PDA

View Full Version : more on 3D comparison



Marco Viceconti
02-07-1995, 06:48 PM
I've recently posted the following question:

>we are developing some new methods to generate accurate CT-scan reconstruction
>starting from a small number of slices. The major problem we are facing is
>the following:
>as a test of our algorithms, we have a cadaver specimen scanned at every mm.
>We sub-sample this data set using our method and we generate another 3D data
>set by interpolation.
>Question: How can we compare to three-D data set possibly obtaining a
>synthetic parameter of the overall error?
>I understand that this question could be equally placed in some news group;
>unfortunately, I've not news access >right now. So, if somebody would like to
>forward the question to other groups I'd be glad.

Some colleagues gave me answers but many others asked for clarification.
Let's try again:

The two data sets are taken from the same object in the same position with
the same Scanner;
both are formed by the same number of slices (let's say 1 mm steps)
obtained by interpolation of the real data set;
the only difference is the original data set, which can contain more or
less slices, positioned at different levels.

Hope this will sound more clear. Sorry

Marco



-----------------------------------------------------------------------------
MARCO VICECONTI
(lk1boq74@icineca.cineca.it)
Laboratorio di Tecnologia dei Materiali
tel. 39-51-6366865
Istituti Ortopedici Rizzoli
fax. 39-51-6366863
via di barbiano 1/10, 40136 - Bologna, Italy

Tiger! Tiger! Burning bright in the forest of the night,
what immortal hand or eye could frame thy fearful symmetry?
----------------------------------------------------------------------------
The opinions expressed here do not necessarly reflect those of my employer