6–114 mm (Fig. 6.13 ) as further described in the instrumentations and techniques chapter. However, it is possible to use any curved-array transducer with frequencies of 3.5–8 MHz [ 13 , 14 ]. These probes are readily available in any urologist’s or gynecologist’s offi ce and offer a good introduction to dynamic pelvic fl oor imag­ing. Depending on the setting of the machine, the image may be upside down on the machine, and most machines have the capability to display the image as if the patient is standing with the left sagittal plane in view (Fig. 6.13 ). The transducer is covered with ultrasound gel and covered with a glove, a plastic wrap, or a cover. The pubic sym­physis will be on the bottom right of the screen and the levator plate should be visualized on the lower left. During the examination, dynamic imaging is obtained by asking the patient to per­form a Valsalva maneuver. It is important, when performing TLUS or TPUS, to avoid excessive pressure on the perineum or inappropriate angle of the transducer (and thus the ultrasound beam) to the anal canal. For more information on trans­perineal imaging, please refer to the chapter dedi­cated to this topic.