Patent ID: 8574166

Claim:
Apparatus for detecting thermal radiation emanating from two different intracranial depths in a patient, said apparatus comprising a dual-mode transducer having a working surface for placement against a patient's cranium, said transducer including a first antenna extending along an axis to a first end at or adjacent to said working surface, said first antenna having a characteristic first antenna pattern that extends a selected first distance from said working surface and being tuned to a first frequency, said first antenna producing a first output signal indicative of thermal radiation received within said first antenna pattern, and a second antenna extending along said axis within the first antenna to a second end adjacent to said working surface, said second antenna being isolated from said first antenna and having a characteristic second antenna pattern that extends a selected second distance from said working surface within the envelope of the first antenna pattern and being tuned to a second frequency, said second antenna producing a second output signal indicative of thermal radiation received within said second antenna pattern, said second distance being appreciably shorter than said first distance.