Processed and un-processed contiguous axial MRI data of the lower leg obtained from 21-31 and 66-79 year old subjects

This dataset presents contiguous axial magnetic resonance imaging (MRI) data captured from the lower left legs of twelve 21-31 year old (young) and twelve 66-79 year old (old) healthy adult male and female participants.Data were collected using a General Electric 1.5T Signa EchoSpeed Plus MRI system, with the following parameters:- Phased-array coil<br>- T1-weighted spin echo sequence<br>- 4mm slice thickness<br>- 400ms repetition time<br>- 11ms echo time- 512 x 512 pixel resolution- 30cm field of view<br><br>Data are provided as MATLAB binary files produced from the raw DICOM files obtained from the MRI instrument. These files duplicate the DICOM image data but remove any identifying patient data to protect participant privacy. Each file contains a 512 x 512 x n_smatrix of 16-bit integers representing grayscale pixel intensities, where n_sis the number of slices.<br>Filenames are given in the format <b>XXN_MRI_Data_Combined.mat</b>, where <b>XX</b> is the group identifier (<b>OF</b>: old female; <b>OM</b>: old male; <b>YF</b>: young female; <b>YM</b>: young male) and <b>N</b> is the subject number (<b>1-6</b>).<br>Also provided are output files for each MATLAB binary processed with the software shared with this dataset (https://doi.org/10.6084/m9.figshare.7223357). These include muscle boundary identification, tissue segmentation, and cross-sectional area calculations. The naming format for these files is <b>XXN_MRI_Data_Combined_Output.mat</b>, using the conventions as above. Full details of the variables contained in these files can be found in <b>Output_Variables_Description.pdf</b>.