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CT image of lungs and heart 31655 Medical Imaging Systems
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DTU Teaching Center for Fast
Ultrasound Imaging
Field II JAJ

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The Shepp-Logan phantom


The development of reconstruction algorithms is greatly eased by using standard phantoms with know properties. A well known example is the Shepp-Logan phantom containing ellipsis with different absorption properties, that resembles the outline of a head. An image of the phantom is shown below (click on the image to see the full version).

Shepp-Logan phantom

A Matlab function has been made, that can generate projection data for this phantom. The file shepp_logan.m can be found at the ftp-server in the directory:

https://courses.healthtech.dtu.dk/22485/files/ct_programs/shepp_logan.m

It is possible to generate images of different sizes and vary the number of projections generated. Instruction are found by writing help shepp_logan at the Matlab prompt.

The ideal Shepp-Logan phantom image can be generated using the command shepp_logan_image.m. Instruction are found by writing help shepp_logan_image at the Matlab prompt. An ideal Shepp-Logan phantom image can also be found at (Note: 2 Mbyte file): https://courses.healthtech.dtu.dk/22485/files/ct_programs//files/ct_programs/ideal_shepp_logan_image.mat.


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Last updated: 8:32 on Thu, 22-Oct-2020