Determining a reliably visible and inexpensive surface fiducial marker for use in MRI: A research study in a busy Australian Radiology Department

Autor: Maree T. Izatt, Susan L. Mills, Deborah Lees, J. Paige Little, Caroline A. Grant
Rok vydání: 2019
Předmět:
medicine.medical_specialty
Biomedical Research
marker visibility
lcsh:Medicine
inexpensive marker
law.invention
03 medical and health sciences
0302 clinical medicine
surface marker
low cost marker
Fiducial Markers
law
MRI sequence
090399 Biomedical Engineering not elsewhere classified
Quantitative assessment
Humans
Medicine
magnetic resonance imaging
cheap marker
030212 general & internal medicine
Clinical imaging
Proton density
Qualitative Research
Maximum intensity
Radiology Department
Hospital
medicine.diagnostic_test
business.industry
Research
lcsh:R
Australia
Outcome measures
Reproducibility of Results
fiducial marker
Magnetic resonance imaging
General Medicine
marker intensity
Plasticine
Radiology
low-cost marker
business
Fiducial marker
030217 neurology & neurosurgery
110314 Orthopaedics
MRI
Zdroj: BMJ Open
BMJ Open, Vol 9, Iss 8 (2019)
ISSN: 2381-3652
Popis: ObjectivesSingle-use commercial surface fiducial markers are used in clinical imaging for a variety of applications. The current study sought to find a new, reliably visible, easily sourced and inexpensive fiducial marker alternative for use with MRI.DesignFive commonly requested MRI sequences were determined (three-dimensional (3D) T1-weighted, T1 coronal, 3D T2-weighted, T2 fat suppressed, proton density), to examine the visibility of 18 items (including a commercial fiducial marker).SettingClinical 3T MRI scanner in an Australian Tertiary Hospital and an Australian University Biomedical Engineering research group.Interventions18 marker alternatives were scanned using five common MRI sequences. Images were reformatted to obtain both an image through the mid-height of each marker and a maximum intensity z-projection image over the volume of the marker. Variations in marker intensity were profiled across each visible marker and a visibility rating defined.Main outcome measuresOutcome measures were based on quantitative assessment of a clear intensity contrast ratio between the marker and the adjacent tissue and a qualitative assessment of visibility via a 3-point scale.ResultsThe fish oil capsule, vitamin D capsule, paint ball pellet, soy sauce sushi tube and commercial markers were typically visible to a high quality on all the imaging sequences and demonstrated a clear differential in intensity contrast against the adjacent tissue. Other common items, such as plasticine ‘play doh’ and a soft ‘Jelly baby’ sweet, were surprise candidates, demonstrating high-quality visibility and intensity contrast for the 3D T1-weighted sequence.ConclusionsDepending on the basis for referral and MRI sequence chosen, four alternative fiducial markers were determined to be inexpensive, easily sourced and consistently visible. Of these, the vitamin D capsule provided an excellent balance between availability, size, cost, usability and quality of the visualised marker for all the commonly used MRI sequences analysed.
Databáze: OpenAIRE
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