What transducer frequency is typically used for cerebrovascular assessment with transcranial Doppler?

In cerebrovascular assessment using transcranial Doppler ultrasound, a transducer frequency of 2 MHz is commonly utilized. This frequency strikes an effective balance between depth of penetration and resolution. The objective of transcranial Doppler is to evaluate blood flow velocities in major cerebral arteries, including the middle cerebral artery, anterior cerebral artery, and posterior cerebral artery.

At 2 MHz, the transducer can adequately penetrate the cranial bone to reach the vessels of interest while providing sufficient resolution to detect the flow characteristics. Higher frequencies might enhance image quality but are less capable of penetrating bone effectively, making them unsuitable for this type of examination. Conversely, lower frequencies may not provide the resolution necessary for accurate velocity measurements, which are crucial in diagnosing conditions such as stenosis or embolisms in cerebral circulation.

Using a 2 MHz transducer frequency enables optimal visualization of cerebral blood flow, allowing for accurate assessment and effective management of cerebrovascular disorders.