filter4dModeling the Imaging System#. We’ll model two different imaging systems here: an idealized imaging system, and a true SPECT imaging system. We’ll show that filtered back projectionフェノールレッド liquid, 0.5%, sterile-filtered, BioReagent, suitable for cell culture; CAS Number: 143-74-8; Synonyms: Phenolsulfonphthalein solution at Sma-Aldrich