RMD has developed vapor-grown microcolumnar CsI:Tl, which has become the standard for diagnostic digital radiography. Microcolumnar film scintillators channel and conserve scintillation light within densely packaged, highly uniform microcolumns, thereby breaking the sensitivity versus spatial resolution trade-off seen in other scintillator materials such as GOS. The microcolumns are parallel, needle-like structures controllable in diameter from 250 nm to 10 μm. RMD fabricates structured CsI:Tl screens as large as 47×47 cm2 size, and has extensive experience in micro-columnar growth of high resolution screens.