Signal analysis of impulse response functions in MR and CT measurements of cerebral blood flow

Rost, Evelyn; Geske, Ralf; Baake, Michael

doi:10.1016/j.jtbi.2005.10.005

Cited by 5 publications

(3 citation statements)

References 8 publications

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“…It has, however, been pointed out that simultaneous modelling of both the arterial and the tissue concentration curves by gamma densities is theoretically inappropriate [100]. Benner et al [101] investigated the accuracy of gamma-variate fits for different SNRs, temporal resolutions and maximum signal drops.…”

Section: Recirculationmentioning

confidence: 99%

Absolute quantification of perfusion using dynamic susceptibility contrast MRI: pitfalls and possibilities

Knutsson

Ståhlberg

Wirestam

2009

Magn Reson Mater Phy

104

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Absolute quantification of cerebral blood flow, cerebral blood volume and mean transit time is desirable in the determination of tissue viability thresholds and tissue at risk in acute ischaemic stroke, as well as in cases where a global reduction in cerebral blood flow is expected, for example, in patients with dementia or depressive disorders. Absolute values are also useful when comparing sequential examinations of tissue perfusion parameters, for example, in the monitoring and follow-up of various kinds of therapy. Regardless of the method employed, a number of assumptions and approximations must be made to obtain absolute measures of perfusion. Furthermore, the different stages of data acquisition and processing are associated with various degrees of uncertainty. In this review, the problems of particular relevance to absolute quantification of cerebral perfusion parameters using dynamic susceptibility contrast magnetic resonance imaging are discussed, and possible solutions are outlined.

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Section: Recirculationmentioning

confidence: 99%

Absolute quantification of perfusion using dynamic susceptibility contrast MRI: pitfalls and possibilities

Knutsson

Ståhlberg

Wirestam

2009

Magn Reson Mater Phy

104

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“…An input may be single or multiple, perfect or noisy, as well as an output may be. The areas of application of these models are quite different, varying from civil engineering (Engberg and Larsen 1995, Chapter 9), (Ren, Zhao and Harik 2004), (Spiridonakos and Chatzi 2014), communications and networks (Demir and Sangiovanni-Vintcentelli 1998, Sections 2.3-2.5), signal and image processing (Camps-Valls, Rojo-Álvarez, and Martínez-Ramón 2007), (Ogunfumni 2007, Chapters 3-5), (Gao et al 2014), (Prabhu 2014, Chapters 7-9), system identification and control (Söderström and Stoica 1988, Chapters 5-9), (Sjöberg et al 1995), (Chen, Ohlsson and Ljung 2012), applications to biology (Rost, Geske and Baake 2006) and finance (Hatemi-J 2012(Hatemi-J , 2014. Either in parametric of non-parametric framework, the above mentioned models use the feature of any linear system to be uniquely identified by means of the impulse response function (IRF).…”

Section: Introductionmentioning

confidence: 99%

On cross-correlogram IRF’s estimators of two-output systems in spaces of continuous functions

Blazhievska

Zaiats

2020

Communications in Statistics - Theory and Methods

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In this paper, single input-double output (SIDO) linear time-invariant (LTI) systems are studied. Both components of system's impulse response function (IRF) are supposed to be real-valued and L2-integrable. One component is unknown while the second one is controlled. The problem is to estimate the unknown component after observations of the other component. For this purpose, we apply cross-correlating of the outputs given that the input is a standard Wiener process on R. Weak asymptotic normality of appropriately centred estimators in spaces of continuous functions is proved. This enables us to construct confidence intervals in these spaces. Our results employ techniques related to Gaussian processes and bilinear forms of Gaussian processes.

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“…The impulse response analysis is widely used in studying engineering structures, hydrology, biology, acoustics, and so on. [19][20][21][22][23][24] For instance, Volkmer et al 25 provided the impulse response function to study the physiological flows. Todorovska and Trifunac 26 analyzed wave travel times from impulse response functions to detect earthquake damage.…”

Section: Introductionmentioning

confidence: 99%

Attenuation of pulsations in the reciprocating compressor piping system with an elbow-shaped surge tank

Yang

2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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An elbow-shaped surge tank is proposed to suppress the pressure pulsations. The transfer matrix method was developed and the mathematical model was established to predict the distribution of pressure pulsations in the piping system (on which a surge tank was already installed) with an elbow-shaped surge tank. Simulation work of the whole piping system was performed. The results show that the elbow-shaped surge tank has good performance to attenuate the pressure pulsations. The frequency analysis shows that the amplitude for the first pulsation frequency is attenuated to a low level. The impulse response was analyzed to examine the efficiency of suppressing pulsations by using the suppressor. The theoretical analysis showed that there exists the optimal suppression performance when setting the distance between the elbow-shaped surge tank and the existing one. Meanwhile, modifying the ratio of length to diameter with a fixed surge volume could also impact the pressure pulsations. The analysis results can be used as a reference in designing and installing the elbow-shaped surge tank.

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Signal analysis of impulse response functions in MR and CT measurements of cerebral blood flow

Cited by 5 publications

References 8 publications

Absolute quantification of perfusion using dynamic susceptibility contrast MRI: pitfalls and possibilities

Absolute quantification of perfusion using dynamic susceptibility contrast MRI: pitfalls and possibilities

On cross-correlogram IRF’s estimators of two-output systems in spaces of continuous functions

Attenuation of pulsations in the reciprocating compressor piping system with an elbow-shaped surge tank

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