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A multi-center inter-manufacturer study of the temporal stability of phase-contrast velocity mapping background offset errors
- Source :
- Gatehouse, P D, Rolf, M P, Bloch, K M, Graves, M J, Kilner, P J, Firmin, D N & Hofman, M B M 2012, ' A multi-center inter-manufacturer study of the temporal stability of phase-contrast velocity mapping background offset errors ', Journal of Cardiovascular Magnetic Resonance, vol. 14, art72 . https://doi.org/10.1186/1532-429X-14-72, Journal of Cardiovascular Magnetic Resonance; 14(72) (2012), Journal of Cardiovascular Magnetic Resonance, Vol 14, Iss Suppl 1, p W48 (2012), Journal of Cardiovascular Magnetic Resonance, Journal of Cardiovascular Magnetic Resonance, 14:art72. BioMed Central, Journal of Cardiovascular Magnetic Resonance, Vol 14, Iss 1, p 72 (2012)
- Publication Year :
- 2012
- Publisher :
- Springer Science and Business Media LLC, 2012.
-
Abstract
- Background Phase-contrast velocity images often contain a background or baseline offset error, which adds an unknown offset to the measured velocities. For accurate flow measurements, this offset must be shown negligible or corrected. Some correction techniques depend on replicating the clinical flow acquisition using a uniform stationary phantom, in order to measure the baseline offset at the region of interest and subtract it from the clinical study. Such techniques assume that the background offset is stable over the time of a patient scan, or even longer if the phantom scans are acquired later, or derived from pre-stored background correction images. There is no published evidence regarding temporal stability of the background offset. Methods This study assessed the temporal stability of the background offset on 3 different manufacturers’ scanners over 8 weeks, using a retrospectively-gated phase-contrast cine acquisition with fixed parameters and at a fixed location, repeated 5 times in rapid succession each week. A significant offset was defined as 0.6 cm/s within 50 mm of isocenter, based upon an accuracy of 10% in a typical cardiac shunt measurement. Results Over the 5 repeated cine acquisitions, temporal drift in the baseline offset was insignificant on two machines (0.3 cm/s, 0.2 cm/s), and marginally insignificant on the third machine (0.5 cm/s) due to an apparent heating effect. Over a longer timescale of 8 weeks, insignificant drift (0.4 cm/s) occurred on one, with larger drifts (0.9 cm/s, 0.6 cm/s) on the other machines. Conclusions During a typical patient study, background drift was insignificant. Extended high gradient power scanning with work requires care to avoid drift on some machines. Over the longer term of 8 weeks, significant drift is likely, preventing accurate correction by delayed phantom corrections or derivation from pre-stored background offset data.
- Subjects :
- Cardiac output
lcsh:Diseases of the circulatory (Cardiovascular) system
Offset (computer science)
Time Factors
Phase contrast microscopy
Whole body imaging
Magnetic Resonance Imaging, Cine
velocity offset error
Imaging phantom
law.invention
Clinical study
Magnetic resonance imaging
Region of interest
Velocity mapping
law
Predictive Value of Tests
Image Interpretation, Computer-Assisted
Medicine
Humans
Cardiac and Cardiovascular Systems
Whole Body Imaging
Radiology, Nuclear Medicine and imaging
Simulation
Medicine(all)
Radiological and Ultrasound Technology
business.industry
Phantoms, Imaging
Shunt flow
Reproducibility of Results
Regurgitation
Equipment Design
Geodesy
Phase-contrast velocity mapping
Europe
Background
Workshop Presentation
Background Correction
lcsh:RC666-701
Background velocity offset error
Technical Notes
business
Cardiology and Cardiovascular Medicine
Subjects
Details
- ISSN :
- 1532429X and 10976647
- Volume :
- 14
- Database :
- OpenAIRE
- Journal :
- Journal of Cardiovascular Magnetic Resonance
- Accession number :
- edsair.doi.dedup.....90849166ac5993705a4dba3b2ce9aa9b