Naslov
Deconvolving out indicator smearing in the right ventricle facilitates left-to-right shunt quantitation

Autori
Eterović, Davor ; Dujić, Željko ; Popović, Slavko

Izvornik
European journal of nuclear medicine (0340-6997) 21 (1994), 6; 525-530

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Left-to-right shunt ; 1st-pass radioangiography ; Deconvolution

Sažetak
A simple algorithm is developed to enhance the resolution of components of multimodal pulmonary radiohistograms. Based on the assessed right ventricular ejection fraction (RVEF), it deconvolves out the effect of indicator smearing in the right ventricle on the heart rate samples of the pulmonary radiohistogram, c(k). The output is the ideal curve, c(k)'=c(k)/RVEF - (1- RVEF).c(k-1)/RVEF, that would be obtained if RVEF equalled unity. Since the formula is not a recursive one, it does not suffer from error propagation pertinent to numerical deconvolution. Once RVEF is known, implementation of the algorithm is simple. If RVEF is not known accurately it may be replaced with its upper estimate, RVEF(up)>RVEF, yielding a partial deconvolution of the curve. When applied to studies of patients with left-to-right shunt the method improves the accuracy and lessens the interobserver variation of the Maltz-Treves method.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Temeljne medicinske znanosti, Kliničke medicinske znanosti

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