getsdofsb

getsdofsb-methods

getsdofsb,ANY-method

getsdofsb,dtiData-method

Estimate the noise standard deviation. Uses an assumption that the standard deviation
 is a linear function of the expected mean for image intensities. <code>qA0</code> and <code>qA1</code> define quantiles of observed image intensities that define the range of values where this assumption is made.

methods

 manip 

Diffusion Weighted Imaging (DWI) is a Magnetic Resonance Imaging
modality, that measures diffusion of water in tissues like the human
brain. The package contains R-functions to process diffusion-weighted
data. The functionality includes diffusion tensor imaging (DTI),
diffusion kurtosis imaging (DKI), modeling for high angular resolution
diffusion weighted imaging (HARDI) using Q-ball-reconstruction and
tensor mixture models, several methods for structural adaptive
smoothing including POAS and msPOAS, and a streamline fiber tracking
for tensor and tensor mixture models.
The package provides functionality to manipulate and visualize results
in 2D and 3D.

Karsten Tabelow

Analysis of Diffusion Weighted Imaging (DWI) Data

Joerg Polzehl

Felix Anker

getsdofsb-methods function

<dl> <dt>object</dt>
<dd>Object of class <code>"dtiData"</code></dd> <dt>qA0</dt>
<dd>level for lower quantile of image intensities</dd> <dt>qA1</dt>
<dd>level for upper quantile of image intensities</dd> <dt>nsb</dt>
<dd>number of diffusion weighted image to use</dd> <dt>level</dt>
<dd>level for mask</dd></dl>

Arguments

<dl><dt><code>signature(object) = "ANY"</code></dt>
<dd>Returns a warning.</dd>
<dt><code>signature(object) = "dtiData"</code></dt>
<dd>Returns a <code>dtiData</code> object with estimated standard deviation parameters in 
slot <code>sdcoef</code>.</dd>
</dl>

Methods

Karsten Tabelow <a href="/link/tabelow%40wias-berlin.de?package=dti&version=1.5.4.3" data-mini-rdoc="dti::tabelow@wias-berlin.de">tabelow@wias-berlin.de</a> 
 J\"org Polzehl <a href="/link/polzehl%40wias-berlin.de?package=dti&version=1.5.4.3" data-mini-rdoc="dti::polzehl@wias-berlin.de">polzehl@wias-berlin.de</a>

Author

Estimate the noise standard deviation — getsdofsb-methods

<dl>

 <dt>object</dt>
<dd>Object of class <code>"dtiData"</code></dd>

 <dt>qA0</dt>
<dd>level for lower quantile of image intensities</dd>

 <dt>qA1</dt>
<dd>level for upper quantile of image intensities</dd>

 <dt>nsb</dt>
<dd>number of diffusion weighted image to use</dd>

 <dt>level</dt>
<dd>level for mask</dd>

</dl>

<dl>

<dt><code>signature(object) = "ANY"</code></dt>
<dd>Returns a warning.</dd>


<dt><code>signature(object) = "dtiData"</code></dt>
<dd>Returns a <code>dtiData</code> object with estimated standard deviation parameters in 
slot <code>sdcoef</code>.</dd>


</dl>

Karsten Tabelow <a href='mailto:tabelow@wias-berlin.de'>tabelow@wias-berlin.de</a> 
 J\"org Polzehl <a href='mailto:polzehl@wias-berlin.de'>polzehl@wias-berlin.de</a>

getsdofsb-methods: Estimate the noise standard deviation

Description

Usage

Value

Arguments

Methods

Author

See Also