Which statement is TRUE about the ICA spectrum?

The ICA (Internal Carotid Artery) spectrum is primarily characterized by elevated diastolic flow and a less distinct peak. This is typical in healthy ICA waveforms, where there is a significant amount of continuous diastolic flow, reflecting the low resistance of the vascular bed supplied by the ICA. Elevated diastolic flow indicates good perfusion to the brain, and the waveform's peak is less distinct because it reflects the flow dynamics influenced by the brain's constant demand for blood supply.

In contrast, high-resistance waveforms are often associated with arteries supplying muscles or tissues that require less continuous blood flow, resulting in a sharper systolic peak and reduced diastolic flow. Therefore, the description of the ICA spectrum aligns well with its physiological role and the nature of blood supply to the brain, reinforcing why the statement about elevated diastolic flow and a less distinct peak is true.