نتایج جستجو برای: Micro Scan Image

تعداد نتایج: 555984  

Journal: :iranian journal of oil & gas science and technology 2013
sadegh mahmoudi abdonabi hashemi shahin kord

this work is a primary achievement in studying the co2 and n2–oil systems. to predict gas-liquid relative permeability curves, a shan-chen type multicomponent multiphase lattice boltzmann model for two-phase flow through 2d porous media is developed. periodic and bounce back boundary conditions are applied to the model with the guo scheme for the external body force (i.e., the pressure gradient...

Journal: :acta medica iranica 0
ghanaati h sharafi aa soroush h

ct image quality has been affected by many factors such as kvp, ma, exposure time, alogorithm and section thickness. gantry tilt has the main role in visualization of the temporal bone anatomic structures. in this study, we tried to optimize these factors to determine the best gantry tilt. this study was performed on the human skull phantom and then extended to 15 patients. the phantom was made...

Journal: :Medical physics 2004
Seung Wook Lee Ge Wang

Currently, cone-beam computerized tomography (CT) and micro-CT scanners are under rapid development for major biomedical applications. Half-scan cone-beam image reconstruction algorithms assume only part of a scanning turn, and are advantageous in terms of temporal resolution and image artifacts. While the existing half-scan cone-beam algorithms are in the Feldkamp framework, we have published ...

Journal: :Investigative ophthalmology & visual science 2004
Lelia A Paunescu Joel S Schuman Lori Lyn Price Paul C Stark Siobahn Beaton Hiroshi Ishikawa Gadi Wollstein James G Fujimoto

PURPOSE The measurement reproducibility of the third generation of commercial optical coherence tomography, OCT-3 (StratusOCT, software ver. A2, Carl Zeiss Meditec Inc., Dublin, CA) was investigated. The nerve fiber layer (NFL) thickness, macula thickness map, and optic nerve head (ONH) parameters in normal eyes were studied. METHODS Ten normal subjects were imaged six times (three before and...

Introduction: Nowadays applying computer in image processing is being improved revolutionary for solving medical images deficiencies. Image features that are analysis in image processing show image information. The aim of the present study was to find correlation between CT- scan and MRI images' features. Materials and Methods: After data acquisition, applying...

Journal: :Bio-medical materials and engineering 2014
Jian Fu Guangyuan Yu Dekai Fan

X-ray phase contrast computed tomography (CT) uses the phase shift that x-rays undergo when passing through matter, rather than their attenuation, as the imaging signal and may provide better image quality in soft-tissue and biomedical materials with low atomic number. Here a geometry-constraint-scan imaging technique for in-line phase contrast micro-CT is reported. It consists of two circular-...

Journal: :Optics Letters 2021

We report on Mid-infrared (MIR) OCT at 4 $\mu$m based collinear sum-frequency upconversion and promote the A-scan scan rate to 3 kHz. demonstrate increased imaging speed for two spectral realizations, one providing an axial resolution of 8.6 $\mu$m, a record 5.8 $\mu$m. Image performance is evaluated by sub-surface micro-mapping plastic glove real-time monitoring CO$_2$ in parallel with imaging.

Journal: :Medical physics 2003
Seung Wook Lee Ge Wang

Modern CT and micro-CT scanners are rapidly moving from fan-beam toward cone-beam geometry. Half-scan CT algorithms are advantageous in terms of temporal resolution, and widely used in fan-beam and cone-beam geometry. While existing half-scan algorithms for cone-beam CT are in the Feldkamp framework, in this paper we compensate missing data explicitly in the Grangeat framework, and formulate a ...

Ansari , Amir , Honarvar , F., Mahboobipour , Vahid ,

 The results of ultrasonic tests are usually displayed as A-scan signals. In an A-scan signal, reflections of ultrasonic wave form different reflectors are shown as sharp echoes on a time by amplitude display. Interpretation of these echoes can sometimes be quite difficult and usually requires knowledgeable and experienced specialists. There exist other methods of displaying the ultrasonic test...

Journal: :IOP conference series 2023

Abstract In a conventional single-energy X-ray imaging technique, the information obtained from examined object are often not sufficient for precise characterization. Hence, this study was designed to assess whether dual-energy technique would be good alternative method and can used improve output image. An electronic microcontroller chosen as sample due its complex inner structure. It scanned ...

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