MRIaggr-constCompressMRIaggr: Compress a MRIaggr object

In bozenne/MRIaggr: Management, Display, and Processing of Medical Imaging Data

Description

Generate from an existing MRIaggr object a new one with lower spatial resolution.

Usage

## S4 method for signature 'MRIaggr'
constCompressMRIaggr(object, compression.factor, param = NULL,
         mask = NULL, threshold = 0.49, verbose = optionsMRIaggr("verbose"))

Arguments

object	an object of class MRIaggr. REQUIRED.
compression.factor	the compression factor. postive integer. REQUIRED.
param	the contrast parameters to load in the new MRIaggr object. character vector or NULL.
mask	the binary contrast parameter(s). character vector.
threshold	the value above which the local mean of the binary parameters is assigned to 1 (and otherwise to 0). numeric between 0 and 1.
verbose	should the execution of the function be traced ? logical.

Details

ARGUMENTS:
Information about the param argument can be found in the details section of initParameter.

FUNCTION:
The fonction uses a local mean to compress the initial parameters maps to a lower resolution.

Value

a MRIaggr object.

Examples

## load a MRIaggr object
data("MRIaggr.Pat1_red", package = "MRIaggr")
 
## compress the MRIaggr object
MRIaggr.compressed <- constCompressMRIaggr(MRIaggr.Pat1_red, compression.factor = 2,
                                           param = c("DWI_t0","T2_FLAIR_t2","MASK_T2_FLAIR_t2"),
                                           mask = "MASK_T2_FLAIR_t2") 

## display
par(mfrow = c(2,4), mar = rep(1.75,4), mgp = c(2,0.75,0))
multiplot(MRIaggr.Pat1_red, param = "DWI_t0", window = NULL, breaks = seq(0,350,1),
             midplane = TRUE, main = "before - slice ")
multiplot(MRIaggr.compressed, param = "DWI_t0", window = NULL, breaks = seq(0,350,1),
             midplane = TRUE, main = "after - slice ")

multiplot(MRIaggr.Pat1_red, param = "MASK_T2_FLAIR_t2", main = "before - slice ")
multiplot(MRIaggr.compressed, param = "MASK_T2_FLAIR_t2", main = "after - slice ")

bozenne/MRIaggr documentation built on May 13, 2019, 1:39 a.m.