For characterizing a heart condition

• US 4,637,400 A
• Filed: 08/13/1985
• Issued: 01/20/1987
• Est. Priority Date: 02/15/1985
• Status: Expired due to Fees

• Current Assignee: Edward N. Marcus
• Original Assignee: Edward N. Marcus
• Inventors: Marcus, Edward N.
• Primary Examiner(s): Howell, Kyle L.
• Assistant Examiner(s): Smith, Ruth S.
• Application Number:
  US06/765,373
• Time in Patent Office: 525 Days
• Field of Search: 128/630, 128/653, 128/695, 128/696, 128/713, 128/699
• US Class Current: 600/425
• CPC Class Codes: A61B 5/1075 for measuring dimensions by non-invasive methods, e.g. for determining thickness of tissue layer A61B8/0858 takes precedence
• CPC Class Codes: G06V 10/46 Descriptors for shape, contour or point-related descriptors, e.g. scale invariant feature transform [SIFT] or bags of words [BoW]; Salient regional features colour feature extraction G06V10/56

Abstract

A heart is medically imaged to provide outlines of the end systole, mid systole and end diastole images of the heart. There is provided for each outline a sequence of functional relationships for the normalized curvature of a point to the normalized distance along the outline from the apex of each outline to provide a normalized curvature distribution function for each outline that are differentially combined to provide a normalized curvature difference function that is displayed. The latter is compared with a normal average normalized curvature difference function representative of normal hearts to evaluate the heart condition.

Claims

1. A method of characterizing the condition of a heart which method includes the steps of,

medically imaging said heart to obtain the outline of the end diastole image as a first curve and the end systole outline image as a second curve,

determining the normalized curvature of a sequence of points along each of said curves over a predetermined pathlength as a function of the normalized distance of a respective point along said pathlength,

determining for each of said points the functional relationship of said normalized curvature to the normalized distance of the associated point along said pathlength to obtain first normalized curvature values of said first curve and second normalized curvature values of said second curve,

and differentially combining said first normalized curvature values and said second normalized curvature values at corresponding values of position along said pathlengths to provide a difference functional relationship representative of the difference in shape between said first and second curves,

said curves each defining a closed loop and each pathlength corresonding to a segment of a respective closed loop beginning and ending at predetermined reference points on said closed loops.

2. A method of characterizing the condition of a heart in accordance with claim 1 and further including the steps of providing a signal characteristic of said difference functional relationship for a normal heart for said end diastole image outline and said end systole image outline,

and comparing the latter signal with the difference functional relationship representative of the difference between first and second curves corresponding to the outlines of the end systole and end diastole images respectively of said heart.