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Increasing spatial resolution through automated catheter rotation in high definition urethral pressure profilometry

Urethral pressure profilometry (UPP) is a tool in the diagnosis of stress urinary incontinence. The pressure profile on the urethra's inside is measured by a catheter with pressure sensing capability to assess the contraction strength of the sphincter muscle. In order to improve this diagnostic method, high definition urethral pressure profilometry (HD-UPP) combining enhanced UPP hardware and signal processing algorithms has been developed. From HD-UPP data, a high resolution pressure image is reconstructed on the urethra's inside. In this contribution, we investigate how the spatial resolution can be increased through automated catheter rotation during retraction. As catheter rotation has an adverse effect on the amplification of measurement errors in signal reconstruction, we additionally present a method to optimize sensor positions on the catheter for optimal reconstruction stability in presence of catheter rotation. Finally, it is shown that through automated catheter rotation the same resolution as with an additional pressure sensor and non-rotating catheter retraction can be achieved at no extra cost.