The evolution of parallel computing architectures presents new challenges for developing efficient parallelized codes. The emergence of heterogeneous systems has given rise to multiple programming models, each requiring careful adaptation to maximize performance. In this context, we propose reevaluating memory layout designs for computational tasks...
When developing scientific and/or data science applications, users might start by using a scripting language to quickly produce a prototype, but eventually need to rewrite their code in a higher performance language when performance becomes a bottleneck. A similar situation arises when the applications need to scale beyond a single node. Users need...
Published in Physics in Medicine & Biology
Objective. The availability of magnetic nanoparticles (MNPs) with medical approval for human intervention is fundamental to the clinical translation of magnetic particle imaging (MPI). In this work, we thoroughly evaluate and compare the magnetic properties of an magnetic resonance imaging (MRI) approved tracer to validate its performance for MPI i...
Tato diplomová práce se zabývá implementací adaptivní datové struktury octree pro knihovnu TNL v programovacím jazyce C++. Tato struktura se požívá pro efektivní práci s trojrozměrnými objekty v oblastech jako počítačová grafika a vědecké výpočty. Také byla implementována paralelní verze octree pomocí rozhraní MPI. V práci jsou prozkoumány různé me...
Tato práce se věnuje vybraným metodám pro hledání vlastních čísel a vlastních vektorů symetrických řídkým matic nad hybridním paralelním programovacím modelem MPI+OpenMP v jazyce C++. Práce má za cíl vylepšit existující implementaci jedno-vektorového i blokového Lanczosova algoritmu. Vyvinuté alternativní implementace jsou jedno-vektorové i blokové...
Published in European journal of nuclear medicine and molecular imaging
We evaluated the impact on cardiovascular outcome of coronary revascularization-induced changes in ischemic total perfusion defect (ITPD) and myocardial flow reserve (MFR) as assessed by 82Rb positron emission tomography (PET)/computed tomography (CT) imaging. The study included 102 patients referred to 82Rb PET/CT myocardial perfusion imaging befo...
The adoption of ARM processor architectures is on the rise in the HPC ecosystem. Fugaku supercomputer is a homogeneous ARMbased machine, and is one among the most powerful machine in the world. In the programming world, dependent task-based programming models are gaining tractions due to their many advantages: dynamic load balancing, implicit expre...
Published in Frontiers in Computer Science
In this study, we present a fast algorithm for the numerical solution of the heat equation. The heat equation models the heat diffusion over time and through a given region. We engage a finite difference method to solve this equation numerically. The performance of its parallel implementation is considered using Message Passing Interface (MPI), Com...
Published in Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology
To elucidate the value of gated SPECT-MPI using CT attenuation correction (AC) for prediction of pulmonary hypertension (PHT) in coronary patients by estimation of reliability of non-contrast CT in measurement of main pulmonary artery diameter (MPAd) as well as by assessment of potential predictive role of gated parameters as beneficial accessory f...
