Artifacts in 3D rotational angiography. an experimental study

Abstract

The quality of the 3D reconstructions from RA was degraded by beam-hardening and sampling artifacts. The sampling artifacts were diminished by increasing both the rotation angle and the number of projections. The distortions in the 3D reconstructions caused by beam-hardening remain to be resolved. The threshold values also had a considerable influence on the 3D reconstructions.

Interobserver variability of aneurysm morphology: discrimination of the daughter sac

“…Another limitation was that the window settings of the 3D images in this study could not be adjusted by the readers. In fact, the threshold value for 3D reconstruction had a considerable influence on image quality 10. Finally, although DS-UCAS showed substantial agreement among readers, we did not demonstrate the clinical impact on the treatment strategy for UIAs.…”

“…This does not reflect the usual clinical situation where the full 3D dataset is generally available and can be manipulated. While 3D images had some fundamental variability in image quality due to technical and physiological limitations,10 the 3D images are generally superior as they have the advantage of a 360° view of the aneurysm using a volume rendered reconstruction method. Despite the limitations of the 3D images, the proportion of positive ratings on 3D images was higher than for the 2D images for all of the morphological features, except ‘lobulation’.…”

Comparison of 2D Digital Subtraction Angiography and 3D Rotational Angiography in the Evaluation of Dome-to-Neck Ratio

“…Adjustment of threshold values to 3DRA reconstructions has been shown to be important in providing optimal visibility of vascular structures, and it has been suggested that they be adjusted individually for individual cases. 17 However, the effects of changing threshold values on aneurysm treatment decisions have yet to be investigated.…”