A CT scan of the head typically includes the brain, eyes, ears, and the skull. But, depending on the reason for the scan, it might also include the upper neck. It's like when you're taking a selfie, and you want to include your favorite necklace - you need to frame the shot just right.
The radiologist will decide how much of the neck to include in the scan, based on what they're looking for. It's a bit like being a detective, searching for clues - they need to look at the right areas to solve the mystery. And, just like a detective, they might need to look at the neck to get the full picture.
