## Core Concept
Non-contrast CT scans are a critical diagnostic tool in the initial assessment of head injuries. They are particularly useful for detecting acute hemorrhages, bone fractures, and other immediate complications. The primary purpose is to quickly identify life-threatening conditions that require urgent intervention.

## Why the Correct Answer is Right
The correct answer, although not directly provided, relates to the limitations or specific characteristics of non-contrast CT scans in head injury assessment. Typically, non-contrast CT scans are excellent for detecting acute bleeds due to the high density of fresh blood. However, they might not be as sensitive for certain types of injuries, such as diffuse axonal injuries or some types of brain edema, especially in the early stages.

## Why Each Wrong Option is Incorrect
- **Option A:** Without the specific details of option A, we can infer that if it states a recognized benefit or capability of non-contrast CT scans in head injuries (e.g., quickly identifying acute hemorrhages), it would be a correct statement and thus not the answer.
- **Option B:** Similarly, if option B describes another valid use or advantage of non-contrast CT scans (e.g., detection of bone fractures, assessment of ventricular size), it would not be the correct answer.
- **Option C:** If option C mentions a limitation or a scenario where non-contrast CT might not be ideal (e.g., detecting ischemic changes early, subtle brain injuries), it could potentially be correct but depends on the specifics.
- **Option D:** This option is stated as the correct answer but without content, we infer it represents a statement that is not true about non-contrast CT scans.

## Clinical Pearl / High-Yield Fact
A key point to remember is that non-contrast CT scans are the initial imaging modality of choice in acute head trauma due to their speed, wide availability, and sensitivity for acute blood. However, in certain cases, such as suspected cervical spine injury, the entire spine should be imaged, and in some brain injuries, follow-up imaging with MRI or contrast-enhanced CT may be necessary for better characterization.

## Correct Answer: D.