Int J Comput Assist Radiol Surg - MR image overlay guidance: system evaluation for preclinical use.

Tópicos

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Resumo

RPOSE: A clinical augmented reality guidance system was developed for MRI-guided musculoskeletal interventions Magnetic Resonance Image Overlay System (MR-IOS). The purpose of this study was to assess MRI compatibility, system accuracy, technical efficacy, and operator performance of the MR-IOS.METHODS AND MATERIALS: The impact of the MR-IOS on the MR environment was assessed by measuring image quality with signal-to-noise ratio (SNR) and signal intensity uniformity with the system in various on/off states. The system accuracy was assessed with an in-room preclinical experiment by performing 62 needle insertions on a spine phantom by an expert operator measuring entry, depth, angle, and target errors. Technical efficacy and operator performance were tested in laboratory by running an experiment with 40 novice operators (20 using freehand technique versus 20 MR-IOS-guided) with each operator inserting 10 needles into a geometric phantom. Technical efficacy was measured by comparing the success rates of needle insertions between the two operator groups. Operator performance was assessed by comparing total procedure times, total needle path distance, presumed tissue damage, and speed of individual insertions between the two operator groups.RESULTS: The MR-IOS maximally altered SNR by 2% with no perceptible change in image quality or uniformity. Accuracy assessment showed mean entry error of 1.6 ? 0.6 mm, depth error of 0.7 ? 0.5 mm, angle error of 1.5 ? 1.1?, and target error of 1.9 ? 0.8 mm. Technical efficacy showed a statistically significant difference (p?=?0.031) between success rates (freehand 35.0% vs. MR-IOS 80.95%). Operator performance showed: mean total procedure time of 40.3 ? 4.4 (s) for freehand and 37.0 ? 3.7 (s) for MR-IOS (p?=?0.584), needle path distances of 152.6 ? 15.0 mm for freehand and 116.9 ? 8.7 mm for MR-IOS (p =?0.074), presumed tissue damage of 7,417.2 ? 955.6 mm(2) for freehand and 6062.2 ? 678.5 mm(2) for MR-IOS (p?=?0.347), and speed of insertion 5.9 ? 0.4 mm/s for freehand and 4.3 ? 0.3 mm/s for MR-IOS (p?=?0.003).CONCLUSION: The MR-IOS is compatible within a clinical MR imaging environment, accurate for needle placement, technically efficacious, and improves operator performance over the unassisted insertion technique. The MR-IOS was found to be suitable for further testing in a clinical setting.

Resumo Limpo

rpose clinic augment realiti guidanc system develop mriguid musculoskelet intervent magnet reson imag overlay system mrio purpos studi assess mri compat system accuraci technic efficaci oper perform mriosmethod materi impact mrio mr environ assess measur imag qualiti signaltonois ratio snr signal intens uniform system various onoff state system accuraci assess inroom preclin experi perform needl insert spine phantom expert oper measur entri depth angl target error technic efficaci oper perform test laboratori run experi novic oper use freehand techniqu versus mriosguid oper insert needl geometr phantom technic efficaci measur compar success rate needl insert two oper group oper perform assess compar total procedur time total needl path distanc presum tissu damag speed individu insert two oper groupsresult mrio maxim alter snr percept chang imag qualiti uniform accuraci assess show mean entri error mm depth error mm angl error target error mm technic efficaci show statist signific differ p success rate freehand vs mrio oper perform show mean total procedur time s freehand s mrio p needl path distanc mm freehand mm mrio p presum tissu damag mm freehand mm mrio p speed insert mms freehand mms mrio pconclus mrio compat within clinic mr imag environ accur needl placement technic efficaci improv oper perform unassist insert techniqu mrio found suitabl test clinic set

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