Summary
Objectives:
The volumetric assessment of anatomical cavities is of high relevance for various
applications in medicine. Based on 3D scanning (i.e., CT) of these cavities, the volume
can be determined by counting the volume elements of a segmentation of that cavity.
Unfortunately, elements on the boundary of the segmentation require special treatment
to obtain accurate volumetric measurements. In this paper, we propose a novel technique
that in particular increases the accuracy of the volume estimation for the boundary
elements of segmented anatomical objects.
Methods:
Based on a 3D segmentation of an anatomical cavity, we recursively subdivide boundary
volume elements into a set of simple situations, where the volume can be estimated
easily.
Results:
We performed volumetric measurements on seven datasets of phantom models made of
plexiglass (see Fig. 1) scanned by a biplane angiography unit and assessed the quality
of our method by comparing the measured volume by our novel method and by the fluid
required to fill the phantom cavities.
Conclusions:
Our method calculates a significantly more accurate volume of the segmented cavities
than previous methods. Nevertheless, it is only slightly more computationally expensive.
Keywords
Radiographic phantom - angiography - measurements - quality assessment
