DSAにおける血管径計測法の開発

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purpose: To devise a new calibration method to measure intracranial aneurysm size on digital subtraction angiograms. Methods: Calibration planes were independently established at the upper and lower sides of a rotation center of the C-arm, and a calibration scale was placed in one of two calibration planes. One pair of digital subtraction angiograms of the aneurysm is taken from different rotation angles of the C-arm. The projection size of the aneurysm on the calibration plane and the three-dimensional coordinates of the aneurysm are calculated with a calibration scale from these angiograms. Thus, the aneurysm's size is calculated from the geometrical arrangement of the DSA system. To examine precision, we measured the size of seven vessel phantoms (caliber 1.77-12.00 mm) by both the catheter method and the new calibration method. Clinically, the digital subtraction angiograms of 22 cerebral aneurysms treated by endovascular occlusion with the Gugliclmi detachable coil were analyzed by the new calibration method. Results: The new calibration method correlated well with the catheter method (y=0.9726_x+0.0023,R^2=1). The error of the catheter method was 4.40%±3.29% (n=245), while that of the new calibration method was 3.63%±2.14% (n=1470), indicating that the new calibration method was significantly more precise (p<0.0001). It was found that aneurysmal size measured by the new calibration method correlated well with the maximum diameter of the Guglielmi detachable coil. Conclusion: Accurate digital subtraction angiographic measurements of intracranial aneurysm size could be obtained in most aneurysms. The measurements of intracranial aneurysm size measured by the new calibration method are highly useful as an index for the Guglielmi detachable coil technique.
社団法人日本放射線技術学会の論文
2001-02-20

DSAにおける血管径計測法の開発

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