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Proceedings Paper

Error analysis for a navigation system using 3D abdominal ultrasound
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Paper Abstract

Purpose We present a systematic error analysis for a navigation system which allows image fusion between two arbitrary image modalities. A prototype was built for prostate biopsies merging pre-operative magnetic resonance images (MRI) with interventional 3D free-hand transrectal US (TRUS). Methods The fusion between MRI and TRUS images was performed by replacing the inter-modal MRI-TRUS registration by an intra-modal 3D/3D-US/TRUS registration and a pre-operative image fusion between MRI and 3D(-abdominal)-US using an optical tracking system (OTS). The error of the inter-modal MRI/3D(-abdominal)- US image fusion was evaluated using a multi-cone phantom and a prostate phantom by calculating a target registration error (TRE) and the Dice score of segmented lesions (radius 5 mm) from the prostate phantom. The pre-operative 3D(-abdominal)-US was then registered with the TRUS images and the TRE error was calculated. Finally, a Dice score of segmented lesions between TRUS and MRI was determined. Results The fiducial registration error for the 3D(-abdominal)-US and TRUS calibration resulted in 0:87 mm and 1:18 mm, respectively. The TRE for the 3D abdominal transducer was 1:08 mm. The TRE of the MRI/3D- US image fusion using a multi-cone phantom was 1:81 mm. The Dice-score calculated from test lesions segmented in MRI and TRUS resulted in an error of 0.67. The TRE between the 3D-US and the TRUS was 2:10 mm. The Dice score from segmented lesions in MRI and TRUS was 0:67. Conclusions The intra-modal registration via OTS between MRI and TRUS images showed sufficient accuracy for prostate biopsy.

Paper Details

Date Published: 16 March 2020
PDF: 7 pages
Proc. SPIE 11315, Medical Imaging 2020: Image-Guided Procedures, Robotic Interventions, and Modeling, 113151Z (16 March 2020); doi: 10.1117/12.2548866
Show Author Affiliations
David Iommi, Medizinische Univ. Wien (Austria)
Alejandra Valladares, Medizinische Univ. Wien (Austria)
Michael Figl, Medizinische Univ. Wien (Austria)
Johann Hummel, Medizinische Univ. Wien (Austria)

Published in SPIE Proceedings Vol. 11315:
Medical Imaging 2020: Image-Guided Procedures, Robotic Interventions, and Modeling
Baowei Fei; Cristian A. Linte, Editor(s)

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