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Image Gated Cardiac CT
LSU Medical PhysicsSeminar
February 4, 2005Given by Will Hill
With advice from Dr. Kip Mathews
A presentation of“Automatic Phase Determination for Retrospectively Gated
Cardiac CT” fromthe December 2004 issue of Medical Physics
Introduction and Objectives
What is Gated Cardiac Computed Tomography (CT) ?
Why bother? What This Lecture will cover:
Basics of CT Basics of cardiac timing How this is done now How the author did it The author's results
Literature Review
“Automatic Phase Determination for Retrospectively Gated Cardiac CT,” by R. Manzke, Th. Kohler, T. Neilsen, D. Hawkes and M. Grass, Medical Physics 31-12.
The Essential Physics of Medical Imaging, Lippncott Williams and Wilkins, Second Edition.
The Basics of Computed Tomography
Who Likes Guessing Games?
The Basics of Computed Tomography
How about this one?
The Basics of Computed Tomography
Pretend you can't see through it.
The Basics of Computed Tomography
and that you have x-rays and a counter.
The Basics of Computed Tomography
Ta-dah!
The Basics of Computed Tomography
So, that's how it works.
Timing: Your Heart
Timing: Your Heart
Timing: EKG Methods Triggered Continuous
Materials and Method
This Method: Low Pitch Helical Cardiac Scan and ECG Reconstruction of Low-Resolution 4D Volume Automatic Motion Calculations Reconstruction of High Resolution Volumes
Philips MX 8000 IDT 16-line CT system at University Hospital in Ulm, Germany and at the Carmel Hospital in Haifa, Israel.
Similar Low Resolution Volumes
Motion Determination
Motion Map
Results
Simulation Study Three Patient's Data
Conclusions
Computational Efficiency similarity is easy low resolution scans are used first
Automatically Reduces Motion Artifacts patient and cycle variation are accounted for different phases can be used for different heart
segments by use of new motion maps
The Future
Authors promise larger clinical trials.