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Image Gated Cardiac CT LSU Medical Physics Seminar February 4, 2005 Given by Will Hill With advice from Dr. Kip Mathews A presentation of “Automatic Phase Determination for Retrospectively Gated Cardiac CT” from the December 2004 issue of Medical Physics

Image Gated Cardiac CT LSU Medical Physics Seminar February 4, 2005 Given by Will Hill With advice from Dr. Kip Mathews A presentation of “Automatic Phase

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Page 1: Image Gated Cardiac CT LSU Medical Physics Seminar February 4, 2005 Given by Will Hill With advice from Dr. Kip Mathews A presentation of “Automatic Phase

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

Page 2: Image Gated Cardiac CT LSU Medical Physics Seminar February 4, 2005 Given by Will Hill With advice from Dr. Kip Mathews A presentation of “Automatic Phase

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

Page 3: Image Gated Cardiac CT LSU Medical Physics Seminar February 4, 2005 Given by Will Hill With advice from Dr. Kip Mathews A presentation of “Automatic Phase

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.

Page 4: Image Gated Cardiac CT LSU Medical Physics Seminar February 4, 2005 Given by Will Hill With advice from Dr. Kip Mathews A presentation of “Automatic Phase

The Basics of Computed Tomography

Who Likes Guessing Games?

Page 5: Image Gated Cardiac CT LSU Medical Physics Seminar February 4, 2005 Given by Will Hill With advice from Dr. Kip Mathews A presentation of “Automatic Phase

The Basics of Computed Tomography

How about this one?

Page 6: Image Gated Cardiac CT LSU Medical Physics Seminar February 4, 2005 Given by Will Hill With advice from Dr. Kip Mathews A presentation of “Automatic Phase

The Basics of Computed Tomography

Pretend you can't see through it.

Page 7: Image Gated Cardiac CT LSU Medical Physics Seminar February 4, 2005 Given by Will Hill With advice from Dr. Kip Mathews A presentation of “Automatic Phase

The Basics of Computed Tomography

and that you have x-rays and a counter.

Page 8: Image Gated Cardiac CT LSU Medical Physics Seminar February 4, 2005 Given by Will Hill With advice from Dr. Kip Mathews A presentation of “Automatic Phase

The Basics of Computed Tomography

Ta-dah!

Page 9: Image Gated Cardiac CT LSU Medical Physics Seminar February 4, 2005 Given by Will Hill With advice from Dr. Kip Mathews A presentation of “Automatic Phase

The Basics of Computed Tomography

So, that's how it works.

Page 10: Image Gated Cardiac CT LSU Medical Physics Seminar February 4, 2005 Given by Will Hill With advice from Dr. Kip Mathews A presentation of “Automatic Phase

Timing: Your Heart

Page 11: Image Gated Cardiac CT LSU Medical Physics Seminar February 4, 2005 Given by Will Hill With advice from Dr. Kip Mathews A presentation of “Automatic Phase

Timing: Your Heart

Page 12: Image Gated Cardiac CT LSU Medical Physics Seminar February 4, 2005 Given by Will Hill With advice from Dr. Kip Mathews A presentation of “Automatic Phase

Timing: EKG Methods Triggered Continuous

Page 13: Image Gated Cardiac CT LSU Medical Physics Seminar February 4, 2005 Given by Will Hill With advice from Dr. Kip Mathews A presentation of “Automatic Phase

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.

Page 14: Image Gated Cardiac CT LSU Medical Physics Seminar February 4, 2005 Given by Will Hill With advice from Dr. Kip Mathews A presentation of “Automatic Phase

Similar Low Resolution Volumes

Page 15: Image Gated Cardiac CT LSU Medical Physics Seminar February 4, 2005 Given by Will Hill With advice from Dr. Kip Mathews A presentation of “Automatic Phase

Motion Determination

Page 16: Image Gated Cardiac CT LSU Medical Physics Seminar February 4, 2005 Given by Will Hill With advice from Dr. Kip Mathews A presentation of “Automatic Phase

Motion Map

Page 17: Image Gated Cardiac CT LSU Medical Physics Seminar February 4, 2005 Given by Will Hill With advice from Dr. Kip Mathews A presentation of “Automatic Phase

Results

Simulation Study Three Patient's Data

Page 18: Image Gated Cardiac CT LSU Medical Physics Seminar February 4, 2005 Given by Will Hill With advice from Dr. Kip Mathews A presentation of “Automatic Phase

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

Page 19: Image Gated Cardiac CT LSU Medical Physics Seminar February 4, 2005 Given by Will Hill With advice from Dr. Kip Mathews A presentation of “Automatic Phase

The Future

Authors promise larger clinical trials.