Ultrasound RF Data Set heart

RF Data Format Description
The ultrasound RF data in this data set was collected using a complete set synthetic aperture focusing technique (SAFT). The firing sequence is described below (assuming a N element array):

  Record number:
     1  2  3  4 ... N   N+1  N+2 ...   N^2   
  Transmit element number:
     1  1  1  1 ... 1   2    2   ...   N
  Receive element number:
     1  2  3  4 ... 1   2    3   ...   N

The heart data is NOT on a linear scale. To use heart.dat, use the C function remap.c to map the values in the file to the actual files. The function creates a variable called iremap. Then, when reading the data, use the variable iremap to re-map the data to a linear scale.
For instance, if we read one piece of data into a variable called temp, then we map it by

in_data=iremap[temp]

Before using the function remap, you need to allocate an array of length 1024 floats and send that array in as the input to the function.

Data Files
The data files associated with this data set are:

heart.dat.gz : RF data file (Compressed using gzip)
heart.prm : Parameter file
This file contains characteristcs about the RF data
e.g., A/D sampling rate, transducer center frequency
heart.img : Sample image (raw format)
This is a sample reconstructed image from the data set. It is a 512x512 pixel image in raw binary format, i.e. 1 byte per pixel (256 grayscale levels) with no formatting or colormap.
heart.gif : Sample image (GIF format)
This is the same image as in the .img file, but in GIF format.
Please note that these images have no gamma correction in their colormap. Also these are the same images that can be seen by clicking on the small image icons. They are best viewed with an external viewer (e.g., xv) since some browsers (e.g., Netscape) dither the images and thus reduce image quality.