What is the typical frequency range for a transvaginal probe?

• A. 3.5 MHz
• B. 5 MHz
• C. 7.5 MHz
• D. 10 MHz

Answer: (C)

The typical frequency range for a transvaginal probe is around 7.5 MHz. This frequency is optimal for producing high-resolution images of the pelvic organs, including the uterus and ovaries, as well as for evaluating early pregnancies. The higher frequency allows for improved detail and clarity in imaging due to the shorter wavelength, which enhances the ability to visualize small structures in close proximity, such as the endometrium and other reproductive tissues.

Using a frequency of 7.5 MHz strikes a balance between depth of penetration and image resolution, making it particularly effective for gynecological assessments. Frequencies lower than this may penetrate deeper but do not provide the same level of detail, whereas frequencies higher than 7.5 MHz could yield sharper images but might limit the depth of penetration too much for certain clinical applications.