title: [Time resolution of scintigraphically determined left ventricular volume curves (author's transl)].
abstract: In 25 patients with angiographically proven coronary heart disease and in 15 patients without heart disease, gated cardiac blood pool scintigraphy was done with 15 mCi 99mTc-HSA in LAO projection. Scintigraphic data were collected in list mode by means of a gamma camera connected to a computer system (Siemens 330). A cumulative scintigram scintigram sequence with a time resolution of 100, 50 and 25 frames/sec was constructed using several hundred heart cycles of equal duration. After background correction volume curves of the left ventricle with a time resolution of 25, 50 and 100 Hz were obtained and the following parameters of these curves were compaired: ejection fraction, maximum ejection rate and maximum filling rate. It could be demonstrated that smoothing by sliding average requires a time resolution of at least 50 Hz, whereas in volume curves smoothed by Fourier-Analysis a time resolution of only 25 Hz is necessary. However, using a time resolution of 25 Hz, the course of the volume curve can not always be clearly demonstrated, so that time resolution of 50 Hz combined with Fourier-Analysis for the gated cardiac blood pool scintigraphy is preferred.
mesh_terms: D002306:Cardiac Volume; D003327:Coronary Disease / Q000000981:diagnostic imaging; D005583:Fourier Analysis; D006321:Heart / Q000000981:diagnostic imaging*; D006334:Heart Function Tests / Q000379:methods; D006352:Heart Ventricles / Q000000981:diagnostic imaging; D006801:Humans; D011877:Radionuclide Imaging; D013667:Technetium; D013997:Time Factors
chemical_list: D013667:Technetium
vernacular_title: Nuklearmedizinisch bestimmte Volumenkurven des linken Ventrikels: Untersuchungen zur zeitlichen Auflösung.