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A method of adjusting an ablation field radiating into tissue includes the initial step of providing a handheld device including a phased antenna array and an ultrasound transducer array. The method includes the steps of positioning a tissue-contact surface of the handheld device adjacent to tissue,

A method of adjusting an ablation field radiating into tissue includes the initial step of providing a handheld device including a phased antenna array and an ultrasound transducer array. The method includes the steps of positioning a tissue-contact surface of the handheld device adjacent to tissue, activating the phased antenna array to deliver energy through the tissue-contact surface to generate an ablation field in targeted tissue, activating the ultrasound transducer array to acquire ultrasound image data representative of the targeted tissue during energy delivery into the targeted tissue by the phased antenna array, and selectively steering the focal point of energy delivery in tissue to adjust the ablation field radiating into tissue.

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1. A method of adjusting an ablation field radiating into tissue, comprising the steps of: positioning a tissue-contact surface of a medical device adjacent to tissue, the medical device including a phased antenna array and an ultrasound transducer array;delivering energy from the phased antenna arr

1. A method of adjusting an ablation field radiating into tissue, comprising the steps of: positioning a tissue-contact surface of a medical device adjacent to tissue, the medical device including a phased antenna array and an ultrasound transducer array;delivering energy from the phased antenna array through the tissue-contact surface to generate an ablation field in tissue;displaying ultrasound images using data acquired from the ultrasound transducer array representative of a tissue region during energy delivery into the tissue region by the phased antenna array; andadjusting the ablation field radiating into tissue by electronically steering the radiated beam of the phased antenna array based on the ultrasound images. 2. The method of adjusting an ablation field radiating into tissue of claim 1, wherein the step of displaying ultrasound images includes the steps of: providing at least one screen suitable for displaying images; anddisplaying the ultrasound images on the at least one screen. 3. The method of adjusting an ablation field radiating into tissue of claim 2, wherein the step of displaying ultrasound images further includes the steps of: outputting data acquired by the ultrasound transducer array to an ultrasound imaging system; andoutputting ultrasound images from the ultrasound imaging system to at least one screen. 4. The method of adjusting an ablation field radiating into tissue of claim 1, wherein the phased antenna array is operably coupled to an electrosurgical power generating source. 5. The method of adjusting an ablation field radiating into tissue of claim 4, wherein the phased antenna array includes a plurality of radiating elements. 6. The method of adjusting an ablation field radiating into tissue of claim 5, wherein the phased antenna array is operably coupled to a user-interface and a processor unit, wherein the user-interface includes a pointing device. 7. The method of adjusting an ablation field radiating into tissue of claim 6, wherein the step of adjusting the ablation field radiating into tissue by selectively steering the radiated beam of the phased antenna array includes the steps of: using at least one electrical signal outputted from the user-interface responsive to a user-effected movement of the pointing device, received by the processor unit, to determine phasing of the plurality of radiating elements. 8. A method of adjusting an ablation field radiating into tissue, comprising the steps of: providing a handheld device including a phased antenna array and an ultrasound transducer array;positioning a tissue-contact surface of the handheld device adjacent to tissue;activating the phased antenna array to deliver energy through the tissue-contact surface to generate an ablation field in tissue;activating the ultrasound transducer array to acquire ultrasound image data representative of a tissue region during energy delivery into the tissue region by the phased antenna array; andelectronically steering the focal point of energy delivery in tissue to adjust the ablation field radiating into tissue based on the ultrasound images. 9. The method of adjusting an ablation field radiating into tissue of claim 8, wherein the tissue-contact surface includes a first region defining an ultrasound transmissive window. 10. The method of adjusting an ablation field radiating into tissue of claim 9, wherein the ultrasound transducer array is operatively associated with the ultrasound transmissive window. 11. The method of adjusting an ablation field radiating into tissue of claim 1, wherein the step of activating the ultrasound transducer array includes the steps of: directing ultrasound energy through the ultrasound transmissive window; andreceiving ultrasound energy through the ultrasound transmissive window. 12. The method of adjusting an ablation field radiating into tissue of claim 9, wherein the tissue-contact surface further includes a second region defining a microwave transmissive window. 13. The method of adjusting an ablation field radiating into tissue of claim 12, wherein the phased antenna array is operatively associated with the microwave transmissive window.