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biac:scanners
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| ===== Quality Assurance (QA) ===== | ===== Quality Assurance (QA) ===== | ||
| BIAC routinely collects quality assurance data using AGAR phantoms on both 3T scanners. The goal is to collect this data on each scanner daily. At a minimum, it should be collected a few times per week. This data allows us to evaluate the scanners SNR and SFNR values, which in turn allow us to closely monitor scanner performance and quickly identify and diagnose problems. QA analysis tools also provide figures of merit for the mean signal, standard deviations, and signal stability in the X, Y, and Z planes. | BIAC routinely collects quality assurance data using AGAR phantoms on both 3T scanners. The goal is to collect this data on each scanner daily. At a minimum, it should be collected a few times per week. This data allows us to evaluate the scanners SNR and SFNR values, which in turn allow us to closely monitor scanner performance and quickly identify and diagnose problems. QA analysis tools also provide figures of merit for the mean signal, standard deviations, and signal stability in the X, Y, and Z planes. | ||
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| + | A history of regular QA can be seen here : [[https:// | ||
| In addition to BIAC's QA procedures, GE also runs a quality control program every month called ibis. This program monitors, and adjusts if necessary X, Y, and Z gradient shimming (LVshim). The GE system performance tests checks and logs stability and SNR data on the scanner, which can be recalled from the scanner' | In addition to BIAC's QA procedures, GE also runs a quality control program every month called ibis. This program monitors, and adjusts if necessary X, Y, and Z gradient shimming (LVshim). The GE system performance tests checks and logs stability and SNR data on the scanner, which can be recalled from the scanner' | ||
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| Finally, for every scanning session, BIAC collects data on the SNR, SFNR, standard deviation, drift, mean signal, first time point of data (t1), and provides plots of signal stability in the X, Y , and Z planes (plot). These data are available to investigators immediately after the data has been collected and reconstructed. These can be found by logging into the BIAC Exam Tracker here: http:// | Finally, for every scanning session, BIAC collects data on the SNR, SFNR, standard deviation, drift, mean signal, first time point of data (t1), and provides plots of signal stability in the X, Y , and Z planes (plot). These data are available to investigators immediately after the data has been collected and reconstructed. These can be found by logging into the BIAC Exam Tracker here: http:// | ||
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| - | ===== Cluster ===== | ||
| - | BIAC's new Linux cluster has 51 nodes with a total of 456 Intel Xeon processor cores and 1.75 TB of memory. The cluster is based on Scientific Linux 6.4 and is running the Sun Grid Engine for job scheduling. BIAC maintains a large library of commercial and custom software for functional and structural MRI analysis, for the analysis of MR spectroscopy data, and for fiber tractography from DTIs. Available processing and analysis software include current releases of FSL, freesurfer, matlab (with: BIAC's matlab tools, spm8, ArtRepair), support vector libraries (liblinear, libsvm) , python tools (python-mvpa, | ||
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| - | Centralized data storage is provided by a BlueArc Titan 2500 enterprise-class storage server with Fibre Channel disk arrays and dual 10 Gigabit Ethernet connections. The Titan is supplemented by several HP ProLiant and Western Scientific FusionSA servers. Total storage capacity is 120 TB. Automated processes move the image data directly from the scanners and organize the data into a hierarchy on the storage servers. For archiving and backing up data, BIAC has a Qualstar RLS-4470 tape robot equipped with dual AIT-5 drives, 70 slots, and 28 TB native capacity. The central computation and storage systems can be accessed from the campus network, or from two data analysis laboratories located within the BIAC and available to all users. | ||
biac/scanners.1610483218.txt.gz · Last modified: 2021/01/12 20:26 by jel76
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