MR to ultrasound registration for image-guided prostate interventions

作者：Hu Yipeng^*; Ahmed Hashirn Uddin; Taylor Zeike; Allen Clare; Emberton Mark; Hawkes David; Barratt Dean

来源：Medical Image Analysis, 2012, 16(3): 687-703.

DOI：10.1016/j.media.2010.11.003

• Image registration
• Biomechanical modelling
• Statistical shape modelling
• Minimum-invasive interventions
• Prostate cancer

A deformable registration method is described that enables automatic alignment of magnetic resonance (MR) and 3D transrectal ultrasound (TRUS) images of the prostate gland. The method employs a novel "model-to-image" registration approach in which a deformable model of the gland surface, derived from an MR image, is registered automatically to a TRUS volume by maximising the likelihood of a particular model shape given a voxel-intensity-based feature that represents an estimate of surface normal vectors at the boundary of the gland. The deformation of the surface model is constrained by a patient-specific statistical model of gland deformation, which is trained using data provided by biomechanical simulations. Each simulation predicts the motion of a volumetric finite element mesh due to the random placement of a TRUS probe in the rectum. The use of biomechanical modelling in this way also allows a dense displacement field to be calculated within the prostate, which is then used to non-rigidly warp the MR image to match the TRUS image. Using data acquired from eight patients, and anatomical landmarks to quantify the registration accuracy, the median final RMS target registration error after performing 100 MR-TRUS registrations for each patient was 2.40 mm.

• 出版日期2012-4