Using three-dimensional ultrasound images adapted for the Virtual Organ Computer-aided AnaLysis method, foetal urinary bladder volumes can also be estimated using the SUM-OF-CYLINDERS method. The SUM-OF-CYLINDERS method employs technical advances which may result in a lower standard deviation and therefore higher intra-observer repeatability.
In view of the current technical limitations, an aberration from the circular shape may not be discernible. For this reason, the transverse shape of the fetal urinary bladder can be regarded as a circle. This means that, for bladder volume estimation, only an appropriate longitudinal section is necessary.
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