Derek Gould

Publications (34) View all

• Article: Simulation of endovascular guidewire behaviour and experimental validation.

  Vincent Luboz, Jianhua Zhai, Tolu Odetoyinbo, Peter Littler, Derek Gould, Thien How, Fernando Bello
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  ABSTRACT: Guidewire manipulation is a core skill in endovascular interventional radiology procedures. Simulation-based training offers a valuable alternative for mastering these skills, but requires a faithful replication of complex guidewire behaviour inside the vasculature. This paper presents the integration of real flexural modulus (FM) measurements into our guidewire model that mimics the flexibility of standard guidewires. The variation of FM along the length of each wire was determined for seven commonly used guidewires using a three-point bending test for the main body and a two-point bending test for the flexible end. Guidewire FM values were then attributed to seven different models, each formed by a series of particles connected by links of variable FM and replicating the flexible end shape. The FM integration was done through a trial and error process matching real FM to virtual bending coefficient. This mass-spring representation captures the required range of behaviour and enables accurate deformation within virtual vasculature.
  Computer Methods in Biomechanics and Biomedical Engineering 02/2011; 14(6):515-20. · 0.85 Impact Factor
• Article: Guidewire and catheter behavioural simulation.

  Vincent Luboz, Jianhua Zhai, Tolu Odetoyinbo, Peter Littler, Derek Gould, Thien How, Fernando Bello
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  ABSTRACT: Guidewire and catheter manipulation is a core skill in endovascular interventional radiology. It is usually acquired in an apprenticeship on patients, but this training is expensive and risky. Simulation offers an efficient alternative for core skills training, though the instrument complex behaviour requires accurate replication. This paper reviews the mass-spring model used to simulate seven guidewires and three catheters, and the matching with their real world counterparts by tuning our model's bending coefficient, which allows replication of the instrument flexibility. This coefficient was matched through computed tomography imaging of a vascular phantom in which each instrument was inserted and manipulated. With an average distance of 2.27 mm (standard deviation: 1.54) between real and virtual instruments, our representation showed realistic behaviour.
  Studies in health technology and informatics 01/2011; 163:317-23.
• Article: Segmentation of 3D vasculatures for interventional radiology simulation.

  Yi Song, Vincent Luboz, Nizar Din, Daniel King, Derek Gould, Fernando Bello, Andy Bulpitt
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  ABSTRACT: Training in interventional radiology is slowly shifting towards simulation which allows the repetition of many interventions without putting the patient at risk. Accurate segmentation of anatomical structures is a prerequisite of realistic surgical simulation. Therefore, our aim is to develop a generic approach to provide fast and precise segmentation of various virtual anatomies covering a wide range of pathology, directly from patient CT/MRA images. This paper presents a segmentation framework including two segmentation methods: region model based level set segmentation and hierarchical segmentation. We compare them to an open source application ITK-SNAP which provides similar approaches. The subjective human influence such as inconsistent inter-observer errors and aliasing artifacts etc. are analysed. The proposed segmentation techniques have been successfully applied to create a database of various anatomies with different pathologies, which is used in computer-based simulation for interventional radiology training.
  Studies in health technology and informatics 01/2011; 163:599-605.
• Conference Proceeding: Endovascular Guidewire Flexibility Simulation.

  Vincent Luboz, Jianhua Zhai, Peter Littler, Tolu Odetoyinbo, Derek Gould, Thien How, Fernando Bello
  Biomedical Simulation, 5th International Symposium, ISBMS 2010, Phoenix, AZ, USA, January 23-24, 2010. Proceedings; 01/2010
• Article: A realistic elastic rod model for real-time simulation of minimally invasive vascular interventions.

  Wen Tang, Pierre Lagadec, Derek Gould, Tao Ruan Wan, Jianhua Zhai, Thien How
  The Visual Computer. 01/2010; 26:1157-1165.