1. A method of treating tissue in a treatment region with a HIFU Treatment, the method comprising the steps of: initiating a HIFU Therapy to treat a portion of the tissue with an ultrasound transducer; obtaining an image of the treatment region subsequent to attempting to treat the portion of the tissue with HIFU Therapy; extracting a sub-image from the image, the sub-image being at least a portion of the image; producing a line image that displays an average of intensity values of pixels in the sub-image, the line image providing an averaged intensity value as a function of time; automatically detecting an acoustic obstruction proximate to the ultrasound transducer by analyzing the line image for a repetitive pattern, and determining the presence of the acoustic obstruction based on the presence of the repetitive pattern in the portion of the image; and pausing the HIFU Treatment.