Title:
超音波ビーム形成装置
Document Type and Number:
Japanese Patent JP4039643
Kind Code:
B2
Abstract:
A phased array sector scanning ultrasonic system includes a separate receive channel for each respective element in an ultrasonic transducer array. Each receive channel imparts a delay to the echo signal produced by each respective element. The delayed echo signals are summed to form a steered, dynamically focused and dynamically windowed receive beam even when the transmit beam does not emanate from the center of the array. The receiver has a beamformer including a multiplicity of beamformer channels. The beamformer dynamically increases delays to each channel without introducing unwanted discontinuities, by combining and synchronizing a FIFO and an interpolator. The interpolator uses "Wallace tree" adders to accumulate bit-shifted versions of the inputs. The number of additions is less than the number of bits which would be needed to represent equivalent coefficients. This reduces the hardware relative to a conventional implementation which incorporates multipliers with shifts and adds equaling the number of bits in the coefficients.
Inventors:
Stephen Sea Miller
Gregory A. Relegard
Daniel Sea Millon
Gregory A. Relegard
Daniel Sea Millon
Application Number:
JP36049697A
Publication Date:
January 30, 2008
Filing Date:
December 26, 1997
Export Citation:
Assignee:
GENERAL ELECTRIC COMPANY
International Classes:
G01N29/44; G01S7/523; A61B8/00; G01S15/89; G10K11/34; H04R17/00; G01S7/52
Domestic Patent References:
| JP7051266A | ||||
| JP4109941A | ||||
| JP5317310A | ||||
| JP3123879A | ||||
| JP9318733A |
Foreign References:
| US5191546 | ||||
| US5345939 |
Attorney, Agent or Firm:
Kenichi Matsumoto