Introduction: Polymer gel dosimeters contain chemical materials sensitive to the radiation which are polymerized by the radiation as a function of absorbed dose. So information of spatial dose distribution can be extracted by imaging from irradiated gel. Among imaging techniques, computed tomography (CT) poses as an attractive method because of practical advantages such as acce...

This article describes a quantitative evaluation of visualizing small vessels using several image reconstruction methods in computed tomography. Simulated vessels with diameters of 1-6 mm made by 3D printer was scanned using 320-row detector computed tomography (CT). Hybrid iterative reconstruction (hybrid IR) and model-based iterative reconstruction (MBIR) were performed for the image reconstr...

An optical system based on in-line digital holography for the evaluation of deformations is described. In-line holograms are recorded on a CCD chip. The problem of overlapping twin images typical for the in-line arrangement is solved by digital reconstruction and filtering of the unwanted wave fronts. Two separate interferograms of an object under test in its undeformed and deformed states are ...

Forward projectors are needed for iterative image reconstruction algorithms for CT or PET image reconstruction. The major cost of iterative reconstruction algorithms is computing the forward and backward projections. Conventionally, this is done in the image domain as computing the lengths of intersections between each X-ray ray and each image voxel. These operations are the major computational...

ground-based laser range finder have got more concerned. In our previous research, a method of automated In this paper, a method of fusing ground-based laser registration of two views of laser range image was range image and CCD image for the reconstruction of proposed [4,51, and showed promising results with some textured 3 0 urban object is proposed. An acquisition preliminary experiment. The...

OBJECTIVES To compare image quality on computed tomographic (CT) images acquired with filtered back-projection (FBP), adaptive statistical iterative reconstruction (ASIR) and model-based iterative reconstruction (MBIR) techniques in CT kidney/ureter/bladder (KUB) examination. METHODS Eighteen patients underwent standard protocol CT KUB at our institution. The same raw data were reconstructed ...

Kisner, Sherman J. Ph.D., Purdue University, December 2013. Image Reconstruction for X-ray Computed Tomography in Security Screening Applications. Major Professor: Charles A. Bouman. X-ray tomographic systems have increasingly widespread use in security screening applications. For example, most major airports now utilize X-ray CT systems for efficient screening of baggage and cargo. While decad...

This paper presents the basic concept of Camera-Augmented Mobile C-arm (CAMC) and a set of its possible applications. A C C D camera is attached to a mobile C-arm uoroscopy X-ray system. Both optical and X-ray imaging systems are calibrated in the same coordinate system in an oo-line process. The new system is able to provide X-ray and optical images simultaneously. This system was rst used for...