{"id":88,"date":"2017-06-02T07:00:32","date_gmt":"2017-06-02T07:00:32","guid":{"rendered":"http:\/\/www.shalomeo.com\/blog\/?p=88"},"modified":"2017-06-02T07:00:32","modified_gmt":"2017-06-02T07:00:32","slug":"a-small-animal-pet-system-based-on-lyso-crystal-arrays","status":"publish","type":"post","link":"https:\/\/www.shalomeo.com\/blog\/a-small-animal-pet-system-based-on-lyso-crystal-arrays\/88.html","title":{"rendered":"A Small-Animal PET System Based on LYSO Crystal Arrays"},"content":{"rendered":"<p>A positron emission tomography system for small animals has been designed for research purposes, and developed at Instituto de Fisica, UNAM, Mexico. Its detection modules are based on pixelated scintillator <span style=\"color: #ff6600;\"><strong>LYSO crystal arrays<\/strong><\/span> coupled to Hamamatsu H8500 position-sensitive photomultiplier tubes.<\/p>\n<p>The front-end electronics are based on nuclear instrumentation modules (NIM) and in-house built readout circuits. Peak signal digitization is performed with a commercial analogue-to-digital acquisition (DAQ) board. The system has been characterized for spatial, timing and energy resolution, system dead time, absolute sensitivity, scatter fraction and noise equivalent count rate (NEC).<\/p>\n<p>The results indicate that the detection modules are able to identify individual crystals (out of 400) with up to 8-to-1 peak-to-valley ratios with individual crystal energy resolution ranging from 7 to 15% at 511 keV. The timing resolution is 1.9 ns and the system dead time was found to be 16.8 s and 42.1 s for 0.5 ml and 10 ml volume sources, respectively. The measured absolute system sensitivity is 0.11% and the scatter fraction from a glass capillary inside a 2.5 cm diameter mouse phantom is 21.5%. A true NEC maximum value was not achieved with the system due to saturation of the PS-PMT output signals for activities above 0.27 mCi. Results from a Na18 F PET bone scan of a 30 g mouse are shown.<\/p>\n<p style=\"color: #ff0000;\">This article comes from ieeexplore edit released<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A positron emission tomography system for small an &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[2],"tags":[24],"_links":{"self":[{"href":"https:\/\/www.shalomeo.com\/blog\/wp-json\/wp\/v2\/posts\/88"}],"collection":[{"href":"https:\/\/www.shalomeo.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.shalomeo.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.shalomeo.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.shalomeo.com\/blog\/wp-json\/wp\/v2\/comments?post=88"}],"version-history":[{"count":0,"href":"https:\/\/www.shalomeo.com\/blog\/wp-json\/wp\/v2\/posts\/88\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.shalomeo.com\/blog\/wp-json\/wp\/v2\/media?parent=88"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.shalomeo.com\/blog\/wp-json\/wp\/v2\/categories?post=88"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.shalomeo.com\/blog\/wp-json\/wp\/v2\/tags?post=88"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}