NEWS.md

In mritc: MRI Tissue Classification

mritc 0.6.0

• Package dependencies have been simplified. The lattice and misc3d packages have become optional (Suggests) dependencies rather than required ones, and tkrplot is not directly connected at all. Visualisation can now be performed by RNifti (an existing dependency through oro.nifti), which has more easily met system requirements than misc3d.
• A suite of tests has been added to the package. tinytest and covr are now suggested dependencies for testing and code-coverage support.
• plot.mritc() gains a method argument for choosing the visualisation backend: the new default, "RNifti", uses RNifti::view() and requires only packages already needed elsewhere by mritc; the previous behaviour is still available via method="misc3d", which uses the Tk-based misc3d::slices3d() viewer and requires the misc3d and tkrplot packages to be installed.
• Added a verbose argument to mritc(), passed through to the underlying fitting methods, to allow progress messages to be suppressed.
• Fixed a bug where mritc(..., method="MCMCsubbias") used the wrong spatial neighbourhood construction (sub=FALSE instead of sub=TRUE), affecting results for that method.
• Fixed a bug in mritc.pvhmrfem() where argument checks on mu, sigma and err were not actually performed, which could lead to a downstream segfault for invalid inputs.
• Fixed a bug in writeMRI() involving incorrect vectorised use of ifelse(), which could fail for some input object types.
• Class labels are now assigned deterministically when tied (print.mritc(), summary.mritc(), plot.mritc() and measureMRI() all used max.col() without breaking ties consistently, which could change reported results from run to run).
• The package citation style has been updated to match current requirements.

mritc 0.5-3

• Jon Clayden took over as maintainer.
• Newly allocated variables are now protected in the C code, to prevent potential problems arising from garbage collection.
• Documentation URLs were updated to HTTPS.
• The LazyData field was dropped from the package DESCRIPTION.
• Long-running examples now use \donttest, as requested by CRAN.

mritc 0.5-2

• Maintainer contact details updated (metadata-only release).

mritc 0.5-1

• Fixed missing S3 method registrations and namespace imports.

mritc 0.5-0

• Added support for bias field correction, via a new "MCMCsubbias" method for mritc() and a new getWeightsMRI() function.
• Image file input and output (readMRI()/writeMRI()) now uses the oro.nifti package, rather than the previously used AnalyzeFMRI and fmri packages.

mritc 0.4-0

• The core computations were parallelised using OpenMP, for improved performance.

mritc 0.3-5

• tkrplot added as a suggested package dependency, required for the interactive 3D viewer used by plot.mritc() (thanks to Brian Ripley for reporting the missing dependency).
• Documented that the package supports normal mixture models with up to eight components (thanks to Matthew Moores).
• Updated the documentation for the plot.mritc(), print.mritc() and summary.mritc() methods to use standard \method{}{} markup (thanks to Achim Zeileis).

mritc 0.3-4

• Added a citation for the associated Journal of Statistical Software paper.

mritc 0.3-3

• measureMRI() now uses discrete (rather than fuzzy) classifications to calculate tissue volumes, simplifying the calculation of rseVolume.
• Changed the x-axis label of the density plot produced by measureMRI().

mritc 0.3-2

• Fixed a bug in checkErrors() affecting the comparison sum(prop)==1.
• Added new initProp() and initThresh() initialisation functions, alongside initOtsu().
• Increased the minimum required version of misc3d to 0.7-1, which fixed a crosshair display bug (thanks to Brandon Whitcher for testing and reporting the problem).

mritc 0.3-1

• Initial CRAN release.

mritc documentation built on July 25, 2026, 9:06 a.m.