Results 251 to 260 of about 357,990 (292)
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1987
X-ray computed tomography (CT) is remarkably helpful in the diagnosis of diseases of the upper abdominal organs, particularly the liver, biliary tract, and pancreas. However, CT examination has not been established as reliable pathognomonic method due to the rapid development of technique and equipment.
Sadayuki Sakuma +2 more
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X-ray computed tomography (CT) is remarkably helpful in the diagnosis of diseases of the upper abdominal organs, particularly the liver, biliary tract, and pancreas. However, CT examination has not been established as reliable pathognomonic method due to the rapid development of technique and equipment.
Sadayuki Sakuma +2 more
openaire +2 more sources
Ptychographic X-ray computed tomography at the nanoscale
Nature, 2010X-ray tomography is an invaluable tool in biomedical imaging. It can deliver the three-dimensional internal structure of entire organisms as well as that of single cells, and even gives access to quantitative information, crucially important both for medical applications and for basic research.
Martin Dierolf +7 more
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2017
This chapter provides an overview of the use of x-ray and computed tomography (CT)-based imaging for brachytherapy. Treatment planning in brachytherapy requires accurate imaging of both the implanted materials and the surrounding anatomy. Ultrasound (US) and magnetic resonance imaging (MRI), which can provide excellent soft-tissue contrast for ...
Michael J. Zelefsky, Martin T. King
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This chapter provides an overview of the use of x-ray and computed tomography (CT)-based imaging for brachytherapy. Treatment planning in brachytherapy requires accurate imaging of both the implanted materials and the surrounding anatomy. Ultrasound (US) and magnetic resonance imaging (MRI), which can provide excellent soft-tissue contrast for ...
Michael J. Zelefsky, Martin T. King
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1980
Matter is made of elementary particles consisting of a nucleus composed of protons and neutrons surrounded by electrons. The protons are hydrogen nuclei with a positive charge and their number determines the atomic number. The neutrons, which have no electric charge, form with the protons the nucleons which determine the atomic mass.
J. Saudinos, G. Salamon
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Matter is made of elementary particles consisting of a nucleus composed of protons and neutrons surrounded by electrons. The protons are hydrogen nuclei with a positive charge and their number determines the atomic number. The neutrons, which have no electric charge, form with the protons the nucleons which determine the atomic mass.
J. Saudinos, G. Salamon
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Dose in x-ray computed tomography
Physics in Medicine and Biology, 2014Radiation dose in x-ray computed tomography (CT) has become a topic of high interest due to the increasing numbers of CT examinations performed worldwide. This review aims to present an overview of current concepts for both scanner output metrics and for patient dosimetry and will comment on their strengths and weaknesses.
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Applied X-ray computed tomography
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1995Abstract The application of X-ray computed tomography (CT) for aircraft and aerospace structures and ancillary equipment has been investigated in the Advanced Development of X-Ray Computed Tomography Applications demonstration (CTAD) program sponsored by the NDE Branch of the Materials Directorate at the Air Force Wright Laboratory.
C.F. Buynak, R.H. Bossi
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X-Ray Angiography in the Computed Tomography [PDF]
, 1996 X-ray angiography had once been considered as the sole method to evaluate blood vessels, and also is an important examination for intracranial neoplasms. As computed tomography (CT) and magnetic resonance imaging (MRI) is used more extensively, the number of X-ray angiography has been reduced dramatically.
Zhu Mingwang, Dai Jian-ping
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X-Ray Imaging and Computed Tomography
2020Synopsis: In this chapter, the reader is introduced to the basic physics of x-rays and their implementation in planar and computed tomography (CT) imaging.
John A. Kennedy +3 more
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Accelerating X-ray fluorescence computed tomography
2009 Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2009This paper presents new approaches to accelerating X-ray fluorescence tomography (XFCT) that are grounded in both novel image acquisition strategies that improve the quality of the data acquired and in image reconstruction strategies that reduce the amount of data acquired.
Phillip Vargas +3 more
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X-Ray Computed Tomography of Ultralightweight Metals
Research in Nondestructive Evaluation, 1999In recent years several universities, government laboratories, and private industries have been developing specific process technologies, analytical modeling tools, and characterization methods for highly porous metals and alloys frequently collectively termed ``ultralightweight metals.'' The goal has been to achieve a family of metallic structures ...
J. M. Winter +3 more
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