Sampling lattice and signal reconstruction in urodynamics

Urethral pressure profilometry is a tool in the diagnosis of urinary incontinence. The pressure profile along the urethra is measured by a special catheter in order to asses the contraction strength of the sphincter muscle. However, the diagnostic value of pressure profilometry is limited. We seek to increase the diagnostic value by providing a detailed spatial reconstruction of the pressure profile on the surface of the urethra. Therefore, we investigate the sampling lattice (i.e., spatial sample distribution) and its properties with respect to signal reconstruction depending on the catheter´s sensor configuration and retraction motion. A sampling lattice with beneficial properties for reconstruction is generated through downsampling and a coordinate transformation of the original samples. We investigate its stability properties and present a reconstruction algorithm for the two-dimensional pressure distribution. Simulation results for signal reconstruction and stability properties conclude this work.