Principles and Clinical Applications of Photon Counting Computed Tomography

초록

Photon counting computed tomography (PCCT) represents a novel imaging technology that effectively addresses the inherent limitations of conventional CT systems through the utilization of energy integrated detectors (EID). The photon counting detector (PCD) within a PCCT is capable of directly generating an electrical signal proportional to the energy of the photons by utilizing semiconductors such as cadmium-telluride (CdTe) or cadmium-zinc-telluride (CZT), as opposed to the EID method of converting visible light into an electrical signal using a conventional scintillator. Moreover, PCCT is capable of detecting photon energy on an individual basis, thereby facilitating the attainment of exceedingly high spatial resolution, enhanced spatial resolution, diminished noise, and quantitative material analysis information devoid of electrical noise in medical imaging. These developments have facilitated significant advancements in medical imaging, particularly in the visualization of coronary arteries, where conventional CT encounters challenges due to calcification, and in low-dose imaging of obese patients, where noise in the image can be diagnostically confusing. Furthermore, they have enabled the provision of specific information for diagnostic imaging of underlying patient conditions such as interstitial lung disease and multiple myeloma. Consequently, this paper will elucidate the technical and diagnostic reliability, as well as the clinical applications, of PCCT, which optimizes spectral imaging for the visualization of small structures and lesions with greater clarity.

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