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The Walsh-Hadamard Transform: An Alternative Means of Obstaining Phase and Amplitude Maps

Ospedale San Giovanni, and University of Turin, Italy

Correspondence: For reprints contact: Dr. Piero Morello, Cattedra di Medicina Nucleare, C/so Polonia 14, 10100 Torino, Italy.

ABSTRACT

Currently, Fourier analysis is a method for obtaining the phase and amplitude images used to evaluate abnormalities of cardia contraction. Since this technique is time-consuming, the present work investigates the application of another algorithm used in digital signal processing: the Walsh-Hadamard transform (WHT). This method provides a 48% time saving because it requires only elementary algebraic operations. The study presents the results obtained processing 30 blood-pool cardiac acquisitions in various diseases. No significant difference was found in the pairs of maps and in the parameters chosen for comparison of the data.