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PubMed · 9079440

Method for correcting magnetic resonance image distortion for frame-based stereotactic surgery, with preliminary results.

T S Sumanaweera·J R Adler·G H Glover·P F Hemler·P A van den Elsen·D Martin·S Napel
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Abstract

We previously described a technique for correcting patient-specific magnetic field inhomogeneity spatial distortion in magnetic resonance images (MRI), which was not applicable to patients fitted with MRI-compatible stereotactic fiducial frames. Here we describe an improvement to the technique that permits application for these patients. Measurements with a cadaver head show that this method achieves MRI stereotactic localization accuracy of 1 mm.

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HeadHumansImage Processing, Computer-AssistedMagnetic Resonance ImagingNeurosurgeryPhantoms, ImagingStereotaxic TechniquesJournal ArticleResearch Support, Non-U.S. Gov'tResearch Support, U.S. Gov't, Non-P.H.S.

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T S Sumanaweera, J R Adler, G H Glover, P F Hemler, P A van den Elsen, D Martin, S Napel. 1995. Method for correcting magnetic resonance image distortion for frame-based stereotactic surgery, with preliminary results.. https://doi.org/10.1002/(sici)1522-712x(1995)1%3A3%3C151%3A%3Aaid-igs4%3E3.0.co%3B2-9

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PURPOSE: The development of new operative techniques in oral and maxillofacial surgery within the last few years has led to an increasing demand for Dentascan examination, also in paediatric patients. It is necessary to modify acquisition parameters to reduce the absorbed dose. The aim of this study was to define a Dentascan protocol in which a reduced X-ray dose could be used. MATERIALS AND METHODS: Dosimeters were applied to the eyes, mouth, parotid glands, thyroid and back of the neck of an anthropomorphic Plexiglas phantom that underwent multidetector computed tomography (MDCT) Dentascan examinations. Both 120kV and 80 kV were used to study the mandibular and maxillary arches. RESULTS: Examinations obtained with the 80 kV protocol showed a ten-fold reduction in the absorbed dose, without affecting image quality. CONCLUSIONS: We suggest a Dentascan protocol that reduces the X-ray dose administered to the patient while ensuring the same high diagnostic accuracy.

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