Create VDWs Overview

Introduction

VDWs are normalized resampled diffusion weighted image files created from DMR files, comparable to VTCs of FMR files for functional data.  

For content-related questions about diffusion weighted data, please consult the DTI guide on the wiki at http://wiki.brainvoyager.com/DTI_in_BVQX .

Parameters

The table below indicated the parameters that can be used for the commands to create VDW files.

 

Description

Argument type

Values and type

Required for

 

 

 

 

Name of DMR file

String

"xxx.dmr"

Always

Name of initial alignment file

String

"*_IA.trf"

Always

Name of fine alignment file

String

"*_FA.trf"

Always

Name of AC-PC alignment file

String

"*_ACPC.trf"

Only for:

CreateVDWInACPCSpace()

CreateVDWInTALSpace()

Name of Talairach landmarks file

String

"*.tal"

Only for:

CreateVDWInTALSpace()

Name of resulting VDW file

String

"xxx.vdw"

Always

Resolution

Number

1 = 1 x 1 x 1

2 = 2 x 2 x 2

3 = 3 x 3 x 3

Always

Interpolation method

Number

0 = nearest neighbour

1 = trilinear

2 = SINC

Always

Bounding box intensity threshold  

Number

Between 0 and 225

Always

 

Although the argument type is indicated, variables always have to be declared with the keyword var; example:

 

var interpolationmethod = 2;

 

 

More information and examples

See the following topics:

 

Create VDW in native space

Create VDW in ACPC space

Create VDW in Talairach space