Browse Prior Art Database

Intensity Mapping of Medical Image Using Multiple Window Levels

IP.com Disclosure Number: IPCOM000105540D
Original Publication Date: 1993-Aug-01
Included in the Prior Art Database: 2005-Mar-20
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Takemura, T: AUTHOR

Abstract

Disclosed is a method of digital medical image intensity mapping for the multiple intensity ranges, which are called 'Windows' and specified at the modality station to show the contrast range of the interest for a modality picture. Normally, a single window is used to map the full gray scale, but this method can handle the multiple windows.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 92% of the total text.

Intensity Mapping of Medical Image Using Multiple Window Levels

      Disclosed is a method of digital medical image intensity
mapping for the multiple intensity ranges, which are called 'Windows'
and specified at the modality station to show the contrast range of
the interest for a modality picture.  Normally, a single window is
used to map the full gray scale, but this method can handle the
multiple windows.

      The Figure shows a sample intensity mapping.  This intensity
mapping is generated from 4 window levels.  In this figure, W1, W2,
W3, and W4 represent inputted window levels.  G1 is the largest pixel
value allowed by the input precision.  G2 is the largest pixel value
allowed by the target precision.

      The disclosed method handles two or more overlapping window
levels as one independent window level.  In the figure, overlapping
windows (W2 and W3) are handled as one window level.

      The disclosed method generates the same gradient slopes for
each window and generates the flat plateau line to connect each edge
of the slopes and maps to the full scale output gray level.  The
gradient slope is calculated as follows;

     G2 / Sum of windows widths

      The mapping starts from the lowest intensity level among the
windows (ex.  left edge of W1 of Figure) and ends up at the highest
intensity level among windows.  (ex.  right edge of W4 of the Figure)

      In accordance with the disclosed method, only inputted pixel
va...