projection question

Hi Folks,

I am a hospital physicist and I have been asked to build a projection system into one of our hospitals scanners. However, its been a good number of years since I have done any optics, so I am here for some help.

I have been asked to build a projection system similar to that described in this paper
(http://doi.wiley.com/10.1002/(SICI)1522-2586(200002)11:2%3C223::AID-JMRI22%3E3.0.CO;2-G)

Journal of Magnetic Resonance Imaging 11;223-227 (2000).

To summarise (and assuming that not everyone can dowload this or be bothered to read it!) I have a projector (with it's main lens removed) with a plano-convex lens placed in front of it at a distance D1, a mirror a distance from the lens D2 and the mirror a distance D3 from the mirror (the mirror is required to angle the projection into the scanner).

I want to keep the projected image to a specified size. How do I work out what focal length of lens is required and how far to place it from the projector knowing the distance from the projector to the screen (Dtotal)? I know that the projector has an LCD size of 1" (which I believe is the diagonal dimension?) which I assume is required for the calculation. I was also wondering, is the projector likely to have any internal lenses etc that might affect this calculation ,i.e. is one 1" LCD projector with lens removed the same as another, optically?

Thanks for any help!

Best regards

Dave Brennan

.

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