| 1. |
- Bergvall, Erik, et al.
(författare)
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Regularization of phase contrast magnetic resonance images using optical flow and smoothness constraints
- 2005
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Ingår i: Computers in Cardiology. - 0276-6574. ; 32, s. 33-36
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Konferensbidrag (refereegranskat)abstract
- This paper presents a post processing strategy for myocardial velocity fields obtained by phase contrast magnetic resonance imaging. Such data can be used to track cardiac motion and to calculate strain. The method combines data regularization with optical flow estimation to overcome the partial volume effect in the image acquisition. Validation is performed both in vitro and in vivo and it is shown that the method improves the accuracy of cardiac motion tracking.
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| 2. |
- Carlson, Jonas, et al.
(författare)
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Non-invasive assessment of direction of right atrial activation during atrial fibrillation using correlation function analysis.
- 2007
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Ingår i: Computers in Cardiology. - 0276-6574. ; 34, s. 277-280
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Tidskriftsartikel (refereegranskat)abstract
- ECGs were recorded from three electrodes attached at the corners of an equilateral triangle positioned around the location of electrode V1. The atrial signal between QRST complexes was subjected to correlation function analysis to reveal differences in activation times between the electrode sites. The time differences found were used to calculate the direction of activation across the body surface. Twenty-three subjects were studied during sinus rhythm (SR), intraoperatively confirmed typical and reverse typical atrial flutter, or during paroxysmal or permanent atrial fibrillation (AF). Subjects studied during SR and patients with typical atrial flutter exhibited a uniform direction of activation, with the main vector pointing downwards. The propagation of atrial activation during permanent AF did not show a consistent direction, while patients with paroxysmal AF exhibited more uniform activation vectors, corresponding to the direction observed in patients with atrial flutter.
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| 3. |
- Corino, Valentina D.A., et al.
(författare)
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A Mathematical Model of The Atrioventricular Node during Atrial Fibrillation
- 2010
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Ingår i: [Host publication title missing]. - 0276-6574. ; 37, s. 117-120
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Konferensbidrag (refereegranskat)abstract
- The atrioventricular (AV) node plays a crucial role during atrial fibrillation (AF). The aim of this study is to present an AV node model which can be fitted to short-term ECG recordings in order to infer certain AV node characteristics. The proposed model is characterized by: i) the arrival rate of atrial impulses; ii) two different refractory periods, corresponding to dual AV nodal paths; iii) the probability of an atrial impulse choosing either of these pathways; iv) a parameter modeling prolongation of the refractory period due to different physiological reasons. The model was tested on atrial fibrillatory ECGs recorded from 33 patients; the average normalized absolute error between the normalized RR histogram and the estimated model probability density function was 0.0023 ± 0.0016, (20-ms bin size, 0–2 s interval). These preliminary results are encouraging as AV nodal properties can be noninvasively assessed by a set of statistical parameters with a simple electrophysiological interpretation.
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| 4. |
- Fors, Carina, et al.
(författare)
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Analysis of breathing-related variations in ECG-triggered laser Doppler perfusion signals measured on the beating heart during surgery
- 2006
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Ingår i: Computers in cardiology. - 0276-6574. ; 33, s. 181-184
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Tidskriftsartikel (refereegranskat)abstract
- Laser Doppler perfusion monitoring (LDPM) is amethod to assess microvascular perfusion. A modified,ECG-triggered LDPM system has been developed tomeasure myocardial perfusion with minimum influencefrom heart motion. With this method, one systolic (PLS)and one diastolic (PLD) perfusion value is obtained.The aim of this study was to analyse breathing-relatedvariations in PLS and PLD measured during open-heartsurgery. The phase delays between PLS, PLD, meanarterial blood pressure (MAP), heart rate and, indirectly,the respiration were determined.MAP tended to be in phase with or precede thevariations in PLD, i.e., PLD was at a maximum at the endof inspiration or at the beginning of expiration. No clearrelation between PLS and any of the other signals couldbe found.
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| 5. |
- Heiberg, Einar, et al.
(författare)
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Automated Calculation of Infarct Transmurality
- 2007
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Ingår i: Computers in Cardiology 2007, vols 1 AND 2. - 0276-6574. ; , s. 165-168
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Konferensbidrag (refereegranskat)abstract
- The aim of this study was to develop all algorithm to automatically calculate infarct transmurality based oil a non dichotomous infarct classification, and to compare with manual delineation. Global transmurality as calculated by the computer algorithm were significantly smaller than the consensus delineation of three observers (p < 0.05). On a regional basis in 6 sectors of each slice the variability of the three observers compared to consensus delineation was 17%, 15%, and 20%. The variability of the automated algorithm was 16%. In conclusion, weighted calculation of transmurality gave smaller global transmurality compared to consensus delineation, but did had the same variability oil a regional basis.
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| 6. |
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| 7. |
- Platonov, Pyotr, et al.
(författare)
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Non-Invasive Estimates of Left Atrial Activation in a Patient with Dissociated Left Atrial Tachycardia following Ablation of Atrial Fibrillation
- 2009
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Ingår i: CINC: 2009 36TH Annual Computers In Cardiology Conference. - 0276-6574. - 9781424472819 ; , s. 133-136
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Konferensbidrag (refereegranskat)abstract
- Introduction: Interatrial frequency gradient is used to guide catheter ablation of atrial fibrillation (AF) but reliable tools for its non-invasive estimation are lacking. We present a patient with dissociated left and right atrial rhythms that allows identification of sum face ECG leads that closely reflect left atrial activity. Methods: 12-lead ECG was recorded simultaneously with electrograms from the right and left atrial appendages (RAA/LAA). AF frequency spectra have been calculated from all 12 leads using spatiotemporal QRST cancellation and Welch periodogram. The dominating atrial cycle length (ACL) in the surface ECG leads was subsequently compared with ACL(LAA). Results: RAA and LAA cycle lengths were 1276 ins and 252 ins respectively. Of all surface ECG leads, AF frequency spectra in leads VI and aVR demonstrated the best agreement with ACL(LAA) showing prominent peaks corresponding to the LAA activation frequency. Conclusion: Leads VI and aVR contain a prominent left atrial component that has to be considered when interpreting fibrillatry activity from sum face ECG.
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| 8. |
- Richter, Ulrike, et al.
(författare)
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Spatial characteristics of atrial fibrillation using the surface ECG
- 2007
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Ingår i: Computers in Cardiology. - 0276-6574. - 9781424425334 ; 34, s. 273-276
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Konferensbidrag (refereegranskat)abstract
- The present study investigates spatial properties of atrial fibrillation (AF) by analyzing VCG loops synthesized from 12-lead ECGs. During intervals with ventricular activity, the atrial signal is extracted using spatiotemporal QRST cancellation, thus making continuous f-wave analysis possible. Spatial properties are characterized through joint analysis of successive fixed-length signal segments, either of 1-s length or related to the typical length of an f-wave. The spatial properties are expressed in terms of loop orientation, i.e., angles of azimuth and elevation, as well as in morphologic terms such as planarity and planar geometry of the loops and related temporal variability. Several parameters have been suggested to characterize the degree of AF organization from electrogram analysis, but only a few parameters for noninvasive, ECG-based characterization of which AF frequency is the most studied. This parameter is related to atrial refractoriness and reflects AF organization. In the present study, the significance of spatial (loop morphology) parameters is studied in relation to AF frequency, hypothesizing that more organized AF, being expressed by a lower frequency, is associated with decreased variability in loop morphology. A total of 26 patients with chronic AF were analyzed with respect to spatial properties, using 60-s ECG recordings. For the database AF frequency ranged from 3.9 to 7.7 Hz, with a mean of 6.4±1.0 Hz (mean±std). The results showed that loop orientation can be determined from global analysis (i.e., the entire 60-s segment was used for determining the two angles) or the mean of segment-based analysis, both types of analysis leading to similar results. The hypothesis that more organized AF is associated with decreased variability in loop morphology was to some extent confirmed for the parameters planarity and planar geometry; for 1-s segments, the correlation to AF frequency was 0.608 (p<0.001) and 0.543 (p<0.005). This finding also applied to segment lengths related to f-wave duration. In conclusion, the simpler analysis based on 1-s segments may be preferred since it does not require f-wave delineation. Global analysis and the mean of segment-based analysis (1-s segments) showed increased planarity and decreased planar geometry for lower AF frequencies, possibly related to higher similarity of successive loops in more organized AF.
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| 9. |
- Richter, Ulrike, et al.
(författare)
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Wavefront detection from intra-atrial recordings
- 2007
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Ingår i: Computers in Cardiology. - 0276-6574. - 9781424425334 ; 34, s. 97-100
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Konferensbidrag (refereegranskat)abstract
- The present study deals with detection of intra-atrial wavefronts from atrial activation times in adjacent bipolar electrograms. A statistic of the delays within each wave-front was calculated and served as a basis for quantifying the wavefront consistency as well as the propagation of the electrical activity along the catheter. The database consisted of 19 patients for which five electrograms were recorded simultaneously during 10 s. The analysis resulted in 38plusmn2 complete wavefronts per patient, i.e., wavefronts consisting of one activation from each recording site. Two parameters were evaluated for quantifying wavefront consistency, which together with the propagation profile well reflect the overall wavefront timing. In most cases, electrical activity was observed first in the high septal right atrium, and then spread along the catheter.
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| 10. |
- Sandberg, Frida, et al.
(författare)
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Estimation of Respiratory Information from the Built-In Pressure Sensors of a Dialysis Machine
- 2014
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Ingår i: [Host publication title missing]. - 0276-6574. ; 41, s. 853-856
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Konferensbidrag (refereegranskat)abstract
- The purpose of the present study is to determine the feasibility of estimating respiratory information from the built-in pressure sensors of a dialysis machine. The study database consists of simultaneous recordings of pressure signals and capnographic signals from 6 patients during 7 hemodialysis treatment sessions. Respiration rates were estimated using respiratory induced variations in the beat- to-beat interval series of the cardiac component of the pressure signal and respiratory induced baseline varia- tions in the pressure signal, respectively. The estimated respiration rates were compared to a reference respira- tion rate determined from the capnograhpic signal. The root-mean-square error of the estimated respiration rate from the baseline variations of the pressure signal was 2.10 breaths/min; the corresponding error of the estimated res- piration rate from the beat-to-beat interval series of the cardiac component was 4.95 breaths/min. The results sug- gest that it is possible to estimate respiratory information from the pressure sensors.
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