Biplane endorectal and endovaginal probes are commonly used in obstetrics, gynecology and urology. They are generally composed of 2 arrays one linear for imaging of the longitudinal plane and a highly curved one to image the transverse plane. These two planes allow a perpendicular visualization of the region of interest.
Ultrasound imaging in both transverse and longitudinal planes enables e.g., precise multiple biopsies by simultaneous visualization of both planes in real-time.

A vaginal probe is a small ultrasound transducer (e.g. a biplane probe) that is inserted directly into the vagina. A sterile cover is slipped over the handheld transducer (also handle or probe), which is then covered with lubricating gel and placed in the vagina.
This technique produces a sharp image, not only because of the close proximity to the uterus, but also because this transducer is more sensitive.

After each examination, probes used on the skin surface should be cleaned with soap and water or quaternary ammonium sprays or wipes as directed by the manufacturer. Additional cleansing may be necessary in cases of blood or other contamination.

The array of elements of microconvex probe is curved with a certain radius. Microconvex probes have a much smaller contact surface, which improves the coupling between the transducer and the skin surface even in complicated areas as the supraclavicular or jugular fossa. Microconvex probes, with large aperture and selection of transmission frequencies are also used in gynecological diagnostic.

See also Transvaginal Echography, Endocavitary Echography and Transrectal Ultrasonography.

A tri-frequency probe emits three different frequencies. Probes with tri-frequency capabilities allow a wide range of scanning applications from a single probe.

See also Multi-Frequency Probe and Dual Frequency Phased Array Transducer.