[ Identification | Description | Input parameters | Output parameters | Links ]

# The `Tomography` Instrument

Instrument to study tomographic imaging by means of the new V_sample feature of OFF shape samples.

## Identification

- Site: Templates
- Author: Peter Willendrup, based on work by Reynald ARNERIN
- Origin: Risoe
- Date: June 20th, 2008
- Version: 1.4

## Description

    Instrument to study tomographic imaging by means of the new V_sample feature of OFF shape samples.

    Example: mcrun Tomography.instr offfile=bunny.off -n1e4 -N18 omega=0,340 -d TomoScan
    (Note that to achieve proper statistics for tomographic reconstruction, MUCH higher ncounts
     are needed)

    Use the provided Matlab tomo_recon.m function (requires imaging toolbox, PGPLOT output data
    and a Unix/Mac) in the tools/matlab folder to reconstruct a 3D volume of the object. Use e.g.
    isosurface to do thresholding for extraction of the object surface.

## Input parameters

Parameters in boldface are required; the others are optional.

Name | Unit | Description | Default
--- | --- | --- | ---
offfile | string | Name of the OFF file describing the sample shape | "bunny.off"
omega | deg | Sample rotation around y | 0
sigma_abs | barn | Sample absorption xs | 100
frac_scatt | 1 | Fraction of neutrons to scatter in the sample | 0
div_v | deg | Source vertical divergence | 0
div_h | deg | Source horisontal divergence | 0
source_w | m | Source width | 0.4
source_h | m | Source height | 0.2
det_w | m | Detector width | 0.4
det_h | m | Detector height | 0.2
opts | string | Detector Monitor_nD options | "x bins=80 y bins=40"

## Links

- Source code for `Tomography.instr`.
- http://shape.cs.princeton.edu/benchmark/documentation/off_format.html

[ Identification | Description | Input parameters | Output parameters | Links ]