Question

Which of the following is NOT a reason for using thinner slices in the posterior fossa compared with the more superior regions of the brain?

1. to reduce streak artifacts
2. to improve spatial resolution
3. to decrease radiation dose to the patient

Answer 1

Using thinner slices in the posterior fossa improves spatial resolution and reduces streak artifacts. The incorrect option is that it decreases radiation dose to the patient, as reducing slice thickness is not a method used for dose reduction.

Step-by-step explanation:

The question is focused on the technical consideration of medical imaging, specifically the use of thinner imaging slices in the posterior fossa of the brain. Using thinner slices in this region is mainly to improve spatial resolution and to reduce streak artifacts associated with the complex bony structures located in this area. Among the options presented, the incorrect reason for using thinner slices in the posterior fossa is to decrease radiation dose to the patient. Employing isotopes with short half-lives in medical imaging is one method to limit the radiation dose; this is because isotopes with short half-lives degrade more quickly, meaning they release their radiation over a shorter time frame, thus exposing the patient to radiation for a shorter period.