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Volume Visualization Data Sets

by WebSysAdmin last modified 2013-01-09 13:35

The Chapel Hill Volume Rendering Test Data Set, Volume I

These were originally on an ftp site at the University of North Carolina, Chapel Hill.

SoftLab Software Systems Laboratory
University of North Carolina
Department of Computer Science
Chapel Hill, NC 27599-3175


The Chapel Hill Volume Rendering Test Data Set, Volume I is a collection of the following files:

Head data (zip file of 9.2 mbytes)
A 109-slice MRI data set of a human head. Complete slices are stored consecutively as a 256 x 256 array. Pixels consist of 2 consecutive bytes making one binary integer. Data taken on the Siemens Magnetom and provided courtesy of Siemens Medical Systems, Inc., Iselin, NJ.

Head data information article - An ASCII file containing acknowledgements for the head data files.

Knee data (zip file of 12.2 mbytes)
A 127-slice MRI data set of a human knee. Complete slices are stored consecutively as a 256 x 256 array. Pixels consist of 2 consecutive bytes making one binary integer. Data taken on the Siemens Magnetom and provided courtesy of Siemens Medical Systems, Inc., Iselin, NJ.

Knee data information article - An ASCII file containing acknowledgements for the knee data files.

CT Cadaver Head data (zip file of 7.4 mbytes)
A 113-slice MRI data set of a CT study of a cadaver head. Slices are stored consecutively as a 256 x 256 array with dimensions of z-113 y-256 x-256 in z-y-x order. Format is 16-bit integers -- two consecutive bytes make up one binary integer. 14,811,136 bytes total file size. Data taken on the General Electric CT Scanner and provided courtesy of North Carolina Memorial Hospital.

CT Cadaver Head data information article - An ascii file containing acknowledgements for the CT cadaver head data files.

MR Brain data (zip file of 7.9 mbytes)
A 109-slice MRI data set of a head with skull partially removed to reveal brain. 256 x 256 array. with dimensions of Z=109 Y=256 X=256 in z-y-x order. Format is 16-bit integers -- two consecutive bytes make up one binary integer. 14,286,848 bytes total file size. Data taken on the Siemens Magnetom and provided courtesy of Siemens Medical Systems, Inc., Iselin, NJ. Data edited  (skull removed) by Dr. Julian Rosenman, North Carolina Memorial Hospital.

MR Brain data information article - An ascii file containing acknowledgements for the MR brain data files.


The data sets were written on a Digital Equipment Corporation (DEC) VAX computer. Each file contains only pixels, stored in row major order with 2-byte integers per pixel. To use the images on machines that have normal byte order (DECs use reverse byte order), you should swap alternate bytes, for example using the 'dd' command in UNIX. A sample command that does this for the 3dknee data set is:

% dd if=3dknee of=3dknee.new conv=swab

We do not object to your further distributing these files, but we request that full acknowledgement of the source of the data accompany such distribution. If you are going to send a data set to someone, please also send the accompanying information file (*.info) and this file (Announcement).

The Computer Science Department, University of North Carolina only distributes these files by anonymous FTP.

We do not provide any software for displaying these data.

There is no information available about the data provided here other than that present in these files. For example, missing information about the means of data collection cannot be provided.


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