Accuracy and density of pure tungsten collimators produced by additive manufacturing

摘要: 2165 Objectives Recently, additive manufacturing (AM) has been proposed as a novel technique to produce pure tungsten pinhole collimators. The AM process now refined and post processing is used obtain better definition of the apertures. Here we report on improvements in material density accuracy Methods A new complex multi-lofthole collimator designed Siemens NX. size 70 x 48.7 16.8 mm; it 20 oblique loftholes with an aperture diameter 500 μm. this have both entrance exit opening; due there true knife edge. This was produced by (Layerwise, Belgium). measured. mass measured precision balance; volume using Archimedes suspension method. production verified GOM ATOS II Triple Scan optical scanner. isoperimetric quotient (the circularity) apertures were microscopes (Nikon AZ 100M, Olympus IMT200). Results 18.56 +/- 0.08 g/cm.; 96.4% tungsten. mean deviation from software CAD design +35 maximum minimum deviations are +180 μm -137 μm, respectively. 509 457 542 μm). 0.77. Conclusions illustrates that made field objects. close overall greatly improved. These indicate potential for production. sufficiently high SPECT systems more designs like cone or fanbeam may be feasible. Research Support research funded EU FP7 project SUBLIMA (Grant Agreement No. 241711), IOF-Flanders iMinds. Roel Van Holen Foundation- Flanders (FWO, Belgium) Ghent University.