization system that provides interactive me...

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