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Image reconstruction and performance evaluation for ECG-gated spiral scanning with a 16-slice CT system
Th Flohr1, B Ohnesorge, H Bruder
1Siemens Medical Solutions, Computed Tomography, Forchheim, Germany. thomas.flohr@siemens.com
Medical Physics
|November 5, 2003
Summary
This study introduces an improved cardiac CT imaging method using Adaptive Cardio Volume (ACV) reconstruction for 16-slice scanners. The technique enhances visualization of coronary arteries, stents, and plaques, even at higher heart rates.
Area of Science:
- Medical Imaging
- Radiology
- Cardiovascular CT
Background:
- ECG-gated cardiac spiral CT is crucial for visualizing heart structures.
- Advancements in CT technology, like 16-slice scanners, necessitate optimized reconstruction algorithms.
Purpose of the Study:
- To present and evaluate an Adaptive Cardio Volume (ACV) reconstruction approach for ECG-gated cardiac spiral scanning on 16-slice CT equipment.
- To assess image quality, spatial resolution, and temporal resolution for improved cardiac imaging.
Main Methods:
- Extension of the Adaptive Cardio Volume (ACV) reconstruction approach for multislice spiral scanning.
- Image z-reformation to control spiral slice width and optimize image quality.
- Evaluation of slice sensitivity profiles (SSPs), transverse resolution, and temporal resolution as a function of heart rate and gantry rotation time.
Main Results:
- The ACV approach with image reformation provides well-defined SSPs independent of heart rate.
- Sub-millimeter slice widths (0.75 mm collimated) achieve high spatial resolution (0.83 mm FWHM) and resolve small structures (0.6-0.7 mm).
- Optimal temporal resolution of 105 ms achieved with 0.42 s gantry rotation at 81 bpm, enabling imaging across a wider heart rate range.
Conclusions:
- ECG-gated cardiac CT with up to 16 slices does not require specialized cone-beam reconstruction when using the ACV approach.
- Reconstruction slice widths ≤1.5 mm are adequate for coronary artery visualization, with sub-mm slices significantly improving stent and calcification imaging.
- The 16-slice platform with ACV reconstruction offers potential for routine clinical cardiac imaging with sub-mm isotropic spatial resolution and short breath-hold times.