Stupic, KF;
Ainslie, M;
Boss, MA;
Charles, C;
Dienstfrey, AM;
Evelhoch, JL;
Finn, P;
... Russek, SE; + view all
(2021)
A standard system phantom for magnetic resonance imaging.
Magnetic Resonance in Medicine
, 86
(3)
pp. 1194-1211.
10.1002/mrm.28779.
Preview |
Text
A standard system phantom for magnetic resonance imaging.pdf - Published Version Download (2MB) | Preview |
Abstract
Purpose: A standard MRI system phantom has been designed and fabricated to assess scanner performance, stability, comparability and assess the accuracy of quantitative relaxation time imaging. The phantom is unique in having traceability to the International System of Units, a high level of precision, and monitoring by a national metrology institute. Here, we describe the phantom design, construction, imaging protocols, and measurement of geometric distortion, resolution, slice profile, signal-to-noise ratio (SNR), proton-spin relaxation times, image uniformity and proton density. Methods: The system phantom, designed by the International Society of Magnetic Resonance in Medicine ad hoc committee on Standards for Quantitative MR, is a 200 mm spherical structure that contains a 57-element fiducial array; two relaxation time arrays; a proton density/SNR array; resolution and slice-profile insets. Standard imaging protocols are presented, which provide rapid assessment of geometric distortion, image uniformity, T1 and T2 mapping, image resolution, slice profile, and SNR. Results: Fiducial array analysis gives assessment of intrinsic geometric distortions, which can vary considerably between scanners and correction techniques. This analysis also measures scanner/coil image uniformity, spatial calibration accuracy, and local volume distortion. An advanced resolution analysis gives both scanner and protocol contributions. SNR analysis gives both temporal and spatial contributions. Conclusions: A standard system phantom is useful for characterization of scanner performance, monitoring a scanner over time, and to compare different scanners. This type of calibration structure is useful for quality assurance, benchmarking quantitative MRI protocols, and to transition MRI from a qualitative imaging technique to a precise metrology with documented accuracy and uncertainty.
| Type: | Article |
|---|---|
| Title: | A standard system phantom for magnetic resonance imaging |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/mrm.28779 |
| Publisher version: | http://dx.doi.org/10.1002/mrm.28779 |
| Language: | English |
| Additional information: | © 2021 The Authors. Magnetic Resonance in Medicine published by Wiley Periodicals LLC on behalf of International Society for Magnetic Resonance in Medicine. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | MRI standards, phantom, quality assurance, quantitative MRI |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10132702 |
Archive Staff Only
 |
View Item |
