نتایج جستجو برای: subtraction technique

تعداد نتایج: 620977  

Journal: :Medical physics 2006
Ming De Lin Ehsan Samei Cristian T Badea Terry T Yoshizumi G Allan Johnson

The increasing use of small animals in basic research has spurred interest in new imaging methodologies. Digital subtraction angiography (DSA) offers a particularly appealing approach to functional imaging in the small animal. This study examines the optimal x-ray, molybdenum (Mo) or tungsten (W) target sources, and technique to produce the highest quality small animal functional subtraction an...

2014
Gebremichael T. Tesfamariam

Landmine problem is enormous and worldwide. Impulse ground penetrating radar (ImGPR) is one of the technologies that have been extensively researched as a means of improving landmine detection efficiency. We propose two methods to detect buried landmines. Both methods are based on background subtraction techniques to detect buried plastic landmines. The first method uses adaptive background est...

Journal: :Nihon Hoshasen Gijutsu Gakkai zasshi 2013
Aiko Sugimoto Shigehiko Katsuragawa Yoshikazu Uchiyama Junji Shiraishi

A temporal subtraction image, which is obtained by subtraction of a previous image from a current one, can enhance interval changes on a chest radiograph by removal of most normal structures. However, subtraction artifacts, which tend to reduce its effectiveness in the detection of interval changes, were still included in the conventional method. In this study, we have developed a pixel matchin...

Journal: :Int. J. Fuzzy Logic and Intelligent Systems 2012
Takumi Tokisa Noriaki Miyake Shinya Maeda Hyoungseop Kim Joo Kooi Tan Seiji Ishikawa Seiichi Murakami Takatoshi Aoki

The temporal subtraction technique as one of computer aided diagnosis has been introduced in medical fields to enhance the interval changes such as formation of new lesions and changes in existing abnormalities on deference image. With the temporal subtraction technique radiologists can easily detect lung nodules on visual screening. Until now, two-dimensional temporal subtraction imaging techn...

2013
S. S. S. Ranjit

This paper presents a study on image pixels using block positioning pixel subtraction technique to analyse the changes that occur in that region of interest. The changes that happen in the pixels represent the motion translation. Processing a whole video sequence in order to view a certain area of interest will increase the computational and processing time. In order to avoid this situation, th...

2012
Tahmineh Razi Arezu Mohammadi Morteza Ghojazadeh

BACKGROUND AND AIMS In periapical radiographic technique, the changes will be visible only after considerable deposi-tion or resorption while digital subtraction technique visualizes slight density changes. This study was aimed to compare visualization of density changes in conventional periapical radiographs and digital subtraction technique with or without image enhancement. MATERIALS AND M...

2013
Stanislas Rapacchi Fei Han Yutaka Natsuaki Randall M Kroeker Adam N Plotnik Evan Lehrman James Sayre Gerhard Laub J Paul Finn Peng Hu

PURPOSE We propose a compressed-sensing (CS) technique based on magnitude image subtraction for high spatial and temporal resolution dynamic contrast-enhanced MR angiography (CE-MRA). METHODS Our technique integrates the magnitude difference image into the CS reconstruction to promote subtraction sparsity. Fully sampled Cartesian 3D CE-MRA datasets from 6 volunteers were retrospectively under...

Journal: :Radiology 2001
E H Meijering W J Niessen J Bakker A J van Der Molen G A de Kort R T Lo W P Mali M A Viergever

The performance of an automatic technique for the reduction of patient motion artifacts in digital subtraction angiography was evaluated. Four observers assessed the quality of 104 cerebral digital subtraction angiographic images that were processed by means of both the automatic technique and manual pixel shifting. The automatic technique resulted in better image quality and was considerably l...

2003
Yuki DENDA Takanobu NISHIURA Hideki KAWAHARA

It is very important to capture distant-talking speech with high quality for teleconferencing systems or voice-controlled systems. For this purpose, microphone array steering and Fourier spectral subtraction, for example, are ideal candidates. A combination technique using both microphone array steering and Fourier spectral subtraction has also been proposed to improve performance. However, it ...

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