Fast Calculation of T-2 Relaxation Time in Magnetic Resonance Imaging

Kód výsledku v IS VaVaI

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Nalezeny alternativní kódy

RIV/00216305:26220/14:PU110561

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Fast Calculation of T-2 Relaxation Time in Magnetic Resonance Imaging

Popis výsledku v původním jazyce

The main parameters displayed by means of magnetic resonance include, for example, relaxation times T-1 and T-2 or diffusion parameters. This paper presents the computation of relaxation time T-2 measured indirectly with the Spin Echo method. The sensing coil of the tomograph provides a signal in which the important factor is the location of the peaks from individual measurements. These points must be interleaved with an exponential function. The relaxation time T-2 can be directly determined from the exponential shape. The described process has to be repeated for each pixel of the sensed tissue, and this requirement makes the processing of larger images very demanding in terms of both the actual computation and the time needed for the entire operation. More concretely, if we assume the common resolution of 256x256, 20 slices, and five measurements with different times TE, it is necessary to reconstruct 1.3.106 exponential functions in total, which requires the processing of more than 6MB of data. At present, such computation lasts approximately 3 minutes if performed by means of a regular PC. The author discusses various approaches to the parallelization of the given problem. In the described context, the time required for the processing of the applied three-dimensional image was shortened to 300 ms thanks to simple interpolation approach. The final section of the paper comprises a detailed comparison of the computation times characterizing both the sequential and the parallel solutions.

Název v anglickém jazyce

Fast Calculation of T-2 Relaxation Time in Magnetic Resonance Imaging

Popis výsledku anglicky

The main parameters displayed by means of magnetic resonance include, for example, relaxation times T-1 and T-2 or diffusion parameters. This paper presents the computation of relaxation time T-2 measured indirectly with the Spin Echo method. The sensing coil of the tomograph provides a signal in which the important factor is the location of the peaks from individual measurements. These points must be interleaved with an exponential function. The relaxation time T-2 can be directly determined from the exponential shape. The described process has to be repeated for each pixel of the sensed tissue, and this requirement makes the processing of larger images very demanding in terms of both the actual computation and the time needed for the entire operation. More concretely, if we assume the common resolution of 256x256, 20 slices, and five measurements with different times TE, it is necessary to reconstruct 1.3.106 exponential functions in total, which requires the processing of more than 6MB of data. At present, such computation lasts approximately 3 minutes if performed by means of a regular PC. The author discusses various approaches to the parallelization of the given problem. In the described context, the time required for the processing of the applied three-dimensional image was shortened to 300 ms thanks to simple interpolation approach. The final section of the paper comprises a detailed comparison of the computation times characterizing both the sequential and the parallel solutions.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20201 - Electrical and electronic engineering

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

PIERS 2014 Guangzhou Proceedings

ISBN

978-1-934142-28-8

ISSN

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e-ISSN

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Počet stran výsledku

5

Strana od-do

2331-2335

Název nakladatele

The Electromagnetics Academy

Místo vydání

Cambridge

Místo konání akce

Guangzhou

Datum konání akce

25. 8. 2014

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000393225900517