University of Twente Student Theses
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Towards personalized trocar placement : analysis and simulation of patient-specific abdominal wall distension due to pneumoperitoneum
Gritter, S.T. (2025) Towards personalized trocar placement : analysis and simulation of patient-specific abdominal wall distension due to pneumoperitoneum.
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| Full Text Status: | Access to this publication is restricted |
| Abstract: | Abdominal surgery impacts patients significantly, but minimally invasive techniques can reduce recovery time and complications. Success in such procedures relies heavily on optimal trocar placement, which is complex, especially in robot-assisted surgery, and currently guided only by generic protocols. These do not account for individual abdominal shapes or the effects of pneumoperitoneum-induced distension. This thesis aims to enable personalized trocar placement by analyzing and simulating patient-specific abdominal wall distension. Using RGB-D cameras, 3D abdominal reconstructions were captured from 65 patients before and after insufflation. Displacement of ink landmarks marked by surgeons quantified distension, which had a mean of 3.6 ± 0.9 cm and varied significantly with age, height, and abdominal region. A simulation model using PointNeXt architecture was trained to predict distension from pre-insufflation shape and patient data. Neural ODEs generated deformation fields to supervise the model, achieving a Chamfer distance of 0.1 cm and a TRE of 0.8 cm. The PointNeXt model achieved 1.0 cm Chamfer distance and 1.6 cm TRE. This work introduces a novel data-driven approach to predict patient-specific abdominal wall distension, laying the groundwork for personalized trocar placement systems. |
| Item Type: | Essay (Master) |
| Faculty: | TNW: Science and Technology |
| Subject: | 44 medicine, 50 technical science in general |
| Programme: | Technical Medicine MSc (60033) |
| Link to this item: | https://purl.utwente.nl/essays/107613 |
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