Final answer:
Ejection fraction analysis in CT imaging is a measure of heart function and blood flow, expressed as a percentage of blood ejected from the heart with each beat, and aids in the diagnosis of heart diseases.
Step-by-step explanation:
Ejection fraction analysis in CT (computed tomography) is primarily used to assess heart function and blood flow. This measurement represents the percentage of blood that is ejected from the heart during each heartbeat. The ejection fraction is calculated by dividing the stroke volume (SV) by the end-diastolic volume (EDV) and is expressed as a percentage, typically ranging from 55-70 percent, with an average of 58 percent.
CT imaging can provide detailed static images that are useful to evaluate the size and characteristics of heart structures, thus aiding in the calculation of the ejection fraction. Furthermore, PET (positron emission tomography) scans, which can be complementary to CT, are instrumental in assessing physiological activities such as nutrient metabolism and blood flow, improving the diagnosis of heart diseases.