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Temporal resolution improvement in cardiac CT using PICCS (TRI-PICCS): performance studies.

Jie Tang¹, Jiang Hsieh, Guang-Hong Chen

¹Department of Medical Physics, University of Wisconsin-Madison, 53705, USA.

Medical Physics

|October 1, 2010

Summary

The temporal resolution improvement using PICCS (TRI-PICCS) method enhances cardiac MDCT imaging by a factor of 2-2.3. Its performance is robust across various motion patterns and heart rates up to 100 bpm.

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Area of Science:

Medical Imaging
Image Reconstruction
Cardiovascular Imaging

Background:

Cardiac MDCT imaging requires high temporal resolution for accurate motion artifact reduction.
Prior Image Constrained Compressed Sensing (PICCS) is a novel method for improving image quality.
Temporal resolution improvement using PICCS (TRI-PICCS) aims to enhance cardiac MDCT temporal resolution.

Purpose of the Study:

To evaluate the relationship between TRI-PICCS performance and projection data angular range.
To assess TRI-PICCS performance concerning object motion orientations and patterns.
To determine the impact of varying heart rates on TRI-PICCS algorithm efficacy.

Main Methods:

A hybrid phantom with simulated coronary arteries and realistic cardiac anatomy was utilized.
Projection data from a cardiac MDCT scan were combined with analytical data of moving vessels.
TRI-PICCS was applied using varying angular ranges and motion profiles to assess performance metrics like signal deficit and motion artifacts.

Main Results:

TRI-PICCS performance remained consistent with projection data angular ranges from 100 to 120 degrees.
Algorithm performance was independent of motion location and orientation.
Performance was maintained for heart rates up to 100 bpm with a 350 ms gantry rotation speed.

Conclusions:

TRI-PICCS effectively improves temporal resolution in MDCT cardiac imaging by 2-2.3 times.
The method demonstrates insensitivity to motion location and orientation, enhancing its applicability.
TRI-PICCS facilitates scanning of patients with heart rates up to 100 bpm using MDCT scanners with 350 ms or faster gantry speeds.