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13- (2pts) Which of the following imaging modalities can be used for guiding HIFU procedures? Elastography Magnetic Resonance Imaging Computed Tomography Ultrasound, using a high power ultrasound transducer None, image-guidance is not necessary neuoo 14- (2pts) Which of the following factors can be source of noise or errors in Doppler images? aliasing uncertainties in the angle between the ultrasound signal and the direction of the red blood cells a transmitting pulse having a wide frequency bandwidth a transmitting pulse having a wide beamwidth dUD 15- (2pts) Ultrasound elastography: is used to obtain information about tissue stiffness can be used to image cancers requires the tissue to be compressed will replace B-mode imaging in a number of applications devo