Evaluation of Different Registration Algorithms to Reduce Motion Artifacts in CT-Thermography (CTT)

Author:

Kostyrko Bogdan1ORCID,Rubarth Kerstin23ORCID,Althoff Christian1,Zibell Miriam4ORCID,Neizert Christina Ann4,Poch Franz4,Torsello Giovanni Federico1,Gebauer Bernhard1,Lehmann Kai4,Niehues Stefan Markus1ORCID,Mews Jürgen5,Diekhoff Torsten1ORCID,Pohlan Julian13ORCID

Affiliation:

1. Department of Radiology, Charité—Universitätsmedizin Berlin, Humboldt-Universität zu Berlin, Freie Universität Berlin, 10117 Berlin, Germany

2. Institute for Biometry and Clinical Epidemiology, Charité—Universitätsmedizin Berlin, Humboldt-Universität zu Berlin, Freie Universität Berlin, 10117 Berlin, Germany

3. Berlin Institute of Health, Charité—Universitätsmedizin Berlin, Humboldt-Universität zu Berlin, Freie Universität Berlin, 10178 Berlin, Germany

4. Department of General and Visceral Surgery, Charité—Universitätsmedizin Berlin, Humboldt-Universität zu Berlin, Freie Universität Berlin, 12203 Berlin, Germany

5. Canon Medical Systems Europe BV, Global Research & Development Center, 2718 RP Zoetermeer, The Netherlands

Abstract

Computed tomography (CT)-based Thermography (CTT) is currently being investigated as a non-invasive temperature monitoring method during ablation procedures. Since multiple CT scans with defined time intervals were acquired during this procedure, interscan motion artifacts can occur between the images, so registration is required. The aim of this study was to investigate different registration algorithms and their combinations for minimizing inter-scan motion artifacts during thermal ablation. Four CTT datasets were acquired using microwave ablation (MWA) of normal liver tissue performed in an in vivo porcine model. During each ablation, spectral CT volume scans were sequentially acquired. Based on initial reconstructions, rigid or elastic registration, or a combination of these, were carried out and rated by 15 radiologists. Friedman’s test was used to compare rating results in reader assessments and revealed significant differences for the ablation probe movement rating only (p = 0.006; range, 5.3–6.6 points). Regarding this parameter, readers assessed rigid registration as inferior to other registrations. Quantitative analysis of ablation probe movement yielded a significantly decreased distance for combined registration as compared with unregistered data. In this study, registration was found to have the greatest influence on ablation probe movement, with connected registration being superior to only one registration process.

Funder

Canon Medical System

Master research agreement

Publisher

MDPI AG

Subject

Clinical Biochemistry

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