[3DEM] number of required images

Masahide Kikkawa Masahide.Kikkawa at utsouthwestern.edu
Thu Mar 2 08:48:56 PST 2006


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Hi Leandro,

   Intuitively, isn't it just dividing the circumference of specimen 
by resolution?

   You can also describe it using the Fourier-Bessel transform, but it 
will be overkill..

>Does anybody know from where the formula below is derived?
>
>N = pi * D / d
>
>where N is the number of required images in order to make a 
>reconstruction with diameter D at resolution d.
>
>Many people cite Crowther's Nature paper (1970) but that formula 
>does not appear therein.

-- 
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Masahide Kikkawa, M.D., Ph. D.
Assistant Professor, Department of Cell Biology
University of Texas, Southwestern Medical Center
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