An ultrasonic apparatus (10) includes a support (2) for accommodating a portion of a patient (14). The support includes a first reservoir (8) with a transmission medium. The support further includes an ultrasonic wave source (9) having an emitting surface (7) being conceived to be oriented towards the portion of the patient (14) in use. The ultrasonic apparatus further includes a substantially transparent aperture (26) arranged in the support (2) for enabling an inspection of the first reservoir. A therapeutic system increases a workflow of the ultrasonic apparatus.