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7th generation 6th generation 5th generation advancement in ct flate panel dual source ct ebct axial ct mdct multislice ct helical ct 4th generation 3rd genetaion 2nd generation 1st generation the next future for tomosynthesis physical characteristics of dbt tomosynthesis images 3d breast imaging dbt thi safety disadvantages of thi advantages of thi pulse-coded harmonics side-by-side phase cancellation pulse inversion bandwidth receive filtering subharmonic frequencies ultraharmonic frequencies the second harmonic fundamental frequency new grayscale imaging technique ³Ù³óị resolution image optimization nasolacrimal duct parotid gland submandibular glands sub lingual glands anatomy tears salivary gland imaging anatomy of the salivary glands