What is the optimal frequency range used for transabdominal ultrasound during liver imaging?

The frequency range of 2 to 5 MHz is optimal for transabdominal ultrasound during liver imaging due to several factors related to the balance between image resolution and penetration depth. In transabdominal imaging, particularly for structures like the liver, the ultrasound needs to penetrate through the abdominal wall and fat.

Frequencies in this range provide sufficient penetration to visualize deep structures while still offering reasonable image resolution. This is crucial for effectively assessing liver size, texture, and identifying potential lesions or abnormalities.

Higher frequencies, such as those in the range of 5 to 10 MHz or 10 to 15 MHz, while capable of producing superior image resolution, can lack penetration capability for deeper structures, making them less effective for transabdominal applications. Conversely, frequencies lower than 2 MHz may penetrate better but compromise detail, which is essential for detailed liver imaging.