Photon-counting CT: how the next generation of scanners will change cardiac imaging

The transition from conventional energy-integrating detectors to photon-counting detectors (PCD) represents the most significant advancement in CT technology since the introduction of multi-slice scanners.

For cardiac imaging specifically, PCD-CT offers three transformative capabilities: spectral separation without dual-source hardware, spatial resolution below 0.2mm enabling visualization of coronary stent lumens, and radiation dose reductions of 40-60% compared to current-generation cardiac CT protocols.

Early clinical experience from centers in Germany, Japan, and now India — where Apollo Hospitals Chennai recently installed the first photon-counting cardiac CT system in South Asia — suggests that the technology particularly excels at myocardial perfusion imaging and coronary calcium scoring.

"We are seeing coronary plaque characterization that was previously only possible with invasive IVUS," reported Dr. Meena Krishnamurthy, Head of Cardiac Imaging at Apollo Chennai. "The clinical implications for pre-procedural planning are enormous."