[ Identification | Description | Input parameters | Links ]

The Tomography Instrument

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

Identification

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

Description

Instrument to study tomographic imaging by means of the 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
geometry	string	Name of the OFF file describing the sample shape	"socket.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 (angular height)	1e-4
div_h	deg	Source horisontal divergence (angular width)	1e-4
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	Monitor_nD options string	"x bins=80 y bins=40"

Links

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

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[ Identification | Description | Input parameters | Links ]

Generated for mcstas 3.5.32

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Last Modified: Monday, 30-Jun-2025 11:05:10 CEST