Ultrasound diagnostic apparatus
AssigneeFUJIFILM Corporation
InventorsTakehiro Shimono, Takahide Terada
Life of this patent
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Abstract
A passband characteristic of a band pass filter is adapted to an examinee while a texture of an ultrasound image is maintained or is not significantly changed. A passband characteristic of a BPF is dynamically changed in accordance with a depth of an observation point (reception focus). The passband characteristic includes convex forms, and the convex forms have peaks as highest points in a gain axis direction and have widths in a frequency axis direction. A peak position is relatively changed with respect to the width while an upper limit and a lower limit of the width are substantially maintained. Accordingly, the convex forms are biased to a low-frequency side or a high-frequency side.
Claims6
An ultrasound diagnostic apparatus comprising:
- a transducer that transmits ultrasound to an inside of an examinee, receives a reflected wave from the inside of the examinee, and outputs a reception signal which is an electronic signal;
- a band pass filter through which the reception signal, which is an electronic signal and is output from the transducer, passes;
- a former that has a processor to form an ultrasound image based on the reception signal output from the band pass filter;
- and
- a controller that dynamically changes a passband characteristic of the band pass filter in accordance with an increase in an observation point depth in the examinee,
- wherein the passband characteristic of the band pass filter through which the electronic reception signal passes has a convex form, and the convex form has a peak as a highest point in a gain axis direction, and a width in a frequency axis direction, and the controller changes a peak position with respect to the width in accordance with the examinee at at least one observation point depth, and
- an upper limit and a lower limit of the width at the at least one observation point depth are substantially maintained in a case in which the peak position is changed with respect to the width.
Dependencies are inferred from the claim text.