How does MSAD change when slices overlap in CT scanning?

When slices overlap in CT scanning, the multiple-slice acquisition leads to an increase in the Mean Skin Dose (MSAD). Overlapping slices imply that the same volume of tissue is irradiated multiple times, which can lead to a higher cumulative dose for the patient. The MSAD accounts for the dose received in overlapping slices as it takes into consideration the depth of tissue being irradiated and how much of that tissue is irradiated multiple times.

In essence, with each additional overlapping slice, there is an increase in the radiation exposure and therefore the MSAD rises. This understanding emphasizes the importance of optimizing scan protocols to minimize unnecessary radiation exposure while still achieving diagnostic image quality. Reducing overlap can help maintain a lower MSAD, thus ensuring patient safety and adherence to radiation dose management principles.