Question

Regarding the dose in single-slice versus multi-slice scanners: 

a. Dose is independent of the slice width in a single-slice scanner 

b. In a single-slice scanner, if mA remains constant, then the thicker the slice width, the lower the dose 

c. In a helical scanner, the field of view affects the dose directly 

d. Post-patient collimation can reduce the dose in a single-slice scanner 

e. The dose is higher in a helical compared with an axial scanner 

Answer 1

a. True. 

b. False. Slice thickness does not affect the dose if mA remains the same; it means that the noise is higher. 

c. False. Neither reconstruction nor the field of view affect the dose directly. They do influence the noise and subsequently the mA. 

d. False. Post-patient collimation increases the patient’s dose. 

e. True.