bin.erosion: Binary volume erosion

In espadon: Easy Study of Patient DICOM Data in Oncology

Binary volume erosion

Description

The bin.erosion function decreases a "volume" class object, of "binary" modality, by means of convolution with a sphere. Erosion is useful for :

• removing volumes that are smaller than the radius,

• eliminating narrow capes,

• enlarging channels,

• turning peninsulas into islands.

Usage

bin.erosion(vol, radius = 10, alias = "", description = NULL)

Arguments

vol	"volume" class object, of "binary" modality
radius	Positive number, or xyz-vector of 3 positive numbers. By default, radius = 10.
alias	Character string, $object.alias of the created object.
description	Character string, describing the created object. If description = NULL (default value), it will be set to paste (vol$object.alias, "erosion r =", radius).

Value

Returns a "volume" class object of "binary" modality (see espadon.class for class definitions), with the same grid as vol, in which the selected volume has been reduced by the radius.

See Also

bin.dilation, bin.opening, bin.closing, add.margin, nesting.cube.

Examples

# loading of toy-patient objects (decrease dxyz for better result)
step <- 4
patient <- toy.load.patient (modality = "mr", roi.name = "", 
                             dxyz = rep (step, 3))
MR <- patient$mr[[1]]

# generation of a binary volume
b <- bin.from.vol(MR, min = 15,max = 30)

b.erosion <- bin.erosion (b, radius = step)
display.plane (bottom = MR, top = b, main = "Before erosion", 
               view.coord = -20, interpolate = FALSE)
display.plane (bottom = MR, top = b.erosion, main = "After erosion", 
               view.coord = -20, interpolate = FALSE)

espadon documentation built on April 11, 2025, 5:57 p.m.