Arbeitsgruppe Phantome
Phantom group - Introduction

It is obvious that all sub-projects within the first major part of the FORBILD fund, as they deal with the improvement of CT imaging, will at least partly make use of simulated CT raw data. E.g. it is clear to see that new algorithms examined for project II.2. must be validated with precisely defined and well known input data. In a similar form this argument applies to all other projects of part I.

During the first 4 months since FORBILD's kickoff a team FORBILD by members of all concerned sub-projects developed a series of phantoms:

Contributions were made by members of the SIEMENS Medical System research department and of the IMP in Erlangen. In detail the following people were - more or less - concerned with the phantom design:

Dr. H. Bruder SIEMENS
Dr. T. Flohr  SIEMENS
Dr. T. Fuchs IMP
Dr. T. von der Haar    SIEMENS
Dr. M. Karolczak IMP
Dr. M. Kachelrieß IMP
Dr. G. Lauritsch SIEMENS
Dr. S. Schaller SIEMENS
Fr. U. Seibert IMP
Fr. K. Sourbelle IMP
Dr. K. Stierstorfer SIEMENS
Hr. O. Watzke IMP
Hr. P. Stenner IMP

(mail to phantom group)

Especially for the case of the semi-anthropomorphic phantoms our main goal was to supply a set of exactly defined geometrical objects that can be used by different teams working on various topics at different places with individual tools without sacrifying the comparability of results.

The results of the design sessions can be found in the following list:

Anthropomorphic Phantoms Physical Test Objects

Abdomen Phantom
Author: Stefan Schaller

Artifact Phantom
Author: Marc Kachelrieß

Head Phantom
Author: Günter Lauritsch and Herbert Bruder

High Contrast Resolution Phantom
Author: Theo Fuchs

Hip Phantom
Author: Oliver Watzke

Low Contrast Phantom
Author: Stefan Schaller

Jaw Phantom
Author: Oliver Watzke

Lung Phantom
Author: Marc Kachelrieß
Thorax Phantom
Author: Katia Sourbelle
Other
Noise Simulation
Author: Theo Fuchs
Micro–CT Mouse Phantom
Author: Philip Stenner

 

For each phantom we provide the description of the actual design and the respective file that contains the list and the descriptions of the geometric objects the phantom is designed from. The syntax of the phantom geometry description file can be understood easily and is adapted to the CT simulation tool CT_SIM developed by SIEMENS Medical Systems (proprietary software for internal use only).

In addition we provide instructions for the simulation of noise and a preliminary table of tissues of interest. For the noise as well for the densities and CT values of various human tissues the same arguments apply as mentioned above: In the first place we try to achieve comparability of the results of different working groups. We did not stress too much on the question, if the shapes of "organs", the structure of noise or the exact HU values of special tissues are perfectly realistic.