Abstract
AbstractSince the introduction of multi-modality imaging, i.e. Positron Emission Tomography-CT (PET-CT) and Single Photon Emission Computed Tomography-CT (SPECT-CT), the number of studies in Nuclear Medicine has grown tremendously. The previous chapter has discussed dose assessment from the radiation emitted by radionuclides in Nuclear Medicine. Computed Tomography (CT) has its inherent property of imparting radiation to the patient. The amount of radiation released by CT machines is significantly higher than the conventional diagnostic Nuclear Medicine procedures. Considering the radiation safety of patients, it becomes very important to discuss dose assessment from the CT component in a radiation safety book. CT dose is entirely different from the radiation doses imparted by radionuclides in nuclear medicine, and so are the dose assessment method and terms. The chapter is designed to cater to needs of Nuclear Medicine Professionals. It explains how the CT machine works, various terms used for CT dose assessment, calculation of effective doses from CT dose reports generated from machines during the scan, diagnostic reference levels and achievable doses.
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