title: Cardiac phase: amplitude analysis using macro programming.
abstract: The analysis of EKG gated radionuclide cardiac imaging data with Fourier amplitude and phase images is becoming a valuable clinical technique, demonstrating location, size, and severity of regional ventricular abnormalities. Not all commercially available nuclear medicine computer systems offer software for phase and amplitude analysis; however, many systems do have the capability of linear image arithmetic using simple macro commands which can easily by sequenced into stored macro-strings or programs. Using simple but accurate series approximations for the Fourier operations, macro programs have been written for a Digital Equipment Corporation Gamma-11 system to obtain phase and amplitude images from routine gated cardiac studies. In addition, dynamic cine-mode presentation of the onset of mechanical systole is generated from the phase data, using only a second set of macro programs. This approach is easily adapted to different data acquisition protocols, and can be used on any system with macro commands for image arithmetic.
mesh_terms: D003201:Computers; D004562:Electrocardiography / Q000379:methods*; D005583:Fourier Analysis; D006352:Heart Ventricles / Q000000981:diagnostic imaging*; D006439:Hemodynamics; D006801:Humans; D009200:Myocardial Contraction; D011877:Radionuclide Imaging