This application is for a Continuation (Renewal) of our RO1-44-PRJ68DN1 (4D DSA and 4D Fluoroscopy: Validation of Diagnostic and Therapeutic Capabilities). The proposed research is focused on developing and testing new methods that add further utility to 4D DSA and 4D fluoroscopy. To accomplish these innovations we have defined 3 tasks: 1)test and implement ways in which the temporal information contained in a 4D DSA can be validated and utilized to quantify blood flow, 2)optimize and test methods that would allow a reduction in the x-ray exposure required for a 4D DSA acquisition and, 3)test, optimize and implement on a commercial angiographic system a 4D fluoroscopy application which will allow accurate, real time reconstruction of devices, embed them in a 3D volume and then create virtual fluoroscopic views at any desired viewing angle with no need for gantry movement. Complementing the virtual fluoroscopic views will be endoscopic views showing the intraluminal position of the device in question. To accomplish these tasks three Specific Aims are proposed.
Specific Aim 1 : further improvement, validation and optimization of the 4D DSA reconstruction algorithm to improve quantitation.
Specific Aim 2 : development, testing, testing and validation of the use of a very low dose mask for a 4D DSA acquisition.
Specific Aim 3 : further development of the 4D Fluoroscopy technique. As detailed in the Research Strategy section of the application each of these Specific Aims will include phantom, animal and human subject studies.

Public Health Relevance

In this application we propose to develop and investigate methods to increase the utility of the 4D DSA method that has recently been commercially introduced. The presently available method does not provide quantitative information on blood velocity and blood flow. We are proposing methods to generate color-coded velocity and flow displays generated from the 4D DSA temporal information. We also propose methods for reducing the required 4D DSA dose by almost a factor of two. Finally we will implement an improved 4D Fluoroscopy method and develop a clinically acceptable user interface and workflow design.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
5R01HL116567-06
Application #
9441031
Study Section
Special Emphasis Panel (ZRG1)
Program Officer
Danthi, Narasimhan
Project Start
2013-02-01
Project End
2020-01-31
Budget Start
2018-02-01
Budget End
2020-01-31
Support Year
6
Fiscal Year
2018
Total Cost
Indirect Cost
Name
University of Wisconsin Madison
Department
Physics
Type
Schools of Medicine
DUNS #
161202122
City
Madison
State
WI
Country
United States
Zip Code
53715
Wu, Y; Shaughnessy, G; Hoffman, C A et al. (2018) Quantification of Blood Velocity with 4D Digital Subtraction Angiography Using the Shifted Least-Squares Method. AJNR Am J Neuroradiol 39:1871-1877
Shaughnessy, Gabe; Schafer, Sebastian; Speidel, Michael A et al. (2018) Measuring blood velocity using 4D-DSA: A feasibility study. Med Phys 45:4510-4518
Sandoval-Garcia, C; Yang, P; Schubert, T et al. (2017) Comparison of the Diagnostic Utility of 4D-DSA with Conventional 2D- and 3D-DSA in the Diagnosis of Cerebrovascular Abnormalities. AJNR Am J Neuroradiol 38:729-734
Sandoval-Garcia, Carolina; Royalty, Kevin; Yang, Pengfei et al. (2016) 4D DSA a new technique for arteriovenous malformation evaluation: a feasibility study. J Neurointerv Surg 8:300-4
Davis, Brian J; Oberstar, Erick; Royalty, Kevin et al. (2016) Volumetric limiting spatial resolution analysis of four-dimensional digital subtraction angiography. J Med Imaging (Bellingham) 3:013503
Hatt, Charles R; Wagner, Martin; Raval, Amish N et al. (2016) Dynamic tracking of prosthetic valve motion and deformation from bi-plane x-ray views: feasibility study. Proc SPIE Int Soc Opt Eng 9786:
Wagner, Martin; Schafer, Sebastian; Strother, Charles et al. (2016) 4D interventional device reconstruction from biplane fluoroscopy. Med Phys 43:1324-34
Wagner, Martin; Yang, Pengfei; Schafer, Sebastian et al. (2015) Noise reduction for curve-linear structures in real time fluoroscopy applications using directional binary masks. Med Phys 42:4645-53