Hybrid Imaging Virtual Workshop (02 25)-CT Physics 101

Video Transcription

Video Summary

In this video, Ian Armstrong, a consultant medical physicist, provides an overview of CT physics and its application in nuclear cardiology. He starts by explaining how x-rays are produced in a CT tube and how they are used to create an energy spectrum. He then discusses the acquisition and reconstruction parameters that can be changed to optimize image quality and reduce radiation dose. Armstrong goes on to explain how CT dose is calculated, including the CT dose index and the dose length product. He emphasizes the importance of accurate measurements and highlights the use of tube current modulation to reduce patient dose. In terms of attenuation correction, he discusses the process of generating an attenuation map from a CT image and its importance in SPECT and PET hybrid imaging. Finally, Armstrong explains the concept of calcium scoring and discusses the impact of image reconstruction on calcium scores. He highlights the need for accurate measurements and notes the potential for low-dose CT and ECG-gated acquisitions in calcium scoring. Overall, the video provides a comprehensive overview of CT physics and its applications in nuclear cardiology.

Keywords

CT physics

nuclear cardiology

x-rays

radiation dose

attenuation correction

calcium scoring

image reconstruction