Tube focal spot size and power capability impact image quality in the evaluation of intracoronary stents

Erdogan Cesmeli; Joel L. Berry; J. Jeffrey Carr

doi:10.1117/12.596035

20 April 2005 Tube focal spot size and power capability impact image quality in the evaluation of intracoronary stents

Erdogan Cesmeli, Joel L. Berry, J. Jeffrey Carr

Proceedings Volume 5745, Medical Imaging 2005: Physics of Medical Imaging; (2005) https://doi.org/10.1117/12.596035
Event: Medical Imaging, 2005, San Diego, California, United States

Abstract

Proliferation of coronary stent deployment for treatment of coronary heart disease (CHD) creates a need for imaging-based follow-up examinations to assess patency. Technological improvements in multi-detector computer tomography (MDCT) make it a potential non-invasive alternative to coronary catheterization for evaluation of stent patency; however, image quality with MDCT varies based on the size and composition of the stent. We studied the role of tube focal spot size and power in the optimization of image quality in a stationary phantom. A standard uniform physical phantom with a tubular insert was used where coronary stents (4 mm in diameter) were deployed in a tube filled with contrast to simulate a typical imaging condition observed in clinical practice. We utilized different commercially available stents and scanned them with different tube voltage and current settings (LightSpeed Pro¹⁶, GE Healthcare Technologies, Waukesha, WI, USA). The scanner used different focal spot size depending on the power load and thus allowed us to assess the combined effect of the focal spot size and the power. A radiologist evaluated the resulting images in terms of image quality and artifacts. For all stents, we found that the small focal spot size yielded better image quality and reduced artifacts. In general, higher power capability for the given focal spot size improved the signal-to-noise ratio in the images allowing improved assessment. Our preliminary study in a non-moving phantom suggests that a CT scanner that can deliver the same power on a small focal spot size is better suited to have an optimized scan protocol for reliable stent assessment.

Citation Download Citation

Erdogan Cesmeli, Joel L. Berry, and J. Jeffrey Carr "Tube focal spot size and power capability impact image quality in the evaluation of intracoronary stents", Proc. SPIE 5745, Medical Imaging 2005: Physics of Medical Imaging, (20 April 2005); https://doi.org/10.1117/12.596035

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KEYWORDS

Image quality

Computed tomography

Scanners

Signal attenuation

Medicine

Image analysis

Visualization

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