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    • 69. 发明授权
    • Frequency controlled hybrid ultrasonic imaging arrays
    • 频率混合超声波成像阵列
    • US4446740A
    • 1984-05-08
    • US356467
    • 1982-03-09
    • David A. WilsonJames L. BuxtonPhilip S. Green
    • David A. WilsonJames L. BuxtonPhilip S. Green
    • G01S7/52G01S15/89G01N29/00
    • G01S7/52085G01S15/8918G01S7/52046G01S7/5206
    • This ultrasonic imaging apparatus has an array (44, 52 or 100) of transducer elements (44, 50 or 104) for transmitting ultrasonic signals having a first predetermined center frequency (fc1) into an object (12) to be analyzed through use of the transmitted signals reflected from within the object. A means (150, 116-1 through 116-X and 120-1 through 120-X) is connected to transmit the ultrasonic signals from the array (44, 52 or 104) in a stepped array mode. A means (150, 116-1 through 116-X and 120-1 through 120-X) is connected to transmit the ultrasonic signals from the array (44, 52 or 104) in an angle scanning mode. There is a means (150, 128-1 through 128-X) for focusing the transmitted signals at a desired depth within the object (12). The reflected signals sensed by the apparatus have a second center frequency (fc2) less than the first center frequency (fc1) as a result of signal attenuation by the object (12). There is a means connected to select between the stepped array transmission mode and the angle scanning transmission mode for operating the array elements based on the second center frequency (fc2). Varying the operating mode of the apparatus on this basis gives improved image resolution over a wider operating range than with prior art systems.
    • 该超声波成像装置具有用于将具有第一预定中心频率(fc1)的超声波信号发送到待分析的物体(12)的换能器元件(44,50或104)的阵列(44,452或100) 从物体内反射的发射信号。 连接装置(150,116-1至116-X和120-1至120-X)以分阶阵列模式从阵列(44,452或104)传送超声波信号。 连接装置(150,116-1至116-X和120-1至120-X)以角度扫描模式从阵列(44,452或104)传送超声波信号。 存在用于将所发送的信号聚焦在物体(12)内的期望深度的装置(150,128-1至128-X)。 作为由物体(12)的信号衰减的结果,由装置感测到的反射信号具有小于第一中心频率(fc1)的第二中心频率(fc2)。 连接有用于基于第二中心频率(fc2)在步进阵列传输模式和用于操作阵列元件的角度扫描传输模式之间进行选择的装置。 在此基础上改变设备的操作模式在现有技术的系统中,在更宽的操作范围内提供了改进的图像分辨率。
    • 70. 发明授权
    • Frequency varied ultrasonic imaging array
    • 频率变化超声波成像阵列
    • US4442713A
    • 1984-04-17
    • US356498
    • 1982-03-09
    • David A. WilsonJames L. Buxton
    • David A. WilsonJames L. Buxton
    • A61B8/00G01N29/04G01S7/52G01S15/89G10K11/34G01N29/00
    • G10K11/341G01S15/8954G01S7/52046
    • An ultrasonic imaging apparatus has an array (10 or 100) of transducer elements (14 or 104) for transmitting ultrasonic signals into an object (12) to be analyzed through use of the transmitted signals reflected from the object and sensed by the apparatus. The transmitted signals have a first predetermined center frequency. The reflected signals sensed by the apparatus have a second center frequency less than the first center frequency as a result of signal attenuation by the object. A means (70, 62 or 150, 152-1 through 152-X) is connected to select a number of transducers (14 or 104) in the array (10 or 100) for transmitting and/or receiving the ultrasonic signals based on the second center frequency. Adjusting the number of transmitting and/or receiving transducers (14 or 104) with changes in frequency produced by signal attenuation gives improved image resolution under a wider variety of use conditions than with prior art ultrasonic imaging apparatus.
    • 超声波成像设备具有用于通过使用从物体反射并由设备感测的发射信号将超声波信号发射到物体(12)中的换能器元件(14或104)的阵列(10或100)。 所发送的信号具有第一预定中心频率。 该装置感测到的反射信号由于物体的信号衰减而具有小于第一中心频率的第二中心频率。 连接装置(70,62或150,152-1至152-X)以选择阵列(10或100)中的多个换能器(14或104),用于基于所述阵列(10或100)发送和/或接收超声波信号 第二中心频率。 通过信号衰减产生的频率变化来调节发射和/或接收换能器(14或104)的数量,可以在现有技术的超声波成像装置的各种使用条件下提高图像分辨率。