Slice Encoding for Metal Artefact Correction in magnetic resonance imaging examinations for radiotherapy planning.
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Date
2016-08-01Author
Schmidt, MA
Panek, R
Colgan, R
Hughes, J
Sohaib, A
Saran, F
Murray, J
Bernard, J
Revell, P
Nittka, M
Leach, MO
Hansen, VN
Type
Journal Article
Metadata
Show full item recordAbstract
BACKGROUND AND PURPOSE: Magnetic resonance (MR) and computed tomography (CT) images are degraded in the presence of metallic implants. We investigate whether SEMAC (Slice Encoding for Metal Artifact Correction) MR is advantageous for radiotherapy (RT) planning. METHODS: Conventional and SEMAC MR protocols were compared (1.5T). A spine fixation device suspended in gelatine, two patients with spine fixation devices and six patients with bilateral hip replacements were scanned with both conventional and SEMAC protocols. In spine patients the visibility of the spinal canal and spinal cord was assessed; in prostate patients, the visibility of the prostate, pelvic structures and the pelvic girdle. RESULTS: The signal loss volume surrounding the spine fixation device was reduced by approximately 20% when the SEMAC protocol was employed, and registration errors were reduced. For spine patients, the spinal canal was completely visible only using the SEMAC protocol. In hip replacement patients, metal artifacts were local; the signal loss extended to the internal surface of the acetabulum in eight implants with conventional protocols, but only in four using SEMAC. CONCLUSIONS: SEMAC MR contributes towards correct co-registration of MR and CT images for RT planning, and is particularly relevant when the TV or OARs are close to implants.
Collections
Subject
Spine
Humans
Prostatic Neoplasms
Metals
Tomography, X-Ray Computed
Magnetic Resonance Imaging
Image Enhancement
Radiotherapy Planning, Computer-Assisted
Fracture Fixation, Internal
Artifacts
Prostheses and Implants
Male
Research team
Clinical Academic Radiotherapy (Dearnaley)
Magnetic Resonance
Language
eng
Date accepted
2016-05-05
License start date
2016-08
Citation
Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology, 2016, 120 (2), pp. 356 - 362
Publisher
ELSEVIER IRELAND LTD