The Study of Nonlinear Change of Bladder During Urinary Store Based on MRI

It is significant to monitor bladder volume continuously and accurately in many specific clinical conditions or during treatment or management of urological disorders. This study try to explore the dynamic bladder storing process and understand the change of bladder shape and intra-vesical volume under the specific conditions of water-drinking using reconstructed three-dimension (3D) bladder models based on magnetic resonance imaging (MRI). A 3T GE MRI system was used to acquire bladder images while storing in the transverse section. Segmentation of the bladder MRI image, 3D model reconstruction, and volume measurement in different scan phases were performed with Mimics software. The results showed that the bladder varied from small bowl-like shape to irregular ellipsoid during urinary store. The increase in bladder volume was nonlinear under the specific conditions of water-drinking. The diameter change of the bladder in different directions was inconsistent during urinary store.