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- Joëlle K. Barral, Erik Gudmundson, Nikola Stikov, Maryam Etezadi-Amoli, Petre Stoica, Dwight G. Nishimura
- Magnetic resonance in medicine
- 2010

In this article, a robust methodology for in vivo T(1) mapping is presented. The approach combines a gold standard scanning procedure with a novel fitting procedure. Fitting complex data to a five-parameter model ensures accuracy and precision of the T(1) estimation. A reduced-dimension nonlinear least squares method is proposed. This method turns the… (More)

- Erik Gudmundson, Petre Stoica, +4 authors Jun Ling
- Journal of magnetic resonance
- 2010

The problem of estimating the spectral content of exponentially decaying signals from a set of irregularly sampled data is of considerable interest in several applications, for example in various forms of radio frequency spectroscopy. In this paper, we propose a new nonparametric iterative adaptive approach that provides a solution to this estimation… (More)

- Erik Gudmundson, Niclas Sandgren, Petre Stoica
- 2006 IEEE International Conference on Acoustics…
- 2006

Thresholding the cepstrum associated with the periodogram is a smoothing technique that appears to be very useful for variance reduction. Here the thresholding is performed via the methods SThresh and EbayesThresh. They both work fine in the broadband spectra case, even if some of the data is missing. The SThresh method appears to be more efficient as it… (More)

- Erik Gudmundson, Andreas Jakobsson, Jørgen A. Jensen, Petre Stoica
- Signal Processing
- 2011

This paper proposes two novel iterative data-adaptive spectral estimation techniques for blood velocity estimation using medical ultrasound scanners. The techniques make no assumption on the sampling pattern of the emissions or the depth samples, allowing for duplex mode transmissions where B-mode images are interleaved with the Doppler emissions.… (More)

- Samuel Dilshan Somasundaram, Andreas Jakobsson, Erik Gudmundson
- IEEE Transactions on Signal Processing
- 2008

Nuclear quadrupole resonance (NQR) is a solid-state radio frequency spectroscopic technique that can be used to detect compounds which contain quadrupolar nuclei, a requirement fulfilled by many high explosives and narcotics. Unfortunately, the low signal-to-noise ratio (SNR) of the observed signals currently inhibits the widespread use of the technique,… (More)

- Andreas Jakobsson, George-Othon Glentis, Erik Gudmundson
- IEEE Transactions on Signal Processing
- 2012

High-resolution spectral Doppler is an important and powerful noninvasive tool for estimation of velocities in blood vessels using medical ultrasound scanners. Such estimates are typically formed using an averaged periodogram technique, resulting in well-known limitations in the resulting spectral resolution. Recently, we have proposed techniques to instead… (More)

Nuclear quadrupole resonance (NQR) is a solid-state radio frequency spectroscopic technique that can be used to detect the presence of quadrupolar nuclei, that are prevalent in many narcotics, drugs, and explosive materials. Similar to other modern spectroscopic techniques, such as nuclear magnetic resonance, and Raman spectroscopy, NQR also relies heavily… (More)

- Erik Gudmundson, Andreas Jakobsson, Samuel Dilshan Somasundaram
- 2008 IEEE International Conference on Acoustics…
- 2008

The problem of estimating a spectral representation of damped sinusoidal signals from a gapped data set is of considerable interest in several applications. In this paper, we propose a filterbank approach to provide such an estimate, by first reconstructing the missing data samples assuming that the spectral content of the missing data is similar to that of… (More)

- M. Björk, R. Reeve Ingle, Erik Gudmundson, Petre Stoica, Dwight G. Nishimura, Joëlle K. Barral
- Magnetic resonance in medicine
- 2014

PURPOSE
The balanced steady-state free precession (bSSFP) pulse sequence has shown to be of great interest due to its high signal-to-noise ratio efficiency. However, bSSFP images often suffer from banding artifacts due to off-resonance effects, which we aim to minimize in this article.
METHODS
We present a general and fast two-step algorithm for 1)… (More)

- G. Kyriakidou, Andreas Jakobsson, Erik Gudmundson, A. Gregorovic, Jamie Barras, Kaspar Althoefer
- 2014 22nd European Signal Processing Conference…
- 2014

Nuclear Quadrupole Resonance (NQR) is a method of detection and unique characterization of compounds containing quadrupolar nuclei, commonly found in many forms of explosives, narcotics, and medicines. Typically, multi-pulse sequences are used to acquire the NQR signal, allowing the resulting signal to be well modeled as a sum of exponentially damped… (More)