Reconstruction of blood vessels from an insufficient number of projections obtained from venography

Ohishi, Satoru; Haneishi, Hideaki; Yamaguchi, Masahiro; Ohyama, Nagaaki; Honda, Toshio

doi:10.1016/0030-4018(93)90416-3

Cited by 1 publication

(1 citation statement)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If a radiologist or a neurosurgeon carries out a mental reconstruction of the cranio-vascular system from biplane images, he integrates a-priori knowledge in order to recognise 3-d structures. Computer assisted 3-d reconstruction methods for subtracted or non-subtracted biplane angiography are investigated for several years 4,5,6,7,8 , but -except for some preliminary work 9,10 -capabilities of biplane angiography are still not fully explored in computer assisted surgical planning.…”

Section: Introductionmentioning

confidence: 99%

<title>Accuracy of distance measurements in biplane angiography</title>

et al. 1997

View full text Add to dashboard Cite

Distance measurements of the vascular system of the brain can be derived from biplanar digital subtraction angiography (2p-DSA). The measurements are used for planning of minimal invasive surgical procedures. Our 90°-fixed-angle G-ring angiography system has the potential of acquiring pairs of such images with high geometric accuracy. The sizes of vessels and aneurysms are estimated applying a fast and accurate extraction method in order to select an appropriate surgical strategy. Distance computation from 2p-DSA is carried out in three steps. First, the boundary of the structure to be measured is detected based on zero-crossings and closeness to user-specified end points. Subsequently, the 3-d location of the centre of the structure is computed from the centres of gravity of its two projections. This location is used to reverse the magnification factor caused by the cone-shaped projection of the x-rays. Since exact measurements of possibly very small structures are crucial to the usefulness in surgical planning, we identified mechanical and computational influences on the geometry which may have an impact on the measurement accuracy. A study with phantoms is presented distinguishing between the different effects and enabling the computation of an optimal overall exactness. Comparing this optimum with results of distance measurements on phantoms whose exact size and shape is known, we found, that the measurement error for structures of size of 20 mm (the maximum size for structures to be measured) was less than 0.05 mm on average and 0.50 mm at maximum. The maximum achievable accuracy of 0.15 mm was in most cases exceeded by less than 0.15 mm. This accuracy surpasses by far the requirements for the above mentioned surgery application. The mechanic accuracy of the fixed-angle biplanar system meets the requirements for computing a 3-d reconstruction of the small vessels of the brain. It also indicates, that simple measurements will be possible on systems being less accurate.

show abstract