A scan-specific quality control acquisition for clinical whole-body (WB) MRI protocols.

Autor:	Keaveney S; MRI Unit, Royal Marsden NHS Foundation Trust, London, United Kingdom.; Division of Radiotherapy and Imaging, The Institute of Cancer Research, London, United Kingdom., Hopkinson G; MRI Unit, Royal Marsden NHS Foundation Trust, London, United Kingdom., Markus JE; Centre for Medical Imaging, University College London, London, United Kingdom., Priest AN; Department of Imaging, Addenbrookes Hospital, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom.; Department of Radiology, University of Cambridge, Cambridge, United Kingdom., Scurr E; MRI Unit, Royal Marsden NHS Foundation Trust, London, United Kingdom., Hughes J; MRI Unit, Royal Marsden NHS Foundation Trust, London, United Kingdom., Robertson S; MRI Unit, Royal Marsden NHS Foundation Trust, London, United Kingdom., Doran SJ; MRI Unit, Royal Marsden NHS Foundation Trust, London, United Kingdom.; Division of Radiotherapy and Imaging, The Institute of Cancer Research, London, United Kingdom., Collins DJ; MRI Unit, Royal Marsden NHS Foundation Trust, London, United Kingdom.; Division of Radiotherapy and Imaging, The Institute of Cancer Research, London, United Kingdom., Messiou C; MRI Unit, Royal Marsden NHS Foundation Trust, London, United Kingdom.; Division of Radiotherapy and Imaging, The Institute of Cancer Research, London, United Kingdom., Koh DM; MRI Unit, Royal Marsden NHS Foundation Trust, London, United Kingdom.; Division of Radiotherapy and Imaging, The Institute of Cancer Research, London, United Kingdom., Winfield JM; MRI Unit, Royal Marsden NHS Foundation Trust, London, United Kingdom.; Division of Radiotherapy and Imaging, The Institute of Cancer Research, London, United Kingdom.
Jazyk:	angličtina
Zdroj:	Physics in medicine and biology [Phys Med Biol] 2024 Jun 17; Vol. 69 (12). Date of Electronic Publication: 2024 Jun 17.
DOI:	10.1088/1361-6560/ad4195
Abstrakt:	Objective. Image quality in whole-body MRI (WB-MRI) may be degraded by faulty radiofrequency (RF) coil elements or mispositioning of the coil arrays. Phantom-based quality control (QC) is used to identify broken RF coil elements but the frequency of these acquisitions is limited by scanner and staff availability. This work aimed to develop a scan-specific QC acquisition and processing pipeline to detect broken RF coil elements, which is sufficiently rapid to be added to the clinical WB-MRI protocol. The purpose of this is to improve the quality of WB-MRI by reducing the number of patient examinations conducted with suboptimal equipment. Approach. A rapid acquisition (14 s additional acquisition time per imaging station) was developed that identifies broken RF coil elements by acquiring images from each individual coil element and using the integral body coil. This acquisition was added to one centre's clinical WB-MRI protocol for one year (892 examinations) to evaluate the effect of this scan-specific QC. To demonstrate applicability in multi-centre imaging trials, the technique was also implemented on scanners from three manufacturers. Main results . Over the course of the study RF coil elements were flagged as potentially broken on five occasions, with the faults confirmed in four of those cases. The method had a precision of 80% and a recall of 100% for detecting faulty RF coil elements. The coil array positioning measurements were consistent across scanners and have been used to define the expected variation in signal. Significance . The technique demonstrated here can identify faulty RF coil elements and positioning errors and is a practical addition to the clinical WB-MRI protocol. This approach was fully implemented on systems from two manufacturers and partially implemented on a third. It has potential to reduce the number of clinical examinations conducted with suboptimal hardware and improve image quality across multi-centre studies. (Creative Commons Attribution license.)
Databáze:	MEDLINE
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