X-ray or gamma ray systems or devices – Electronic circuit – With display or signaling
Patent
1998-01-27
2000-06-13
Bruce, David V.
X-ray or gamma ray systems or devices
Electronic circuit
With display or signaling
378 17, 378901, A61B 600, A61B 603
Patent
active
060758368
ABSTRACT:
A method of and system for performing intravenous tomographic digital angiography imaging which combines the principles of intravenous digital angiography with those of cone-beam volume tomography for generating a direct, unambiguous and accurate 3-D reconstruction of stenosis and other irregularities and malformations from 2-D cone-beam tomography projections is disclosed in which several different data acquisition geometries, such as a circle-plus-arc data acquisition geometry, may be utilized to provide a complete set of data so that an exact 3-D reconstruction is obtained. Only a single IV contrast injection with a short breathhold by the patient is needed for use with a volume CT scanner which uses a cone-beam x-ray source and a 2-D detector for fast volume scanning in order to provide true 3-D descriptions of vascular anatomy with more than 0.5 lp/mm isotropic resolution in the x, y and z directions is utilized in which one set of cone-beam projections is acquired while rotating the x-ray tube and detector on the CT gantry and then another set of projections is acquired while tilting the gantry by a small angle. The projection data is preweighted and the partial derivatives of the preweighted projection data are calculated. Those calculated partial derivatives are rebinned to the first derivative of the Radon transform, for both the circular orbit data and the arc orbit data. The second partial derivative of the Radon transform is then calculated and then the reconstructed 3-D images are obtained by backprojecting using the inverse Radon transform.
REFERENCES:
patent: 5257183 (1993-10-01), Tam
patent: 5365560 (1994-11-01), Tam
patent: 5390226 (1995-02-01), Tam
patent: 5461650 (1995-10-01), Tam
patent: 5671265 (1997-09-01), Andress
patent: 5802133 (1998-09-01), Kawai et al.
Bruce D. Smith, "Image Reconstruction from Cone-Beam Projections: Necessary and Sufficient Conditions and Reconstruction Methods" IEEE Transactions on Medical Imaging, vol. M1-4, No. 1, Mar. 1985, pp 14-25.
Bruce David V.
University of Rochester
LandOfFree
Method of and system for intravenous volume tomographic digital does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of and system for intravenous volume tomographic digital , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of and system for intravenous volume tomographic digital will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2075707