近年来,集成电路制造工艺的巨大提高使得FPGA有能力实现大的数字系统电路。这些大的系统通常需要大量的存储器以存储数据。很多FPGA生产商已经推出了含有大的嵌入式存储器的FPGA芯片。然而,大多数学术方面的CAD工具只针对于同质的FPGA结...近年来,集成电路制造工艺的巨大提高使得FPGA有能力实现大的数字系统电路。这些大的系统通常需要大量的存储器以存储数据。很多FPGA生产商已经推出了含有大的嵌入式存储器的FPGA芯片。然而,大多数学术方面的CAD工具只针对于同质的FPGA结构(即只包括逻辑模块和布线通道的FPGA结构)。FPGA的布线结构通常被表示为RRG(布线资源图)。本文将介绍一种包含嵌入式存储器模块的FPGA的灵活结构以及一种建立RRG的方法。文中我们对VPR(versatile placing and routing)进行了改进,使得VPR可以处理包含嵌入式存储器结构的FPGA的布局布线问题,同时保持了VPR的灵活性。展开更多
Background:This study aimed to evaluate the performance of myocardial blood flow(MBF)and myocardial flow reserve(MFR)for diagnosing coronary artery disease(CAD)using dynamic single‐photon emission computed to-mograph...Background:This study aimed to evaluate the performance of myocardial blood flow(MBF)and myocardial flow reserve(MFR)for diagnosing coronary artery disease(CAD)using dynamic single‐photon emission computed to-mography/computed tomography(SPECT/CT)with a dual‐head rapidly rotating gantry(RRG)and to compare this method with conventional myocardial perfusion imaging(MPI),which can be obtained in a one‐stop manner.Methods:A total of 93 patients with suspected or confirmed CAD who un-derwent RRG SPECT/CT were retrospectively enrolled.They underwent invasive coronary angiography(ICA)and conventional MPI within 3 weeks.Based on the ICA results,the performance of MBF quantitative and semi‐quantitative parameters were compared at patient and vessel levels using≥50%and≥75%stenosis as the criteria for CAD diagnosis.Receiver operating characteristic(ROC)curve was used to evaluate the diagnostic efficacy of two types of parameters.Results:For patient‐level analysis,the area under ROC curves(AUCs)for stress MBF(sMBF),MFR,summed stress score(SSS),and summed different score(SDS)were 0.971,0.939,0.612,and 0.546,respectively,for≥50%stenosis as positive,and were 0.983,0.932,0.735,and 0.509,respectively,for≥75%stenosis as positive criteria.For vessel‐level analysis,the AUCs of sMBF,MFR,SSS,and SDS were 0.981,0.933,0.636,and 0.560,respectively,for≥50%stenosis as positive and were 0.984,0.933,0.767,and 0.583,respectively,for≥75%stenosis as positive criteria.Conclusions:Compared with semi‐quantitative parameters of conventional MPI,MBF quantitative parameters of dual‐head RRG SPECT had higher diagnostic performance for CAD.展开更多
文摘近年来,集成电路制造工艺的巨大提高使得FPGA有能力实现大的数字系统电路。这些大的系统通常需要大量的存储器以存储数据。很多FPGA生产商已经推出了含有大的嵌入式存储器的FPGA芯片。然而,大多数学术方面的CAD工具只针对于同质的FPGA结构(即只包括逻辑模块和布线通道的FPGA结构)。FPGA的布线结构通常被表示为RRG(布线资源图)。本文将介绍一种包含嵌入式存储器模块的FPGA的灵活结构以及一种建立RRG的方法。文中我们对VPR(versatile placing and routing)进行了改进,使得VPR可以处理包含嵌入式存储器结构的FPGA的布局布线问题,同时保持了VPR的灵活性。
基金Shaanxi Province key research and development plan,Grant/Award Number:S2024‐YF‐YBSF‐0395。
文摘Background:This study aimed to evaluate the performance of myocardial blood flow(MBF)and myocardial flow reserve(MFR)for diagnosing coronary artery disease(CAD)using dynamic single‐photon emission computed to-mography/computed tomography(SPECT/CT)with a dual‐head rapidly rotating gantry(RRG)and to compare this method with conventional myocardial perfusion imaging(MPI),which can be obtained in a one‐stop manner.Methods:A total of 93 patients with suspected or confirmed CAD who un-derwent RRG SPECT/CT were retrospectively enrolled.They underwent invasive coronary angiography(ICA)and conventional MPI within 3 weeks.Based on the ICA results,the performance of MBF quantitative and semi‐quantitative parameters were compared at patient and vessel levels using≥50%and≥75%stenosis as the criteria for CAD diagnosis.Receiver operating characteristic(ROC)curve was used to evaluate the diagnostic efficacy of two types of parameters.Results:For patient‐level analysis,the area under ROC curves(AUCs)for stress MBF(sMBF),MFR,summed stress score(SSS),and summed different score(SDS)were 0.971,0.939,0.612,and 0.546,respectively,for≥50%stenosis as positive,and were 0.983,0.932,0.735,and 0.509,respectively,for≥75%stenosis as positive criteria.For vessel‐level analysis,the AUCs of sMBF,MFR,SSS,and SDS were 0.981,0.933,0.636,and 0.560,respectively,for≥50%stenosis as positive and were 0.984,0.933,0.767,and 0.583,respectively,for≥75%stenosis as positive criteria.Conclusions:Compared with semi‐quantitative parameters of conventional MPI,MBF quantitative parameters of dual‐head RRG SPECT had higher diagnostic performance for CAD.
