| Summary: | The aim of this study is to evaluate the suitability of crystalline scintillator LaCl<sub>3</sub>:Ce for possible use in hybrid medical imaging systems, such as PET/CT and SPECT/CT scanners. For this purpose, a single crystal (10 × 10 × 10 mm<sup>3</sup>) was irradiated by X-rays within the tube voltage range from 50 to 150 kVp, and the absolute efficiency (AE) was measured experimentally. The energy absorption efficiency (EAE), quantum detection efficiency (QDE), and the spectral compatibility with various optical detectors were also calculated with the use of mathematical formulas. The results were compared with published data for Bi<sub>4</sub>Ge<sub>3</sub>O<sub>12</sub> (BGO), Lu<sub>2</sub>SiO<sub>5</sub>:Ce (LSO), and CdWO<sub>4</sub> single crystals of equal dimensions, commonly used in medical imaging applications. The luminescence efficiency values of the examined crystal were found to be higher than those of LSO, BGO, and CdWO<sub>4</sub> crystals, within the whole X-ray tube voltage range. In the matter of EAE, LaCl<sub>3</sub>:Ce demonstrated reduced performance with respect to LSO and CdWO<sub>4</sub> crystals. The emission spectrum of LaCl<sub>3</sub>:Ce was found to be compatible with various types of photocathodes and silicon photomultipliers (SiPMs). Considering these properties, LaCl<sub>3</sub>:Ce crystal could be considered suitable for use in hybrid medical imaging systems.
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