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, G P Liney, PhD Radiation Physics Department, Queen’s Centre for Oncology and Haematology, Hull and East Yorkshire Hospitals NHS Trust, Castle Hill Hospital, Cottingham, UK Search for other works by this author on: Oxford Academic S C Owen, MSc Radiation Physics Department, Queen’s Centre for Oncology and Haematology, Hull and East Yorkshire Hospitals NHS Trust, Castle Hill Hospital, Cottingham, UK Search for other works by this author on: Oxford Academic A K E Beaumont, MSc Radiation Physics Department, Queen’s Centre for Oncology and Haematology, Hull and East Yorkshire Hospitals NHS Trust, Castle Hill Hospital, Cottingham, UK Search for other works by this author on: Oxford Academic V R Lazar, PhD Yorkshire Cancer Research Centre for Magnetic Resonance Investigations, The Hull–York Medical School, Hull Royal Infirmary, Hull, UK Search for other works by this author on: Oxford Academic D J Manton, PhD Yorkshire Cancer Research Centre for Magnetic Resonance Investigations, The Hull–York Medical School, Hull Royal Infirmary, Hull, UK Search for other works by this author on: Oxford Academic A W Beavis, PhD, FIPEM Radiation Physics Department, Queen’s Centre for Oncology and Haematology, Hull and East Yorkshire Hospitals NHS Trust, Castle Hill Hospital, Cottingham, UK Search for other works by this author on: Oxford Academic
British Journal of Radiology, Volume 86, Issue 1027, 1 July 2013, 20130150, https://doi.org/10.1259/bjr.20130150
Published:
19 June 2013
Article history
Received:
15 March 2013
Revision received:
06 May 2013
Accepted:
14 May 2013
Published:
19 June 2013
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G P Liney, S C Owen, A K E Beaumont, V R Lazar, D J Manton, A W Beavis, Commissioning of a new wide-bore MRI scanner for radiotherapy planning of head and neck cancer, British Journal of Radiology, Volume 86, Issue 1027, 1 July 2013, 20130150, https://doi.org/10.1259/bjr.20130150
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Objective:
A combination of CT and MRI is recommended for radiotherapy planning of head and neck cancers, and optimal spatial co-registration is achieved by imaging in the treatment position using the necessary immobilisation devices on both occasions, something which requires wide-bore scanners. Quality assurance experiments were carried out to commission a newly installed 1.5-T wide-bore MRI scanner and a dedicated, flexible six-channel phased array head and neck coil.
Methods:
Signal-to-noise ratio (SNR) and spatial signal uniformity were quantified using a hom*ogeneous aqueous phantom, and geometric distortion was quantified using a phantom with water-filled fiducials in a grid pattern. Volunteer scans were also used to determine the in vivo image quality. Clinically relevant T 1 weighted and T 2 weighted fat-suppressed sequences were assessed in multiple scan planes (both sequences fast spin echo based). The performance of two online signal uniformity correction schemes, one utilising low-resolution reference scans and the other not utilising low-resolution reference scans, was compared.
Results:
Geometric distortions, for a ±35-kHz bandwidth, were <1 mm for locations within 10 cm of the isocentre rising to 1.8 mm at 18 cm away. SNR was above 50, and uniformity in the axial plane was 71% and 95% before and after uniformity correction, respectively.
Conclusion:
The combined performance of the wide-bore scanner and the dedicated coil was adjudged adequate, although superior–inferior spatial coverage was slightly limited in the lower neck.
Advances in knowledge:
These results will be of interest to the increasing number of oncology centres that are seeking to incorporate MRI into planning practice using dedicated equipment.
© 2013 The Authors. Published by the British Institute of Radiology
This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)
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