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2013 International Workshop on Magnetic Particle Imaging (IWMPI)最新文献

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Preparation, structure, and magnetic properties of CuMnFe2O4 nanoparticles for magnetic particle imaging 磁成像用CuMnFe2O4纳米颗粒的制备、结构和磁性能
2013 International Workshop on Magnetic Particle Imaging (IWMPI) Pub Date : 2013-03-23 DOI: 10.1109/IWMPI.2013.6528340
N. Dogan, A. Bingolbali, L. Arda, M. Asi̇lturk
{"title":"Preparation, structure, and magnetic properties of CuMnFe2O4 nanoparticles for magnetic particle imaging","authors":"N. Dogan, A. Bingolbali, L. Arda, M. Asi̇lturk","doi":"10.1109/IWMPI.2013.6528340","DOIUrl":"https://doi.org/10.1109/IWMPI.2013.6528340","url":null,"abstract":"The crystal structure of the synthesized magnetic nanoparticles was analyzed with XRD and SEM. Effect of doping value on microstructure was analyzed by XRD. Results are shown in Figure 1. The average particles sizes of samples were obtained by nanosize measure of Zeta Sizer Nano-ZS instrument results at room temperature. Particle size determined within 42-57 nm given Table 1.","PeriodicalId":267566,"journal":{"name":"2013 International Workshop on Magnetic Particle Imaging (IWMPI)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125572924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Early results on image and signal processing for characterization of blood flow in 4D MPI images 4D MPI图像中血流特征的图像和信号处理的初步结果
2013 International Workshop on Magnetic Particle Imaging (IWMPI) Pub Date : 2013-03-23 DOI: 10.1109/IWMPI.2013.6528356
R. Lacroix, J. Rahmer, J. Borgert, O. Bonnefous, S. Makram-Ebeid
{"title":"Early results on image and signal processing for characterization of blood flow in 4D MPI images","authors":"R. Lacroix, J. Rahmer, J. Borgert, O. Bonnefous, S. Makram-Ebeid","doi":"10.1109/IWMPI.2013.6528356","DOIUrl":"https://doi.org/10.1109/IWMPI.2013.6528356","url":null,"abstract":"Our harmonic analysis has proven well suited to filter the MPI temporal signal and analytically reconstruct the behavior of the contrast product within a single averaged cardiac cycle. A sine-shaped temporal evolution of the signal is clearly visible within every voxel of a heart chamber, with more than ten times the amplitude of the background. The atrial and ventricular contraction and dilation behavior contribute to a periodic time signal with heart cycle periodicity. The streamlines of the ∇φ(p, t) vector field shown in figure 1 within the heart chambers may reveal an interesting velocity pattern. In view of the limited resolution of the current data, it is hard to separate the contributions of wall motion from flow in the v(p,t) maps. The large PSF of the system as compared with the heart chambers sizes hampers a reliable interpretation.","PeriodicalId":267566,"journal":{"name":"2013 International Workshop on Magnetic Particle Imaging (IWMPI)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126312092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
System calibration unit for magnetic particle imaging: System matrix 磁粉成像的系统校准单元:系统矩阵
2013 International Workshop on Magnetic Particle Imaging (IWMPI) Pub Date : 2013-03-23 DOI: 10.1109/IWMPI.2013.6528344
A. Halkola, J. Rahmer, B. Gleich, J. Borgert, T. Buzug
{"title":"System calibration unit for magnetic particle imaging: System matrix","authors":"A. Halkola, J. Rahmer, B. Gleich, J. Borgert, T. Buzug","doi":"10.1109/IWMPI.2013.6528344","DOIUrl":"https://doi.org/10.1109/IWMPI.2013.6528344","url":null,"abstract":"Magnetic particle imaging (MPI) has the potential to deliver images at high time resolution and submillimetre spatial resolution. In order to reconstruct the images from the measured data one needs to obtain a so called system matrix. A system matrix can be measured by physically moving a voxel sized sample and measuring the signal at each position within the imaging volume of the scanner. A system calibration unit (SCU) provides a fast and efficient method to measure a system matrix. The physical movement of the sample can be replaced by the use of homogeneous focus fields. This resulted in time saving of a factor of 2-3. In this paper, the use of sensitive dedicated receive coils is described that provide a further improvement by up to an order of magnitude in sensitivity.","PeriodicalId":267566,"journal":{"name":"2013 International Workshop on Magnetic Particle Imaging (IWMPI)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128175093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
Assessing the limits of MPI tracer performance 评估MPI示踪剂性能的极限
2013 International Workshop on Magnetic Particle Imaging (IWMPI) Pub Date : 2013-03-23 DOI: 10.1109/IWMPI.2013.6528376
R. M. Ferguson, A. Khandhar, H. Arami, S. Conolly, K. Krishnan
{"title":"Assessing the limits of MPI tracer performance","authors":"R. M. Ferguson, A. Khandhar, H. Arami, S. Conolly, K. Krishnan","doi":"10.1109/IWMPI.2013.6528376","DOIUrl":"https://doi.org/10.1109/IWMPI.2013.6528376","url":null,"abstract":"Simulations of m'(H) (Fig 1B), which matched MPS (Fig 1C, D) and PSFs (Fig 1A), can be used to predict tracer behavior during imaging. Under applied field conditions commonly used in MPI (25 kHz, 20 mT/μ<sub>0</sub>), our model predicts that hysteresis will appear in m(H) loops for particles larger than 20 nm diameter, when K<sub>eff</sub> is 6000 [J m<sup>-3</sup>], which is the average K<sub>eff</sub> measured for our MPI tracer. Due to thermal fluctations, the model predicts a maximum coercive field that is less than predicted by the original Stoner-Wohlfarth model, which is given by 2K<sub>eff</sub>/M<sub>s</sub>, where M<sub>S</sub>, is the saturation magnetization. For a fixed value of K<sub>eff</sub>, the model predicts that coercive field increases with median particle size, however the FWHM of m'(H) remains relatively unchanged as the loop opens up with increasing particle size. In simulations, the FWHM of m'(H) decreased with K<sub>eff</sub>. The minimum FWHM predicted by the model when K<sub>eff</sub> is 6000 was 5 mT; this was consistent with the measured FWHM (5.5 mT) for 25 nm tracers.","PeriodicalId":267566,"journal":{"name":"2013 International Workshop on Magnetic Particle Imaging (IWMPI)","volume":"603 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116208151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
MPI tracer magnetization simulated using a Kinetic Monte Carlo method 用动力学蒙特卡罗方法模拟MPI示踪剂磁化
2013 International Workshop on Magnetic Particle Imaging (IWMPI) Pub Date : 2013-03-23 DOI: 10.1109/IWMPI.2013.6528374
L. Hua, O. Hovorka, R. M. Ferguson, R. Chantrell, K. Krishnan
{"title":"MPI tracer magnetization simulated using a Kinetic Monte Carlo method","authors":"L. Hua, O. Hovorka, R. M. Ferguson, R. Chantrell, K. Krishnan","doi":"10.1109/IWMPI.2013.6528374","DOIUrl":"https://doi.org/10.1109/IWMPI.2013.6528374","url":null,"abstract":"From agreement between simulations and experiments, we conclude that MPI tracers can be treated as ferromagnets under typical field conditions. By varying the dispersion of the anisotropy field of each particle, we effectively modeled features of the hysteresis curve that were expected due to the presence of size distribution in the particles and we properly predicted notable features of the magnetization, such as appearance of hysteresis as a function of size and frequency.","PeriodicalId":267566,"journal":{"name":"2013 International Workshop on Magnetic Particle Imaging (IWMPI)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134029470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Receive coil optimization for an open magnetic particle imaging scanner 接收线圈优化的开放式磁颗粒成像扫描仪
2013 International Workshop on Magnetic Particle Imaging (IWMPI) Pub Date : 2013-03-23 DOI: 10.1109/IWMPI.2013.6528336
W. Tenner, H. Wojtczyk, G. Bringout, M. Graeser, M. Gruttner, J. Haegele, R. Duschka, N. Panagiotopoulos, F. Vogt, J. Barkhausen, T. Buzug
{"title":"Receive coil optimization for an open magnetic particle imaging scanner","authors":"W. Tenner, H. Wojtczyk, G. Bringout, M. Graeser, M. Gruttner, J. Haegele, R. Duschka, N. Panagiotopoulos, F. Vogt, J. Barkhausen, T. Buzug","doi":"10.1109/IWMPI.2013.6528336","DOIUrl":"https://doi.org/10.1109/IWMPI.2013.6528336","url":null,"abstract":"Helmholtz-like coil pairs with a radius of 15 cm have the highest sensitivity for the given geometry. Their homogeneity decreases with higher radius, which is both shown in Fig. 4. Arrays of circular coils show very good homogeneity, which further increases with increasing number of coils, but have comparably poor sensitivity in the FOV. D-shaped coils have both decreasing sensitivity and homogeneity with increasing radius. An increasing distance between a D-coil pair increases the homogeneity, but leads to decreasing sensitivity. Nested D-coils can show an improved homogeneity without a loss in sensitivity. Optimized circular and not nested D-shaped coil pairs with a radius of 15 cm were manufactured and the resonance frequency for both geometries was measured to be about 1.9 MHz for the tight and 2.6 MHz for the loose winding technique.","PeriodicalId":267566,"journal":{"name":"2013 International Workshop on Magnetic Particle Imaging (IWMPI)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124060840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
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