Comput. Biol. Med. - Fast generation of T2* maps in the entire range of clinical interest: application to thalassemia major patients.

Tópicos

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Resumo

T2* maps obtained by the processing of multiecho MR sequences can be useful in several clinical applications. T2* map generation procedures should join a processing time compatible with on-line image analysis with a good precision in the entire T2* range of clinical interest. Fast generation of T2* maps can be achieved by the estimation of the T2* values by the weighted linear fitting of the logarithm of the signal (WLSL) method. This approach fails if the signal decay diverges from a pure exponential decay, as happens at low T2* values where the rapid decay in the signal intensity leads to a plateau in the later echo times (TE). The proposed method implements the automatic truncation of the signal decay curves to be fitted in order to compensate for the signal collapse at low T2* values, allowing the extension of the WLSL method through the entire clinical range of T2* values. Validation was performed on synthetic images and on 60 thalassemia major patients with different levels of myocardial iron overload. Phantom experiments showed that a 5% fitting error threshold represented the best compromise between T2* value measurement precision and processing time. A good agreement was found between T2* map pixel-wise measurements and ROI-based measurements performed by expert readers (CoV=1.84% in global heart T2*, CoV=5.8% in segmental analysis). In conclusion, the developed procedure was effective in generating correct T2* maps for the entire T2* clinical range.

Resumo Limpo

t map obtain process multiecho mr sequenc can use sever clinic applic t map generat procedur join process time compat onlin imag analysi good precis entir t rang clinic interest fast generat t map can achiev estim t valu weight linear fit logarithm signal wlsl method approach fail signal decay diverg pure exponenti decay happen low t valu rapid decay signal intens lead plateau later echo time te propos method implement automat truncat signal decay curv fit order compens signal collaps low t valu allow extens wlsl method entir clinic rang t valu valid perform synthet imag thalassemia major patient differ level myocardi iron overload phantom experi show fit error threshold repres best compromis t valu measur precis process time good agreement found t map pixelwis measur roibas measur perform expert reader cov global heart t cov segment analysi conclus develop procedur effect generat correct t map entir t clinic rang

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