Research Topics

Medical Imaging

Introduction

The use of 2D and 3D analysis for medical procedures is becoming more and more popular. Processing of X-Ray, CT (Computed Tomography), and MRI (Magnetic Resonance Imaging) into 3D models are just the beginning. New techniques are enabling full anatomical representations, pre/post operative analysis, intra-operative information systems and so on. Additional information, simpler procedures and improved analysis can improve patient health, diagnose problems faster, and shift patients from being in-patients (with the health issues and costs associated), to out-patients - reducing the financial burden on health systems, improving patient recovery, and allowing patients to feel more relaxed in their home environment.

In this area of research, I am focused on two topics:

  • Femoral-Acetabular Impingement ~ dealing with a common orthopedic problem by looking at methods to simulate the interaction between the acetabular socket, and the femoral head


  • Virtual Surgery Simulation ~ providing a simulation environment that permits interns for endoscopics surgery train in an environment as close as possible to the real thing

Femoral-Acetabular Impingement

"Femoro-Acetabular impingement (FAI) is a common cause of hip pain" due to the abnormal joint shape [1, 2]. "Morphologic abnormalities in the femoral head neck junction or the acetabulum lead to abnormal contact forces occurring during extremes of hip motion" [1, 2]. We are motivated by the medical needs of FAI impingement detection for distance parameters. In the preoperative correction simulation, detecting the impinged regions of the joint and estimating the impingement level are our main goals in order to determine the location and amount of the correction required.

Detecting the position and the level of joint impingement is often a key to computer-aided surgical plan to normalize joint kinematics. So far most of the current impingement detection methods for ball-and-socket joint are not efficient or only report a few collided points as the detection results. Our research has lead to the devlepment of a novel real-time impingement detection system with rapid memory-efficient uniform sampling and surface-to-surface distance measurement feature to estimate the overall impingement.

Femoral Head Our system describes near-spherical objects in spherical coordinate system, which reduces the space complexity and the computation costs. The sampling design further reduces the memory cost by generating uniform sampling orientations. The rapid and accurate impingement detection with surface-to-surface distance measurement can provide more realistic detailed information to estimate the overall impingement on the ball-and-socket joint, which is particularly useful for computer-aided surgical plan.

Virtual Surgery Simulation

  • [1] Ganz R, Parvizi J, Beck M, Leunig M, Notzli H, Siebenrock KA (2003) Femo-roacetabular Impingement: A cause for osteoarthritis of the hip. Clinical Ortho-paedics and Related Research, No. 417, pp.112-120
  • [2] Wisniewski SJ, Grogg B (2006) Femoroacetabular Impingement: An overlooked cause of hip pain. American Journal of Physical Medicine and Rehabilitation, Vol. 85, pp. 546-549