III.A.8. Assume that a scan of one CT slice produces an average dose of 3 rad to the tissue in the slice. If 10 contiguous slices are scanned with the same factors:
a. The average dose to the tissue within the slice will increase by at least a factor of 10. No
b. The integral dose (imparted energy) will increase by at least a factor of 10. Yes
c. The risk to the patient will be increased. Yes
d. Scattered radiation contributes to the dose. Yes
Discussion: The dose to a previously scanned slice does not increase in proportion to the number of additional contiguous slices. There will be some scatter contribution (perhaps 10-20%) to adjacent slices.
Reference: Physical Principles of Medical Imaging, 2nd Edition. p. 48