Advances in the rapid chemical synthesis of radiopharmaceuticals now permit a large number of labeled compounds to be used in positron imaging. Above all, there has been phenomenal growth in PET instrumentation research and development in recent years; a few system designs are potentially capable of...
The general-purpose x-ray tube is an electronic vacuum tube that consists of an anode, a cathode, and an induction motor all encased in a glass or metal enclosure (envelope). Figure 5-3 provides a labeled illustration of this design. Recall that the anode is the positive end of the ...
For this reason, under-table x-ray tubes produce less scattered radiation at the level of head and neck of the personnel than over-table x-ray tubes. Additional approaches to reduce staff doses are time, distance, and shielding: staying as far away from the patient as possible and keeping...
For PET, the radionuclide-labeled substance is injected into the person’s vein. The substances take about 30 to 60 minutes to reach the area being evaluated. The person lies on a narrow, padded table that slides into the PET scanner, and the table is positioned so that area being evalua...
The X-ray tube of this high-resolution CT scanner is a state-of-the-art open-type device with dual head: one head for high power micro-CT and ... BC Masschaele,V Cnudde,M Dierick,... - 《Nuclear Inst & Methods in Physics Research A》 被引量: 260发表: 2007年 UGCT: New x-...
The X-ray tube housing comprises an inner envelope made from Pyrex glass, which protects the tube and creates a vacuum around the tube to prevent corrosion and oxidation. This glass envelope has a target window through which the X-rays can travel, thinning the glass envelope. Surrounding the ...
Time resolved x-ray diffraction studies on stretch activated insect flight muscle J. Mus. Res. Cell Motil., 12 (1991), pp. 208-215 View in ScopusGoogle Scholar Reedy et al., 1992 M.K. Reedy, C. Lucaveche, N. Naber, R. Cooke Insect crossbridges, relaxed by spin-labeled nucleotide,...
FIGS. 5A-5C are outputs of computer simulations showing trajectories and accelerations of model devices according to the present invention. The outputs illustrate three exemplary paths, labeled “B”, “T” and “C” for bottom, top and center, respectively. As shown on FIG. 1, these correspon...
Combined image (Z1-2,φ1) is labeled to indicate that it corresponds to the first phase of the periodic motion. The label also indicates that image (Z1-2,φ1) represents the first portion and the second portion of body 15 as positioned during the first phase of motion. A correlation...
In FIG. 5, the x-axis, labeled “Collimator Hole” represents the position of the scanning beam over subsequent apertures in collimation grid90; it could also be viewed as a temporal axis, where the units of time are equal to the dwell time for a single aperture. The y-axis indicates ...