2 edition of Multiple on-axis fresnel zone plate imaging in nuclear medicine. found in the catalog.
Multiple on-axis fresnel zone plate imaging in nuclear medicine.
Written in English
|The Physical Object|
|Number of Pages||190|
Abstract Coded aperture imaging of X ray or y ray emitting objects using on-axis Fresnel zone plate apertures was the original method suggested by Mertz in Since then other forms of coded aperture imaging have become more popular. We show in this paper that, under certain well-defined conditions, high quality images can be obtained with. The application of a two dimensional (2D) grating interferometer–Fresnel zone plate combination for quantitative submicron phase contrast imaging is reported. The combination of the two optical elements allows quick recovery of the phase shift introduced by a sample in a hard X-ray beam, avoiding artifacts observed when using the one dimensional (1D) interferometer for a sample with features.
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In this work, we present a bifocal Fresnel zone plate (BiFZP) capable of generating focusing profiles with two different foci. The performance of the BiFZP is demonstrated in the ultrasound domain, with a very good agreement between the experimental measurements and the finite element method (FEM) simulations. This lens becomes an appealing alternative to other dual-focusing lenses, in which. A suitable circular absorbing or phase grating is called Fresnel zone plate (FZP) [Fre ]. A FZP focuses the incoming beam to a point focus (fig. 1). The minimum diameter of the focus reached is 15 nm for X-rays in There are also zone plates reflecting the incoming light. These types of Fresnel zone plates can be distinguished.
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Recently we have shown that the use of a Fresnel zone plate as a spatially-coded source or aperture can avoid this trade-off. In radiology, this technique can eliminate the need for a rotating anode and give higher resolution, while in nuclear medicine it can be used either to decrease patient dose or exposure time, or to increase resolution and greatly simplify the by: Recently, it has been shown that the use of a Fresnel zone plate as a spatially-coded source or aperture can avoid this trade-off.
In radiology, this technique can eliminate the need for a rotating anode and give higher resolution, while in nuclear medicine it can be used either to decrease patient dose or exposure time, or to increase resolution and greatly simplify the by: Nuclear Magnetic Resonance Nuclear Magnetic Resonance Signal Fresnel Zone Zone Plate Data Acquisition Time These keywords were added by machine and not by the authors.
This process is experimental and the keywords may be updated as the learning algorithm by: 4. The MDOE is synthesized by random multiplexing of two diffractive functions, namely a Fresnel zone plate 29 and a spiral Fresnel zone pl31,32 with different focal : Sruthy J. Lathika, Vijayakumar Anand, Vijayakumar Anand, Shanti Bhattacharya.
A major disadvantage to imaging (e.g. gamma rays) with Fresnel zone plates is the presence of the undiffracted (dc) light in the final image. This undesired light reduces the image contrast and is particularly serious when imaging large by: 1. In nuclear medicine imaging the Fresnel zone plate has been used with both optical  and digital  decoding.
Random pinhole masks have also been applied with optical processing . The difficulty with usin~ the above taeh, niques in nuclear medicine imaging is the overlap of information from plane to plane in the direction per- pendicular to the detector face.
Substantial improvements in the nanofabrication and characteristics of gold Fresnel zone plates yielded unprecedented resolution levels in hard-x-ray microscopy. Tests performed on a variety of specimens with 8 – 10 keV photons demonstrated a first-order lateral resolution below 40 nm based on the Rayleigh criterion.
Combined with the use of a phase contrast technique, this makes it possible. TOPICS: Zone plates, Coded apertures, Reticles, X-ray astronomy, Gamma ray imaging, Nuclear medicine, Halftones, Spatial filters Read Abstract + Mertz and Young introduced the idea of using a Fresnel zone plate as a shadow-casting reticle, or coded aperture, in X-ray astronomy.
RECONSTRUCTION OF THE FRESNELâ€"CODED GAMMA CAMERA IMAGES BY DIGITAL COMPUTER. aperture imaging with on-axis Fresnel zone plates jointly in consensus by nuclear medicine and diagnostic. A monochromatized x-ray beam is focused using an x-ray objective lens (a Fresnel zone plate in this case) onto a sample.
While the sample is raster-scanned, a full x-ray fluorescence spectrum is recorded for each pixel using an energy dispersive detector (Vortex-ME4, Hitachi High-Technologies Science America, USA) located at 90° with respect to the incident beam. A two-step autoradiographic imaging technique utilizing a coded aperture in the form of a lead on-axis Fresnel zone plate is presented.
Several isotope-filled plastic phantoms were successfully imaged. The use of a Fresnel zone plate as a coded aperture for imaging incoherent radiation such as gamma rays has been previously reported. The coded image is in many respects similar to a hologram and can be decoded or reconstructed with a coherent optical system.
In this paper, the general theory of coded-aperture imaging is presented, first for an arbitrary code and then for an on-axis zone plate. A Review of Coded Aperture Families having Perfect Mathematical Imaging Properties used for Near Field Imaging Application "Fresnel Zone Plate Imaging in Nuclear zone plate to -ray imaging.
Our experiment was conducted at Beamline 2-ID-B at the Advanced Photon Source 41 using an in vacuo imaging endstation 42 that permits a sample to be rotated and translated through a diverging beam formed via a Fresnel zone plate (FZP). We used a keV X-ray beam to coherently illuminate a μm FZP with nominal outer zone width of 30 nm.
Diagnostic nuclear medicine involves the use of radioactive tracers to image and/or measure the global or regional function of an organ. The radioactive tracer (radiopharmaceutical) is given to the patient by intravenous injection, orally or by other routes depending on the organ and the function to be studied.
The uptake, turnover and/or excretion of the tracer substance is. Receive the table of contents by email: [Sign up for eTOCs] Fresnel Zone Plate Imaging in Nuclear Medicine J Nucl Med Full Text (PDF) Book Review.
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Washington, D.C., General Nuclear Medicine Nuclear medicine imaging uses small amounts of radioactive materials called radiotracers that are typically injected into the bloodstream, inhaled or swallowed.
The radiotracer travels through the area being examined and gives off energy in the form of gamma rays which are detected by a special. Jaszczak, R.J., Moore, F.E., Whitehead, F.R. (), Use of an array of three off-axis zone plates for large field of view gamma-ray imaging, in Proceedings of the SPIE Seminar on Application of Optical Instrumentation in Medicine II, Chicago, The popular QUESTIONS AND ANSWERS IN MAGNETIC RESONANCE IMAGING is thoroughly revised and updated to reflect the latest advances in MRI technology.
Four new chapters explain recent developments in the field in the traditional question and short answer s: 8. Nuclear Medicine Resources Manual This manual provides comprehensive guidance, at the international level, on many aspects of nuclear medicine practice, including education, training, facilities and equipment, quality systems, and radiopharmacy and clinical practice.
It will be of use to those working in both new and more developed nuclear medicine. Radiology publishes cutting edge and impactful imaging research articles in radiology and medical imaging in order to help improve human health.
Previous. Next. VolumeIssue 1 / July Nuclear Medicine. Coded Aperture Imaging Using On-Axis Fresnel Zone Plates and Extended Gamma-Ray Sources. Mike D. Tipton, James E.
Dowdey.nuclear medicine. Upon completion, the technologist should be able to list the types of acquisition modes for nuclear medicine studies, choose the best acquisition mode for any given study, and perform studies using these acquisition modes.
Most nuclear medicine imaging systems present their infor mation as digital images.associated Fresnel zone plate qZP[ς,p(N,S)], with period (6) but with some missing clear zones (compare Fig.
1a with Fig. 1b). Figure 2 shows a FZP generated from a triadic Cantor set, up to S=3, and the corresponding Fresnel zone plate with period p(2,3).
Figure 2. Fresnel zone plate (a) and the associated FZP (b) generated from the 1-D.