A planning and navigation system, comprising: a planning system including: a memory configured to store a plurality of images; and a first controller configured to render the plurality of images in three dimensions, segment the plurality of images to demarcate a target area, and automatically determine a treatment plan based on the target area; and a navigation system including: an ultrasound device configured to obtain an ultrasound image in a scan plane; a surgical device; and a second controller configured to receive the ultrasound image and the fiducial image, wherein the second controller is configured to determine a position of the surgical device in relation to the scan plane based on the fiducial image; a third controller configured to receive the rendered plurality of images, the target area, the treatment plan, the ultrasound image, and the position of the surgical device in relation to the scan plane; and a display, wherein the display and the third controller are configured to display a first display having the rendered plurality of images, the target area, and the treatment plan characterised in that the ultrasound device has a fiducial pattern disposed thereon; the surgical device has an image capture device configured to capture a fiducial image of the fiducial pattern; and the display and the third controller are configured to display a second display having the ultrasound image, a virtual image of the surgical device based on the position of the surgical device in relation to the scan plane, and the treatment plan. a planning system including: a memory configured to store a plurality of images; and a first controller configured to render the plurality of images in three dimensions, segment the plurality of images to demarcate a target area, and automatically determine a treatment plan based on the target area; and a memory configured to store a plurality of images; and a first controller configured to render the plurality of images in three dimensions, segment the plurality of images to demarcate a target area, and automatically determine a treatment plan based on the target area; and a navigation system including: an ultrasound device configured to obtain an ultrasound image in a scan plane; a surgical device; and a second controller configured to receive the ultrasound image and the fiducial image, wherein the second controller is configured to determine a position of the surgical device in relation to the scan plane based on the fiducial image; an ultrasound device configured to obtain an ultrasound image in a scan plane; a surgical device; and a second controller configured to receive the ultrasound image and the fiducial image, wherein the second controller is configured to determine a position of the surgical device in relation to the scan plane based on the fiducial image; a third controller configured to receive the rendered plurality of images, the target area, the treatment plan, the ultrasound image, and the position of the surgical device in relation to the scan plane; and a display, wherein the display and the third controller are configured to display a first display having the rendered plurality of images, the target area, and the treatment plan characterised in that the ultrasound device has a fiducial pattern disposed thereon; the surgical device has an image capture device configured to capture a fiducial image of the fiducial pattern; and the display and the third controller are configured to display a second display having the ultrasound image, a virtual image of the surgical device based on the position of the surgical device in relation to the scan plane, and the treatment plan.