Introduction: The main purpose of this study was to compare transient ischemic dilation (TID) ratios in SPECT-low dose CT and SPECT Myocardial Perfusion Imaging (MPI) by application of different quantitative programs and quantify the possible shift in the upper normal limits of TID ratio in the SPECT-CT MPI. Methods: 149 Patients with low pre-test probability for coronary artery disease (CAD),...

background: cardiac risk assessment with myocardial perfusion imaging (mpi) is a common practice for some elderly breast cancer patients who are candidates for operation. in rare cases the tumor may become visible in the images. case presentation: this is the report of a case with a huge slow-growing breast tumor suspicious for malignancy and presenting with methoxy-isobutyl-isonitrile (mibi) u...

Patients with Congenital Disorders of Glycosylation (CDG) have recessive mutations in genes required for protein N-glycosylation, resulting in multi-systemic disease. Despite the well-characterized biochemical consequences in these patients, the underlying cellular defects that contribute to CDG are not well-understood. Synthesis of the lipid-linked oligosaccharide (LLO), which serves as the su...

OBJECTIVES The coronary artery calcium (CAC) score has been shown to predict future cardiac events. However the extent to which the added value of a CAC score to the diagnostic performance of myocardial perfusion imaging (MPI) by single photon emission computed tomography (SPECT) is unclear. The purpose of this study is to investigate the correlation between CAC score and SPECT in patients with...

| This paper presents an implementation of the Message Passing Interface called PACX-MPI. The major goal of the library is to support heterogeneous metacomputing for MPI applications by clustering MPP's and PVP's. The key concept of the library is a daemon-concept. We will focus in this paper on two aspects of this library. First we will show the importance of the usage of optimized algorithms ...

Magnetic particle imaging (MPI) is a new tomographic imaging method potentially capable of rapid 3D dynamic imaging of magnetic tracer materials. Until now, only dynamic 2D phantom experiments with high tracer concentrations have been demonstrated. In this letter, first in vivo 3D real-time MPI scans are presented revealing details of a beating mouse heart using a clinically approved concentrat...

Our study proposes a novel MPI-only parallel programming model with improved performance for SMP clusters. By rescheduling tasks in a typical flat MPI solution, our model forces processors of an SMP node to work in different phases, thereby avoiding unneccessary communication and computation bottlenecks. This study achieves a significant performance improvement with a minimal programming effort...

Charm++ may employ any of a myriad network-specific APIs for handling communication, which are usually promoted as being faster than its catch-all MPI module. Such a performance difference not only causes development effort to be spent on tuning vendor-specific APIs but also discourages hybrid Charm++/MPI applications. We investigate this disparity across several machines and applications, rang...

We propose lightweight middleware solutions that facilitate and simplify the execution of failure-resilient MPI programs across multidomain clusters. The system described in this paper leverages H2O, a distributed metacomputing framework, to route MPI message passing across heterogeneous aggregates located in different administrative or network domains. MPI programs instantiate a specially writ...