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For several decades, the development of X-ray detectors has been largely dependent on materials such as cesium iodide for scintillation indirect conversion detectors, amorphous selenium for direct detectors. These have been deployed for a wide range of applications including medical imaging, non-destructive testing, security screening among many others. Recently, metal halide perovskites in various dimensionalities (based on quantum confinement effects) has gained attention for optoelectronic applications such as photovoltaics, light emitting diodes and sensors. The high atomic number of these metal halide perovskites also make them strong attenuators for high energy X-rays. As a result, there has been a growing interest on the development of metal halide perovskites for X-ray detection and imaging applications. In this chapter, we focus on the key developments that have taken place in using metal halide perovskites as direct conversion or indirection conversion systems for dosimetry and X-ray imaging. The discussion focuses on materials growth or synthesis aspects includes the growth and utilization of perovskite single crystals and polycrystalline materials as well as its two and zero dimensional forms and their implementation as well as the key detector metrics that have been reported. We also discuss the key challenges in each of the above detector types. Finally, we discuss key areas that should be investigated in more detail and carefully developed over the coming years including the growth of high-quality material and concerns on material toxicity.