Scintigraphic study of ureteral peristalsis using fast Fourier transforms.
Pathophysiological changes in ureteral kinetics can be monitored externally and non-invasively by means of a time-space matrix approach during the excretory phase of fast-frame routine renography. The main limitations of this method are poor space-time resolution and, in some cases, an inadequate visualization of the peristaltic waves. A new approach to the study of ureteral contractions using the power spectrum obtained from Fourier transforms of the ureteral time-activity curves was developed. The FORTRAN program was tested by an experimental simulation, and its subsequent application on fifty-one subjects indicated that the method is a useful complement to the space-time matrix technique. Moreover, evaluation of the power spectrum offers several advantages for the study of the pathophysiological parameters of peristalsis.
Ropolo
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R
Servizio di Fisica Sanitaria, Ospedale Molinette, Turin, Italy.
Cesana
P
P
Picciotto
G
G
Sargiotto
A
A
De Filippi
P G
PG
D000293:Adolescent; D000328:Adult; D000368:Aged; D005583:Fourier Analysis; D006801:Humans; D008875:Middle Aged; D011866:Radioisotope Renography / Q000379:methods; D012984:Software; D017263:Technetium Tc 99m Mertiatide; D014513:Ureter / Q000000981:diagnostic imaging / Q000503:physiopathology*; D014515:Ureteral Diseases / Q000000981:diagnostic imaging / Q000503:physiopathology*
D017263:Technetium Tc 99m Mertiatide