<code latex>
\documentclass{article}
\usepackage[pdftex,active,tightpage]{preview}
\usepackage{tikz}
	\usetikzlibrary{patterns}
\PreviewEnvironment{tikzpicture}
\begin{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%	
\def\radius{1}
\def\ticklength{.3}
\def\labelshift{0.35}
\def\overlap{.075}
\def\projangle{17}
\def\angleshift{2}
\begin{tikzpicture}[scale=1.6]
	\scriptsize
	%% Fill CenterScan
		\pattern [pattern=checkerboard light gray] (1,0) -- (3,0) arc (0:180:3*\radius) -- (-1,0) arc (180:0:\radius);
		\fill [color=red,nearly transparent] (1,0) -- (3,0) arc (0:180:3*\radius) -- (-1+\overlap,0) arc (180:0:\radius-\overlap);
	%% Fill RingScan 1
		\fill [color=green,nearly transparent] (0,0) circle (\radius+\overlap);
	%% Fill RingScan 2
		\pattern [pattern=horizontal lines gray] (1,0) -- (3,0) arc (0:-180:3*\radius) -- (-1,0) arc (-180:0:\radius);
		\fill [color=blue,nearly transparent] (1,0) -- (3,0) arc (0:-180:3*\radius) -- (-1+\overlap,0) arc (-180:0:\radius-\overlap);
	%% Projections		
		\draw [ultra thick,color=red](\projangle:\radius-\overlap) -- (\projangle:3*\radius);
		\draw [ultra thick,color=green](\projangle+180+\angleshift:\radius+\overlap) -- (\projangle+\angleshift:\radius+\overlap);
		\draw [ultra thick,color=blue](\projangle+180:3*\radius) -- (\projangle+180:\radius-\overlap);
	%% inner ring
		% ring
			\draw (0,0) circle (\radius);
		% projections
			\foreach \angle in {0,20,...,181}
				\draw (\angle:-\radius) -- (\angle:\radius+\ticklength);
			\foreach \angle in 	{0,5,...,179}
			{
		% inner ticks
				\draw (\angle:-.5*\ticklength) -- (\angle:.5*\ticklength);
%		% median ticks
%				\draw [dotted] (\angle:.5*\ticklength) -- (\angle:\radius-.5*\ticklength);					
%				\draw [dotted] (180+\angle:.5*\ticklength) -- (180+\angle:\radius);					
		% outer ticks
				\draw (\angle:\radius-.5*\ticklength) -- (\angle:\radius);
			}	
		% labels
			\foreach \angle / \label in {0/1,30/200,60/500,90/750,120/1000,150/1250,180/1500}
		 		\draw (\angle:\radius-\labelshift) node {\label}; % {\textsf{\label}};
	%% outer ring			
		% circle
			\draw (0,0) circle (3*\radius);
		% projections
			\foreach \angle in {0,20,...,719}
				\draw (.5*\angle:\radius) -- (.5*\angle:3*\radius+\ticklength);
			\foreach \angle in 	{0,2.5,...,359}
			{
		% inner ticks
				\draw (\angle:3*\radius-.5*\ticklength) -- (\angle:3*\radius+.5*\ticklength);
%		% median ticks
%				\draw [dotted] (\angle:\radius+.5*\ticklength) -- (\angle:3*\radius-.5*\ticklength);
		% outer ticks
				\draw (\angle:\radius) -- (\angle:\radius+.5*\ticklength);
			}	
		% labels
			\foreach \angle / \label in {2/1 and,15/200,30/500,45/750,60/1000,75/1250,90/1500,105/1750,120/2000,135/2250,150/2500,165/2750,178/3000}
			 	\draw (\angle:3*\radius+\labelshift) node {\label};
			\foreach \angle / \label in {2/and 1,15/200,30/500,45/750,60/1000,75/1250,90/1500,105/1750,120/2000,135/2250,150/2500,165/2750,178/3000}
			 		\draw (180+\angle:3*\radius+\labelshift) node {\label};
	\end{tikzpicture}%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%	
\end{document}
</code>