<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:st1="urn:schemas-microsoft-com:office:smarttags" xmlns="http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv=Content-Type content="text/html; charset=us-ascii"> <meta name=Generator content="Microsoft Word 11 (filtered medium)"> <o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="metricconverter"/> <o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="PersonName"/>  <style>  </style> </head> <body lang=PL link=blue vlink=purple> <div class=Section1> Hi Gaters.<o:p></o:p> <o:p> </o:p> Did anybody successfully used ring repeater with a 90 deg rotated trapezoid (trpd) shape, with the enableAutoRotation option?<o:p></o:p> <o:p> </o:p> I created trapezoid shape, moved it along x axis, rotated 90 deg along y axis. With this I have a pyramid pointing along x direction towards origin of the system. When I do a repeater (8 times, every 45 deg) with enableAutoRotation, the pyramid rotates around ITS z axis, and that axis is all the time pointing at the x direction of the world.<o:p></o:p> <o:p> </o:p> I observed the same behavior for box shape, when it is rotated as the trapezoid above.<o:p></o:p> <o:p> </o:p> /gate/PETscanner/daughters/insert trpd<o:p></o:p> /gate/trapezoid/geometry/setX1Length <st1:metricconverter ProductID="40 mm" w:st="on">40 mm</st1:metricconverter><o:p></o:p> /gate/trapezoid/geometry/setY1Length <st1:metricconverter ProductID="40 mm" w:st="on">40 mm</st1:metricconverter><o:p></o:p> /gate/trapezoid/geometry/setX2Length <st1:metricconverter ProductID="50 mm" w:st="on">50 mm</st1:metricconverter><o:p></o:p> /gate/trapezoid/geometry/setY2Length <st1:metricconverter ProductID="50 mm" w:st="on">50 mm</st1:metricconverter><o:p></o:p> /gate/trapezoid/geometry/setZLength <st1:metricconverter ProductID="9.8 mm" w:st="on">9.8 mm</st1:metricconverter><o:p></o:p> /gate/trapezoid/placement/setRotationAxis 0 1 0<o:p></o:p> /gate/trapezoid/placement/setRotationAngle 90 deg<o:p></o:p> /gate/trapezoid/placement/setTranslation 60.7 0. <st1:metricconverter ProductID="0. mm" w:st="on">0. mm</st1:metricconverter><o:p></o:p> #material is defined separately<o:p></o:p> <o:p> </o:p> /gate/trapezoid/repeaters/insert ring<o:p></o:p> /gate/trapezoid/ring/setPoint1 0. 0. <st1:metricconverter ProductID="1. mm" w:st="on">1. mm</st1:metricconverter><o:p></o:p> /gate/trapezoid/ring/setPoint2 0. 0. <st1:metricconverter ProductID="0. mm" w:st="on">0. mm</st1:metricconverter><o:p></o:p> # two above lines may be omi<st1:PersonName w:st="on">tt</st1:PersonName>ed, as z is default axis of rotation<o:p></o:p> /gate/trapezoid/ring/enableAutoRotation<o:p></o:p> /gate/trapezoid/ring/setRepeatNumber 8<o:p></o:p> <o:p> </o:p> /gate/systems/PETscanner/level1/a<st1:PersonName w:st="on">tt</st1:PersonName>ach trapezoid<o:p></o:p> <o:p> </o:p> /gate/trapezoid/a<st1:PersonName w:st="on">tt</st1:PersonName>achCrystalSD<o:p></o:p> <o:p> </o:p> Is anybody got something like that working reasonably well?<o:p></o:p> <o:p> </o:p> The solution I thought of is to insert manually (without repeater) 8 trapezoids. However I am not sure if 8 distinct shapes can work as one crystal sensitive detector? How can I merge them? <o:p></o:p> <o:p> </o:p> I would be obliged for any suggestion.<o:p></o:p> <o:p> </o:p> Best regards<o:p></o:p> <st1:PersonName ProductID="Marcin Balcerzyk" w:st="on">Marcin Balcerzyk</st1:PersonName><o:p></o:p> Universidad Complutense de Madrid.<o:p></o:p> </div> </body> </html>